KR20240046944A - Eco-friendly aplle vegan leather using apple residues and manufacturing method thereof - Google Patents

Abstract

A method for manufacturing apple leather for solving the object according to the present invention comprises the steps of: preparing a nonwoven fabric; immersing the nonwoven fabric in a liquid composition containing a water-dispersible polyurethane resin, apple powder, and essential oil to manufacture a nonwoven fabric impregnated with the liquid composition; immersing the nonwoven fabric, impregnated with the liquid composition, in an alkaline aqueous solution to manufacture an ultrafine fiber-converted nonwoven fabric; polishing the surface of the ultrafine fiber-converted nonwoven fabric to nap the surface of the nonwoven fabric; and dyeing the napped nonwoven fabric to form apple leather.

Description

Eco-friendly apple leather using apple by-products and manufacturing method thereof {ECO-FRIENDLY APLLE VEGAN LEATHER USING APPLE RESIDUES AND MANUFACTURING METHOD THEREOF}

The present invention relates to eco-friendly apple leather using apple by-products and a method for manufacturing the same. More specifically, it is environmentally friendly and harmless to the human body as it does not use volatile organic solvents, and has a gloss and texture comparable to natural leather. It relates to eco-friendly apple leather, which exhibits high mechanical properties, and a method of manufacturing the eco-friendly apple leather.

Recently, as the population increases and natural environmental problems emerge, it has become increasingly difficult to obtain large quantities of natural leather from animals.

Accordingly, artificial leather, which can obtain a texture similar to natural leather, was developed using synthetic resin as a fabric. The developed artificial leather is inexpensive and easy to process, so it is used for clothing, shoes, interior and exterior materials for furniture, interior materials for vehicle interiors, etc. It is used in many industrial fields, including interior and exterior materials for electronic products.

In general, such artificial leather is composed of a surface layer made of synthetic resin foam and a fiber layer made of fabric material, and has an appearance and function similar to natural leather, so natural leather is gradually being replaced by artificial leather as a material for bags, belts, etc. .

In general, such artificial leather is coated to a certain thickness by impregnating the fabric with a resin composition prepared by mixing polyurethane resin and a highly volatile organic solvent such as dimethylformamide, methyl ethyl ketone, toluene, acetone, and isopropyl alcohol. It is manufactured by processing, and as a result, it can have a mass similar to natural leather, a soft surface feeling, and improved flexibility.

In the case of artificial leather, which is manufactured for various purposes as described above and comes into direct contact with human skin, no harmful substances should remain, and it is essential for the current well-being culture to add eco-friendly elements from the manufacturing process. It is a requirement.

However, the organic solvents used to manufacture the artificial leather have excellent solvent properties for polyurethane, but as organic chemicals, a lot of pollution is generated during the manufacturing process, causing environmental pollution. In particular, because dimethylformamide coagulates when in contact with water, workers must individually wipe and remove used machinery, waste products tanks, and supply tanks after work. It easily penetrates into the human body through the human respiratory tract or skin, causing liver diseases, etc. A recovery device must be installed to prevent environmentally hazardous substances that cause kidney cancer, skin diseases, etc. from being released into the atmosphere. In addition, the exterior of a product coated with dimethylformamide has a color similar to that of white powder, so a process of coloring the surface using a pigment is necessary, and the pigment also contains dimethylformamide, making it inconvenient. It has the problem of being expensive and expensive to process.

Accordingly, in order to solve the above problems, a water-based polyurethane resin dispersed in water has been developed and used instead of an organic solvent. However, the polyurethane resin is unstable in water distribution, molecular size, dispersion conditions, etc., and is subject to mechanical friction, etc. There are problems such as the polyurethane resin being coated hardening due to the heat generated.

The present invention is intended to solve the above problems, and seeks to provide a method for manufacturing apple leather that has flexibility, gloss, and feel comparable to natural leather, has excellent mechanical properties, is environmentally friendly, and is harmless to the human body.

A method of producing apple leather for solving the object of the present invention includes preparing a non-woven fabric, immersing the non-woven fabric in a liquid composition containing a water-dispersed polyurethane resin, apple powder, and essential oil, and impregnating the non-woven fabric with the liquid composition. Preparing a non-woven fabric, preparing a non-woven fabric made of ultrafine fibers by immersing the non-woven fabric impregnated with the liquid composition in an aqueous alkaline solution, polishing the surface of the non-woven fabric made into ultra-fine fibers to form a brush on the surface of the non-woven fabric. It includes the step of dyeing the brushed non-woven fabric to obtain apple leather.

In one embodiment of the present invention, the water-dispersible polyurethane resin is a polyether type PTMG with a molecular weight of 1,000 to 2,000, a diol of 1,4-butanediol and 1,6 hexanediol, and methylenediphenyl diisocyanate as an isocyanate. and 4,4'-diphenylmethane diisocyanate.

In one embodiment of the present invention, the polyurethane resin is prepared by adding polyol and isocyanate at an equivalent ratio of 1.5:1, adding 0.003 wt of catalyst to the total weight, and reacting at 80 degrees for about 5-8 hours to prepare a prepolymer. , it can be manufactured by completing the polyurethane reaction by adding a solvent for viscosity control, 0.5 equivalent of diol, and a certain amount of apple powder.

In one embodiment of the present invention, in the step of manufacturing the non-woven fabric, 30 g or more and 50 g or less of apple powder may be added to 100 g of a 10% water-dispersed polyurethane resin concentration solution.

In one embodiment of the present invention, in the step of manufacturing the non-woven fabric, 30 g of apple powder may be added to 100 g of a 10% water-dispersed polyurethane resin solution.

In one embodiment of the present invention, the non-woven fabric may be an island-type composite fiber containing polyethylene terephthalate and alkali-soluble copolyester.

In one embodiment of the present invention, the essential oil may include one or more selected from the group consisting of citrus oil, cinnamon oil, eucalyptus oil, lavender oil, pine oil, lemon oil, and combinations thereof. You can.

In one embodiment of the present invention, the step of manufacturing the non-woven fabric includes immersing the non-woven fabric impregnated with the liquid composition in an aqueous alkaline solution so that the alkali-soluble copolyester contained in the non-woven fabric is eluted by the aqueous alkaline solution. It can become ultrafine fiber.

In one embodiment of the present invention, the immersion may be performed for 1 second to 120 seconds at a temperature range of 15°C to 37°C.

In one embodiment of the present invention, the nonwoven fabric may be sea-island-type microfiber.

According to the present invention, it is possible to manufacture apple leather that is harmless to the human body, eco-friendly, has flexibility, gloss, mechanical properties, and tactile feel comparable to natural leather, and is capable of being low-density and lightweight. In addition, the apple leather manufactured according to the present invention does not contain volatile organic solvents such as benzene and toluene, and thus can meet eco-friendly certification standards.

According to the present invention, apples that can be discarded can be recycled, contributing to local development and thus helping to create high added value.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

Figure 1 is a flow chart showing a method for manufacturing apple leather according to an embodiment of the present invention.
Figure 2 is a particle diagram of apple powder according to an embodiment of the present invention.
Figure 3 is a diagram for explaining apple leather according to an embodiment of the present invention by comparing it with a comparative example.
Figure 4 is a diagram for explaining the mechanical properties of apple leather according to an embodiment of the present invention of Figure 3 and a comparative example.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted. Additionally, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

The identification code for each step is used for convenience of explanation. The identification code does not explain the order of each step, and each step may be performed differently from the specified order unless a specific order is clearly stated in the context. there is. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

Hereinafter, the present invention will be described in detail with reference to the attached drawings.

One aspect of the present application includes preparing a non-woven fabric; Preparing a non-woven fabric impregnated with the liquid composition by immersing the non-woven fabric in a liquid composition containing water-dispersible polyurethane resin, apple powder, and essential oil; Preparing a non-woven fabric made of ultrafine fibers by immersing the non-woven fabric impregnated with the liquid composition in an aqueous alkaline solution; Grinding the surface of the ultrafine fiberized non-woven fabric to form a brush on the surface of the non-woven fabric; and dyeing the brushed non-woven fabric to obtain apple leather.

According to the apple leather manufacturing method according to the present invention, artificial leather with flexibility, gloss, mechanical properties, and texture comparable to natural leather can be manufactured without using volatile organic solvents, and apples that can be discarded can be recycled. It is environmentally friendly and can help local economic development.

Hereinafter, the method for manufacturing apple leather according to the present invention will be described in detail with reference to FIG. 1.

For the production of artificial leather using apple by-products, wet polyurethane resins include polyether type PTMG (molecular weight 1,000-2,000), diols (1,4-butandiol, 1,6 hexandiol, etc.), and isocyanates such as MDI (Methylene diphenyl diisocyanate, Based on 4,4'-diphenylmethane diisocyanate), the solvent produced using DMF ([dimethylformamide) is used.

Nonwoven fabric for manufacturing apple leather can be sea-island type microfiber or general type nonwoven fabric. For example, the non-woven fabric may be manufactured using island-in-the-sea composite fibers containing polyethylene terephthalate and alkali-soluble copolyester, and when the non-woven fabric made of the island-in-the-sea composite fibers is later immersed in an aqueous alkaline solution, The alkali-soluble copolyester may be dissolved and create multiple holes in the cross section of the thin thread, forming ultrafine fibers. Specifically, the non-woven fabric may be manufactured using a sea-island filament manufactured by composite spinning using polyethylene terephthalate and alkali-soluble copolyester as raw materials.

Typically, wet polyurethane resin is used at a concentration of 5 to 15% and is adjusted using DMF solvent. Artificial leather can be manufactured by impregnation by adding 1 to 50% of wet resin concentration based on 100% solution.

Add 10g of apple powder to 100g of wet polyurethane resin and mix well with a mixer to prepare a mixture. After impregnating the nonwoven fabric, add it to the coagulation tank. The coagulation bath uses water and may also add some DMF. If necessary, in the range of approximately 1 to 5%. The temperature can be adjusted from 25 to 40 if necessary. Put it in the coagulation tank and leave it there while the wet polyurethane resin solidifies, then wash it in the washing tank (100% water, temperature can be adjusted from 25 to 60 degrees Celsius). At this time, squeeze it out of the mangle, put it back into the washing tank and wash it several times, more than 5 times. Next, it is dried at about 50 to 80 degrees to produce artificial leather (suede type) containing apple powder.

To produce wet-dry type artificial leather, in order to attach a dry type polyurethane film to the suede-type artificial leather containing apple powder manufactured earlier (R/P transfer method), dry type polyurethane resin is applied to the R/P to a certain thickness. After coating with , it is dried, and adhesive is applied and adhered to the previously prepared wet-type artificial leather to produce the final wet-dry type artificial leather. Dry type polyurethane resin can be made from polyester, polyether, polycarbonate type polyol and various diols. As the isocyanate, non-yellowing type IPDI and H12MDI can be used, and other aliphatic isocyanates can be used. As an adhesive, a solvent-based polyurethane adhesive for textiles or shoes and a hardener are usually used.

Polyol and isocyanate are added at an equivalent ratio of 1.5:1, and catalyst is added at 0.003 wt to the total weight, reacted at 80 degrees for about 5-8 hours to prepare a prepolymer, and a solvent for viscosity control, 0.5 equivalent of diol, and a certain amount of apple powder are added. By completing the polyurethane reaction, a final polyurethane resin in which the apple powder is evenly dispersed is prepared. Polyurethane resin can be manufactured in both wet and dry forms using the above method.

In one embodiment, the nonwoven fabric may be manufactured using island-type composite fibers containing 70% by weight of polyethylene terephthalate and 30% by weight of alkali-soluble copolyester. If the components of the island-in-sea composite fiber exceed the above-mentioned weight percentage, the sea components may not be sufficiently dissolved when immersed in an aqueous alkaline solution later, and the fiber may not be formed into ultrafine fibers.

Next, the non-woven fabric is immersed in a liquid composition containing water-dispersible polyurethane resin, apple powder, and essential oil to prepare a non-woven fabric impregnated with the liquid composition.

In one embodiment, the liquid composition includes about 10 to about 50% by weight of water-dispersible polyurethane resin, about 0.01 to about 3% by weight of apple powder, about 0.1 to about 5% by weight of essential oil, and the remaining amount of purified water. It may be.

In the liquid composition, water-dispersible polyurethane resin is the main ingredient that is impregnated into the non-woven fabric to form artificial leather. Conventionally, artificial leather was formed by dissolving polyurethane resin in a polar organic solvent and coating or impregnating the fabric. However, due to the risk of odor, pollution, and fire caused by the polar organic solvent, the water dispersion that can be dissolved in water is used. Polyurethane resin was used. Accordingly, apple leather, which is artificial leather manufactured by the method according to the present invention, exhibits environmental friendliness and has the effect of protecting worker safety by preventing odor and fire risk during the manufacturing process.

In one embodiment, the water-dispersible polyurethane resin may be included in an amount of about 10 to about 50% by weight based on the total weight of the liquid composition. If the water-dispersed polyurethane resin is added in an amount of less than about 10% by weight, the mechanical strength of the apple leather produced may decrease, and if it exceeds about 50% by weight, the viscosity of the liquid composition increases too much, making workability difficult. This may fall.

In one embodiment, apple powder, as a component of the liquid composition, improves the viscosity of the liquid composition, increases adhesion between the non-woven fabric and the water-dispersed polyurethane resin, and contains an abundance of carotenoid pigments to provide a bright color later. It may be included to reduce the amount of dye used when dyeing apple leather.

Figure 2 is a particle diagram of apple powder according to an embodiment of the present invention.

Referring to Figure 2, apple powder has particles having a size above a certain level.

The apple powder may refer to apple powder obtained from apples. Specifically, the apple powder includes the steps of preparing and washing apples; Separating the apple pulp and apples from the apples and collecting only the apples; Hot air drying the apples; and grinding the hot-air dried apples to obtain apple powder. In addition, apple powder prepared from apples exhibits high antioxidant and antibacterial activity, so it can be added when manufacturing apple leather to prevent mold from occurring when the apple leather is stored for a long period of time.

In one embodiment, the apple powder may be included in about 0.01 to about 3% by weight in the liquid composition. If the apple powder is included in less than about 0.01% by weight, the effect of including the apple powder may be minimal, and if it exceeds about 3% by weight, the viscosity of the liquid composition may become too high and workability may decrease.

In one embodiment, the apples may be hot air dried at a temperature ranging from about 60°C to about 90°C for about 1 hour to about 12 hours. If dried for less than about 1 hour at a temperature below 60℃, the apples may not be dried sufficiently and rotting may occur, and if dried for more than 12 hours at a temperature exceeding 90℃, they may easily burn and cause unpleasant damage. Fragrance may occur.

In one embodiment, the essential oil as a component of the liquid composition is a natural ingredient that imparts a refreshing scent, thereby stabilizing the mind and body and relieving stress when not only workers in the process but also consumers of apple leather breathe in the scent. You can. In addition, the viscosity of the liquid composition can be adjusted to help the liquid composition quickly coat and impregnate the surface and interior of the non-woven fabric when immersing the non-woven fabric.

In one embodiment, the essential oil may be added to complement the stiff feel of artificial leather using conventional water-dispersed polyurethane resin. For example, by being included in the liquid composition, the essential oil can complement the stiff feel of the apple leather produced and provide a soft touch and gloss, thereby realizing a gloss and touch comparable to natural leather.

In one embodiment, the essential oil includes one or more selected from the group consisting of citrus oil, cinnamon oil, eucalyptus oil, lavender oil, pine oil, lemon oil, fragrance oil, and combinations thereof. It may, and specifically may include citrus oil.

In one embodiment, the essential oil may be included in an amount of about 0.1 to about 5% by weight based on the total weight of the liquid composition. If the essential oil is included in less than about 0.1% by weight, the flexibility, touch, gloss, and fragrance that appear due to the inclusion of the essential oil may not be fully demonstrated. If it exceeds about 5% by weight, the essential oil may not be sufficiently used with other ingredients. Mixability may be impaired.

In one embodiment, the liquid composition may further include pine needle extract. The pine needles refer to the leaf parts of pine trees, which are coniferous evergreen trees distributed in Korea, Japan, China, etc. The pine needles have a refreshing scent, and by containing terpenes and tannins as pharmacological ingredients, they can inhibit the growth of microorganisms and exhibit antibacterial and preservative effects. Accordingly, the apple leather manufactured by the method according to the present invention blocks the propagation of microorganisms, prevents the development of mold, and thus improves the storage properties of the apple leather.

In one embodiment, the pine needle extract includes collecting pine needles from pine trees, washing and drying them; Preparing pine needle powder by grinding the washed and dried pine needles; Extracting hot water by adding about 10 to about 500 times the weight of the pine needle powder as a solvent and heating it at a temperature range of about 100°C to about 180°C; It may be obtained by filtering the extract using a filter to obtain a pine needle extract. As the pine needle extract is obtained by the method described above, the pharmacological ingredients contained in the pine needles are sufficiently dissolved to achieve antibacterial, odor, and preservative effects.

In one embodiment, the pine needle extract may be included in an amount of about 0.1 to about 5% by weight based on the total weight of the liquid composition. If the pine needle extract is included in less than about 0.1% by weight, the antibacterial, odor and preservative effects resulting from the inclusion of the pine needle extract may not be sufficiently exerted, and if it exceeds about 5% by weight, it may be miscible with other ingredients. This may be hindered.

In one embodiment, the liquid composition may further include a naturally derived water repellent. Artificial leather manufactured using conventional water-dispersed polyurethane resin has weak physical properties, so fluff easily occurs and appearance defects such as deformation may occur. In particular, when used in a humid environment, such appearance defects may occur frequently, and problems with mold growth may also occur. Accordingly, the liquid composition additionally contains a naturally derived water repellent, which is a substance with water repellent and waterproof properties that can be easily obtained from nature, thereby imparting water repellent performance to the manufactured apple leather, thereby improving the storage and usability of the apple leather. I can do it

In one embodiment, the naturally derived water repellent agent may include one selected from the group consisting of palm oil extracted from the endosperm of coco palm fruit, olive oil, pizza horse oil, peanut oil, pork fat, lamb fat, beef tallow, and combinations thereof. and, specifically, may include palm oil.

In one embodiment, the naturally derived water repellent may be included in an amount of about 0.01 to about 3% by weight based on the total weight of the liquid composition. If the naturally derived water repellent is included in less than about 0.01% by weight, the water repellent effect resulting from the inclusion of the naturally derived water repellent may not be sufficiently exerted, and if it exceeds about 3% by weight, miscibility with other ingredients is impaired. It can be.

In one embodiment, the liquid composition may further include lotus root extract to improve adhesion between the liquid composition and the non-woven fabric. The lotus root extract is a natural adhesive ingredient and functions as a binder that improves the miscibility between the water-dispersible polyurethane resin and other components included in the liquid composition, and the water-dispersible polyurethane resin and non-woven fabric.

In one embodiment, the lotus root extract is prepared by peeling and pulverizing the lotus root, adding water 5 times the weight of the lotus root, heating at about 80°C to about 100°C for more than 6 hours, and extracting the liquid component. It may be prepared by filtering and then concentrating the filtered liquid component at about 55°C to about 60°C.

In one embodiment, the lotus root extract may be included in an amount of about 0.1 to about 5% by weight based on the total weight of the liquid composition. If the lotus root extract is included in an amount of less than about 0.1% by weight, the effect of improving adhesion may not be sufficiently exerted, and if it exceeds about 5% by weight, dispersibility and mixing properties may be impaired.

In one embodiment, the liquid composition may improve mechanical strength by additionally including water-soluble natural polymers.

In one embodiment, the water-soluble natural polymer is chitosan, chitosan salt, chitosan derivative; dextran, dextran derivative; Hyaluronic acid, hyaluronic acid salts, hyaluronic acid derivatives; Pectin, pectin salts, pectin derivatives; alginic acid, alginate, alginate derivatives; Agar, galactomannans, galactomannan salts, galactomannan derivatives; xanthan, xanthan salt, xanthan derivative; Beta-cyclodextrin, beta-cyclodextrin salt, beta-cyclodextrin derivative; and amylose (water-soluble starch), and may specifically include a dextran derivative. Dextran is a type of bacterial polysaccharide in which sugarcane is decomposed by bacteria and polymerized into D-glucose as a glucose polymer, and may consist of chains of various lengths ranging from about 3 to about 2000 kDa.

In one embodiment, the dextran derivative may include acacia gum or tragacanth, but is not limited thereto.

In one embodiment, the water-soluble natural polymer may be included in an amount of about 0.01 to about 3% by weight based on the total weight of the liquid composition. If the water-soluble natural polymer is contained in an amount of less than about 0.01% by weight, the effect of improving mechanical strength may not be sufficiently exerted, and if it exceeds about 3% by weight, miscibility with other components may be impaired.

In one embodiment, the immersion may be performed for about 1 second to about 120 seconds at a temperature ranging from about 15°C to about 37°C. If the immersion is performed for less than about 1 second at a temperature of less than about 15°C, the liquid composition may not be sufficiently impregnated, and if the immersion is performed at a temperature exceeding about 37°C, the fabric may be damaged. , if it exceeds about 120 seconds, the process may take too long and work efficiency may decrease.

Next, the non-woven fabric impregnated with the liquid composition is immersed in an aqueous alkaline solution to produce a non-woven fabric made of ultrafine fibers. For example, by immersing the non-woven fabric impregnated with the liquid composition in an aqueous alkaline solution, the aqueous alkaline solution makes alkali soluble, which is a sea component of the sea-island composite fiber containing polyethylene terephthalate and alkali-soluble copolyester of the non-woven fabric. The copolyester may be eluted and converted into ultrafine fibers.

In one embodiment, the aqueous alkaline solution can be used without limitation as long as it is an aqueous solution in which an alkaline substance is dissolved in water, for example, aqueous sodium hydroxide solution, aqueous potassium hydroxide solution, aqueous sodium carbonate solution, aqueous potassium carbonate solution, aqueous potassium hydrogen carbonate solution. , and combinations thereof. Preferably, the alkaline aqueous solution may be an aqueous sodium hydroxide solution.

In one embodiment, the step of sonicating the ultrafine fiberized non-woven fabric may be further included. For example, by sonicating the nonwoven fabric converted into ultrafine fibers, the alkali-soluble copolyester polyester, which is an undissolved sea component when immersed in the aqueous alkali solution, is completely dissolved and removed, thereby converting the nonwoven fabric into ultrafine fibers. More specifically, the non-woven fabric impregnated with the liquid composition may be immersed in an aqueous alkaline solution and ultrasonicated to produce a non-woven fabric made of ultrafine fibers.

In one embodiment, the ultrasonic treatment may be performed for about 5 minutes to about 30 minutes at a temperature of about 40°C to about 65°C with a power of about 100 to about 500 W. If the ultrasonic treatment is performed at a power of less than about 100 W, a temperature of less than about 40° C., and/or for less than about 5 minutes, the effect of maximizing the dissolution of sea components may be minimal, and the ultrasonic treatment may be performed for about 500 ℃. If performed at a power exceeding W, a temperature exceeding about 65° C., and/or exceeding about 30 minutes, the mechanical strength of the non-woven fabric and the apple leather manufactured using the non-woven fabric may decrease excessively.

In one embodiment, the step of neutralizing the nonwoven fabric immersed in the alkaline aqueous solution by immersing it in an acid aqueous solution may be further included. By immersing the nonwoven fabric that has been made into ultrafine fibers by immersing in the aqueous alkaline solution and neutralizing it by immersing in the aqueous acid solution, it is possible to prevent the fabric from being damaged.

In one embodiment, the acid aqueous solution can be used without limitation as long as it is an aqueous solution in which an acidic component is dissolved in water, for example, acetic acid, butyric acid, citric acid, From the group consisting of palmitic acid, oxalic acid, tartaric acid, glycolic acid, lactic acid, maleic acid, and combinations thereof. It may include something that is selected.

Next, the surface of the ultrafine fiberized non-woven fabric is polished to form a brush on the surface of the non-woven fabric. For example, the surface of the ultrafine fiberized non-woven fabric may be polished and heat-treated to form a brush on the surface of the non-woven fabric.

In one embodiment, the polishing may be done using a conventional raising machine and/or sandpaper. For example, it may be treated with a regular raising machine about 2 to about 10 times, or using sandpaper with a mesh of about 100 to about 240.

In one embodiment, the heat treatment may be performed at a temperature ranging from about 110°C to about 160°C. If the heat treatment is performed below about 110°C, the brush may not be sufficiently formed, and if it exceeds about 160°C, the mechanical strength of the apple leather produced may be reduced due to heat damage.

Finally, the brushed non-woven fabric is dyed to obtain apple leather. The dyeing may be used without limitation as long as it can color synthetic leather or artificial leather. For example, it may be dyeing in a dyeing machine using a disperse dye.

In one embodiment, apple skin produced by the method according to the invention can be used as an outer skin. For example, the apple leather can be used as an outer skin and combined with an inner skin to make bags, wallets, interior and exterior materials for automobiles, interior and exterior materials for furniture, clothing, shoes, and interior and exterior materials for electronic products.

In one embodiment, when the apple leather is used in combination with an inner skin, the inner skin is, for example, a group consisting of polyester, recycled polyester, spandex, Gore-Tex, polyester-nylon, and combinations thereof. It may include one or more selected from.

In one embodiment, the apple leather may meet eco-friendly certification standards. For example, the apple vegan leather may be characterized as being an eco-friendly artificial leather that has passed eco-friendly certification standards as it contains a very low amount of volatile organic compounds. Specifically, the volatile organic solvent is selected from the group consisting of dimethylformamide (DMF), methyl ethyl ketone (MEK), toluene, benzene, ethylbenzene, xylene, styrene, formaldehyde, arctolein, and combinations thereof. It may contain one or more of your choice.

Hereinafter, with reference to FIGS. 3 and 4, the configuration of the present invention and its effects will be described in more detail through specific examples and comparative examples. However, these examples are for illustrating the present invention in more detail, and the scope of the present invention is not limited to these examples.

Figure 3 is a diagram for explaining apple leather according to an embodiment of the present invention by comparing it with a comparative example. Figure 4 is a diagram for explaining the mechanical properties of apple leather according to an embodiment of the present invention of Figure 3 and a comparative example.

Referring to Figures 3 and 4, the leather gloss and mechanical properties of apple leather according to an embodiment of the present invention compared to comparative examples are shown.

[Leather gloss of Comparative Examples 1 and 2 and Examples 1 to 3]

1 (Comparative Example 1) 2 (Comparative Example 2) 3 (Example 1) 4 (Example 2) 5 (Example 3) profit
(Solids 15%) 100 100 100 100 100 apple powder
(phr) 10 20 30 40 50

As shown in the table above, in the case of apple leather manufactured by the method according to the present invention, mechanical strength and leather gloss were tested by adjusting the ratio of apple powder.

Referring to Figure 3, it was confirmed that the leather gloss appeared brown when apple powder was added to 100 resin with a solid content of 15% and more than 30 phr.

[Measurement of mechanical properties]

Tensile load L/W, breaking elongation L/W, tear load L/W, and peeling load for the apple leathers manufactured in Examples 1 to 3 and Comparative Examples (Peel load) and abrasion resistance were measured respectively.

First, tensile load, elongation at break, and tear load were measured according to ISO 13934-1, peeling load was measured according to ISO 11644, and abrasion strength was measured according to ATSM_04966. Each measurement result is shown in Figure 4 below.

As shown in Figure 4, the apple leather manufactured by the method according to the present invention shows very high mechanical strength in all tensile load, elongation at break, tear load, peeling load, and abrasion strength compared to the comparative example. It was confirmed that it met the certification standards.

[Durability Measurement]

Yellowing resistance, torsion resistance, and color fastness (dry/wet) of the apple leathers prepared in Examples 1 to 3 and Comparative Examples were measured according to ASTM_D4157 and ISO, respectively. 5402 and AATCC-8, respectively. In the case of apple leather manufactured by the method according to the present invention, durability measurement results including yellowing resistance, warping resistance, and dye fastness showed improved results compared to the comparative example. It was confirmed that it met the certification standards.

In this specification, only a few examples of various embodiments performed by the present inventors are described, but the technical idea of the present invention is not limited or limited thereto, and of course, it can be modified and implemented in various ways by those skilled in the art.

Claims (10)

Preparing non-woven fabric;
Preparing a non-woven fabric impregnated with the liquid composition by immersing the non-woven fabric in a liquid composition containing water-dispersible polyurethane resin, apple powder, and essential oil;
Preparing a non-woven fabric made of ultrafine fibers by immersing the non-woven fabric impregnated with the liquid composition in an aqueous alkaline solution;
Grinding the surface of the ultrafine fiberized non-woven fabric to form a brush on the surface of the non-woven fabric; and
A method of producing apple leather, comprising the step of dyeing the non-woven fabric on which the brushing is formed to obtain apple leather. According to paragraph 1,
The water-dispersed polyurethane resin includes polyether-type PTMG with a molecular weight of 1,000 to 2,000, a diol of 1,4-butanediol and 1,6 hexanediol, and methylenediphenyl diisocyanate and 4,4'-diphenylmethane as isocyanates. A method for producing apple leather, characterized in that it is based on MDI of one of the diisocyanates. According to paragraph 1,
The polyurethane resin is prepared by adding polyol and isocyanate at an equivalent ratio of 1.5:1, adding 0.003 wt of catalyst to the total weight, reacting at 80 degrees for about 5-8 hours to prepare a prepolymer, and adding a solvent for viscosity control and 0.5 equivalent of diol. A method of manufacturing apple leather, characterized in that it is manufactured by completing the polyurethane reaction by adding a certain amount of apple powder. According to paragraph 1,
In the step of manufacturing the non-woven fabric, an apple leather manufacturing method characterized in that 30 g or more and 50 g or less of apple powder is added to 100 g of a 10% water-dispersed polyurethane resin concentration solution. According to paragraph 4,
A method of producing apple leather, characterized in that, in the step of manufacturing the non-woven fabric, 30 g of apple powder is added to 100 g of a solution of 10% water-dispersed polyurethane resin concentration. According to paragraph 1,
A method of producing apple leather, characterized in that the non-woven fabric is a sea-island composite fiber containing polyethylene terephthalate and alkali-soluble copolyester. According to paragraph 1,
The method of producing apple leather, wherein the essential oil includes one or more selected from the group consisting of citrus oil, cinnamon oil, eucalyptus oil, lavender oil, pine oil, lemon oil, and combinations thereof. According to paragraph 1,
In the step of manufacturing the non-woven fabric, the non-woven fabric impregnated with the liquid composition is immersed in an aqueous alkaline solution, and the alkali-soluble copolyester contained in the non-woven fabric is eluted by the aqueous alkaline solution and converted into ultrafine fibers. Leather manufacturing method. According to paragraph 1,
The method of producing apple leather, characterized in that the immersion is performed for 1 second to 120 seconds at a temperature range of 15°C to 37°C. According to paragraph 1,
A method of producing apple leather, characterized in that the non-woven fabric is sea-island microfiber.