CN114351471A - Skin-friendly underwear without itching feeling and preparation method thereof - Google Patents
Skin-friendly underwear without itching feeling and preparation method thereof Download PDFInfo
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- CN114351471A CN114351471A CN202210026153.8A CN202210026153A CN114351471A CN 114351471 A CN114351471 A CN 114351471A CN 202210026153 A CN202210026153 A CN 202210026153A CN 114351471 A CN114351471 A CN 114351471A
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- 208000003251 Pruritus Diseases 0.000 title claims abstract description 59
- 230000007803 itching Effects 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 229920000742 Cotton Polymers 0.000 claims abstract description 129
- 238000005406 washing Methods 0.000 claims abstract description 73
- ALYNCZNDIQEVRV-UHFFFAOYSA-N 4-aminobenzoic acid Chemical compound NC1=CC=C(C(O)=O)C=C1 ALYNCZNDIQEVRV-UHFFFAOYSA-N 0.000 claims abstract description 61
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims abstract description 41
- JQWHASGSAFIOCM-UHFFFAOYSA-M sodium periodate Chemical compound [Na+].[O-]I(=O)(=O)=O JQWHASGSAFIOCM-UHFFFAOYSA-M 0.000 claims abstract description 37
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- 238000002156 mixing Methods 0.000 claims abstract description 28
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims abstract description 27
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- 230000009471 action Effects 0.000 claims abstract description 10
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- 238000012545 processing Methods 0.000 claims abstract description 6
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 66
- 239000007864 aqueous solution Substances 0.000 claims description 58
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- 238000000034 method Methods 0.000 claims description 28
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- 238000009210 therapy by ultrasound Methods 0.000 claims description 17
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- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 239000003599 detergent Substances 0.000 claims description 6
- 238000009940 knitting Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 238000009958 sewing Methods 0.000 claims description 4
- ALYNCZNDIQEVRV-PZFLKRBQSA-N 4-amino-3,5-ditritiobenzoic acid Chemical compound [3H]c1cc(cc([3H])c1N)C(O)=O ALYNCZNDIQEVRV-PZFLKRBQSA-N 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
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- 240000008564 Boehmeria nivea Species 0.000 description 2
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- 229910000428 cobalt oxide Inorganic materials 0.000 description 2
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Landscapes
- Chemical Or Physical Treatment Of Fibers (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a skin-friendly underwear without itching feeling and a preparation method thereof. The skin-friendly underwear without itching is prepared by carrying out enzymolysis on cotton fibers, modifying the cotton fibers by using sodium periodate and 4-aminobenzoic acid after alkali liquor and urea treatment, grafting cobalt chloride on the surfaces of the cotton fibers under the action of ethanolamine, finally blending the cotton fibers with polyurethane fibers, and adopting a seamless integrated processing technology. Compared with the prior art, the skin-friendly underwear without itching feeling prepared by the invention has small itching feeling and good touch comfort; meanwhile, the moisture absorption, ventilation, washing resistance and wear resistance are excellent.
Description
Technical Field
The invention relates to the technical field of textiles, in particular to a skin-friendly underwear without itching feeling and a preparation method thereof.
Background
With the rapid change in fashion and apparel worldwide, consumer selection of apparel depends not only on aesthetics and appearance, but also on the comfort of the apparel. Therefore, many textile-related studies are currently conducted to enhance the functionality of textiles through new technologies using functional textiles. Skin-friendly breathability is a major aspect of improving the comfort of textiles and determines an intuitive feel that textiles bring to the skin and human body, especially for underwear and sportswear. And the seamless integrated underwear processing technology is produced for the purpose of attractive appearance and skin sticking. The internal environment of the skin-friendly side should be effectively exchanged with the atmospheric environment through the fabric in a manner. This involves three main processes, absorption, transfer, and expulsion.
Polyester fiber is a fiber widely used in close-fitting clothes because of its excellent physicochemical and mechanical properties, but it is hydrophobic in nature due to its lack of hydrophilic functional groups in the backbone, and is not liable to absorb moisture, which rapidly causes friction between the skin and wet fabrics, resulting in skin irritation, bacterial infection, itching and rubbing, and discomfort to the wearer. On the other hand, hydrophilic fabrics such as cotton, spandex, etc. have good skin-friendly properties, and have hydrophilicity due to a large number of polar OH groups in their polymer structure, which attract and bind a large number of polar water molecules, but do not allow rapid diffusion and evaporation of water, but rather impart a moist feel to the wearer. There have been many studies on methods by surface modification, and these methods can be basically classified into physical modification and chemical modification. Physical modification can achieve a balance of properties by changing the cross-sectional shape of the fibers, building moisture vapor permeable channels and pores, or using a blend of multicomponent fibers. There are also many methods of chemical modification, including different processes, such as ammonolysis or alkaline hydrolysis reduction, application of hydrophilic materials, irradiation, enzyme modification, plasma treatment, graft copolymerization, modified silicones, etc. However, these methods have disadvantages such as loss of mechanical strength, difficulty in large-scale application, and generation of a large amount of waste water. Cotton fabrics tend to break at points of lower breaking strength during use or processing. Therefore, it is important to improve the burst strength of cotton fiber fabrics, and conventional moisture-absorbent materials, such as zeolite and silica gel, have low water absorption and reduced their ability to absorb moisture from the evaporation of sweat by various chemical treatments using a crosslinking agent. Furthermore, the regeneration of these materials requires high energy consumption from an energy and sustainability perspective. In order to realize skin-friendly ventilation and solve the limitations, the invention develops a cobalt complex-based super-absorbent material, which improves the skin performance of the fabric by blending with polyurethane fiber and adopting a seamless integrated forming process.
CN110250597B discloses a soft antibacterial underwear fabric and a preparation method thereof; the underwear fabric prepared by the invention is soft in texture, has excellent sweat absorption and air permeability, and is comfortable to wear; in addition, the underwear fabric prepared by the invention not only has certain ultraviolet resistance and antistatic function, but also has good antibacterial and bacteriostatic properties, so that the service life of the underwear fabric can be effectively prolonged; through chemical modification of the cotton fiber, hydroxyl and amino on the surface of the chitin and groups on the surface of the cotton fiber can form chemical bonds, so that the chitin can be firmly attached to the surface of the cotton fiber, and the antibacterial performance of the cotton fiber is greatly improved; in addition, the chitin also has a good moisturizing effect, and is cooperated with the flax fibers and the ramie fibers, so that the prepared underwear fabric has a stronger antistatic function. Although the invention improves the antistatic function of underwear, the flax fiber and ramie fiber yarns have more hairiness and are easy to cause itching when contacting with skin.
As underwear is taken as underclothes, the touch comfort of the underwear is more and more emphasized, the comfort degree directly influences human bodies, and the itching feeling is the uncomfortable feeling generated when the underclothes are in contact with the skin of the human bodies, so that the improvement of the itching feeling of the underwear has very important significance.
Disclosure of Invention
In view of the problems of low elasticity, poor skin-friendly air permeability and lack of aesthetic property of the underwear fabric in the prior art, the invention aims to solve the technical problems that sodium periodate and 4-aminobenzoic acid are adopted to modify cotton fibers, then cobalt chloride and ethanolamine are grafted on the surfaces of the cotton fibers, and then the skin-friendly underwear without itching is prepared by a seamless integrated processing technology.
A preparation method of a skin-friendly underwear without itching feeling comprises the following steps of:
step 1, uniformly mixing 70-90 parts of modified fibers, and carrying out carding, drawing and roving; then blending with 10-30 parts of polyurethane fiber, spooling and cabling to prepare elastic yarn;
and 2, seamlessly and integrally weaving the elastic yarns prepared in the step 1 by adopting a weft knitting weave structure to prepare an integrated seamless fabric, and sewing the integrated seamless fabric to prepare the skin-friendly underwear without itching feeling.
Preferably, the carding process in the step 1 is one of carding and combing.
Preferably, the weft knitting structure in the step 2 is one of a weft plain stitch, a rib stitch, a double-reverse side stitch, a variable rib stitch, a single-side jacquard stitch, a double-side jacquard stitch, a single-side tuck stitch and a double-side tuck stitch.
Preferably, the skin-friendly underwear without itching feeling in the step 2 comprises an upper garment and a lower garment.
Preferably, the gram weight of the skin-friendly underwear without itching feeling in the step 2 is 200-600 g/m2。
The preparation method of the modified fiber comprises the following steps:
s1, soaking the cotton fibers in water, adding acid cellulase under the conditions that the temperature is 50-70 ℃ and the pH value is 5-6, carrying out enzymolysis for 1-2 hours, and taking out, washing and airing the cotton fibers after the enzymolysis is finished; soaking in a mixed solution of a NaOH aqueous solution and a urea aqueous solution for 20-30 min, taking out, washing and drying; washing the cotton fibers with a detergent for 10-30 min at the temperature of 30-60 ℃, washing and drying; soaking in alkaline sodium periodate water solution for ultrasonic treatment; washing and drying to prepare pretreated fiber;
s2, adding the pretreated fiber into an acidic solution of 4-aminobenzoic acid, and carrying out ultrasonic treatment; washing and drying to prepare pretreated fiber;
s3, mixing cobalt chloride, ethanolamine and water, adjusting the pH value to 9.5-10.5, adding pretreated fibers, and performing ultrasonic treatment at 40-70 ℃; washing and drying to prepare the modified fiber.
Further preferably, the preparation steps of the modified fiber in the step 1 are as follows, and the parts are all parts by weight:
s1, soaking 20-40 parts of cotton fibers in 40-60 parts of water, adding 0.5-1 part of acid cellulase under the conditions that the temperature is 50-70 ℃ and the pH value is 5-6, carrying out enzymolysis for 1-2 hours, taking out the cotton fibers after the enzymolysis is finished, washing the cotton fibers for 1-3 times with water, and airing the cotton fibers at 20-30 ℃; then soaking the cotton fibers in a mixed solution of NaOH aqueous solution and urea aqueous solution at the temperature of 30-40 ℃ for 20-30 min, wherein the concentration of the NaOH aqueous solution is 100-150 g/L, the concentration of the urea aqueous solution is 10-20 g/L, and the volume ratio of the NaOH aqueous solution to the urea aqueous solution is 2-3: 1, then taking out the cotton fibers, washing the cotton fibers with water for 1-3 times, and airing the cotton fibers at the temperature of 20-30 ℃; washing the cotton fibers for 10-30 min by using a detergent at the temperature of 30-60 ℃; then washing the cotton fibers with water for 1-3 times, and airing at 20-30 ℃; mixing 3-7 parts of sodium periodate and 70-90 parts of water under a dark condition, and adjusting the pH of the solution to 7-9 by using an alkaline regulator to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves; then washing the polyester cotton fiber with water for 1-3 times, and airing at 20-30 ℃ to prepare a pretreated fiber;
s2, adding 5-15 parts of 4-aminobenzoic acid into 80-95 parts of water, and adjusting the pH of the solution to 5-6 by adopting 1-5 wt% of acetic acid aqueous solution to prepare an acidic solution; adding 20-40 parts of the pretreated fiber prepared in the step S1 into an acidic solution, and carrying out ultrasonic treatment; then washing with water for 1-3 times, and drying at 25-35 ℃ to prepare pretreated fibers;
s3, mixing 5-10 parts of cobalt chloride, 2-5 parts of ethanolamine and 70-90 parts of water, adjusting the pH of the solution to 9.5-10.5 by using an alkaline regulator to prepare a cobalt chloride mixed solution, soaking 20-40 parts of the pretreated fiber prepared in the step S2 in the cobalt chloride mixed solution, and performing ultrasonic treatment at 40-70 ℃; washing with water for 1-3 times, and drying at 40-70 ℃ to prepare the modified fiber.
Preferably, the detergent in step S1 is one of a 60-80 wt% ethanol aqueous solution and a 70-85 wt% methanol aqueous solution.
Preferably, the alkaline modifier in steps S1 and S3 is one of 0.1-0.5 wt% calcium hydroxide aqueous solution, 1-5 wt% disodium hydrogen phosphate aqueous solution, 3-8 wt% sodium bicarbonate aqueous solution, 2-8 wt% calcium acetate aqueous solution and 0.1-3 wt% sodium hydroxide aqueous solution.
Preferably, the ultrasonic treatment in steps S1, S2 and S3 has the following process parameters: the ultrasonic frequency is 10-30 kHz, the ultrasonic power is 500-1000W, and the processing time is 20-100 min;
the invention modifies the cotton fiber, and the whole idea is that sodium periodate is adopted to treat under the ultrasonic condition to oxidize the cotton fiber, and the carbon-carbon bond related to the pyranose ring on the cotton fiber is simultaneously broken to form 2, 3-dialdehyde group on the surface of the cotton fiber. The aldehyde group on the cotton fiber reacts with the 4-aminobenzoic acid under an acidic condition to form an amido bond to generate a graft polymer, cobalt ions are generated in situ on the hydroxyl group and the carboxyl group of the graft polymer of the cotton fiber, and the cobalt ions are deposited on the modified cotton fiber through a one-step reaction. The presence of the carboxyl group on the 4-aminobenzoic acid provides an important site for the nucleation and growth of cobalt ions. In addition, the free aldehydes in the 4-aminobenzoic acid are not converted to hydroxyl groups, which can act as nucleation sites for the formation and attachment of cobalt ions on the modified cotton fibers. Therefore, after washing treatment, the functional substance still has strong adhesion performance. In addition, the carboxylate salt of 4-aminobenzoic acid can form metal ion particles as monodentate ligand, while the graft polymer is composed of O, C and N, and cobalt ions are easily deposited on cotton fibers by sonication. The modified fibers are rougher than the untreated virgin fiber surface, which is mainly due to the deposition of cobalt ions on the treated cotton fiber surface. When one ethanolamine molecule is introduced into CoCl2In the matrix, the obtained structure has high symmetry, and the cobalt coordinates with hydroxyl O atoms and amino N atoms of ethanolamine to form a highly amorphous structure. The binding energy value of nitrogen or oxygen is increased due to the electron pair effect of the nitrogen or oxygen atom and the central cobalt ion. Formed frame of highly amorphous structureThe shelves are made up of a compact array of tiny cells, mostly around 10 microns in diameter, similar to the cross-section of a pineapple. Each of the tiny cells consists of uniformly distributed layered channels with a width from a few hundred nanometers to a few micrometers. These channels may serve as transport channels for water molecules. In addition, the surface of the channel contains some mesopores, which is beneficial to enlarging the surface area, and the prepared fabric in a dehydration state absorbs water molecules and reaches a hydration state. When the fabric is exposed to natural sunlight, the adsorbed water is released, the fabric can absorb water molecules again, and the adsorption/release cycle has good stability.
The thermal decomposition of cotton fibers can be divided into three steps: first, the moisture and volatiles were evaporated at 290 ℃. Followed by thermal decomposition of the glycosidic bonds within the fibers. In the last step, carbonization takes place. The thermal decomposition starting temperature of the fiber after 4-aminobenzoic acid treatment became high and the process was slow up to 430 ℃. Then, carbonization of cellulose, which is a main component of cotton fiber, rapidly started from 430 ℃. The reaction of the 4-aminobenzoic acid and the sodium periodate enhances the high-temperature resistance of the fiber, the deposition of the cobalt ions further increases the thermal decomposition temperature of the fiber, and the content of the cobalt ions before and after washing is not greatly reduced, so that the heat resistance of the fabric is not obviously reduced.
There are several possible mechanisms for the antibacterial activity of cobalt ions, such as the formation of reactive oxygen species and cobalt ions leading to cell dysfunction. One of the main mechanisms of the antibacterial action of cobalt ions deposited on the surface of cotton fibers is the formation of active oxygen. Has obvious inhibiting effect on colibacillus and staphylococcus aureus. In previous researches, metal materials are synthesized in situ on the surfaces of modified cotton fibers, and the antibacterial effect is remarkably reduced after washing and abrasion treatment. However, in the invention, the fixing effect of cobalt ions can be enhanced by adding 4-aminobenzoic acid on the cotton fibers.
The ultraviolet protection performance of the fabric depends on the fabric texture, the preparation process, the fabric color, the fabric characteristics, and other additives and finishing agents. The 4-aminobenzoic acid reacts with the cotton fiber treated by the sodium periodate to form an aromatic benzene ring with two functional groups of amido and carboxylic acid, so that the ultraviolet protection performance of the fabric is enhanced. Due to the synergistic effect of the 4-aminobenzoic acid and the cobalt ions on the modified cotton fibers, the ultraviolet absorption performance can be improved through the conjugate reaction, the fabric prepared from the modified fibers has good ultraviolet absorption performance in an ultraviolet (290-320 nm) wave band, and the fabric has the non-toxic characteristic and can be in contact with human skin. The human skin is protected from ultraviolet radiation even after washing and abrasion processes. The washing process improves the uv protection of the fabric because the fabric shrinkage increases the yarn density.
After the cotton fiber is oxidized, the tensile strength of the fiber is reduced because the cellulose structure is broken to form aldehyde groups. The reduction of tensile strength can be reduced by treating the aldehyde groups thus formed with 4-aminobenzoic acid. After the modification of 4-aminobenzoic acid, the in-situ synthesis also improves the mechanical strength of the cotton fiber, even higher than the initial tensile strength of the cotton fiber.
Due to the adoption of the technical scheme, compared with the prior art, the preparation method of the skin-friendly underwear without itching feeling has the advantages that: 1) the skin-friendly underwear without itching feeling is prepared by oxidizing cotton fibers with sodium periodate, adding 4-aminobenzoic acid for grafting reaction, adding cobalt chloride for in-situ deposition, and blending modified fibers and polyurethane fibers. 2) The cobalt chloride is grafted with the cotton fiber under the action of ethanolamine to generate a highly amorphous structure frame, so that the non-itching skin-friendly underwear has good moisture absorption and air permeability. 3) The modified functional component is grafted to the cotton fiber in a chemical bond mode, and the prepared skin-friendly underwear without itching feeling has the advantages of washing resistance and wear resistance. 4) The itchy feeling of underwear is improved by treating cotton fiber with acidic cellulase, aqueous solution of sodium hydroxide and aqueous solution of urea.
Detailed Description
Sources of the main raw materials in the examples:
cotton fiber, Weifang seven cotton spinning Limited, length: 28-39 mm, fineness:
1.10～1.62dtex。
polyurethane fiber, Zhu Chi Yun chemical fiber Co., Ltd., number of holes: 36F, fineness: 45D.
Sodium periodate: shandong Polymer chemistry, Inc., CAS number: 7790-28-5.
4-aminobenzoic acid: wuhan Huaxiang scientific biotechnology limited, CAS No: 150-13-0.
Cobalt chloride: shandong Yiwei Anhua Industrial science Co., Ltd, CAS No.: 7646-79-9.
Ethanolamine: chemical company, Jinan Teng Bo, appearance: white shiny needle crystals, CAS No.: 141-43-5.
Example 1
A preparation method of a skin-friendly underwear without itching feeling comprises the following steps of:
step 1, picking 80 parts of modified fibers by a bale plucker, inputting the fibers into a cotton mixer through a pipeline, uniformly mixing, and performing carding, drawing and roving; then blending with 20 parts of polyurethane fiber, spooling and cabling to prepare elastic yarn; the linear density of the elastic yarn is 32 s/2;
step 2, adopting a seamless knitted underwear machine to carry out weft knitting to form weft plain stitch seamless fabric, and sewing the weft plain stitch seamless fabric to prepare skin-friendly breathable non-itchy upper garment and lower garment, wherein the gram weight of the skin-friendly underwear without itchy feeling is 400g/m2。
The preparation steps of the modified fiber in the step 1 are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70 wt% ethanol water solution for 20min at 50 ℃; then washing the cotton fiber with water for several times, and airing at 25 ℃; mixing 5 parts of sodium periodate and 80 parts of water under the condition of keeping out of the sun, and adjusting the pH of the solution to 8 by adopting a 2 wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by using ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30 min; then washing the cotton fiber with water for 3 times, and airing at 25 ℃ to prepare pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH of the solution to 5.5 by adopting a 2 wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fiber prepared in the step S1 into an acid solution, and treating for 60min under the action of ultrasonic waves, wherein the ultrasonic frequency is 22kHz, and the ultrasonic power is 900W; then washing with water for 2 times, and drying at 30 ℃ to prepare pretreated fiber;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, adjusting the pH value of the solution to 10 by adopting a 2 wt% sodium hydroxide aqueous solution to prepare a cobalt chloride mixed solution, soaking 30 parts of the pretreated fiber prepared in the step S2 in the cobalt chloride mixed solution, and performing ultrasonic treatment at 60 ℃ for 30min, wherein the ultrasonic frequency is 16kHz and the ultrasonic power is 600W; washing with water for 3 times, and drying at 60 deg.C to obtain modified fiber.
Example 2
A skin-friendly undergarment without itching was prepared in substantially the same manner as in example 1, with the only difference being: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this example are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70 wt% ethanol water solution for 20min at 50 ℃; then washing the cotton fiber with water for several times, and airing at 25 ℃; adjusting the pH of 80 parts of water to 8 by adopting a 2 wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by using ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30 min; then washing the cotton fiber with water for 3 times, and airing at 25 ℃ to prepare pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH of the solution to 5.5 by adopting a 2 wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fiber prepared in the step S1 into an acid solution, and treating for 60min under the action of ultrasonic waves, wherein the ultrasonic frequency is 22kHz, and the ultrasonic power is 900W; then washing with water for 2 times, and drying at 30 ℃ to prepare pretreated fiber;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, adjusting the pH value of the solution to 10 by adopting a 2 wt% sodium hydroxide aqueous solution to prepare a cobalt chloride mixed solution, soaking 30 parts of the pretreated fiber prepared in the step S2 in the cobalt chloride mixed solution, and performing ultrasonic treatment at 60 ℃ for 30min, wherein the ultrasonic frequency is 16kHz and the ultrasonic power is 600W; washing with water for 3 times, and drying at 60 deg.C to obtain modified fiber.
Example 3
A skin-friendly undergarment without itching was prepared in substantially the same manner as in example 1, with the only difference being: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this example are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70 wt% ethanol water solution for 20min at 50 ℃; then washing the cotton fiber with water for several times, and airing at 25 ℃; mixing 5 parts of sodium periodate and 80 parts of water under the condition of keeping out of the sun, and adjusting the pH of the solution to 8 by adopting a 2 wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by using ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30 min; then washing the cotton fiber with water for 3 times, and airing at 25 ℃ to prepare pretreated fiber;
s2, adjusting the pH of the solution to 5.5 by using 90 parts of water and 2 wt% acetic acid aqueous solution to prepare an acid solution; adding 30 parts of the pretreated fiber prepared in the step S1 into an acid solution, and treating for 60min under the action of ultrasonic waves, wherein the ultrasonic frequency is 22kHz, and the ultrasonic power is 900W; then washing with water for 2 times, and drying at 30 ℃ to prepare pretreated fiber;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, adjusting the pH value of the solution to 10 by adopting a 2 wt% sodium hydroxide aqueous solution to prepare a cobalt chloride mixed solution, soaking 30 parts of the pretreated fiber prepared in the step S2 in the cobalt chloride mixed solution, and performing ultrasonic treatment at 60 ℃ for 30min, wherein the ultrasonic frequency is 16kHz and the ultrasonic power is 600W; washing with water for 3 times, and drying at 60 deg.C to obtain modified fiber.
Example 4
A skin-friendly undergarment without itching was prepared in substantially the same manner as in example 1, with the only difference being: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this example are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70 wt% ethanol water solution for 20min at 50 ℃; then washing the cotton fiber with water for several times, and airing at 25 ℃; mixing 5 parts of sodium periodate and 80 parts of water under the condition of keeping out of the sun, and adjusting the pH of the solution to 8 by adopting a 2 wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by using ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30 min; then washing the cotton fiber with water for 3 times, and airing at 25 ℃ to prepare pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH of the solution to 5.5 by adopting a 2 wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fiber prepared in the step S1 into an acid solution, and treating for 60min under the action of ultrasonic waves, wherein the ultrasonic frequency is 22kHz, and the ultrasonic power is 900W; then washing with water for 2 times, and drying at 30 ℃ to prepare pretreated fiber;
s3, mixing 4 parts of ethanolamine and 80 parts of water, adjusting the pH value of the solution to 10 by adopting a 2 wt% sodium hydroxide aqueous solution to prepare an alkaline mixed solution, soaking 30 parts of the pretreated fiber prepared in the step S2 in the alkaline mixed solution, and performing ultrasonic treatment at 60 ℃ for 30min, wherein the ultrasonic frequency is 16kHz and the ultrasonic power is 600W; washing with water for 3 times, and drying at 60 deg.C to obtain modified fiber.
Example 5
A preparation method of a skin-friendly underwear without itching feeling comprises the following steps of:
step 1, picking 80 parts of modified fibers by a bale plucker, inputting the fibers into a cotton mixer through a pipeline, uniformly mixing, and performing carding, drawing and roving; then blending with 20 parts of polyurethane fiber, spooling and cabling to prepare elastic yarn; the linear density of the elastic yarn is 32 s/2;
step 2, adopting a seamless knitted underwear machine to carry out weft knitting to form weft plain stitch seamless fabric, and sewing the weft plain stitch seamless fabric to prepare skin-friendly breathable non-itching-feeling upper garment and lower garment without itching feelingThe weight is 400g/m2。
The preparation steps of the modified fiber in the step 1 are as follows, and the parts are all parts by weight:
s1, soaking 30 parts of cotton fibers in 60 parts of water, adding 1 part of acid cellulase at the temperature of 60 ℃ and under the condition that the pH value is 5.5, carrying out enzymolysis for 1.5h, taking out the cotton fibers after the enzymolysis is finished, washing the cotton fibers for 3 times by using water, and airing the cotton fibers at the temperature of 25 ℃; then soaking the cotton fiber in a mixed solution of NaOH aqueous solution and urea aqueous solution at 35 ℃ for 30min, wherein the concentration of the NaOH aqueous solution is 150g/L, the concentration of the urea aqueous solution is 20g/L, and the volume ratio of the NaOH aqueous solution to the urea aqueous solution is 2: 1; then taking out the cotton fiber, washing with water for 3 times, and drying at 25 ℃; washing cotton fiber with 70 wt% ethanol water solution at 50 deg.C for 20 min; then washing the cotton fiber with water for several times, and airing at 25 ℃; mixing 5 parts of sodium periodate and 80 parts of water under the condition of keeping out of the sun, and adjusting the pH of the solution to 8 by adopting a 2 wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by using ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30 min; then washing the cotton fiber with water for 3 times, and airing at 25 ℃ to prepare pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH of the solution to 5.5 by adopting a 2 wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fiber prepared in the step S1 into an acid solution, and treating for 60min under the action of ultrasonic waves, wherein the ultrasonic frequency is 22kHz, and the ultrasonic power is 900W; then washing with water for 2 times, and drying at 30 ℃ to prepare pretreated fiber;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, adjusting the pH value of the solution to 10 by adopting a 2 wt% sodium hydroxide aqueous solution to prepare a cobalt chloride mixed solution, soaking 30 parts of the pretreated fiber prepared in the step S2 in the cobalt chloride mixed solution, and performing ultrasonic treatment at 60 ℃ for 30min, wherein the ultrasonic frequency is 16kHz and the ultrasonic power is 600W; washing with water for 3 times, and drying at 60 deg.C to obtain modified fiber.
Comparative example 1
A skin-friendly undergarment without itching was prepared in substantially the same manner as in example 1, with the only difference being: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this example are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70 wt% ethanol water solution for 20min at 50 ℃; then washing the cotton fiber with water for several times, and airing at 25 ℃; adjusting the pH of 80 parts of water to 8 by adopting a 2 wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by using ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30 min; then washing the cotton fiber with water for 3 times, and airing at 25 ℃ to prepare pretreated fiber;
s2, adjusting the pH of the solution to 5.5 by using 90 parts of water and 2 wt% acetic acid aqueous solution to prepare an acid solution; adding 30 parts of the pretreated fiber prepared in the step S1 into an acid solution, and treating for 60min under the action of ultrasonic waves, wherein the ultrasonic frequency is 22kHz, and the ultrasonic power is 900W; then washing with water for 2 times, and drying at 30 ℃ to prepare pretreated fiber;
s3, mixing 4 parts of ethanolamine and 80 parts of water, adjusting the pH value of the solution to 10 by adopting a 2 wt% sodium hydroxide aqueous solution to prepare an alkaline mixed solution, soaking 30 parts of the pretreated fiber prepared in the step S2 in the alkaline mixed solution, and performing ultrasonic treatment at 60 ℃ for 30min, wherein the ultrasonic frequency is 16kHz and the ultrasonic power is 600W; washing with water for 3 times, and drying at 60 deg.C to obtain modified fiber.
Comparative example 2
A skin-friendly undergarment without itching was prepared in substantially the same manner as in example 1, with the only difference being: and replacing the modified fiber in the step 1 with common cotton fiber without modification treatment.
Test example 1
Limiting oxygen index test
The limiting oxygen index of the examples and comparative examples was determined using a FYH830 critical oxygen index tester according to the test method of GB/T5454-1997 textile flammability test oxygen index method. Each group of materials is tested for three times, the limit oxygen index value is calculated according to a formula, and an average value is taken. The test results are shown in Table 1.
Table 1: limiting oxygen index test results
| Experimental protocol | Limiting oxygen index LOI (%) |
| Example 1 | 33.1 |
| Example 2 | 30.1 |
| Example 3 | 30.3 |
| Example 4 | 29.5 |
| Comparative example 1 | 20.1 |
| Comparative example 2 | 19.8 |
The test result of the limited oxygen index shows that the limited oxygen index of the embodiment 1 is the highest, the flame retardant effect is the best, and the modified skin-friendly breathable seamless integrated underwear is obviously improved in flame retardant property. The possible reason is that the thermal decomposition of cotton fibers can be divided into three steps, first, the evaporation of moisture and volatiles at 290 ℃. Followed by thermal decomposition of the glycosidic bonds within the fibers. In the last step, carbonization takes place. The thermal decomposition starting temperature of the fiber after 4-aminobenzoic acid treatment becomes high and the decomposition process is slow. Then, carbonization of cellulose, which is a main component of cotton fiber, rapidly started from 430 ℃. The reaction of the 4-aminobenzoic acid and the sodium periodate enhances the high-temperature resistance of the fiber, the deposition of cobalt ions further increases the thermal decomposition temperature of the fiber, the cobalt ions are decomposed into cobalt oxide at high temperature, the cobalt oxide is gathered on the surface of the fiber carbon layer to prevent heat transfer and oxygen from entering, a stable barrier is formed, and the heat resistance of the fabric can be enhanced.
Test example 2
Abrasion resistance and antibacterial property test
The abrasion resistance refers to GB/T21196.3-2007 determination part 3 of abrasion resistance of fabrics by Martindale method: determination of the loss of mass ", a disk-type textile mill model YG522 (city electronic instruments, Inc., Lai, China) was used for the test. The sample is cut into a round sample with a single-layer diameter of 125mm, a weight of 300g is selected, the running speed is 60 r/min, and the friction is 5 min. And (4) carrying out antibacterial performance test on the rubbed sample by adopting the following antibacterial performance test method.
The antibacterial performance refers to GB/T20944.3-2008 < evaluation of antibacterial performance of textiles part 3: the test was carried out according to the instructions of the Oscillating method, using Escherichia coli AATCC 8099 and Staphylococcus aureus AATCC 6538 as test strains. Three groups of samples before and after wear resistance are tested to obtain an average value, and the test results are shown in table 2. The antibacterial property of the fabric can be calculated by the following formula:
R＝(B-A)/B×100％
wherein R represents the antibacterial rate, and A, B represents the bacterial concentration of the sample and the control group respectively.
The test results are shown in Table 2.
Table 2: test result of antibacterial property of fabric
It can be seen from table 2 that the antimicrobial performance of the fabric of example 1 was best before and after rubbing, probably due to the formation of active oxygen by cobalt ions and the resulting cell dysfunction of cobalt ions. One of the main mechanisms of the antibacterial action of cobalt ions deposited on the surface of cotton fibers is the formation of active oxygen. Has obvious inhibiting effect on colibacillus and staphylococcus aureus. In previous researches, metal materials are synthesized in situ on the surfaces of modified cotton fibers, and the antibacterial effect is remarkably reduced after abrasion treatment. However, in the invention, the fixing effect of cobalt ions can be enhanced by adding 4-aminobenzoic acid on the cotton fibers.
Test example 3
Test of washable, hygroscopic, quick-drying and air permeability
The method adopts the evaluation part 1 of the moisture absorption quick drying property of the textile in the national standard GB/T21655.1-2008: the moisture absorption and quick drying performance of the fabric is measured by a combination method related in a single combination test method, and the moisture absorption and quick drying performance of the fabric is comprehensively judged by testing the wicking height and the moisture permeability of the weft weaving direction of the fabric.
Referring to GB/T5453-1997 determination of textile fabric air permeability, YG461E-III full-automatic air permeability instrument is adopted, the test aperture is selected to be phi 3, the test pressure difference is 100Pa, and the test area is 20cm2Each sample was tested 10 times and averaged.
According to the washing standard in GB/T3921-2008 'soaping-resistant color fastness of textile color fastness test', a soaping test is carried out by taking a cotton fiber fabric as a lining fabric, after washing once, the fabric is dried, and moisture absorption, quick drying and air permeability tests are carried out according to the same method. The test results are shown in Table 3.
Table 3: test results of washable, hygroscopic, quick-drying and air permeability performances
As can be seen from Table 3, the moisture absorption quick-drying and air permeability before and after washing of example 1 were the best, and the moisture absorption quick-drying and air permeability after washing were less variedOn one hand, the possible reasons are that the fine adjustment between the fibers after washing causes certain shrinkage of the fabric, the density is increased, the pores are reduced, and the moisture absorption and air permeability are reduced; on the other hand, aldehyde groups on the cotton fibers react with 4-aminobenzoic acid under an acidic condition to form amide bonds to generate a graft polymer, so that the roughness of the cotton fibers is increased, the cohesive force of the fibers in the spun fabric is enhanced, and the pores among the fibers are increased; then generating cobalt ions on the hydroxyl and carboxyl of the graft polymer of the cotton fiber in situ, and depositing the cobalt ions on the modified cotton fiber through a one-step reaction. The presence of the carboxyl group on the 4-aminobenzoic acid provides an important site for the nucleation and growth of cobalt ions. In addition, free aldehyde in the 4-aminobenzoic acid is not converted into hydroxyl, and the free aldehyde can serve as a nucleation site for cobalt ions to form and attach on the pretreated cotton fibers, so that the functional components still have strong adhesion performance after washing treatment. In addition, the carboxylate salt of 4-aminobenzoic acid can form metal ion particles as monodentate ligand, while the graft polymer is composed of O, C and N, and cobalt ions are easily deposited on cotton fibers by sonication. When one ethanolamine molecule is introduced into CoCl2In the matrix, the obtained structure has high symmetry, and the cobalt coordinates with a hydroxyl O atom and an amino N atom of ethanolamine. A highly amorphous structure is formed. The binding energy value of nitrogen or oxygen is increased due to the electron pair effect of the nitrogen or oxygen atom and the central cobalt ion. A highly amorphous structured framework is formed, consisting of a compact array of tiny cells, predominantly on the order of 10 microns in diameter, resembling the cross-section of a pineapple. Each of the tiny cells consists of uniformly distributed layered channels with a width from a few hundred nanometers to a few micrometers. These channels may serve as transport channels for water molecules. In addition, the surface of the channel contains some mesopores, which is beneficial to enlarging the surface area, the larger surface area is beneficial to the adsorption of water molecules, and then the water molecules and gas can be transmitted to the outer layer of the fabric through the diffusion of the mesopores, so that the moisture absorption performance of the fabric is improved.
Test example 4
Ultraviolet resistance test
And (3) testing by using a UV-1000F fabric ultraviolet resistance tester according to GB/T18830-2009 evaluation on ultraviolet resistance performance of textiles. The ultraviolet protection factor (UPF value) is used as the main evaluation index of the ultraviolet resistance of the fabric. Each set of samples was tested in triplicate, and the average was taken and the results are shown in Table 4.
Table 4: ultraviolet resistance test results
| Experimental protocol | UPF |
| Example 1 | 59.29 |
| Example 2 | 48.91 |
| Example 3 | 47.31 |
| Example 4 | 45.85 |
| Example 5 | 58.14 |
| Comparative example 1 | 36.22 |
| Comparative example 2 | 25.60 |
The results in Table 3 show that the UV resistance of example 1 is the best, probably because the aromatic benzene ring with two functional groups of amine and carboxylic acid formed by the reaction of the cotton fiber treated by the sodium periodate with 4-aminobenzoic acid enhances the UV protection performance of the fabric. Due to the synergistic effect of the 4-aminobenzoic acid and the cobalt ions on the modified cotton fibers, the ultraviolet absorption performance can be improved through the conjugate reaction, the fabric prepared from the modified fibers has good ultraviolet absorption performance in an ultraviolet (290-320 nm) wave band, and the fabric has the non-toxic characteristic and can be in contact with human skin.
Test example 5
Testing the itching feeling:
the non-itchy skin-friendly underwear prepared in examples 1 and 5 was subjected to the itchy feeling test according to the test method in journal of textile science, volume 37, 12 (evaluation method of itchy feeling of underwear fabric, author: zhangjinxu, suzhou university, 2016), and the evaluation scale for itchy feeling was:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| very no itching | Without itching | Relatively free from itching | In general | Comparison of itching | Itching (itching) | Very scratchy |
The test results are shown in table 5:
table 5: skin-friendly underwear scratchiness test result table without scratchiness
| Scratchiness score | |
| Example 1 | 2.8 |
| Example 5 | 1.6 |
From the experimental data in table 5, it can be seen that the itchy feeling score of the non-itchy skin-friendly underwear prepared from the modified cotton fiber treated with the acid cellulase, the aqueous sodium hydroxide solution and the aqueous urea solution has the minimum value, and the smaller the itchy feeling score value, the better the comfortable feeling of the underwear is indicated, and the possible reason is that the cellulose content in the cotton fiber is higher, and after the cellulose in the cotton fiber is degraded by the acid cellulase, the surface of the cotton fiber can be effectively softened or the surface hairiness of the cotton fiber can be removed, the gap inside the fiber is increased by the etching action of the enzyme, the rigidity of the cotton fiber is reduced, and then the cotton threads are finished by the aqueous sodium hydroxide solution and the aqueous urea solution, so that the number of the surface hairiness of the cotton fiber is reduced, and the anti-mercerization effect of the cotton fiber is further improved.
Claims (10)
1. A preparation method of a skin-friendly underwear without itching feeling is characterized by comprising the following steps: carrying out enzymolysis on cotton fibers, modifying the cotton fibers by using sodium periodate and 4-aminobenzoic acid after treating alkali liquor and urea, grafting cobalt chloride and ethanolamine on the surfaces of the cotton fibers under the action of ethanolamine, finally blending the cotton fibers with polyurethane fibers, and then preparing the non-itchy skin-friendly underwear by a seamless integrated processing technology.
2. The method of making a non-itchy skin-friendly undergarment according to claim 1 comprising the steps of:
step 1, uniformly mixing 70-90 parts of modified fibers, and carrying out carding, drawing and roving; then blending with 10-30 parts of polyurethane fiber, spooling and cabling to prepare elastic yarn;
and 2, seamlessly and integrally weaving the elastic yarns prepared in the step 1 by adopting a weft knitting weave structure to prepare an integrated seamless fabric, and sewing the integrated seamless fabric to prepare the skin-friendly underwear without itching feeling.
The preparation method of the modified fiber comprises the following steps:
s1, soaking the cotton fibers in water, adding acid cellulase under the conditions that the temperature is 50-70 ℃ and the pH value is 5-6, carrying out enzymolysis for 1-2 hours, and taking out, washing and airing the cotton fibers after the enzymolysis is finished; soaking in a mixed solution of a NaOH aqueous solution and a urea aqueous solution for 20-30 min, taking out, washing and drying; washing the cotton fibers with a detergent for 10-30 min at the temperature of 30-60 ℃, washing and drying; soaking in alkaline sodium periodate water solution for ultrasonic treatment; washing and drying to prepare pretreated fiber;
s2, adding the pretreated fiber into an acidic solution of 4-aminobenzoic acid, and carrying out ultrasonic treatment; washing and drying to prepare pretreated fiber;
s3, mixing cobalt chloride, ethanolamine and water, adjusting the pH value to 9.5-10.5, adding pretreated fibers, and performing ultrasonic treatment at 40-70 ℃; washing and drying to prepare the modified fiber.
3. The method for preparing the itchy-feeling skin-friendly underwear as claimed in claim 2, wherein the method for preparing the modified fibers comprises the following steps of:
s1, soaking 20-40 parts of cotton fibers in 40-60 parts of water, adding 0.5-1 part of acid cellulase under the conditions that the temperature is 50-70 ℃ and the pH value is 5-6, carrying out enzymolysis for 1-2 hours, taking out the cotton fibers after the enzymolysis is finished, washing the cotton fibers for 1-3 times with water, and airing the cotton fibers at 20-30 ℃; then soaking the cotton fibers in a mixed solution of NaOH aqueous solution and urea aqueous solution at the temperature of 30-40 ℃ for 20-30 min, wherein the concentration of the NaOH aqueous solution is 100-150 g/L, the concentration of the urea aqueous solution is 10-20 g/L, and the volume ratio of the NaOH aqueous solution to the urea aqueous solution is 2-3: 1, then taking out the cotton fibers, washing the cotton fibers with water for 1-3 times, and airing the cotton fibers at the temperature of 20-30 ℃; washing the cotton fibers for 10-30 min by using a detergent at the temperature of 30-60 ℃; then washing the cotton fibers with water for 1-3 times, and airing at 20-30 ℃; mixing 3-7 parts of sodium periodate and 70-90 parts of water under a dark condition, and adjusting the pH of the solution to 7-9 by using an alkaline regulator to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves; then washing the polyester cotton fiber with water for 1-3 times, and airing at 20-30 ℃ to prepare a pretreated fiber;
s2, adding 5-15 parts of 4-aminobenzoic acid into 80-95 parts of water, and adjusting the pH of the solution to 5-6 by adopting 1-5 wt% of acetic acid aqueous solution to prepare an acidic solution; adding 20-40 parts of the pretreated fiber prepared in the step S1 into an acidic solution, and carrying out ultrasonic treatment; then washing with water for 1-3 times, and drying at 25-35 ℃ to prepare pretreated fibers;
s3, mixing 5-10 parts of cobalt chloride, 2-5 parts of ethanolamine and 70-90 parts of water, adjusting the pH of the solution to 9.5-10.5 by using an alkaline regulator to prepare a cobalt chloride mixed solution, soaking 20-40 parts of the pretreated fiber prepared in the step S2 in the cobalt chloride mixed solution, and performing ultrasonic treatment at 40-70 ℃; washing with water for 1-3 times, and drying at 40-70 ℃ to prepare the modified fiber.
4. The method for preparing a non-itchy skin-friendly undergarment according to claim 2, wherein the carding step in step 1 is one of carding and combing.
5. The method for preparing a skin-friendly underwear without itching feeling of claim 2, wherein the weft knitting weave structure in the step 2 is one of weft plain stitch, rib weave, links-links, varied rib weave, single-side jacquard weave, double-side jacquard weave, single-side tuck weave and double-side tuck weave.
6. The method for preparing a non-itchy skin-friendly undergarment according to claim 2, wherein the non-itchy skin-friendly undergarment of step 2 comprises an upper garment and a lower garment.
7. The method for preparing the non-itchy skin-friendly underwear according to claim 2, wherein the gram weight of the non-itchy skin-friendly underwear in the step 2 is 200-600 g/m2。
8. The method for preparing a non-itching skin-friendly undergarment according to claim 2, wherein the detergent in step S1 is one of a 60-80 wt% ethanol aqueous solution and a 70-85 wt% methanol aqueous solution.
9. The method of claim 2, wherein the alkalinity adjusting agent in steps S1 and S3 is one of 0.1-0.5 wt% calcium hydroxide aqueous solution, 1-5 wt% disodium hydrogen phosphate aqueous solution, 3-8 wt% sodium bicarbonate aqueous solution, 2-8 wt% calcium acetate aqueous solution and 0.1-3 wt% sodium hydroxide aqueous solution.
10. A skin-friendly underwear without itching feeling is characterized in that: prepared by the method of any one of claims 1 to 9.
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