CN103407205B - Konjac glucomannan fiber wet tissue and method for preparing same - Google Patents

Abstract

The invention relates to a konjac glucomannan fiber wet tissue and a preparation method thereof. A preparation method of konjac glucomannan fiber wet tissue comprises preparation of konjac glucomannan acrylate, konjac glucomannan esterification modification, preparation of konjac glucomannan silk-like slurry and konjac glucomannan Preparation of fiber wet wipes. The konjac glucomannan fiber wet tissue of the present invention is made of natural fibers such as konjac glucomannan and corn starch as main raw materials and supplemented with other plasticizers. Konjac glucomannan is a kind of natural plant polysaccharide, which has excellent water holding capacity, water absorption, antibacterial property, high tensile strength, good flexibility, high tensile strength and burst resistance; the konjac glucomannan of the present invention Compared with traditional synthetic fiber wet wipes, fiber wet wipes are made of 100% natural plant fibers. The wet wipes produced have high tensile strength, large liquid absorption, high liquid retention, delicate and soft hand feeling, and are sterile Hygienic and other characteristics, with low production cost, no environmental pollution, no harm to the human body, etc., in line with modern consumption concepts and market demand.

Description

A kind of konjac glucomannan fiber wet tissue and preparation method thereof

technical field

The invention relates to a fiber wet tissue and a preparation method thereof, in particular to a konjac glucomannan fiber wet tissue and a preparation method thereof.

Background technique

In our daily life environment, bacteria are everywhere, but due to various social activities such as work and study, hands need to be in constant contact with various foods, so we will be infected with a large number of microorganisms and pathogenic bacteria. So we must develop the habit of washing our hands frequently. However, people cannot wash their hands in time in daily life, especially when performing outdoor activities, which endangers people's health to a certain extent, so the demand for wet paper towels is increasing day by day. Especially in the past two years, the production and market of wet wipes have developed very rapidly, and their uses have become increasingly diversified, gradually becoming the new darling of the toilet paper market.

However, most of the existing disinfectant wet wipes use non-woven fabrics and paper made by traditional papermaking methods as carriers, and are soaked in common chemical disinfectants. The safety of use is doubtful, and there are environmental problems in the whole process. Therefore, with the continuous enhancement of people's awareness of environmental protection, the continuous improvement of their own safety requirements and the continuous update and improvement of products, a safe and environmentally friendly wet tissue with high water holding rate and high antibacterial property is urgently needed for our research and development.

Application No. 97117967.0 for the invention patent "Method for Manufacturing Wet Paper Towels" (application date: 1997.07.25) provides wet paper towels with improved wet strength during use. In the manufacturing process of wet tissues, wet tissues are obtained by impregnating a liquid containing polyvalent metal ions in a sheet of carboxymethylcellulose salt having relatively low water swelling property or even water insoluble. Although this invention has improved the wetness of wet paper towels, the polyvalent metal ions therein are mostly basic metal ions such as divalent iron and zinc, which are highly irritating to the skin, and long-term use is not conducive to human health. The raw materials used in the production method of the present invention include carboxymethyl cellulose or its salts, mostly synthetic fibers such as synthetic fibers, nylon, polyester, etc., which are difficult to biodegrade after use.

The invention patent of application number 200810101766.3 "A high-efficiency sterilizing wet tissue" (application date: 2008.03.12) provides a bactericidal tissue, which is made by soaking the tissue in a bactericide. The sterilizing paper towel has a good function of sterilizing and disinfecting, but the wet paper towel is prepared by soaking a bactericide on the basis of the original wet paper towel base, which does not fundamentally solve the problem of safe use of the disinfecting paper towel.

Contents of the invention

The purpose of the present invention is to provide a kind of konjac glucomannan fiber wet tissue and its preparation method. Using natural fibers such as konjac glucomannan and corn starch as the main raw materials, using konjac glucomannan's high water absorption and swelling properties, high water holding capacity, high antibacterial properties and adding (glycerin, ethanol) to improve konjac glucomannan Tensile strength, bursting strength and elongation of fiber wet tissue, adding monolauryl maleate to improve the water holding capacity of konjac glucomannan fiber wet tissue, adding chitosan and acrylic acid to esterify konjac glucomannan Modification improves the antibacterial ability of the konjac glucomannan fiber wet tissue, and provides a safe and environment-friendly wet tissue with high water holding rate and high antibacterial property and a preparation method thereof.

The preparation method of the konjac glucomannan fiber wet tissue of the present invention comprises preparation of konjac glucomannan acrylate, konjac glucomannan esterification modification, preparation of konjac glucomannan silk-like slurry, konjac glucomannan The preparation of polysaccharide fiber wet tissue is characterized in that:

(1) Preparation of konjac glucomannan acrylate: Take hot water and keep it at 45-50°C, add konjac glucomannan, acrylic acid and concentrated sulfuric acid with a volume concentration of 98% while stirring, and the reaction time is 4h-4.5h Then, rotate at a speed of 500r/min and evaporate and concentrate the reaction solution until the water content is 0.1% to 0.5%, add ethanol with a volume concentration of 60%, precipitate, and take the precipitate and wash it with ethanol with a volume concentration of 95% 2 to 3 times, filter and air-dry the precipitate at room temperature, then crush to obtain substance A, for later use; the mass ratio of the acrylic acid and konjac glucomannan to water is 1:100-200, and the acrylic acid and konjac glucomannan The mass ratio of polysaccharide is 3-3.82:1, concentrated sulfuric acid accounts for 1%-2% of the volume of acrylic acid;

(2) Esterification modification of konjac glucomannan: Dissolve monolauryl maleate in ethanol with a volume concentration of 60% at a mass volume ratio (g/mL) of 1:200-300, and use volume The concentration is 20% dilute sulfuric acid to adjust the pH value to 3-5; add konjac glucomannan according to the mass ratio of monolauryl maleate and konjac glucomannan at a ratio of 1:10-20, stir evenly, and React at a temperature of 30-50°C for 1-3 hours, then wash the precipitate with ethanol with a volume concentration of 60%, filter and dry the precipitate in vacuum at 50°C to obtain substance B, which is crushed for later use;

(3) Preparation of konjac glucomannan imitation silk slurry:

(a) Take cornstarch, add sterile water at a mass volume ratio (g/mL) of 1:100-300, swell at 65-90°C for 12-14 hours, and disperse to obtain substance C;

(b) According to the ratio of mass to volume (g/mL) of 1:100-300, take chitosan and add it to acetic acid aqueous solution with pH 3-3.5, stir and dissolve, and swell at 65-90°C for 12-14 hours, Disperse to obtain substance D;

(c) Mix the substance A prepared in step (1) with the substance B prepared in step (2) according to the mass ratio of 1:1～2 to obtain the AB mixture; mix substance C and substance D according to the volume ratio Mix at a ratio of 2 to 3:1 to obtain a CD mixture; add the AB mixture to the CD mixture, and then disperse for 15 to 20 minutes at an ultrasonic power of 100 to 180 W at 25°C to 90°C to obtain konjac glucomannan imitation silk slurry;

(4) Preparation of konjac glucomannan fiber wet wipes: the konjac glucomannan silk-like slurry in step (3) is processed through a complete set of fiber wet spinning equipment to obtain fiber wet wipes. The complete set of equipment for wet spinning of the fiber is processed

The raw materials used in the present invention are all food grade.

The present invention also protects the konjac glucomannan fiber wet tissue prepared by the above method.

The invention has the following advantages: the konjac glucomannan fiber wet tissue of the invention is made of natural fibers such as konjac glucomannan and corn starch as main raw materials and supplemented with other plasticizers. Konjac glucomannan is a kind of natural plant polysaccharide, which has excellent water holding capacity, water absorption, antibacterial property, high tensile strength, good flexibility, high tensile strength and burst resistance; the cornstarch of the present invention is rich in natural Plant fiber, strong hygroscopicity. Compared with the traditional synthetic fiber wet tissue, the konjac glucomannan fiber wet tissue of the present invention is made of 100% natural plant fiber, and the wet tissue product produced has high tensile strength, large liquid absorption capacity and high liquid retention capacity , The use of fine and soft feel, aseptic hygiene and other characteristics. The wet tissue avoids skin damage caused by repeated use of traditional wet tissue, and can be naturally degraded after use, returning to nature and protecting the environment. This product is suitable for use in entertainment and public places such as travel, family, personal, hotel, hotel, office building, hospital, airport, etc., to improve the quality of life and service level.

The safety and usability of the new konjac glucomannan fiber wet wipes of the present invention fully meet the requirements of relevant national standards. The present invention uses natural fibers such as konjac glucomannan and corn starch as main raw materials, supplemented by other plasticizers (such as chitosan), chitosan of the present invention is the second largest biological polysaccharide after cellulose in nature, and is also the only alkaline polysaccharide that exists in large quantities in nature, has good biocompatibility, biological Degradability and excellent properties such as antibacterial and antiseptic". The present invention utilizes konjac glucomannan and monolauryl maleate dry method esterification modification, the viscosity and water holding capacity of the modified product are significantly improved, and Has good biodegradability. Konjac glucomannan acrylate of the present invention has stronger antibacterial effect, has good biodegradability, is a kind of safe and environment-friendly biological material. The present invention has low production cost, no environmental pollution , no harm to the human body and other advantages, in line with modern consumption concepts and market demand.

The konjac glucomannan fiber wet tissue of the present invention and common wet tissue are tested as follows:

(1) Water retention: Take 3 pieces of the konjac glucomannan fiber wet tissue of the present invention and ordinary wet tissue respectively, and place them in the same temperature environment, that is, at a high temperature of 50°C; then take 3 pieces each, and place them in the same temperature environment. At room temperature of 15°C, calculate the average time required for each type of wet tissue to completely lose water at different temperatures.

(2) Antibacterial property: test ordinary wet wipes and konjac glucomannan fiber wet wipes to sterilize and disinfect the natural flora on the right hands of several people, wipe hands for 2 minutes, and observe the average sterilization effect respectively.

(3) Biodegradability: Bury three ordinary wet wipes and three konjac glucomannan fiber wet wipes in the same soil, and observe the degradation of the wet wipes after one month.

Table 1 shows the performance comparison results between the konjac glucomannan fiber wet tissue of the present invention and ordinary wet tissue.

Table 1 The performance comparison of wet paper towels of the present invention and ordinary wet paper towels

                                                 

Through the above comparative tests, the konjac glucomannan fiber wet tissue of the present invention has strong water retention capacity, good antibacterial property, almost complete biodegradability, and various performances are superior to ordinary wet tissue, and has excellent development prospects.

specific embodiment

Below in conjunction with embodiment the present invention is further elaborated.

Embodiment 1: A kind of preparation method of konjac glucomannan fiber wet tissue

A preparation method of konjac glucomannan fiber wet tissue, comprising the following steps:

(1) Preparation of konjac glucomannan acrylate: Take hot water and keep it at 45-50°C, add konjac glucomannan, acrylic acid and concentrated sulfuric acid with a volume concentration of 98% while stirring, and the reaction time is 4h; then, Rotate at a speed of 500r/min and evaporate and concentrate the reaction solution until the water content is 0.5%. Add ethanol with a volume concentration of 60% for precipitation. The precipitate is washed 3 times with ethanol with a volume concentration of 95%, filtered and The precipitate was air-dried at room temperature and crushed to obtain substance A, which was set aside; the mass ratio of the acrylic acid and konjac glucomannan to water was 1:150, and the mass ratio of acrylic acid to konjac glucomannan was 3.5:1. Concentrated sulfuric acid accounts for 1.5% of the volume of acrylic acid;

(2) Esterification modification of konjac glucomannan: Dissolve monolauryl maleate in ethanol with a volume concentration of 60% at a mass volume ratio (g/mL) of 1:250, and use a volume concentration of 20% dilute sulfuric acid to adjust the pH value to 4; add konjac glucomannan according to the mass ratio of monolauryl maleate and konjac glucomannan at a ratio of 1:15, stir evenly, and react at 40°C for 2 hours , and then washed the precipitate with ethanol with a volume concentration of 60%, filtered and dried the precipitate in vacuum at 50°C to obtain substance B, which was crushed for later use;

(3) Preparation of konjac glucomannan imitation silk slurry:

(a) Take cornstarch, add sterile water at a ratio of mass volume ratio (g/mL) of 1:200, swell at 80°C for 13 hours, and disperse to obtain substance C;

(b) According to the ratio of mass volume (g/mL) of 1:200, take chitosan and add it to acetic acid aqueous solution with pH 3.5, stir and dissolve, swell at 80°C for 13 hours, and disperse to obtain substance D;

(c) Mix the substance A prepared in step (1) with the substance B prepared in step (2) according to the mass ratio of 1:1 to obtain the AB mixture; mix substance C and substance D according to the volume ratio of 2: Mix at a ratio of 1 to obtain a CD mixture; add the AB mixture to the CD mixture, and then disperse for 20 minutes at an ultrasonic power of 150W and 70°C to obtain a konjac glucomannan silk-like slurry;

(4) Preparation of konjac glucomannan fiber wet wipes: process the konjac glucomannan silk-like slurry in step (3) through a complete set of fiber wet spinning equipment, that is, dissolve, filter, defoam, measure, and coagulate , Stretching, washing, shaping, winding, drying, cooking, freezing and sterilization to obtain fiber wet wipes. The full set of fiber wet spinning equipment refers to the full set of fiber wet spinning equipment with models 105, 155, and 215. The whole process of cooking, curing and freezing sterilization is completed by a complete set of fiber wet spinning equipment referring to the existing technology; the specific steps are as follows:

(a) Spinning: Filter the spinning slurry in step (3) through a 180-mesh sieve, place it under a negative pressure of 400 mm Hg for 0.8 hours, and then use a metering pump (pressure above 1 MPa, maximum flow: 1200L/H) to the spinning head (usually 3000 to tens of thousands of holes) for extrusion, the filaments enter the coagulation bath, and the coagulation bath is equipped with a pH 4.5 ethanol solution with a volume concentration of 98%, stretching while coagulating, The stretching ratio is controlled at 2.0, and finally, after being washed with 70% acidic ethanol with a volume concentration of pH4, it is wound up, dried to a moisture content of 5%, and becomes konjac glucomannan superabsorbent fiber;

(b) Cooking and maturing: put the konjac glucomannan superabsorbent fiber product in step (a) in water vapor with an absolute pressure of 0.4Mpa and a temperature of 140°C for 25 minutes; after raw silk maturation, extract sericin Sericin aqueous solution, put the sericin aqueous solution into a wet paper towel mold and let it stand for 12 hours, then cook at 150°C for 5 hours to prepare a molding blank;

(c) Freezing sterilization: After evenly inserting holes in the molded blanks prepared in step (b), freeze them at 0°C for 2 days and then thaw and dehydrate them; The semi-finished product is thawed and dehydrated, bleached, desulfurized, and sterilized to obtain a new type of konjac glucomannan fiber paper towel. Described bleaching agent is hydrogen peroxide, and described bactericide is ozone or ultraviolet ray.

(d) Humidification packaging: Finally, the konjac glucomannan fiber paper towel prepared in step (c) is reinforced and entangled under high pressure with a hydroentanglement machine, then humidified, soaked in sterilizing solution, and sealed for packaging.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (2)

1. A preparation method of konjac glucomannan fiber wet tissue, comprising preparation of konjac glucomannan acrylate, konjac glucomannan esterification modification, preparation of konjac glucomannan silk-like slurry, konjac glucomannan The preparation of mannan fiber wet tissue is characterized in that: (1) Preparation of konjac glucomannan acrylate: Take hot water and keep it at 45-50°C, add konjac glucomannan, acrylic acid and concentrated sulfuric acid with a volume concentration of 98% while stirring, and the reaction time is 4h-4.5h Then, rotate at a speed of 500r/min and evaporate and concentrate the reaction solution until the water content is 0.1% to 0.5%, add ethanol with a volume concentration of 60%, precipitate, and take the precipitate and wash it with ethanol with a volume concentration of 95% 2 to 3 times, filter and air-dry the precipitate at room temperature, then crush to obtain substance A, for later use; the mass ratio of the acrylic acid and konjac glucomannan to water is 1:100-200, and the acrylic acid and konjac glucomannan The mass ratio of polysaccharide is 3-3.82:1, concentrated sulfuric acid accounts for 1%-2% of the volume of acrylic acid; (2) Esterification modification of konjac glucomannan: Dissolve monolauryl maleate in ethanol with a volume concentration of 60% at a ratio of 1:200 to 300 by mass volume, and use 20% volume concentration of ethanol Dilute sulfuric acid to adjust the pH value to 3-5; add konjac glucomannan according to the mass ratio of monolauryl maleate and konjac glucomannan at a ratio of 1:10-20, stir evenly, React for 1 to 3 hours, then wash the precipitate with ethanol with a volume concentration of 60%, filter and dry the precipitate in vacuum at 50°C to obtain substance B, which is crushed for later use; (3) Preparation of konjac glucomannan imitation silk slurry: (a) Take cornstarch, add sterile water at a ratio of 1:100 to 300 by mass to volume, swell at 65 to 90°C for 12 to 14 hours, and disperse to obtain substance C; (b) According to the ratio of mass volume ratio of 1:100~300, take chitosan and add it into the acetic acid aqueous solution with pH 3~3.5, stir and dissolve, swell at 65~90°C for 12~14h, and disperse to obtain substance D ; (c) Mix the substance A prepared in step (1) with the substance B prepared in step (2) according to the mass ratio of 1:1～2 to obtain the AB mixture; mix substance C and substance D according to the volume ratio Mix at a ratio of 2 to 3:1 to obtain a CD mixture; add the AB mixture to the CD mixture, and then disperse for 15 to 20 minutes at an ultrasonic power of 100 to 180 W at 25°C to 90°C to obtain konjac glucomannan imitation silk slurry; (4) Preparation of konjac glucomannan fiber wet wipes: process the konjac glucomannan silk-like slurry in step (3) through a complete set of fiber wet spinning equipment to obtain fiber wet wipes; The mass volume ratio is g/mL. 2. the konjac glucomannan fiber wet tissue prepared by the method of claim 1.