CN118236288A - Sun-proof skin care product and preparation method thereof - Google Patents

Abstract

The invention discloses a sun-proof skin care product and a preparation method thereof, wherein the preparation method comprises the following steps: mixing choline chloride and lactic acid to prepare a eutectic solvent; mixing longan shell powder with eutectic solvent, stirring, cooling, centrifuging and the like; washing the residue with absolute ethyl alcohol, and evaporating the obtained filtrate to obtain a concentrated solution; mixing the supernatant and the concentrated solution, adding deionized water, stirring, standing, centrifuging to separate out solid precipitate, and oven drying to obtain longan shell lignin; respectively dispersing longan shell lignin and sodium alginate in deionized water, and uniformly stirring to obtain a longan shell lignin solution and a sodium alginate solution; mixing the longan shell lignin solution, the sodium alginate solution and the natural plant essential oil to obtain longan shell lignin composite sun-screening particles; finally, preparing the sun-proof skin care product with a thickening agent, a humectant and a plant extract; the invention reasonably utilizes waste resources of longan industry, and the product is green and natural, high in safety and remarkable in effect.

Description

Sunscreen skin care product and preparation method thereof

Technical Field

The invention belongs to the field of cosmetics, and in particular relates to a sunscreen skin care product and a preparation method thereof.

Background technique

Longan, also known as longan, round eye, and intelligence, is a species of the genus Dimocarpus longan Lour. of the Sapindaceae family. In addition, it is also commonly cultivated in southern and southeastern Asia.

The fruit of longan is extremely nutritious and is considered a precious high-end tonic. Its medicinal value is recorded in the "Shennong Bencao Jing". It is warm in nature and sweet in taste. It has the effects of nourishing the heart and spleen, nourishing blood and calming the mind. Longan can play a good therapeutic effect on symptoms such as insufficient qi and blood, palpitations, forgetfulness and insomnia, and chlorosis due to blood deficiency. For middle-aged and elderly patients with weakness, hypertension, hyperlipidemia and coronary heart disease, longan is regarded as an ideal tonic.

In the Compendium of Materia Medica, longan is praised as "the most valuable food is lychee, and the best health product is longan", and it is pointed out that its flesh has the effect of "appetizing, strengthening the spleen, replenishing deficiency and improving intelligence". Its warm nature and sweet taste make it the first choice for replenishing the heart and spleen, nourishing blood and calming the mind.

Longan is not only a good fruit for fresh consumption, but can also be processed into canned food, dried products or longan paste. In recent years, the national longan planting area has stabilized at 4.5 million mu, with an annual output of nearly 2 million tons. Globally, my country has the largest longan cultivation area and the largest output, accounting for about 59% of the global total output.

However, the global consumption market for fresh longan and its processed products is mainly concentrated in Asian countries and regions, with my country having the largest consumption. In recent years, my country's longan consumption has exceeded 2.2 million tons, of which 80% is fresh. In addition, processed products such as dried longan, longan meat, canned longan and longan fruit wine are also popular among consumers. Although my country's longan production is relatively high, it still cannot meet all consumer demand, and part of the consumption needs to be supplemented by imports.

With the development of the longan industry, the amount of discarded skins, cores, branches and leaves and other by-products has increased year by year, which not only puts pressure on the environment, but also wastes resources. At present, the sunscreen products on the market are mainly divided into three categories: physical sunscreen products, chemical sunscreen products and biological sunscreen products. Among them, physical sunscreen products (containing physical sunscreens) mainly block ultraviolet rays through the principles of reflection and scattering. The advantages are stability, low irritation and low allergenicity. The disadvantages are white color, unnatural finishing effect, airtightness, heavy texture, unsuitable for oily skin, easy clogging of pores and acne; chemical sunscreen products (containing chemical sunscreens) decompose ultraviolet rays through light-transmitting chemical ingredients. The advantage is that the texture is refreshing and not greasy. The disadvantage is that it is somewhat irritating, and because the chemical ingredients generally deteriorate within 4 hours, they need to be reapplied after a certain period of time. Pregnant women should try to avoid it; while biological sunscreen products (containing natural sunscreen ingredients) use biologically active substances to repair the oxidative stress response produced after ultraviolet irradiation, block and slow down tissue damage, promote post-sun repair, and play an indirect sunscreen role. The advantages are low skin irritation, good product fit and high comfort. The disadvantage is high price. However, these sunscreen products have their advantages and disadvantages, especially for the third type of biological sunscreen products, which are not easily accepted by the public due to their high prices.

Lignin is an aromatic polymer that exists in plants and provides them with sufficient strength and hardness. Due to its unique phenylpropane unit, a large number of phenolic hydroxyl groups and other functional group structures, lignin has excellent UV protection and antioxidant properties. In longan shells, the content of lignin is about 30%-40%. Lignin extracted from longan shells can be combined with natural sunscreens to prepare composite sunscreen particles for use in sunscreen skin care products. This application has not been mentioned in other literature.

Summary of the invention

In view of the deficiencies in the prior art, the present invention extracts lignin from the fruit shells, which are a large amount of waste from the longan industry, and prepares them into composite sunscreen particles for use in sunscreen products. Not only do they not have the disadvantages of the first and second types of sunscreen products, but also due to their lower cost, they can be better applied to the field of cosmetic sunscreen. Not only do they reasonably utilize the waste resources of the longan industry, but they also provide a green, natural, safe, and effective sunscreen skin care product and a preparation method thereof.

The technical solution adopted by the present invention to solve the technical problem is:

A sunscreen skin care product comprises the following ingredients: longan shell lignin composite sunscreen particles, a thickener, a neutralizer, a natural moisturizer, a natural plant extract, a natural preservative and deionized water.

Preferably, the longan shell lignin composite sunscreen particles are 5%-10%, thickener is 0.5%-1%, neutralizer is 1%-2%, natural moisturizer is 2.6%-7%, natural plant extract is 2%-5%, natural preservative is 1%-2%, and the balance is deionized water.

Another technical problem to be solved by the present invention is to provide a method for preparing a sunscreen skin care product, comprising the following steps:

Weigh choline chloride and lactic acid in a molar mass ratio of choline chloride:lactic acid = 1:5-1:10, put them into a beaker, place them in an oil bath and heat them at 80-100° C., stir and react for 2-6 hours, and after sufficient reaction to form a transparent uniform liquid, a choline chloride/lactic acid low eutectic solvent is obtained, take it out, cool it, seal it and store it for later use;

The longan shell was washed and dried at 80-90℃ for 12-24h, crushed with a pulverizer and passed through a 100-mesh sieve, and the obtained longan shell powder was put into a sealed bag and placed in a dryer for standby use; the longan shell powder was weighed, and the mixture was fully mixed with DES according to a solid-liquid ratio (g/mL) of longan shell powder: DES = 1:10-1:30, and then placed in an oil bath pot and heated at 90-150℃, stirred for reaction for 6-12h, and centrifuged after cooling; the supernatant was poured into a beaker, and the residue was poured into a Buchner funnel and filtered with an airtight filter. The mixture is washed with water and ethanol by suction filtration for 3-5 times, the filtrates obtained by filtration are combined and the ethanol is evaporated by a rotary evaporator to obtain a concentrated solution, the supernatant and the concentrated solution are combined and slowly added into 4-6L deionized water and stirred for 15-25min, and allowed to stand for 12h, and then centrifuged at 9000-11000r/min for 20-30min to separate the solid precipitate; the obtained solid precipitate is dried in an oven at 80-90°C for 24 hours, and the obtained black solid is longan shell lignin;

Weighing longan shell lignin and dispersing it in deionized water, slowly dropping a NaOH solution with a concentration of 10%-20% while stirring, adjusting the pH value of the solution system to 9.2-9.4, and then continuing to stir for 10-15 minutes to uniformly disperse the longan shell lignin in the deionized water to prepare a longan shell lignin solution; weighing sodium alginate and dispersing it in deionized water, slowly dropping a NaOH solution with a concentration of 10%-20% while stirring, adjusting the pH value of the solution system to 8.2-8.5, and then continuing to stir for 10-15 minutes to uniformly disperse the sodium alginate in the deionized water to prepare a sodium alginate solution;

The prepared longan shell lignin solution, sodium alginate solution, and natural plant essential oil with sunscreen and repair effects are measured and added into a beaker in a volume ratio of longan shell lignin solution: sodium alginate solution: natural plant essential oil = 5:5:1-10:10:1, dispersed with an ultrasonic crusher for 5-10 minutes, the upper white emulsion is washed with deionized water and centrifuged for 3 times to remove alkalinity (9000-11000r/min, 20-30min), and then vacuum freeze-dried for 48-72h to obtain longan shell lignin composite sunscreen particles;

Weigh the thickener and add it into deionized water, heat and stir at 80-90°C until fully dissolved to obtain a thickener solution;

Weigh allantoin and add it to deionized water, heat and stir at 80-90°C until fully dissolved to obtain an allantoin solution (this moisturizer is soluble in hot water and slightly soluble in water, and needs to be heated and dissolved separately);

Weigh sodium hyaluronate and add it to deionized water, stir until fully dissolved, and obtain a sodium hyaluronate solution (this moisturizer is easy to agglomerate when added to water, and needs to be stirred for a long time to be completely dissolved, so it needs to be dissolved separately);

The thickener solution is cooled to about 40-50° C., and a neutralizer, longan shell lignin composite sunscreen particles, other easily soluble natural moisturizers, natural plant extracts, natural preservatives, and balance water are added. The solution is stirred evenly with a magnetic stirrer, and sterilized at a high static pressure of 400-600 MPa for 5-10 minutes. The solution is bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions.

Among them, sodium alginate is a natural polysaccharide that can be extracted from seaweed. It is slightly soluble in water and insoluble in most organic solvents. It dissolves in alkaline solutions, making the solution viscous. It has multiple functions and is widely used in the food industry, the medical field, and the cosmetics field. In the food industry, sodium alginate can be used as a thickener and gelling agent to provide the texture and taste of food. At the same time, sodium alginate also has moisturizing properties, which can prevent the loss of water in food and extend the shelf life of food. In the medical field, sodium alginate can be used as a carrier for drugs to help drugs with stability, solubility, viscosity and safety. Sodium alginate is widely used in the preparation of enteric-coated tablets and controlled-release drugs, which can control the release rate and absorption effect of drugs. In addition, sodium alginate also has biological activities such as antiviral, antitumor, and anticoagulant, which has certain benefits to human health. The application of sodium alginate is not limited to the food industry and the medical field, they are also widely used in other fields. For example, in cosmetics, sodium alginate can be used as a sunscreen and antioxidant to protect the skin from damage by ultraviolet rays and free radicals; it also has a whitening effect. Tyrosinase is a key enzyme in the formation of melanin. When sodium alginate meets tyrosinase, it can affect the activity of tyrosinase, adsorb a large amount of copper ions, and interrupt the synthesis of melanin. This reduces the formation and excessive deposition of melanin, showing a whitening and brightening effect on the skin. In addition, it can also be used to prepare biomaterials and biomedical engineering, with good biocompatibility and degradability.

Preferably, the natural plant essential oil with sunscreen and repair effects is any one of Niaouli essential oil, eucalyptus essential oil, rhododendron essential oil, geranium essential oil, frankincense essential oil, and sandalwood essential oil, or a mixture thereof.

Among them, Melaleuca viridiflora is a plant of the genus Melaleuca in the plant kingdom, angiosperms, Magnoliaceae, Rosaceae, Myrtales, Myrtaceae. The fragrance of Niaouli essential oil is fresh and soft, and it has strong sedative, hypnotic, antibacterial, anti-inflammatory and analgesic effects. It can effectively relieve stress, anxiety, insomnia and various pains, enhance immunity and improve the quality of life. The fragrance of Niaouli essential oil is very helpful for sleep quality, can regulate the biological clock, help create a comfortable sleeping environment, relieve insomnia problems and improve sleep quality. Its essential oil has a strong calming effect, can soothe emotions, relax the body and mind, relieve stress and anxiety. It can balance emotions and help enter a meditative state. It has analgesic effects on the nervous system and can relieve headaches, joint pain and muscle pain. It can also relieve uterine pain and menstrual pain. It has antibacterial and antiviral effects, can enhance immunity, and help prevent colds, flu and other diseases. It also has anti-inflammatory effects and can relieve inflammations such as sinusitis and arthritis. It has extremely strong antibacterial, antiviral and anti-inflammatory effects, and can effectively reduce inflammation, detoxify, clear away heat and cool blood. It is often used to treat pneumonia, rhinitis, abscesses, boils, etc. Niaouli essential oil can reduce inflammation and kill bacteria, stimulate tissues, promote local blood circulation, enhance body resistance, and has the effects of removing wrinkles, whitening, and removing spots. In addition, it also has good sun protection and radiation protection effects. It can not only be used in the production of sunscreen in summer, but also as an important ingredient in daily skin care products for computer users;

Eucalyptus robusta Smith, also known as Eucalyptus urophylla, Eucalyptus rutaecarpa, Eucalyptus eryngii, Eucalyptus eryngii, Eucalyptus lanceolata, is an evergreen tree of the Myrtaceae family. It is native to the frost-free coastal areas of eastern and northeastern Australia. The Chinese Medical Encyclopedia states that "Eucalyptus leaves have the effects of clearing away heat and detoxifying, killing insects and relieving itching, and astringing and promoting tissue regeneration. Modern studies have shown that Eucalyptus leaves have antibacterial, anti-inflammatory, and antioxidant effects." Eucalyptus essential oil has anti-inflammatory and bactericidal effects, and can also improve the skin and relieve mental tension, and can also achieve antiviral effects. Eucalyptus essential oil can improve inflammatory lesions caused by the invasion of various pathogens, such as upper respiratory tract infections, and help relieve various clinical symptoms caused by diseases such as pharyngitis, tonsillitis, and rhinitis. At the same time, it can regulate symptoms such as colds and flu, and wind-heat colds, which can purify the inflammation in the body and prevent the condition from getting worse. Eucalyptus essential oil has obvious effects on skin burns, preventing bacterial growth and pus accumulation, promoting the construction of new tissues, improving suppuration, herpes, acne skin, and unblocking pores; cuts, wounds, ulcers and inflammation symptoms all respond well to the use of eucalyptus essential oil. It can also expel toxins from the skin as soon as possible, which is beneficial to improve the dull complexion and increased skin spots caused by the accumulation of toxins in the skin, and can make the skin more delicate and smooth. Eucalyptus essential oil can be used for beauty and skin care. When washing your face every day, pour a small amount of essential oil to wash your face, which can achieve the effect of whitening and removing yellowness and eliminating acne. It can also maintain the skin, make the skin white, and prevent wrinkles. Eucalyptus essential oil can also achieve the effect of improving mental state, soothing the nervous system, and avoiding severe mental tension and irritability. Eucalyptus essential oil also has antiviral effects. After use, it can inhibit the replication of viruses in the body and help improve viral infectious diseases, such as viral colds or viral enteritis. It is most effective for respiratory diseases, can relieve inflammation, and make the nasal mucosa comfortable, such as colds, coughs, sinusitis, etc. It can prevent colds, improve sore throats, and is also effective for fever, which can lower body temperature and cool the body; it can also eliminate body odor, improve migraines, refresh the mind, and concentrate attention; it is also helpful for the reproductive and urinary systems, and can improve cystitis and diarrhea. In addition, it has excellent sunscreen and radiation protection properties and can be used in sunscreen cosmetics. Eucalyptus essential oil helps to quickly relieve sunburn. This essential oil has anti-inflammatory and analgesic properties, which can immediately relieve sunburn. Its application on sunburned skin numbs the pain and provides a soothing effect. Its antibacterial properties can also protect sensitive, sunburned skin from infection;

Leptospermum scoparium J.R.Forst.et G.Forst. is a small shrub of the Myrtaceae family. It is called "Leptospermum scoparium" because its flowers are full of branches and look like plum blossoms from a distance, and its leaves are as thin as pine leaves. Leptospermum scoparium is native to New Zealand, Australia and other countries, and is now distributed in Malaysia, Indonesia and other places. It is distributed in southern South China, southern Southwest China and southeastern East China. The plant of Leptospermum scoparium has certain medicinal value; at the same time, the extracted essential oil has a strong bactericidal function, can resist mold and virus, and is also used to treat various respiratory diseases. Its therapeutic effect is very amazing, and its history of use is quite long. It is used for antipyretic and analgesic treatment in the treatment of trauma and colds. In addition, it is made into honey and herbal tea, which is beneficial for gastric ulcers. Leptospermum scoparium essential oil has been proven to have the highest antibacterial activity. There is evidence that its bactericidal effect is more than 20 times that of Australian tea tree essential oil, and it can resist viruses, molds and has strong bactericidal ability. Pine red plum essential oil has an inhibitory effect on herpes simplex virus HSV-1 and HSV-2, and can help alleviate its symptoms. Adding a few drops of pine red plum essential oil to the hot water for foot bathing can achieve the purpose of activating blood circulation and meridians, and can also achieve the effect of removing athlete's foot and foot odor. Pine red plum essential oil has strong antibacterial and anti-inflammatory properties, and also has an antispasmodic effect. It has a relieving effect on various respiratory tract infections, such as colds, nasopharyngeal mucositis, sinusitis, bronchitis, sore throats, etc. Pine red plum essential oil has an antibacterial effect on caries-causing bacteria, and can reduce inflammation and relieve pain, which can help fight dental plaque, gingivitis and oral mucositis induced by radiotherapy. Pine red plum essential oil has antioxidant and anti-aging properties, and can reduce wrinkles and increase skin thickness by inhibiting the loss of collagen fiber content and epidermal hyperplasia. In addition, it also has inhibitory activity on skin inflammation caused by ultraviolet radiation. It is also a skin bactericide, which can treat skin diseases such as knife wounds, spots, burns, furuncles, ulcers, etc., and is especially suitable for wounds that have not healed for a long time. Pine red plum essential oil has significant antibacterial activity against Staphylococcus epidermidis (ATCC 2223) and Propionibacterium acnes (ATCC 11827), two pathogens that cause acne, and can inhibit the growth of acne. Pine red plum essential oil has good anti-allergic properties, so it can treat mosquito bites and control allergies. It is also a good local analgesic, which can relieve muscle soreness and rheumatic pain. Its charming fragrance makes it very suitable for mixing with other essential oils to improve the taste of other essential oils, especially essential oils with good efficacy but strong medicinal taste. It is very effective in fighting infection. Pine red plum essential oil has a strong smell, which is very pleasant to smell, and has anti-anxiety activity, which can relax people, soothe the body and mind, and stabilize the skin state; regulate neurotransmitters such as histamine; like pheromones, enhance sexual attraction; promote skin and mucosal tissue regeneration and wound healing. Pine Red Plum essential oil has insecticidal properties against spotted wing drosophila, Aedes aegypti larvae and mites, and can improve the living environment. In addition, it also has excellent UV protection properties, so it can be used in sunscreen cosmetics;

Pelargonium hortorum Bailey is a herbaceous plant of the genus Pelargonium in the family Geranium. It is native to southern Africa. In the middle of the 20th century, it was introduced to China and is now widely cultivated in various places. The stems and leaves of geranium contain volatile oils, which can extract aromatic alcohol, vanillyl alcohol, geranyl esters, etc., becoming an indispensable fragrance in industry. Geranium essential oil contains citronellol, citronellol formate, pinene, geranic acid, geraniol, terpineol, citral, menthone and a variety of trace mineral elements. Its main function is to regulate the skin. Its active ingredients have a strong affinity with natural organic fats and are suitable for almost all skin conditions. Geranium essential oil can relieve pain, astringe, anti-inflammatory, antibacterial, penetrate scars, enhance cell defense function, stop bleeding, and replenish the body. It can deeply cleanse the skin and balance sebum secretion. It is especially suitable for oily skin and acne skin. It has deep purification and astringent effects, and has a good effect on relieving and eliminating acne and acne marks. Geranium essential oil can play an anti-inflammatory and skin-soothing role. It can promote the regeneration of skin cells, repair scars and stretch marks, and is suitable for sunburned skin recovery, softening the skin, and making the skin plump and shiny. At the same time, it is also very good for loose, clogged pores and oily skin, and can be called a comprehensive cleansing oil. Geranium essential oil is beneficial for eczema, burns, shingles, herpes, ringworm and frostbite. It can also remove blackheads. You can directly add geranium essential oil to facial cleanser for cleansing, and the blackheads will come out naturally. Geranium essential oil is a natural stain remover. Geranium is suitable for all skin types, can promote fluid circulation, and restore pale skin color to rosy and vitality. Therefore, when you age and it is difficult for your skin to maintain its radiance, you can use geranium essential oil to increase the rosy luster of the skin. Geranium essential oil has a good anti-depressant ability and can soothe the body and mind;

Frankincense is a resin exuded from the bark of the frankincense tree (Boswellia carterii Birdw.) and the same genus (Boswellia bhaurdajiana Birdw.) of the olive family. Frankincense essential oil is extracted from frankincense resin, exuding a warm and pure woody aroma, and a light fruity fragrance, which can make people feel unprecedented relaxation and soothing. Frankincense essential oil has the effects of antibacterial and enhancing cell activity. Its astringent properties are conducive to the healing of skin wounds, allowing cells to be repaired quickly, and has a rejuvenating effect. Frankincense essential oil has excellent anti-aging properties, can give new life to aging skin, and has excellent effects in fading fine lines and smoothing wrinkles. It is a real skin care product. Frankincense essential oil has a strong antioxidant capacity, which can prevent free radical damage and slow down skin aging. Frankincense essential oil has a good moisturizing effect, can moisturize dry skin, and improve skin elasticity and luster. The ingredients in frankincense essential oil can promote the skin to produce collagen, make the skin tighter, and reduce the formation of wrinkles. Frankincense essential oil can restore skin elasticity, tighten pores, improve sagging, and enhance firmness. Frankincense essential oil can promote cell regeneration, fade skin spots, make the skin more even and fair, and has the effect of whitening and removing spots. Frankincense essential oil has astringent properties and can also balance oily skin. The ingredients in frankincense essential oil have strong anti-inflammatory effects and can relieve skin inflammation, reduce redness, swelling and itching. Frankincense essential oil can improve dry, inflamed, and sensitive skin, and has a repairing effect on wounds, trauma, ulcers, sunburn and inflamed skin;

Sandalwood (Santalum album L.) is an evergreen small tree of the Santalum genus of the Santalaceae family. It is native to the Pacific Islands and is mainly cultivated in India. The sandalwood tree is called the "golden tree" because almost all of its body is a treasure, and each part has a high economic value. The heartwood of sandalwood is a precious Chinese medicine. The roots and trunk fragments of sandalwood trees can be used to extract essential oils, which are commonly known as "liquid gold". The young branches of the sandalwood crown and some branches pruned during the growth process are raw materials that high-end incense factories are vying to purchase, and are also good materials for carving crafts. Sandalwood essential oil has the effects of calming the nerves, calming down, and relieving insomnia. It can soothe nervous tension and anxiety, relax people, and relieve physical and mental fatigue. The main components of sandalwood essential oil include α-santalol, β-santalol, and santalone, which give sandalwood essential oil its unique effect in whitening and lightening spots. α-santalol exhibits significant antioxidant and anti-inflammatory effects. This means that it can neutralize and weaken, destroy skin aging, and reduce skin inflammation, creating good conditioning for light spots. In addition, some experiments have also found that β-santalol has a certain effect on the production of melanin adsorbed by the skin. This means that sandalwood essential oil can not only help weaken existing skin melanin, but also prevent the deposition of new melanin. The role of sandalwood essential oil in whitening and lightening is multi-faceted. When formulating whitening and lightening essential oils, the antioxidant and anti-inflammatory effects of sandalwood essential oil help to reduce skin sensitivity, so it is more suitable for use in whitening and lightening products. Sandalwood essential oil has the effect of promoting the growth of skin cells, can quickly restore wounds or scars, and then has elasticity and tightening effects; it is particularly suitable for the maintenance of aging, dry and dehydrated skin, can balance and soften the skin, improve dryness, fade texture, scars, fine lines, moisturize the skin, and prevent wrinkles. It can be used for dry skin, hardened skin keratin, dry eczema, trauma, sunburn, etc. Sandalwood essential oil also has antibacterial and anti-inflammatory effects, and can treat wound infections, skin inflammation, itching, and improve pimples, boils, and infected wounds. The cooling properties contained in sandalwood essential oil can be used to calm sunburned and inflamed skin, soothe and cool burns, get rid of uneven tanning, and remove bacteria to avoid causing infection.

Preferably, the thickener is carbomer.

Carbomer is a polymer of acrylic acid bonded to allyl sucrose or pentaerythritol allyl ether. It is a commonly used cosmetic additive. Carbomer has many functions and effects in beauty and skin care. It can protect the skin, moisturize, promote skin repair, anti-wrinkle, whiten, etc. It is a commonly used beauty ingredient. Carbomer can protect the skin. It has a certain affinity with the skin, so adding carbomer to skin care products can reduce the irritation and damage of irritating substances to the skin and mucous membranes. Carbomer can resist ultraviolet rays, enhance our skin's resistance to ultraviolet rays, and reduce the damage of ultraviolet rays to the skin. Therefore, many people use it as an ingredient in sunscreen. Carbomer can reduce viscosity because it has a certain degree of looseness and is a slightly acidic substance with a particularly strong ability to dilute things. When making many cosmetics, especially gel cosmetics, adding carbomer can reduce the viscosity of these substances to maintain a suitable viscosity of the cosmetics. After neutralization, carbomer is an excellent gel matrix, which has important uses such as thickening and suspension. It has simple process and good stability, and is widely used in lotions, creams and gels. Carbomer can absorb water to keep the skin moisturized, and at the same time it can promote the hydration of the stratum corneum and enhance the water retention capacity of the skin. Carbomer has certain anti-inflammatory and bactericidal effects. Because it is a natural medicinal ingredient, it has certain anti-inflammatory and bactericidal effects, so it can be used to make some cosmeceutical ingredients. Carbomer has anti-inflammatory, anti-allergic and antioxidant effects, and can protect the skin from damage by the external environment, such as ultraviolet rays and pollution. Carbomer can promote the proliferation and differentiation of skin cells, accelerate skin repair, and has a certain improvement effect on skin problems such as trauma, burns, and dermatitis. Carbomer can inhibit the action of collagenase, thereby reducing the formation of wrinkles and making the skin tighter and smoother. Carbomer has a whitening effect, which can inhibit the formation of melanin, reduce pigmentation such as spots and freckles, and make the skin whiter. It can also ensure the quality of cosmetics through some comprehensive effects. Therefore, Carbomer occupies a relatively important position in the cosmetics production industry.

Preferably, the neutralizing agent is triethanolamine.

Triethanolamine is a colorless and transparent liquid, an organic compound, commonly used as a cosmetic ingredient, which can play an antibacterial and anti-inflammatory role, and can also improve symptoms such as rough and dry skin. It can also be used to treat skin inflammation, such as contact dermatitis, chronic eczema, etc. Triethanolamine is used as an emulsifier, moisturizer, humectant, thickener, and pH balancer in cosmetics (including skin washing, eye gel, moisturizing, shampoo, etc.). In cosmetic formulas, it is used to neutralize with fatty acids to form soaps, and to neutralize with sulfated fatty acids to form amine salts. Triethanolamine is a commonly used emulsifier in cream preparations. Cream products emulsified with triethanolamine have the characteristics of delicate cream and bright white cream. In addition, the colloidal phase formed by triethanolamine and higher fatty acids or higher fatty alcohols has good stability, stable product quality, and can tolerate a high proportion of added ingredients. Triethanolamine is the most commonly used neutralizer for acidic polymer gels containing carbomer and other acidic polymers. Triethanolamine forms a stable polymer structure by neutralizing with the carboxyl group of carbomer, achieving the application effect of thickening and moisturizing. This substance can also play a whitening role by improving the pH value of the skin. Because the pH value of human skin is acidic, and too high or too low pH value will cause dull skin, spots and other problems. Triethanolamine can adjust the pH value of the skin to a healthy pH range, making the skin brighter and smoother.

Preferably, the natural moisturizer is any one of glycine, serine, sodium hyaluronate, and allantoin, or a mixture thereof.

Among them, glycine, also known as aminoacetic acid, is a non-essential amino acid. In cosmetics and skin care products, glycine can improve visible signs of aging, improve moisture retention, increase collagen production and promote skin repair and regeneration. Glycine is believed to help support healthy collagen production and stimulation. When applied topically, glycine penetrates the skin because amino acids are small molecules, especially glycine, one of the smallest. One of the main factors contributing to the formation of fine lines and wrinkles is the reduction in the amount of collagen in the skin. As we age, the body produces less and less collagen. As we age, the skin becomes thinner and more fragile. Collagen has a triple helix structure and is composed of glycine and two other amino acids, proline and hydroxyproline. Glycine can help support collagen production, help maintain skin firmness and promote skin repair and regeneration. Glycine can also benefit the skin by supporting moisture retention. Glycine and other amino acids occur naturally in the skin as part of the natural moisturizing factor. The natural moisturizing factor is composed of amino acids, sugars and electrolytes that keep the skin surface intact, soft and hydrated. Specifically, amino acids work with aquaporins, or the body's water transport system, to move water throughout the skin. Therefore, topical application of amino acids, like glycine, may help improve water retention in the skin. Glycine can help improve product stability. It also acts as a buffer, which means it can be used to establish and maintain the pH of cosmetic formulations. In chemistry, pH stands for "potential hydrogen" and refers to the level of acidity or alkalinity in a given solution. Adding glycine to an acidic or alkaline solution will make it neutral, which is good news for sensitive skin types, who can become irritated if the pH is outside the skin's normal pH range (4.7-5.75);

Serine, also known as β-hydroxyalanine, is the basic unit of protein and one of the 21 amino acids that make up human protein. Serine is necessary to maintain normal physiological functions of the human body and can participate in the synthesis of proteins in the body. It plays a certain role in maintaining the normal metabolism of skin tissue cells and delaying skin aging. Serine can be used as an antioxidant in cosmetics, which can inhibit lipid peroxidation, reduce the damage of free radicals to the skin, and help maintain the elasticity and luster of the skin. Serine is one of the essential amino acids for the human body. It is a necessary substance to maintain normal metabolism of the human body and a catalyst for biochemical reactions. Therefore, serine can play an antioxidant role, reduce the damage of ultraviolet rays to the skin, inhibit the production of melanin, and improve symptoms such as dull skin and spots to a certain extent, thereby achieving a whitening effect. Serine can help improve sleep quality, so to a certain extent, it can also help relieve anxiety, depression and other negative emotions, thereby improving the quality of human sleep. Serine can play a moisturizing role, replenish the moisture needed by the skin, thereby improving uncomfortable symptoms such as dry skin and peeling, making the skin more elastic, and the substance can also promote skin cell regeneration, which is beneficial to moisturizing the skin. Serine is a small molecule that is easily absorbed by the skin and is helpful for dry or sagging skin. In addition, it has the function of removing acne and can help improve skin oiliness by moisturizing. If you have dry, rough, dull skin, etc., using serine cosmetics appropriately can improve your skin condition;

Sodium hyaluronate is an inherent component in the human body. It is a kind of glucuronic acid and is widely present in tissues and organs such as the placenta, amniotic fluid, lens, articular cartilage, and the dermis of the skin. It is distributed in the cytoplasm and intercellular matrix, and plays a lubricating and nourishing role on the cells and cell organs contained therein. Moisturizing is the most important role of sodium hyaluronate in cosmetics. Compared with other moisturizers, the relative humidity of the surrounding environment has less effect on its moisturizing property. Sodium hyaluronate has excellent anti-wrinkle properties. The moisture level of the skin is closely related to the content of sodium hyaluronate. With the increase of age, the content of sodium hyaluronate in the skin decreases, which weakens the water retention function of the skin and produces wrinkles. The aqueous solution of sodium hyaluronate has strong viscoelasticity and lubricity. When applied to the surface of the skin, it can form a moisturizing and breathable film to keep the skin moisturized and shiny. Small molecule sodium hyaluronate can penetrate into the dermis, promote blood microcirculation, and facilitate the skin's absorption of nutrients, playing a health care role in beauty and anti-wrinkle. Sodium hyaluronate has good film-forming and lubricating properties. It is a high molecular polymer. It has obvious lubrication and good hand feel when applied. Large molecule sodium hyaluronate can form a breathable film on the skin surface, making the skin smooth and moist, blocking the invasion of foreign bacteria, dust, etc.; small molecule sodium hyaluronate can penetrate into the dermis, slightly dilate capillaries, increase blood circulation, improve intermediate metabolism, promote skin nutrient absorption, and achieve lubrication and plump effects. Compared with general moisturizers, sodium hyaluronate has the highest moisture absorption at low relative humidity (33%) and the lowest moisture absorption at high relative humidity (75%). This unique property is adapted to the skin's requirements for cosmetic moisturizing effects in different seasons and different environmental humidity, such as dry winter and humid summer. Sodium hyaluronate is an inherent biological substance of the skin, and exogenous sodium hyaluronate is a supplement to endogenous sodium hyaluronate in the skin. Sodium hyaluronate with a smaller mass can penetrate into the epidermis of the skin, promote the supply of skin nutrients and the excretion of waste, thereby preventing skin aging and playing a role in beauty and skin care. Sodium hyaluronate has sun protection and skin damage repair effects. When the skin is exposed to sunlight and causes photoburn or sunburn, such as redness, blackening, peeling, etc., sodium hyaluronate can eliminate the active oxygen free radicals produced by ultraviolet rays in the sun on the skin surface, protect the skin from ultraviolet damage, and promote the proliferation and differentiation of epidermal cells to promote skin regeneration in the injured area. Sodium hyaluronate has a whitening effect. It can promote skin metabolism and help improve symptoms such as dull skin and pigmentation. Therefore, the use of sodium hyaluronate can play a whitening role. Prior use also has a certain preventive effect. Its mechanism of action is different from that of the ultraviolet absorbers commonly used in sunscreens. Therefore, sodium hyaluronate is mixed with ultraviolet absorbers in sunscreen skin care products. It has a synergistic effect, which can simultaneously reduce the penetration of ultraviolet rays and repair the skin damage caused by a small amount of ultraviolet rays that penetrate, playing a dual protective role. Sodium hyaluronate has a high viscosity in aqueous solution. Its 1% aqueous solution is gel-like. It can be added to cosmetics to thicken and stabilize.

Allantoin, also known as N-(2,5-dioxo-4-imidazolinyl)urea, is a natural moisturizing factor synthesized in the body and is also a common active ingredient in cosmetics. In cosmetics, allantoin mainly plays the role of moisturizing and keratin softening. The primary effect of allantoin is moisturizing. Adding allantoin to cosmetics can enhance the skin's ability to retain moisture, help the skin resist the erosion of a dry environment, and maintain the skin's moisture and elasticity. While promoting the skin's outermost layer's ability to absorb water and reducing the evaporation of skin moisture, allantoin can also form a lubricating film on the skin surface, thereby sealing the moisture to achieve the effect of moisturizing the skin. Allantoin has a good moisturizing effect. For dry and rough skin, it can restore its smoothness and moisture. At the same time, it can enhance the skin's ability to absorb water, repair the damaged stratum corneum, and restore the skin's natural ability to absorb water. Allantoin has anti-inflammatory, anti-oxidant, cell growth promotion, accelerated wound healing, softening keratin, etc. It is a good healing agent and anti-ulcer agent for skin trauma. It can be used to relieve and treat dry skin, scaly skin diseases, skin ulcers, digestive ulcers and inflammation. It has good effects on osteomyelitis, diabetes, liver cirrhosis and acne. Allantoin can promote skin metabolism and accelerate the metabolism of old dead skin cells and precipitated melanin, so it has the so-called whitening effect. Allantoin can change the structure of protein in the stratum corneum, making it soft, which helps to remove excess keratin cells, prevent pores from clogging, and help improve skin quality. At the same time, the solubility of allantoin makes it easier for cosmetics to be evenly distributed on the skin, improves the skin's ability to absorb other active ingredients, and thus enhances the efficacy of cosmetics. Therefore, many moisturizing cosmetics, such as cleansing products, hand creams, skin care lotions, etc., contain allantoin. Since allantoin is an amphoteric compound, it can combine with multiple substances to form complex salts. It has the functions of light protection, sterilization, analgesia, and antioxidant. It can keep the skin hydrated, moisturized, and soft. It is a special additive for beauty and hairdressing cosmetics. It is widely used as an additive for freckle cream, acne solution, shampoo, soap, toothpaste, shaving lotion, hair conditioner, astringent, antiperspirant and deodorant lotion, etc. Cosmetics with allantoin have the functions of protecting tissues, being hydrophilic, absorbing water, and preventing moisture from radiating; hair creams, hair creams, and shampoos with allantoin have a protective effect on hair, which can prevent hair from splitting and growing continuously; lipsticks and face creams with allantoin can make the skin and lips soft, elastic, and have a beautiful luster. Allantoin promotes tissue growth, cell metabolism, and softens stratum corneum protein. Allantoin is not only mild and non-irritating in itself, but can also reduce the irritation of other ingredients to the skin, so sensitive skin can also use it with peace of mind.

Preferably, the natural plant extract with after-sun repairing effect is any one of turmeric extract, cucumber extract, saffron extract, marigold extract or a mixture thereof.

Among them, turmeric extract is derived from the dried rhizome of turmeric (Curcuma longa L), a plant of the ginger family. It has significant effects in medicine and cosmetics. It is used in skin care products, mainly for anti-dandruff, anti-inflammatory and antioxidant effects. Turmeric is rich in flavonoids, such as curcumin and turmeric ketone, which can neutralize free radicals, reduce the damage of oxidative stress to the skin, help delay the aging process of the skin, reduce the appearance of fine lines and wrinkles, and play an antioxidant and anti-aging role. It is also considered to be the first choice for preventing and treating a series of skin diseases, such as psoriasis, acne, wounds, burns, eczema, sunburn and preventing aging. Curcumin in turmeric extract has the effect of inhibiting the production of melanin, which can reduce the formation of dark spots and freckles, even out skin color, and inhibit the activity of tyrosinase, reduce pigmentation, and make the skin brighter and fairer, so it has a good whitening effect. Turmeric extract has a broad spectrum of antibacterial activity and can inhibit the growth of a variety of bacteria and fungi. It can be used to treat acne and other skin infections and reduce skin problems caused by pathogenic microorganisms. Turmeric extract has a significant anti-inflammatory effect, which can inhibit the inflammatory response and the production of inflammatory mediators, and can reduce inflammatory symptoms such as redness, itching and pain caused by skin problems, such as acne, eczema and dermatitis. Turmeric extract also contains rich moisturizing ingredients, which can increase the moisture content of the skin, improve the water and oil balance of the skin, provide moisturizing and softening effects, and make the skin smoother and more elastic.

Cucumber (Cucumis sativusLinn), also known as cucumber and cucumber, is a plant of the genus Cucumis in the Cucurbitaceae family. Cucumber extract contains many active ingredients, such as vitamins, minerals, amino acids, phytosterols, colloids, cucurbitacins, etc. Among them, amino acids can effectively keep the skin hydrated. It is widely used as a hydrating agent, emollient, astringent, and cooling agent in skin care products. It can be added to cleansing, moisturizing, soothing, and refreshing skin care products. It is especially suitable for soothing and repairing skin after sun exposure. Cucumber extract has the effect of whitening the skin because it is rich in vitamin C and polyphenol compounds. These ingredients can inhibit the production of melanin, reduce skin pigmentation, and make the skin whiter and more translucent. Cucumber extract is rich in vitamin E, which can prolong life and resist aging. It also contains cucumber enzymes, which have strong biological activity, can effectively promote the body's metabolism, and have the effect of moisturizing and smoothing wrinkles;

Saffron (Crocus sativus L.), also known as saffron and saffron, is a perennial flower of the genus Crocus in the family Iridaceae and is also a common spice. It is a native species in southwestern Asia and was first cultivated by the Greeks. It is mainly distributed in Europe, the Mediterranean and Central Asia. It was introduced to China during the Ming Dynasty. The Compendium of Materia Medica listed it as a medicine and it is planted in Zhejiang, China and other places. It is a precious Chinese medicinal material with strong physiological activity. Its stigma is used as medicine in Asia and Europe, and has sedative, expectorant and antispasmodic effects. The most important factor affecting skin aging is photoaging. It is now generally believed that photoaging accounts for 90% of the impact of skin aging. Photoaging damages our skin at any time under ultraviolet irradiation: ultraviolet rays can cause the skin to produce ROS, and a large amount of ROS will attack the normal cells in our skin. When the damage rate is greater than the skin's own repair rate, it will cause a series of skin reactions and produce oxidative damage. These include decreased activity of epidermal cells, oxidative damage to DNA and proteins, and increased activity of matrix metalloproteinases, which lead to degradation of collagen and elastin, and further produce aging phenomena such as dullness, roughness and wrinkles. Saffron, as an important aromatic plant, is known as the "golden condiment". Saffron extract is derived from the dry stigma of saffron and is an all-round ingredient for repairing skin aging in many aspects. Saffron extract can promote skin metabolism, remove free radicals, inhibit melanin deposition, accelerate spot removal and decolorization, absorb ultraviolet rays, etc. In addition, it also has whitening, sun protection, and anti-aging effects. Saffron extract can improve photoaging and directly attack skin oxidative damage. The crocin in it is equivalent to a large sponge that can absorb various light wave attacks from ultraviolet rays. Experiments have shown that even at low concentrations, its removal effect can reach 80%. For the degradation of collagen, elastin, hyaluronic acid, etc. caused by photoaging, saffron extract can inhibit matrix metalloproteinases, elastases, and hyaluronidases, thereby resisting ultraviolet radiation, and the inhibition rate is about 60%. At the same time, it can restore the proliferation of skin fibroblasts and the ability to synthesize collagen, playing an anti-photoaging role. Saffron extract can also inhibit irritation factors and effectively stabilize and repair the skin. In addition, saffron extract has outstanding moisturizing ability and can improve the ability of the skin to lock in water. With the continuous use of products containing saffron extract, the moisturizing effect becomes better and better. Its moisturizing mechanism is different from that of general moisturizing products that simply absorb and prevent moisture. It may be related to its ability to promote the improvement of the skin's internal structure;

Marigold (Tagetes erecta L.) is an annual herbaceous plant of the genus Tagetes in the Asteraceae family. It is native to Mexico and is cultivated throughout China. Marigold extract is a commonly used natural drug ingredient. It has multiple functions and can be used to treat a variety of diseases and improve physical health. Marigold extract is rich in flavonoids, polysaccharides, amino acids and other ingredients. These ingredients have good moisturizing, antioxidant, anti-inflammatory, antibacterial and other effects, so they can be used in the field of cosmetics. Marigold extract is rich in polyphenol compounds. These compounds have strong antioxidant effects, can scavenge free radicals, and protect cells from oxidative damage. Marigold extract can promote skin cell metabolism, enhance skin self-repair ability, improve skin texture, and reduce skin aging. Marigold extract can separate 27 triterpenoid compounds with anti-inflammatory effects, which can eliminate skin inflammation, inhibit skin-induced allergies, reduce skin allergic reactions, and repair sun-exposed skin. Marigold extract can enhance the resistance of capillaries, inhibit capillary permeability and have anti-inflammatory effects; at the same time, it can eliminate free radicals, has antioxidant properties, and has an anti-aging effect. Marigold extract also has a certain inhibitory effect on melanocytes, so it has the effect of whitening and removing spots. Marigold flowers contain lutein, which can prevent ultraviolet damage and inhibit the production of free radicals, and can be used in sunscreen products. Marigold extract can be used in products such as creams, lotions, essences, and masks. It can effectively improve the moisture content of the skin, enhance the elasticity and glossiness of the skin, and reduce problems such as dryness, roughness, and wrinkles on the skin. In addition, marigold extract can also be used in products such as lipsticks and lip balms, which can effectively moisturize the lip skin and prevent chapped lips.

Preferably, the natural preservative is any one of thyme essential oil, oregano essential oil, cinnamon essential oil, clove essential oil or a mixture thereof.

Among them, thyme (Thymus mongolicus (Ronniger) Ronniger), a small semi-shrub plant of the genus Thymus in the Lamiaceae family. The name of thyme originated from Greece, because the plant is fragrant and has an elegant and rich musky scent. Thyme is native to the Mediterranean area and is distributed in Gansu, Shaanxi, Inner Mongolia and other places in China. Thyme essential oil is one of the most antiseptic essential oils. It can be used for comprehensive anti-infection, insecticide, antibacterial, antiviral, antispasmodic, strengthening, anti-inflammatory, analgesic, promoting scarring, and anti-oxidation. It can effectively inhibit dandruff and hair loss, and treat discomfort symptoms such as colds, coughs and sore throats. Thyme essential oil can improve the digestive system and gynecological diseases, promote blood circulation, enhance immunity, and relieve neuralgic pain. Thyme essential oil can help wound healing and treat eczema and acne skin. Thyme essential oil can activate brain cells, improve memory and attention, resist depression and soothe mental trauma, and strengthen nerves to prevent nightmares. The rich chemical components of thyme essential oil produce a variety of biological activities, with outstanding effects such as fragrance, moisturizing, whitening, acne removal, and anti-inflammatory, which can be used in the cosmetics field;

Oregano (Origanum vulgare L.) is a plant of the Lamiaceae family. Oregano essential oil is the most potent natural anti-inflammatory and antibacterial agent discovered by humans. It is extracted from oregano and has the effects of clearing heat, removing dampness, removing heat, relieving exterior symptoms, strengthening qi, anti-inflammatory, sterilizing, inhibiting bacteria, antiviral, antioxidant, and promoting digestion. Oregano essential oil is the most broad-spectrum antibacterial pure Chinese medicine additive for 31 common enteritis-causing bacteria and Shigella flexneri. It is an essential oil that can be called a "natural antibiotic". Studies have shown that it can even fight against a super Staphylococcus aureus (MRSA) that is currently ineffective against any antibiotics. Its antioxidant effect is better than many other herbs, 4 times that of blueberries, 12 times that of oranges, and 42 times that of apples. Traditional Chinese medicine believes that oregano is spicy, cool and non-toxic. The whole plant can be used as medicine, with the effects of clearing heat and relieving exterior symptoms, regulating qi and removing dampness, and diuresis and swelling. Modern medicine uses oregano essential oil as a herbal defense agent to resist fungi, viruses, bacteria and parasites, especially for intestinal diseases caused by E. coli, Salmonella, etc. Oregano essential oil is a powerful natural antibiotic. Oregano essential oil can treat colds and flu, relieve respiratory infections and mucositis; relieve asthma and cough symptoms, and is effective for chronic bronchitis; relieve gastrointestinal discomfort; fight viruses (skin infections/trauma), tuberculosis and plague, etc.; reduce inflammation and kill bacteria; is a natural analgesic, can relieve pain and toothache, chronic rheumatism, improve muscle pain; fight fungal infections; cleanse the blood, balance metabolism; stabilize emotions and enhance a sense of security;

Cinnamon (Cinnamomum cassia (L.) D. Don) is the dry bark and branch bark of the cinnamon plant of the Lauraceae family. According to the Compendium of Materia Medica, cinnamon has the effects of warming the middle and tonifying the kidney, dispelling cold and relieving pain. In the 15th and 16th centuries, cinnamon was one of the most precious spices, and it was even more valuable than gold at the time. In Egypt, people used the antiseptic properties of cinnamon to make mummies, and its aromatic properties were also used to make perfumes. The effects of cinnamon essential oil include antiseptic, antibacterial, analgesic, antioxidant, anti-inflammatory, antiviral, anti-rheumatic, antispasmodic, aphrodisiac, astringent, insecticidal, mood regulating, immune enhancing, memory improving, digestion promoting, and blood circulation promoting. Cinnamon essential oil is good for your health and can be used to treat respiratory problems, enhance cognitive function, improve skin health, etc. It can help relieve pain caused by headaches, dysmenorrhea, arthritis and other diseases. It has antioxidant activity and can remove free radicals. It can inhibit the release of inflammatory compounds by human cells, helping to reduce inflammation throughout the body, including joints, muscles and digestive system, to treat arthritis, Crohn's disease and ulcerative colitis, etc. It can be used for skin care, helping to reduce wrinkles and age spots, while balancing skin tone and making the skin tight and full of vitality. It helps to fight viral infections such as flu, rheumatism, warts, coughs and colds. It can help treat rheumatism. It can be used as an insect repellent. It improves mental state by increasing vitality, motivation and creativity, calms the mind by lifting mood and relieving mental fatigue, and helps reduce stress and fatigue. It is a good immune enhancer and improves immune deficiency problems. It can improve cognitive function and memory in patients with Alzheimer's disease. It improves indigestion problems. It promotes blood circulation, so that the body and hair get the oxygen, vitamins and minerals they need to maintain health. Cinnamon essential oil has the effect of removing pigmentation and can also achieve the purpose of whitening the skin. Cinnamon essential oil can be used in medicine, cosmetics, aromatherapy, food industry and other fields;

Clove (Eugenia caryophyllata Thunb.) is the dried flower bud of the Myrtaceae plant clove. It is mainly produced in Zanzibar, Madagascar, Sri Lanka, Indonesia, and also produced in Guangdong and Hainan, my country. Clove essential oil has a strong aroma, has anti-inflammatory, antibacterial, analgesic, and detumescent effects, can inhibit the growth of bacteria and microorganisms, can treat toothache, bronchitis, neuralgia, gastric acid, relieve the discomfort and pain caused by dysentery, improve weak constitution and anemia, promote blood circulation, and improve rough skin. Clove essential oil contains rich antioxidant ingredients, which can effectively resist the infringement of free radicals and delay aging. The ingredients such as eugenol and eugenol acid in clove essential oil have the effect of removing spots and whitening, which may lighten spots and brighten skin color. The ingredients such as eugenol and eugenol acid in clove essential oil also have the effect of cleaning pores, which can remove blackheads, acne, etc. Clove essential oil contains a variety of moisturizing ingredients, which can moisturize the skin and enhance the water retention capacity of the skin. Clove essential oil can also promote wound healing and has a certain therapeutic effect on skin diseases such as skin ulcers and scabies. With its antibacterial properties, clove essential oil can also be used to treat skin problems such as acne. Clove essential oil also has the effect of strengthening the stomach and relieving bloating, which can promote food digestion and absorption, relieve symptoms of hiccups, nausea, gastrointestinal bloating, and abdominal pain. Clove essential oil has a spicy aroma and has the effect of soothing the liver and regulating qi. It can cheer up the mood and relieve the chest discomfort caused by liver depression and qi stagnation.

The beneficial effects of the present invention are:

The present invention innovatively applies lignin extracted from fruit shells, which are a large amount of waste from the longan industry, to sunscreen skin care products, which not only reasonably utilizes the waste resources of the longan industry, but also makes some innovations in the field of sunscreen skin care products. The product is green and natural, highly safe, and has significant effects. With longan shell lignin composite sunscreen particles, natural moisturizers, and natural plant extracts as effective active ingredients, a sunscreen skin care product is prepared which has green and natural ingredients, little skin irritation, high safety, high comfort, moisturizing and whitening, anti-oxidation and anti-aging, and has excellent sunscreen and repair functions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of moisture retention rates of different embodiments;

FIG2 is a schematic diagram of the inhibition rate of tyrosinase activity in different embodiments;

FIG3 is a schematic diagram of the scavenging rate of DPPH free radicals in different embodiments;

FIG4 is a schematic diagram of the scavenging rate of ABTS free radicals in different embodiments;

FIG5 is a schematic diagram of the total reducing force of different embodiments;

FIG6 is a schematic diagram showing the inhibition rate of elastase activity in different embodiments;

FIG. 7 is a schematic diagram of light transmittance of different embodiments.

Detailed ways

The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and/or" used herein includes any and all combinations of one or more related listed items.

Embodiment 1:

A method for preparing a sunscreen skin care product comprises the following steps:

(1) Choline chloride and lactic acid (choline chloride: lactic acid = 1:7) are weighed in a beaker according to a certain molar mass ratio, and the mixture is placed in an oil bath and heated (85° C.) with stirring for reaction for 5 h. After the mixture is fully reacted to form a transparent uniform liquid, a choline chloride/lactic acid eutectic solvent is obtained, which is then taken out, cooled, sealed and stored for later use;

(2) After washing the longan shell, dry it at 85°C for 20h, crush it with a pulverizer and pass it through a 100-mesh sieve. The obtained longan shell powder is put into a sealed bag and placed in a desiccator for standby use; weigh the longan shell powder, fully mix it with a low eutectic solvent (DES) according to a certain solid-liquid ratio (g/mL) (longan shell powder: DES = 1:15), place it in an oil bath pot, heat (100°C) and stir to react for 11h, cool it and centrifuge it; pour the supernatant into a beaker, pour the residue into a Buchner funnel and wash it with anhydrous ethanol by suction for 4 times, combine the filtrates obtained by filtration and evaporate the ethanol with a rotary evaporator to obtain a concentrated solution, then combine the supernatant and the concentrated solution and slowly add it into 5L deionized water and stir it for 18min, let it stand for 12h, and then centrifuge it (10000r/min, 24min) to separate the solid precipitate; the obtained solid precipitate is dried in an oven at 82°C for 24h, and the obtained black solid is the longan shell lignin;

(3) Weigh 10 parts of longan shell lignin and disperse them in 90 parts of deionized water, slowly drop a 12% NaOH solution while stirring, adjust the pH value of the solution system to 9.2, and then continue to stir for 11 minutes to uniformly disperse the longan shell lignin in the deionized water to prepare a 10% longan shell lignin solution; weigh 10 parts of sodium alginate and disperse them in 90 parts of deionized water, slowly drop a 12% NaOH solution while stirring, adjust the pH value of the solution system to 8.2, and then continue to stir for 13 minutes to uniformly disperse the sodium alginate in the deionized water to prepare a 10% sodium alginate solution;

(4) Accurately measure the prepared 10% longan shell lignin solution, 10% sodium alginate solution, and eucalyptus essential oil with sunscreen and repair effects in a certain volume ratio (longan shell lignin solution: sodium alginate solution: eucalyptus essential oil = 10:10:1) and add them into a beaker, disperse them with an ultrasonic crusher for 6 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it 3 times to remove the alkalinity (10000r/min, 20min), and then vacuum freeze-dry it for 50h to obtain longan shell lignin/sodium alginate/eucalyptus essential oil composite sunscreen particles.

(5) Weigh 0.8 parts of carbomer and add it to 26 parts of deionized water, heat (86° C.) and stir until fully dissolved to obtain a carbomer solution;

(6) Weigh 0.4 parts of allantoin and add it to 10 parts of deionized water, heat (80° C.) and stir until fully dissolved to obtain an allantoin solution (this moisturizer is soluble in hot water and slightly soluble in water and needs to be heated and dissolved separately);

(7) The carbomer solution is cooled to about 46° C., and the prepared allantoin solution, 1.6 parts of triethanolamine, 5 parts of longan shell lignin/sodium alginate/eucalyptus essential oil composite sunscreen particles, 5 parts of glycine, 2 parts of cucumber extract, 2 parts of turmeric extract, 0.8 parts of thyme essential oil, 0.7 parts of cinnamon essential oil, and 45.7 parts of water are added thereto, and the mixture is stirred evenly with a magnetic stirrer, sterilized at high static pressure for 9 minutes (450 MPa), and bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions.

Embodiment 2:

A method for preparing a sunscreen skin care product comprises the following steps:

(1) Choline chloride and lactic acid (choline chloride: lactic acid = 1:9) are weighed in a beaker according to a certain molar mass ratio, and the mixture is placed in an oil bath and heated (95° C.) with stirring for reaction for 3 h. After the mixture is fully reacted to form a transparent uniform liquid, the choline chloride/lactic acid eutectic solvent is obtained, which is then taken out, cooled, sealed and stored for later use;

(2) After washing the longan shell, dry it at 80°C for 24h, crush it with a pulverizer and pass it through a 100-mesh sieve. The obtained longan shell powder is put into a sealed bag and placed in a desiccator for standby use; weigh the longan shell powder, fully mix it with a low eutectic solvent (DES) according to a certain solid-liquid ratio (g/mL) (longan shell powder: DES = 1:30), place it in an oil bath pot, heat (120°C), stir and react for 9h, cool and centrifuge; pour the supernatant into a beaker, pour the residue into a Buchner funnel and wash it with anhydrous ethanol by suction for 5 times, combine the filtrates obtained by filtration and evaporate the ethanol with a rotary evaporator to obtain a concentrated solution, then combine the supernatant and the concentrated solution, slowly add it into 6L deionized water and stir it for 25min, let it stand for 12h, and then centrifuge (10000r/min, 30min) to separate the solid precipitate; the obtained solid precipitate is dried in an oven at 90°C for 24h, and the obtained black solid is the longan shell lignin;

(3) Weigh 20 parts of longan shell lignin and disperse them in 80 parts of deionized water, slowly drop a 18% NaOH solution while stirring, adjust the pH value of the solution system to 9.4, and then continue to stir for 15 minutes to evenly disperse the longan shell lignin in the deionized water to prepare a 20% longan shell lignin solution; weigh 20 parts of sodium alginate and disperse them in 80 parts of deionized water, slowly drop a 18% NaOH solution while stirring, adjust the pH value of the solution system to 8.4, and then continue to stir for 14 minutes to evenly disperse the sodium alginate in the deionized water to prepare a 20% sodium alginate solution;

(4) Accurately measure the prepared 20% longan shell lignin solution, 20% sodium alginate solution, and niacin essential oil with sunscreen effect, add them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: niacin essential oil = 5:5:1), disperse them with an ultrasonic crusher for 8 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it 3 times to remove the alkalinity (10000r/min, 22min), and then vacuum freeze-dry it for 60h to obtain a longan shell lignin/sodium alginate/niacin essential oil composite. Composite sunscreen particles; accurately measuring the prepared 20% longan shell lignin solution, 20% sodium alginate solution, and frankincense essential oil with repairing effect, adding them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: frankincense essential oil = 5:5:1), dispersing them with an ultrasonic crusher for 8 minutes, taking the upper white emulsion, washing it with deionized water and centrifuging it for 3 times to remove alkalinity (10000r/min, 22min), and then vacuum freeze-drying it for 60h to obtain longan shell lignin/sodium alginate/frankincense essential oil composite sunscreen particles;

(5) Weigh 0.6 parts of carbomer and add it to 22 parts of deionized water, heat (82° C.) and stir until fully dissolved to obtain a carbomer solution;

(6) Weigh 1.5 parts of sodium hyaluronate and add it to 25 parts of deionized water, stirring until fully dissolved to obtain a sodium hyaluronate solution (this moisturizer is easy to agglomerate when added to water and requires long-term stirring to completely dissolve, so it needs to be dissolved separately);

(7) The carbomer solution is cooled to about 42° C., and the prepared sodium hyaluronate solution, 1.2 parts of triethanolamine, 6 parts of longan shell lignin/sodium alginate/melaleuca alternifolia essential oil composite sunscreen particles, 4 parts of longan shell lignin/sodium alginate/frankincense essential oil composite sunscreen particles, 2 parts of serine, 2 parts of saffron extract, 1 part of cinnamon essential oil, 1 part of clove essential oil, and 33.7 parts of water are added thereto. The mixture is stirred evenly with a magnetic stirrer, sterilized at high static pressure for 5 min (600 MPa), and bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions.

Embodiment 3:

A method for preparing a sunscreen skin care product comprises the following steps:

(1) Weigh choline chloride and lactic acid (choline chloride: lactic acid = 1:10) in a certain molar mass ratio and put them into a beaker, place it in an oil bath and heat (100° C.) and stir to react for 2 h. After sufficient reaction to form a transparent uniform liquid, a choline chloride/lactic acid low eutectic solvent is obtained, which is taken out, cooled, sealed and stored for later use;

(2) After washing the longan shell, dry it at 90°C for 12h, crush it with a pulverizer and pass it through a 100-mesh sieve. The obtained longan shell powder is put into a sealed bag and placed in a desiccator for standby use; weigh the longan shell powder, fully mix it with a low eutectic solvent (DES) according to a certain solid-liquid ratio (g/mL) (longan shell powder: DES = 1:25), place it in an oil bath pot, heat (140°C) and stir to react for 8h, cool it and centrifuge it; pour the supernatant into a beaker, pour the residue into a Buchner funnel and wash it with anhydrous ethanol by suction for 5 times, combine the filtrates obtained by filtration and evaporate the ethanol with a rotary evaporator to obtain a concentrated solution, then combine the supernatant and the concentrated solution and slowly add it into 6L deionized water and stir it for 22min, let it stand for 12h, and then centrifuge it (10000r/min, 28min) to separate the solid precipitate; the obtained solid precipitate is dried in an oven at 85°C for 24h, and the obtained black solid is the longan shell lignin;

(3) Weigh 12 parts of longan shell lignin and disperse them in 88 parts of deionized water, slowly drop a 20% NaOH solution while stirring, adjust the pH value of the solution system to 9.4, and then continue to stir for 14 minutes to evenly disperse the longan shell lignin in the deionized water to prepare a 12% longan shell lignin solution; weigh 12 parts of sodium alginate and disperse them in 88 parts of deionized water, slowly drop a 20% NaOH solution while stirring, adjust the pH value of the solution system to 8.5, and then continue to stir for 12 minutes to evenly disperse the sodium alginate in the deionized water to prepare a 12% sodium alginate solution;

(4) Accurately measure the prepared 12% longan shell lignin solution, 12% sodium alginate solution, and pine red plum essential oil with sunscreen and repair effects, add them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: pine red plum essential oil = 6:5:1), disperse them with an ultrasonic crusher for 7 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it 3 times to remove the alkalinity (10000r/min, 30min), and then vacuum freeze-dry it for 72h to obtain longan shell lignin/sodium alginate/pine red plum essential oil composite sunscreen particles;

(5) Weigh 0.7 parts of carbomer and add it to 24 parts of deionized water, heat (84° C.) and stir until fully dissolved to obtain a carbomer solution;

(6) Weigh 0.6 parts of allantoin and add it to 10 parts of deionized water, heat (85° C.) and stir until fully dissolved to obtain an allantoin solution (this moisturizer is soluble in hot water and slightly soluble in water and needs to be heated and dissolved separately);

(7) The carbomer solution is cooled to about 50° C., and the prepared allantoin solution, 1.4 parts of triethanolamine, 5 parts of longan shell lignin/sodium alginate/pine red plum essential oil composite sunscreen particles, 2 parts of serine, 3 parts of cucumber extract, 2 parts of marigold extract, 0.9 parts of cinnamon essential oil, 0.5 parts of oregano essential oil, and 49.9 parts of water are added thereto, and the mixture is stirred evenly with a magnetic stirrer, sterilized at high static pressure for 7 minutes (550 MPa), and bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions.

Embodiment 4:

A method for preparing a sunscreen skin care product comprises the following steps:

(1) Choline chloride and lactic acid (choline chloride: lactic acid = 1:5) are weighed in a beaker according to a certain molar mass ratio, and the mixture is placed in an oil bath and heated (82° C.) with stirring for 6 h. After the mixture is fully reacted to form a transparent uniform liquid, the choline chloride/lactic acid eutectic solvent is obtained, which is then taken out, cooled, sealed and stored for later use;

(2) After washing the longan shell, dry it at 82°C for 22 hours, crush it with a pulverizer and pass it through a 100-mesh sieve. The obtained longan shell powder is put into a sealed bag and placed in a desiccator for standby use; weigh the longan shell powder, fully mix it with a low eutectic solvent (DES) according to a certain solid-liquid ratio (g/mL) (longan shell powder: DES = 1:20), place it in an oil bath, heat (110°C), stir and react for 10 hours, and centrifuge it after cooling; pour the supernatant into a beaker, pour the residue into a Buchner funnel and wash it with anhydrous ethanol by suction for 4 times, combine the filtrates obtained by filtration, evaporate the ethanol with a rotary evaporator, and obtain a concentrated solution, then combine the supernatant and the concentrated solution, slowly add it into 5L deionized water, stir it for 20 minutes, let it stand for 12 hours, and then centrifuge it (10000r/min, 26min) to separate the solid precipitate; the obtained solid precipitate is dried in an oven at 84°C for 24 hours, and the obtained black solid is the longan shell lignin;

(3) Weigh 18 parts of longan shell lignin and disperse them in 82 parts of deionized water, slowly drop a 10% NaOH solution while stirring, adjust the pH value of the solution system to 9.2, and continue stirring for 10 minutes to uniformly disperse the longan shell lignin in the deionized water to prepare a longan shell lignin solution with a concentration of 18%; Weigh 18 parts of sodium alginate and disperse them in 82 parts of deionized water, slowly drop a 10% NaOH solution while stirring, adjust the pH value of the solution system to 8.2, and continue stirring for 15 minutes to uniformly disperse the sodium alginate in the deionized water to prepare a sodium alginate solution with a concentration of 18%;

(4) Accurately measure the prepared 18% longan shell lignin solution, 18% sodium alginate solution, and eucalyptus essential oil with sunscreen and repair effects, add them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: eucalyptus essential oil = 8:8:1), disperse them with an ultrasonic crusher for 9 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it 3 times to remove the alkalinity (10000r/min, 24min), and then vacuum freeze-dry for 48h to obtain a longan shell lignin/sodium alginate/eucalyptus essential oil composite. Sunscreen particles: accurately measure the prepared 18% longan shell lignin solution, 18% sodium alginate solution, and sandalwood essential oil with repair effect, add them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: sandalwood essential oil = 7:6:1), disperse them with an ultrasonic crusher for 9 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it for 3 times to remove alkalinity (10000r/min, 24min), and then vacuum freeze-dry for 48h to obtain longan shell lignin/sodium alginate/sandalwood essential oil composite sunscreen particles;

(5) Weigh 0.9 parts of carbomer and add it to 28 parts of deionized water, heat (88° C.) and stir until fully dissolved to obtain a carbomer solution;

(6) Weigh 1 part of sodium hyaluronate and add it to 20 parts of deionized water, stirring until fully dissolved to obtain a sodium hyaluronate solution (this moisturizer is easy to agglomerate when added to water and requires long-term stirring to be completely dissolved, so it needs to be dissolved separately);

(7) The carbomer solution is cooled to about 40° C., and the prepared sodium hyaluronate solution, 1.8 parts of triethanolamine, 4 parts of longan shell lignin/sodium alginate/eucalyptus essential oil composite sunscreen particles, 3 parts of longan shell lignin/sodium alginate/sandalwood essential oil composite sunscreen particles, 5 parts of glycine, 3 parts of marigold extract, 1 part of turmeric extract, 0.8 parts of clove essential oil, 0.5 parts of thyme essential oil, and 31 parts of water are added thereto. The mixture is stirred evenly with a magnetic stirrer, sterilized at high static pressure for 6 minutes (580 MPa), and bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions.

Embodiment 5:

A method for preparing a sunscreen skin care product comprises the following steps:

(1) Choline chloride and lactic acid (choline chloride: lactic acid = 1:8) are weighed in a beaker according to a certain molar mass ratio, and the mixture is placed in an oil bath and heated (90° C.) and stirred for reaction for 4 h. After the mixture is fully reacted to form a transparent uniform liquid, a choline chloride/lactic acid eutectic solvent is obtained, which is then taken out, cooled, sealed and stored for later use;

(2) After washing the longan shell, dry it at 86°C for 18h, crush it with a pulverizer and pass it through a 100-mesh sieve. The obtained longan shell powder is put into a sealed bag and placed in a desiccator for standby use; weigh the longan shell powder, fully mix it with a low eutectic solvent (DES) according to a certain solid-liquid ratio (g/mL) (longan shell powder: DES = 1:10), place it in an oil bath pot, heat (90°C) and stir to react for 12h, cool it and centrifuge it; pour the supernatant into a beaker, pour the residue into a Buchner funnel and wash it with anhydrous ethanol by suction for 3 times, combine the filtrates obtained by filtration and evaporate the ethanol with a rotary evaporator to obtain a concentrated solution, then combine the supernatant and the concentrated solution and slowly add it into 4L deionized water and stir it for 15min, let it stand for 12h, and then centrifuge it (10000r/min, 20min) to separate the solid precipitate; the obtained solid precipitate is dried in an oven at 80°C for 24h, and the obtained black solid is the longan shell lignin;

(3) Weigh 16 parts of longan shell lignin and disperse them in 84 parts of deionized water, slowly drop a 14% NaOH solution while stirring, adjust the pH value of the solution system to 9.3, and then continue to stir for 12 minutes to evenly disperse the longan shell lignin in the deionized water to prepare a 16% longan shell lignin solution; weigh 16 parts of sodium alginate and disperse them in 84 parts of deionized water, slowly drop a 14% NaOH solution while stirring, adjust the pH value of the solution system to 8.3, and then continue to stir for 11 minutes to evenly disperse the sodium alginate in the deionized water to prepare a 16% sodium alginate solution;

(4) Accurately measure the prepared 16% longan shell lignin solution, 16% sodium alginate solution, and pine red plum essential oil with sunscreen and repair effects, add them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: pine red plum essential oil = 7:7:1), disperse them with an ultrasonic crusher for 10 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it 3 times to remove the alkalinity (10000r/min, 26min), and then vacuum freeze-dry for 65h to obtain longan shell lignin/sodium alginate/pine red plum essential oil composite sunscreen. Particles; accurately measure the prepared 16% longan shell lignin solution, 16% sodium alginate solution, and geranium essential oil with repair effect, add them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: geranium essential oil = 8:5:1), disperse them with an ultrasonic crusher for 10 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it 3 times to remove the alkalinity (10000r/min, 26min), and then vacuum freeze-dry for 65h to obtain longan shell lignin/sodium alginate/geranium essential oil composite sunscreen particles;

(5) Weigh 1 part of carbomer and add it to 30 parts of deionized water, heat (90° C.) and stir until fully dissolved to obtain a carbomer solution;

(6) The carbomer solution is cooled to about 48° C., and 2 parts of triethanolamine, 4 parts of longan shell lignin/sodium alginate/pine red plum essential oil composite sunscreen particles, 2 parts of longan shell lignin/sodium alginate/geranium essential oil composite sunscreen particles, 5 parts of glycine, 2 parts of serine, 1 part of saffron extract, 4 parts of cucumber extract, 0.6 parts of thyme essential oil, 0.6 parts of oregano essential oil, and 47.8 parts of water are added thereto, and the mixture is stirred evenly with a magnetic stirrer, sterilized at high static pressure for 10 min (400 MPa), and bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions.

Embodiment 6:

A method for preparing a sunscreen skin care product comprises the following steps:

(1) Choline chloride and lactic acid (choline chloride: lactic acid = 1:6) are weighed in a beaker according to a certain molar mass ratio, and the mixture is placed in an oil bath and heated (80° C.) with stirring for 6 h. After the mixture is fully reacted to form a transparent uniform liquid, a choline chloride/lactic acid eutectic solvent is obtained, which is then taken out, cooled, sealed and stored for later use;

(2) After washing the longan shell, dry it at 88°C for 16h, crush it with a pulverizer and pass it through a 100-mesh sieve. The obtained longan shell powder is put into a sealed bag and placed in a desiccator for standby use; weigh the longan shell powder, fully mix it with a low eutectic solvent (DES) according to a certain solid-liquid ratio (g/mL) (longan shell powder: DES = 1:12), place it in an oil bath pot, heat (150°C) and stir to react for 6h, cool it and centrifuge it; pour the supernatant into a beaker, pour the residue into a Buchner funnel and wash it with anhydrous ethanol by suction for 3 times, combine the filtrates obtained by filtration and evaporate the ethanol with a rotary evaporator to obtain a concentrated solution, then combine the supernatant and the concentrated solution and slowly add it into 4L deionized water and stir it for 16min, let it stand for 12h, and then centrifuge it (10000r/min, 22min) to separate the solid precipitate; the obtained solid precipitate is dried in an oven at 88°C for 24h, and the obtained black solid is the longan shell lignin;

(3) Weigh 15 parts of longan shell lignin and disperse them in 85 parts of deionized water, slowly drop a 16% NaOH solution while stirring, adjust the pH value of the solution system to 9.3, and then continue to stir for 13 minutes to uniformly disperse the longan shell lignin in the deionized water to prepare a 15% longan shell lignin solution; weigh 15 parts of sodium alginate and disperse them in 85 parts of deionized water, slowly drop a 16% NaOH solution while stirring, adjust the pH value of the solution system to 8.3, and then continue to stir for 10 minutes to uniformly disperse the sodium alginate in the deionized water to prepare a 15% sodium alginate solution;

(4) Accurately measure the prepared 15% longan shell lignin solution, 15% sodium alginate solution, and niacin essential oil with sunscreen effect, add them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: niacin essential oil = 9:8:1), disperse them with an ultrasonic crusher for 5 minutes, take the upper white emulsion, wash it with deionized water and centrifuge it 3 times to remove the alkalinity (10000r/min, 28min), and then vacuum freeze-dry it for 55h to obtain a longan shell lignin/sodium alginate/niacin essential oil composite. Composite sunscreen particles; accurately measuring the prepared 15% longan shell lignin solution, 15% sodium alginate solution, and sandalwood essential oil with repairing effect, adding them into a beaker according to a certain volume ratio (longan shell lignin solution: sodium alginate solution: sandalwood essential oil = 6:8:1), dispersing them with an ultrasonic crusher for 5 minutes, taking the upper white emulsion, washing it with deionized water and centrifuging it for 3 times to remove alkalinity (10000r/min, 28min), and then vacuum freeze-drying it for 55h to obtain longan shell lignin/sodium alginate/sandalwood essential oil composite sunscreen particles;

(5) Weigh 0.5 parts of carbomer and add it to 20 parts of deionized water, heat (80° C.) and stir until fully dissolved to obtain a carbomer solution;

(6) Weigh 0.8 parts of allantoin and add it to 10 parts of deionized water, heat (90° C.) and stir until fully dissolved to obtain an allantoin solution (this moisturizer is soluble in hot water and slightly soluble in water, and needs to be heated and dissolved separately);

(7) Weigh 2 parts of sodium hyaluronate and add it to 30 parts of deionized water, stirring until fully dissolved to obtain a sodium hyaluronate solution (this moisturizer is easy to agglomerate when added to water and requires long-term stirring to be completely dissolved, so it needs to be dissolved separately);

(8) The carbomer solution is cooled to about 44° C., and the prepared allantoin solution and sodium hyaluronate solution, 1 part of triethanolamine, 5 parts of longan shell lignin/sodium alginate/melaleuca alternifolia essential oil composite sunscreen particles, 4 parts of longan shell lignin/sodium alginate/sandalwood essential oil composite sunscreen particles, 1 part of saffron extract, 1 part of marigold extract, 1 part of cucumber extract, 1 part of oregano essential oil, and 22.7 parts of water are added thereto. The mixture is stirred evenly with a magnetic stirrer, sterilized at high static pressure for 8 min (500 MPa), and bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions.

Comparative Example 1:

The only difference between this comparative example and Example 1 is that the longan shell lignin composite sunscreen particles are replaced with a physical sunscreen agent or a chemical sunscreen agent, wherein the physical sunscreen agent is any one of titanium dioxide and zinc oxide or a mixture thereof; the chemical sunscreen agent is any one of octocrylene, homosalate, ethylhexyl methoxycinnamate, butyl methoxydibenzoylmethane or a mixture thereof, specifically, the particles in this comparative example contain 2 parts of titanium dioxide + 3 parts of octocrylene + 4 parts of plant extracts.

Comparative Example 2:

The only difference between this comparative example and Example 2 is that the longan shell lignin composite sunscreen particles are replaced with a physical sunscreen agent or a chemical sunscreen agent, wherein the physical sunscreen agent is any one of titanium dioxide and zinc oxide or a mixture thereof; the chemical sunscreen agent is any one of octocrylene, homosalate, ethylhexyl methoxycinnamate, and butyl methoxydibenzoylmethane or a mixture thereof, specifically, the particles in this comparative example contain 4 parts of zinc oxide + 3 parts of ethylhexyl methoxycinnamate + 3 parts of butyl methoxydibenzoylmethane + 2 parts of plant extracts.

Comparative Example 3:

The only difference between this comparative example and Example 3 is that the longan shell lignin composite sunscreen particles are replaced with a physical sunscreen agent or a chemical sunscreen agent, wherein the physical sunscreen agent is any one of titanium dioxide and zinc oxide or a mixture thereof; the chemical sunscreen agent is any one of octocrylene, homosalate, ethylhexyl methoxycinnamate, and butyl methoxydibenzoylmethane or a mixture thereof. Specifically, the particles in this comparative example contain 3 parts of titanium dioxide + 2 parts of homosalate + 5 parts of plant extracts.

Comparative Example 4:

The only difference between this comparative example and Example 4 is that the longan shell lignin composite sunscreen particles are replaced with a physical sunscreen agent or a chemical sunscreen agent, wherein the physical sunscreen agent is any one of titanium dioxide and zinc oxide or a mixture thereof; the chemical sunscreen agent is any one of octocrylene, homosalate, ethylhexyl methoxycinnamate, and butyl methoxydibenzoylmethane or a mixture thereof, specifically, the particles in this comparative example contain 3 parts of zinc oxide + 4 parts of ethylhexyl methoxycinnamate + 4 parts of plant extracts.

Comparative Example 5:

The only difference between this comparative example and Example 5 is that the longan shell lignin composite sunscreen particles are replaced with a physical sunscreen agent or a chemical sunscreen agent, wherein the physical sunscreen agent is any one of titanium dioxide and zinc oxide or a mixture thereof; the chemical sunscreen agent is any one of octocrylene, homosalate, ethylhexyl methoxycinnamate, butyl methoxydibenzoylmethane or a mixture thereof, specifically, the particles in this comparative example contain 3 parts of zinc oxide + 3 parts of octocrylene + 5 parts of plant extracts.

Comparative Example 6:

The only difference between this comparative example and Example 6 is that the longan shell lignin composite sunscreen particles are replaced with a physical sunscreen agent or a chemical sunscreen agent, wherein the physical sunscreen agent is any one of titanium dioxide and zinc oxide or a mixture thereof; the chemical sunscreen agent is any one of octocrylene, homosalate, ethylhexyl methoxycinnamate, and butyl methoxydibenzoylmethane or a mixture thereof. Specifically, the particles in this comparative example contain 2 parts of titanium dioxide + 2 parts of zinc oxide + 5 parts of homosalate + 3 parts of plant extracts.

Beneficial Effects

(1) Sensory evaluation

A total of 120 volunteers were selected, numbered 1-120, all of whom were female, and their facial skin had the following conditions to varying degrees: skin redness, itching, swelling, stinging, dryness and tightness, scaling, sunburn freckles, spots, etc. The sunscreen skin care products prepared by the present invention were used 2-3 times a day, wherein No. 1-20 used the product of Example 1, No. 21-40 used the product of Example 2, No. 41-60 used the product of Example 3, No. 61-80 used the product of Example 4, No. 81-100 used the product of Example 5, and No. 101-120 used the product of Example 6.

One month after the experiment, the comprehensive condition of the subjects' facial skin was assessed, and it was found that no subjects had any adverse skin reactions, and their facial skin had improved: redness, itching, swelling, and tingling of the skin were repaired; sunburned, tanned, and dull skin became fairer; freckles and spots were reduced or disappeared; the skin was no longer dry, tight, or flaky, and became more delicate and lustrous, with fine lines reduced and smoothed, and more hydrated and plump.

Each embodiment in this specification focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will comply with the widest range consistent with the principles and novel features disclosed herein.

(2) Moisturizing effect

A saturated calcium chloride solution was prepared and placed in a desiccator to control the humidity at 31%, and the indoor temperature was maintained at 25° C. A layer of medical breathable tape was pasted on the glass plate and its mass was accurately weighed, and then the sunscreen skin care product sample was evenly applied on the surface of the medical breathable tape, weighed and immediately placed in a desiccator with a saturated calcium chloride solution, and weighed every 2, 4, 6, 8, 10, and 12 hours to calculate its water holding capacity, that is, the moisture retention rate. The moisture retention rates of various embodiments over time are shown in FIG1 .

M _t : mass of the sample after placement for th, g; M ₀ : mass of the sample before placement, g.

As shown in Figure 1, the moisturizing rate of each embodiment shows a downward trend as time goes by. The order of moisturizing effect is: Example 5> Example 4> Example 1> Example 2> Example 6> Example 3, among which Example 5 has the strongest moisturizing effect, followed by Example 4 (both groups contain more natural moisturizers). The moisturizing effect of Examples 1-6 is proportional to the moisturizer content. The higher the moisturizer content, the better the moisturizing effect. And the moisturizing rate of each embodiment at 12h is >50%, indicating that each embodiment has a strong moisturizing effect and can keep the skin moist for a long time.

(3) Whitening effect

Tyrosinase is an oxidase and a rate-limiting enzyme that regulates melanin production. Because tyrosinase is a key enzyme in the formation of melanin, the better the inhibition of tyrosinase, the more obvious the whitening effect. The present invention mainly evaluates the whitening effect of sunscreen skin care products by measuring the inhibition rate of tyrosinase activity, and the specific data are shown in Figure 2.

The ingredients in the formula of the present invention all have multiple functions, and the ingredients with whitening function include: sodium alginate, niacinamide essential oil, eucalyptus essential oil, frankincense essential oil, sandalwood essential oil, carbomer, triethanolamine, serine, sodium hyaluronate, allantoin, turmeric extract, cucumber extract, saffron extract, marigold extract, thyme essential oil, cinnamon essential oil, clove essential oil, etc.

As shown in Figure 2, the order of whitening efficacy is: Example 2> Example 5> Example 6> Example 4> Example 3> Example 1> Vc, among which Example 2 has the strongest whitening efficacy, followed by Example 5, and Example 6 (these three groups all contain relatively more whitening ingredients). The whitening efficacy of Examples 1-6 is proportional to the content of the whitening ingredients. The higher the content of the whitening ingredients, the higher the inhibition rate of tyrosinase activity, and the better the whitening efficacy. The inhibition rate of tyrosinase activity of each example is >51%, which is much higher than the positive control Vc, indicating that each example has a strong whitening efficacy.

(4) Antioxidant and anti-aging effects

As people age, the human body ages. As the largest immune organ in the human body, the skin weakens in function, leading to various skin problems. Due to aging, the number of fibroblasts decreases, reducing the ability to synthesize collagen and elastin, and the skin loses elasticity; the expression of proteolytic enzymes in the dermis increases, accelerating the decomposition of collagen and extracellular matrix, causing the skin to sag and form wrinkles; the number of Langerhans cells in the skin decreases, and the immune function and barrier function of the skin are both reduced; in addition, due to environmental factors such as light and pollution, the skin is accelerated to oxidize and form spots. For the aging problem of the skin, skin aging can be delayed by improving antioxidant activity, promoting cell metabolism, regulating immune function, repairing collagen, repairing DNA damage, and other ways. Studies have shown that both DPPH free radicals and ABTS free radicals have a good correlation with antioxidant activity. The present invention mainly evaluates its antioxidant activity through experiments of removing DPPH free radicals and ABTS free radicals and measuring total reducing power of sunscreen skin care products. The specific data are shown in Figures 3-5.

The ingredients in the formula of the present invention all have multiple functions, and the ingredients with antioxidant effect include: sodium alginate, niaouli essential oil, eucalyptus essential oil, rhododendron essential oil, geranium essential oil, frankincense essential oil, sandalwood essential oil, carbomer, triethanolamine, glycine, serine, sodium hyaluronate, allantoin, turmeric extract, cucumber extract, saffron extract, marigold extract, thyme essential oil, oregano essential oil, cinnamon essential oil, clove essential oil, etc.

As can be seen from Figure 3, the order of scavenging rate of the examples for DPPH free radicals is: Example 5> Example 4> Example 2> Example 1> Example 6> Example 3> Vc, among which Example 5 has the strongest scavenging rate for DPPH free radicals, followed by Example 4 (both groups contain more antioxidant ingredients).

As can be seen from Figure 4, the order of the scavenging rates of the examples for ABTS free radicals is: Example 5> Example 4> Example 2> Example 1> Example 6> Example 3> Vc, among which Example 5 has the strongest scavenging rate for ABTS free radicals, followed by Example 4 (both groups contain more antioxidant ingredients).

As can be seen from FIG5 , the order of total reducing power of the embodiments is: Embodiment 5> Embodiment 4> Embodiment 2> Embodiment 1> Embodiment 6> Embodiment 3> Vc, among which Embodiment 5 has the strongest total reducing power, followed by Embodiment 4 (both groups contain more antioxidant components).

As shown in Figures 3-5, the antioxidant effect of Examples 1-6 is proportional to the content of antioxidant components therein. The higher the content of antioxidant components, the stronger the scavenging rate of DPPH free radicals, the scavenging rate of ABTS free radicals and the total reducing power, and the better the antioxidant effect. The scavenging rate of DPPH free radicals of each example is >55%, the scavenging rate of ABTS free radicals is >61%, and the total reducing power is >0.61, which is much higher than the positive control Vc, indicating that each example has a strong antioxidant effect.

Elastase, as a proteolytic enzyme with extremely high selectivity and specificity, has the effect of catalytic hydrolysis to many amino acids such as carboxyl-containing polypeptide bonds such as glycine, leucine, alanine, valine, and can decompose the elastin in connective tissue protein. Elastase inhibitors can effectively inhibit elastase activity, slow down the degradation rate of elastin, and play the effect of delaying aging and reducing wrinkles. Therefore, the present invention mainly evaluates its anti-aging effect by measuring the inhibition rate of elastase activity in sunscreen skin care products, and specific data are as shown in Figure 6.

The ingredients in the formula of the present invention all have multiple functions, and the ingredients with anti-aging effects include: sodium alginate, niaouli essential oil, eucalyptus essential oil, rhododendron essential oil, geranium essential oil, frankincense essential oil, sandalwood essential oil, carbomer, triethanolamine, glycine, serine, sodium hyaluronate, allantoin, turmeric extract, cucumber extract, saffron extract, marigold extract, thyme essential oil, oregano essential oil, cinnamon essential oil, clove essential oil, etc.

As shown in Figure 6, the order of the inhibition rate of the examples on the activity of elastase is: Example 5> Example 4> Example 2> Example 1> Example 6> Example 3> Vc, among which the strongest inhibition rate on the activity of elastase is Example 5, followed by Example 4, and the third is Example 2 (these three groups all contain more anti-aging ingredients). The strength of the anti-aging effect of Examples 1-6 is proportional to the content of the anti-aging ingredients therein. The higher the content of the anti-aging ingredients, the stronger the inhibition rate on the activity of elastase, and the better the anti-aging effect. And the inhibition rate of each example on the activity of elastase is all> 56%, which is much higher than the positive control Vc, indicating that each example has a strong antioxidant effect.

(5) Sun protection effect

Cut the medical breathable tape into strips of 1.0cm×4.0cm, and stick it to the surface of one side of the 1.0cm absorption cell and weigh it accurately. Evenly apply the sunscreen skin care product sample on the surface of the tape and weigh it accurately with a 1/10,000 balance. Prepare 3 parallel samples for each sample to be tested. According to the above steps, prepare 2 blank absorption cells with medical breathable tape but no sample applied, and place them in the light path as a baseline to adjust the instrument zero point. All the above samples are placed at room temperature (25°C) for 30 minutes to be tested (the transmittance value measured after the sample is applied and placed for 30 minutes to form a film is compared with the direct test value, and the effect is significantly better than the latter and has good reproducibility). Use a UV-visible spectrophotometer to measure the transmittance of the above samples at 280-400nm, and calculate the average value of the measured values of the parallel samples. The results can be used as the sunscreen effect evaluation of the corresponding samples. The specific results are shown in Figure 7.

The wavelength of ultraviolet rays is between 280-400nm, and the lower the transmittance, the better the effect of preventing long-wave ultraviolet rays UVA and medium-wave ultraviolet rays UVB, and the higher the sun protection factor. As can be seen from Figure 7, the order of transmittance is: titanium dioxide>zinc oxide>titanium dioxide+zinc oxide>Example 3>Example 1>Example 5>Example 4>Example 6>Example 2, and the strength of the sunscreen effect is inversely proportional to the transmittance. Therefore, the order of the strength of the sunscreen effect is: Example 2>Example 6>Example 4>Example 5>Example 1>Example 3>Titanium dioxide+zinc oxide>Zinc oxide>Titanium dioxide, among which the best sunscreen effect is Example 2, followed by Example 6, and the third is Example 4 (all three groups contain more longan shell lignin composite sunscreen particles). The strength of the sunscreen effect of Examples 1-6 is proportional to the content of the sunscreen ingredients therein. The higher the content of the longan shell lignin composite sunscreen particles, the stronger the sunscreen effect. The transmittance of different sunscreens in the positive control group is much higher than that in the examples, that is, the sunscreen effect of the positive control group is much lower than that in the examples, indicating that the sunscreen skin care products prepared by the present invention and containing longan shell lignin composite sunscreen particles are much stronger than general sunscreens in sunscreen effect.

(6) After-sun repair effect

UVA and UVB are the main UV rays that are harmful to the skin. UVA (315-400nm) is a long-wave ultraviolet light that causes the skin to tan and age; UVB (280-315nm) is a medium-wave ultraviolet light that causes the skin to sunburn and become red; when human skin is exposed to excessive UVA and UVB, it will cause cells to release inflammatory mediators, leading to dilation and congestion of dermal capillaries, edema of subcutaneous tissues and inflammation, and the skin will show symptoms such as redness, itching, swelling, stinging, dryness, desquamation, freckles and spots. Under the strong irradiation of sunlight, even if sun protection measures are taken, it is impossible to completely avoid the damage of ultraviolet rays, so it is particularly important to repair the skin after sun exposure. Therefore, in addition to the sun protection effect, the repair effect of sunscreen skin care products is also indispensable. Ultraviolet rays damage the skin, and various biochemical inflammatory mediators are released, especially histamine. Histamine is produced by histidine under the action of decarboxylase. Many tissues, especially mast cells in the skin, lungs and intestinal mucosa, contain a large amount of histamine. Histamine is released when tissues are damaged or inflammation and allergic reactions occur. Histamine has a strong vasodilatory effect and can increase the permeability of the walls of capillaries and venules, causing plasma to leak into tissues, leading to local tissue redness and swelling.

The present invention mainly evaluates its after-sun repair effect by testing the mass concentration of histidine (HIS). The specific data are as follows: 240 healthy rats, half of which are male and half are female, were randomly divided into a blank group, a model group, an experimental group (Examples 1-6), and a control group (Comparative Examples 1-6), with 60 rats in each group. 24h before the experiment, the rats were depilated on the back, and the depilated area was about 3.0cm×3.0cm. Except for the blank group, the other groups were modeled on the back skin of the rats with 2,4-dinitrochlorobenzene (DNCB) (inducing dermatitis-like skin lesions) and irradiated with ultraviolet light for 12h. At 0 and 8h after the modeling was successful (the skin showed symptoms such as redness, dryness, desquamation, and spots), the experimental group took 1g of the sample to be tested prepared according to Example 1-6, and the control group took 1g of the sample to be tested prepared according to Comparative Example 1-6, and smeared the depilated area on the back of the rats, with an smearing area of about 2.5cm×2.5cm. The blank group and the model group were smeared with deionized water. The drug was administered once a day for 14 consecutive days, and observed on the 15th day. The skin condition was scored according to Table 1, and the mass concentration of histidine (HIS) in the serum of rats in each group was detected.

Table 1 Skin condition scoring table

Table 2 Repair effect after sun exposure

Note: Compared with the model group: **P＜0.01, *P＜0.05.

As can be seen from Table 2, applying the samples prepared in Examples 1-6 to the damaged skin 0h after successful modeling can significantly reduce the HIS mass concentration, reduce the inflammatory response, and improve the symptoms of redness, swelling, dryness, desquamation, and spots on the damaged skin; the samples prepared in Comparative Examples 1-6 have significantly lower improvement effects on inflammation and skin conditions than the samples prepared in Examples 1-6. Applying the samples prepared in Examples 1-6 to the damaged skin 8h after successful modeling can still significantly reduce the HIS mass concentration, reduce the inflammatory response, and improve the symptoms of redness, swelling, dryness, desquamation, and spots on the damaged skin; the samples prepared in Comparative Examples 1-6 have an improvement effect on inflammation and skin conditions, but the improvement effect is not as good as the samples prepared in Examples 1-6.

The longan shell lignin composite sunscreen particles in Examples 1-6 contain natural plant essential oils with sunscreen and repair effects, and each example contains natural plant extracts with repair effects, and these active ingredients play a great role in the repair of skin after sun exposure. Among them, Example 1 contains 5 parts of longan shell lignin composite sunscreen particles + 4 parts of plant extracts; Example 2 contains 10 parts of longan shell lignin composite sunscreen particles + 2 parts of plant extracts; Example 3 contains 5 parts of longan shell lignin composite sunscreen particles + 5 parts of plant extracts; Example 4 contains 7 parts of longan shell lignin composite sunscreen particles + 4 parts of plant extracts; Example 5 contains 6 parts of longan shell lignin composite sunscreen particles + 5 parts of plant extracts; Example 6 contains 9 parts of longan shell lignin composite sunscreen particles + 3 parts of plant extracts. As can be seen from Table 2, there are significant differences between the experimental group and the model group, but both can alleviate related symptoms and have significant after-sun repair effects. As the total content of longan shell lignin composite sunscreen particles and plant extracts decreases, its repair effect is also significantly reduced.

Comparative Examples 1-6 are the control groups of Examples 1-6, except that the longan shell lignin composite sunscreen particles are not added, and the other ingredients are the same, and the proportion of the longan shell lignin composite sunscreen particles is supplemented by a physical sunscreen or a chemical sunscreen, wherein the physical sunscreen is any one of titanium dioxide and zinc oxide or a mixture thereof; the chemical sunscreen is any one of octocrylene, homosalate, ethylhexyl methoxycinnamate, and butyl methoxydibenzoylmethane or a mixture thereof. Comparative Examples 1-6 all contain natural plant extracts with repairing effects. Among them, comparative example 1 contains 2 parts of titanium dioxide + 3 parts of octocrylene + 4 parts of plant extracts; comparative example 2 contains 4 parts of zinc oxide + 3 parts of ethylhexyl methoxycinnamate + 3 parts of butyl methoxydibenzoylmethane + 2 parts of plant extracts; comparative example 3 contains 3 parts of titanium dioxide + 2 parts of homosalate + 5 parts of plant extracts; comparative example 4 contains 3 parts of zinc oxide + 4 parts of ethylhexyl methoxycinnamate + 4 parts of plant extracts; comparative example 5 contains 3 parts of zinc oxide + 3 parts of octocrylene + 5 parts of plant extracts; comparative example 6 contains 2 parts of titanium dioxide + 2 parts of zinc oxide + 5 parts of homosalate + 3 parts of plant extracts. As can be seen from Table 2, the comparative group also has a certain after-sun repair effect, and as the content of the plant extract decreases, its repair effect also decreases to a certain extent.

The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims (9)

1. A sunscreen skin care product, characterized in that it comprises the following ingredients: longan shell lignin composite sunscreen particles, a thickener, a neutralizer, a natural moisturizer, a natural plant extract, a natural preservative, and deionized water. 2. The sunscreen skin care product according to claim 1 is characterized by: 5%-10% longan shell lignin composite sunscreen particles, 0.5%-1% thickener, 1%-2% neutralizer, 2.6%-7% natural moisturizer, 2%-5% natural plant extract, 1%-2% natural preservative, and the balance is deionized water. 3. A method for preparing a sunscreen skin care product, characterized in that it comprises the following steps: Weigh choline chloride and lactic acid in a molar mass ratio of choline chloride:lactic acid = 1:5-1:10, put them into a beaker, place them in an oil bath and heat them at 80-100° C., stir and react for 2-6 hours, and after sufficient reaction to form a transparent uniform liquid, a choline chloride/lactic acid low eutectic solvent is obtained, take it out, cool it, seal it and store it for later use; The longan shells were washed and dried at 80-90℃ for 12-24h, crushed with a pulverizer and passed through a 100-mesh sieve, and the obtained longan shell powder was put into a sealed bag and placed in a dryer for standby use; the longan shell powder was weighed, and fully mixed with DES according to the solid-liquid ratio of longan shell powder: DES = 1:10-1:30, and then placed in an oil bath pot and heated at 90-150℃, stirred for reaction for 6-12h, and centrifuged after cooling; the supernatant was poured into a beaker, and the residue was poured into a Buchner funnel and precipitated with anhydrous ethanol The mixture was washed by suction for 3-5 times, and the filtrates obtained by filtration were combined and ethanol was evaporated by rotary evaporator to obtain a concentrated solution. The supernatant and the concentrated solution were combined and slowly added into 4-6L deionized water and stirred for 15-25min, and allowed to stand for 12h. The mixture was then centrifuged at 9000-11000r/min for 20-30min to separate the solid precipitate. The solid precipitate was dried in an oven at 80-90°C for 24 hours, and the obtained black solid was longan shell lignin. Weighing longan shell lignin and dispersing it in deionized water, slowly dropping a NaOH solution with a concentration of 10%-20% while stirring, adjusting the pH value of the solution system to 9.2-9.4, and then continuing to stir for 10-15 minutes to uniformly disperse the longan shell lignin in the deionized water to prepare a longan shell lignin solution; weighing sodium alginate and dispersing it in deionized water, slowly dropping a NaOH solution with a concentration of 10%-20% while stirring, adjusting the pH value of the solution system to 8.2-8.5, and then continuing to stir for 10-15 minutes to uniformly disperse the sodium alginate in the deionized water to prepare a sodium alginate solution; The prepared longan shell lignin solution, sodium alginate solution, and natural plant essential oil with sunscreen and repair effects are measured and added into a beaker in a volume ratio of longan shell lignin solution: sodium alginate solution: natural plant essential oil = 5:5:1-10:10:1, dispersed with an ultrasonic crusher for 5-10 minutes, the upper white emulsion is washed with deionized water and centrifuged three times to remove alkalinity, the centrifugation parameters are 9000-11000r/min, 20-30min, and then vacuum freeze-dried for 48-72h to obtain longan shell lignin composite sunscreen particles; Weigh the thickener and add it to deionized water, heat and stir at 80-90°C until fully dissolved to obtain a thickener solution; Weigh allantoin and add it to deionized water, heat and stir at 80-90°C until fully dissolved to obtain an allantoin solution; Weigh sodium hyaluronate and add it into deionized water, stirring until fully dissolved to obtain a sodium hyaluronate solution; The thickener solution is cooled to about 40-50° C., a neutralizer, longan shell lignin composite sunscreen particles, a natural moisturizer, a natural plant extract, a natural preservative, and the remainder of water are added, and the solution is stirred evenly with a magnetic stirrer. The solution is sterilized at a high static pressure of 400-600 MPa for 5-10 minutes and bottled to obtain a sunscreen skin care product with excellent sunscreen and repair functions. 4. The method for preparing a sunscreen skin care product according to claim 3, wherein the natural plant essential oil is a mixture of any one or more of Niaouli essential oil, eucalyptus essential oil, rhododendron essential oil, geranium essential oil, frankincense essential oil, and sandalwood essential oil. 5. The method for preparing a sunscreen skin care product according to claim 3, wherein the thickener is carbomer. 6. The method for preparing a sunscreen skin care product according to claim 3, wherein the neutralizing agent is triethanolamine. 7. The method for preparing a sunscreen skin care product according to claim 1, wherein the natural moisturizing agent is a mixture of any one or more of glycine, serine, sodium hyaluronate, and allantoin. 8. The method for preparing a sunscreen skin care product according to claim 3, characterized in that the natural plant extract is a mixture of any one or more of turmeric extract, cucumber extract, saffron extract, and marigold extract. 9. The method for preparing a sunscreen skin care product according to claim 3, wherein the natural preservative is a mixture of any one or more of thyme essential oil, oregano essential oil, cinnamon essential oil, and clove essential oil.