CN114351471B - 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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- CN114351471B CN114351471B CN202210026153.8A CN202210026153A CN114351471B CN 114351471 B CN114351471 B CN 114351471B CN 202210026153 A CN202210026153 A CN 202210026153A CN 114351471 B CN114351471 B CN 114351471B
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- 208000003251 Pruritus Diseases 0.000 title claims abstract description 61
- 230000007803 itching Effects 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
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- 238000005406 washing Methods 0.000 claims abstract description 64
- ALYNCZNDIQEVRV-UHFFFAOYSA-N 4-aminobenzoic acid Chemical compound NC1=CC=C(C(O)=O)C=C1 ALYNCZNDIQEVRV-UHFFFAOYSA-N 0.000 claims abstract description 57
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims abstract description 35
- JQWHASGSAFIOCM-UHFFFAOYSA-M sodium periodate Chemical compound [Na+].[O-]I(=O)(=O)=O JQWHASGSAFIOCM-UHFFFAOYSA-M 0.000 claims abstract description 31
- 229960004050 aminobenzoic acid Drugs 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 26
- 238000002156 mixing Methods 0.000 claims abstract description 26
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- 238000000034 method Methods 0.000 claims description 20
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- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 8
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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 skin-friendly underwear without itching feeling and a preparation method thereof. The skin-friendly underwear without itching feeling is prepared by carrying out enzymolysis on cotton fibers, adopting sodium periodate and 4-aminobenzoic acid to modify the cotton fibers after alkali liquor and urea treatment, grafting cobalt chloride on the surfaces of the cotton fibers under the action of ethanolamine, and finally blending the cobalt chloride with polyurethane fibers, and adopting a seamless integrated processing technology. Compared with the prior art, the skin-friendly underwear without itching feeling has small itching feeling and good touch feeling comfort; meanwhile, the moisture absorption, ventilation, washing resistance and wear resistance are excellent.
Description
Technical Field
The invention relates to the technical field of textile, in particular to skin-friendly underwear without itching feeling and a preparation method thereof.
Background
With worldwide fashion and rapid changes in apparel, consumer selection of apparel depends not only on aesthetics and appearance, but also on the comfort of the apparel. Accordingly, there are many textile-related studies to enhance the functionality of textiles through the use of new technologies for functional textiles. Skin-friendly breathability is a major aspect of improving textile comfort and it determines an intuitive feel that textiles bring to the skin and human body, especially for underwear and sportswear. In addition, for beautiful skin, seamless integrated underwear processing technology is generated. The inner environment of the skin-friendly side should be effectively exchanged with the atmosphere through the fabric in a manner. This involves three main processes, absorption, transfer and evacuation.
Polyester fiber is a fiber widely used in close-fitting clothing because of its excellent physicochemical and mechanical properties, but is hydrophobic in nature due to lack of hydrophilic functional groups in its skeleton, and is not easy to absorb moisture, which rapidly causes friction between skin and wet fabrics, causes skin irritation, bacterial infection, itching and friction, and causes discomfort to the wearer. On the other hand, hydrophilic fabrics such as cotton, spandex, etc. are excellent in skin-friendly properties, and because of their polymer structure having a large number of polar OH groups, attract and bind a large number of polar water molecules, and thus are hydrophilic, but this does not allow water diffusion and evaporation to be accelerated, but rather gives a wet feel to the wearer. There have been many studies on methods of surface modification, which 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 fiber, building moisture and air permeable channels and pores, or blending with multicomponent fibers. There are also many chemical modification methods including various processes such as ammonolysis or alkaline hydrolysis reduction, application of hydrophilic materials, irradiation, enzyme modification, plasma treatment, graft copolymerization, modification of silicones, and the like. However, these treatment methods have certain drawbacks, such as loss of mechanical strength, difficulty in large-scale application, and generation of a large amount of wastewater. The cotton fabric breaks at a place where the breaking strength is low during use or processing. Therefore, it is important to improve the burst strength of cotton fabrics, and conventional hygroscopic materials such as zeolite and silica gel have low water absorption by performing various chemical treatments using a crosslinking agent, and their ability to absorb moisture from sweat evaporation is weakened. Furthermore, regeneration of these materials requires higher energy consumption from the standpoint of energy and sustainability. In order to realize skin-friendly ventilation and solve the limitations, the invention develops a cobalt complex-based super-absorbent material, and improves the skin performance of the fabric by blending with polyurethane fibers and adopting a seamless integral molding process.
CN110250597B discloses a soft antibacterial underwear fabric and a preparation method thereof; the underwear fabric prepared by the method is soft in texture, excellent in sweat absorption and air permeability and comfortable to wear; in addition, the underwear fabric prepared by the method has certain ultraviolet resistance and antistatic function and 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 can form chemical bonds with groups on the surface of the cotton fiber, so that the chitin can be firmly attached to the surface of the cotton fiber, and the antibacterial property of the cotton fiber is greatly improved; in addition, the chitin also has good moisturizing effect, and the chitin is mutually cooperated with flax fiber and ramie fiber, so that the antistatic function of the prepared underwear fabric is stronger. Although the antistatic function of the underwear is improved, the invention has more hairiness of flax fiber and ramie fiber yarns, and is easy to cause itching when contacting with skin.
As underwear, the touch comfort of the underwear is more and more important, the comfort degree of the underwear directly affects the human body, and the itching feeling is uncomfortable feeling generated when the underwear is contacted with the skin of the human body, so that the itching feeling of the underwear is improved.
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 technical problem to be solved by the invention is to modify cotton fibers by adopting sodium periodate and 4-aminobenzoic acid, then graft cobalt chloride and ethanolamine on the surfaces of the cotton fibers, and then prepare the skin-friendly underwear without itching feeling through a seamless integrated processing technology.
The preparation method of the skin-friendly underwear without itching feeling comprises the following steps of:
step 1, uniformly mixing 70-90 parts of modified fibers, and carding, drawing and roving; then blending with 10-30 parts of polyurethane fiber, winding and twisting to prepare elastic yarn;
and 2, performing seamless integrated knitting on the elastic yarns prepared in the step 1 by adopting a weft knitting 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 weft plain stitch structure, rib stitch structure, double-back surface structure, variable rib stitch structure, single-sided jacquard weave structure, double-sided jacquard weave structure, single-sided tuck structure and double-sided tuck structure.
Preferably, the skin-friendly underwear without itching feeling in the step 2 comprises a jacket and a lower jacket.
Preferably, the gram weight of the skin-friendly underwear without itching feeling in the step 2 is 200-600 g/m 2 。
The preparation method of the modified fiber comprises the following steps:
s1, soaking cotton fibers in water, adding acid cellulase under the conditions of 50-70 ℃ and pH of 5-6, carrying out enzymolysis for 1-2 h, and taking out, washing and airing after the enzymolysis is finished; soaking in the mixed solution of NaOH aqueous solution and urea aqueous solution for 20-30 min, taking out, washing and airing; washing cotton fiber with detergent at 30-60 deg.c for 10-30 min, flushing and air drying; soaking in alkaline sodium periodate aqueous solution for ultrasonic treatment; washing and airing to prepare pretreated fibers;
s2, adding the pretreated fibers into an acidic solution of 4-aminobenzoic acid, and carrying out ultrasonic treatment; washing and drying to prepare pretreated fibers;
s3, mixing cobalt chloride, ethanolamine and water, adjusting the pH value to 9.5-10.5, adding pretreated fibers, and carrying out 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 of 50-70 ℃ and pH of 5-6, carrying out enzymolysis for 1-2 hours, taking out the cotton fibers after the enzymolysis is finished, washing for 1-3 times with water, and airing at 20-30 ℃; then soaking cotton fibers in a mixed solution of NaOH aqueous solution and urea aqueous solution at 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, 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 20-30 ℃; washing cotton fiber with detergent at 30-60 deg.c for 10-30 min; then washing cotton fiber 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 the light-shielding condition, and regulating the pH value of the solution to 7-9 by adopting 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 cotton fiber with water for 1-3 times, airing at 20-30 ℃ to prepare pretreatment fiber;
s2, adding 5-15 parts of 4-aminobenzoic acid into 80-95 parts of water, and adjusting the pH value 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 fibers prepared in the step S1 into an acidic solution, and carrying out ultrasonic treatment; then washing with water for 1-3 times, 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, regulating the pH value of the solution to 9.5-10.5 by adopting an alkaline regulator to prepare a cobalt chloride mixed solution, soaking 20-40 parts of the pretreated fibers prepared in the step S2 in the cobalt chloride mixed solution, and carrying out 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 the step S1 is one of 60-80 wt% ethanol water solution and 70-85 wt% methanol water solution.
Preferably, the alkaline regulator in the steps S1 and S3 is one of 0.1-0.5 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 process parameters of the ultrasonic treatment in the steps S1, S2, S3 are each independently: the ultrasonic frequency is 10-30 kHz, the ultrasonic power is 500-1000W, and the treatment time is 20-100 min;
the invention modifies cotton fiber, and the whole idea is that sodium periodate is adopted to oxidize the cotton fiber under the ultrasonic condition, and related carbon-carbon bonds on a pyranose ring on the cotton fiber are simultaneously broken, so that 2, 3-dialdehyde groups are formed on the surface of the cotton fiber. The addition of these aldehyde groups to 4-aminobenzoic acid hasThe aldehyde group on the cotton fiber reacts with 4-aminobenzoic acid under an acidic condition to form an amide bond to form a graft polymer, cobalt ions are generated in situ on hydroxyl and carboxyl groups of the graft polymer of the cotton fiber, and the cobalt ions are deposited on the modified cotton fiber through one-step reaction. The presence of carboxyl groups on 4-aminobenzoic acid provides an important site for nucleation and growth of cobalt ions. In addition, the free aldehydes in 4-aminobenzoic acid are not converted to hydroxyl groups, they can act as nucleation sites for cobalt ions to form and attach to the modified cotton fibers. Therefore, after washing treatment, the functional substance still has stronger adhesion performance. In addition, carboxylate salts of 4-aminobenzoic acid can form metal ion particles as monodentate ligands, while the graft polymer consists of O, C and N, cobalt ions being easily deposited on cotton fibers by ultrasonic treatment. The modified fibers were rougher than the untreated virgin fiber surfaces, mainly due to cobalt ion deposition on the treated cotton fiber surfaces. When an ethanolamine molecule is introduced into CoCl 2 In the matrix, the obtained structure has high symmetry, and 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 increases due to the electron pair effect of the nitrogen or oxygen atom and the central cobalt ion. The resulting highly amorphous structure of the framework is composed of a compact array of tiny cells, mainly around 10 microns in diameter, resembling the cross section of a pineapple. Each microcell consists of uniformly distributed layered channels ranging in width from a few hundred nanometers to a few micrometers. These channels may act as transport channels for water molecules. In addition, the channel surface contains some mesopores, which is helpful for enlarging the surface area, and the prepared fabric in a dehydration state adsorbs water molecules and reaches a hydration state. When the fabric is exposed to natural sunlight, the adsorbed water is released, the fabric can reabsorb water molecules, and the fabric has good stability in adsorption/release cycle.
Thermal decomposition of cotton fibers can be divided into three steps: first, moisture and volatiles were evaporated at 290 ℃. Followed by thermal decomposition of the glycosidic linkages within the fiber. In the final step, carbonization occurs. The thermal decomposition starting temperature of the fiber after the 4-aminobenzoic acid treatment became high and the process was slow up to 430 ℃. Carbonization of cellulose, the main component of cotton fibers, then begins rapidly at 430 ℃. The reaction of 4-aminobenzoic acid and sodium periodate enhances the high temperature tolerance of the fiber, the deposition of cobalt ions further increases the thermal decomposition temperature of the fiber, and the content of cobalt ions is not greatly reduced before and after washing, and the heat resistance of the fabric is not remarkably reduced.
There are several possible mechanisms of antibacterial activity of cobalt ions, such as the formation of reactive oxygen species and cobalt ions leading to cellular dysfunction. One of the main mechanisms of antimicrobial action of cobalt ions deposited on the surface of cotton fibers is the formation of reactive oxygen species. Has obvious inhibiting effect on colibacillus and staphylococcus aureus. In the prior art, the antibacterial effect is remarkably reduced after the metal material is synthesized on the surface of the modified cotton fiber in situ and is washed and abraded. However, in the invention, the effect of fixing cobalt ions can be enhanced by adding 4-aminobenzoic acid to cotton fibers.
The ultraviolet resistance of the fabric depends on the fabric texture, the preparation process, the color of the fabric, the characteristics of the fabric itself and other additives and finishing agents. The 4-aminobenzoic acid reacts with cotton fibers treated by sodium periodate to form an aromatic benzene ring with two functional groups of amino 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 cobalt ions on the modified cotton fiber, the conjugation reaction can improve the ultraviolet absorption performance, has good ultraviolet absorption performance in an ultraviolet (290-320 nm) wave band for the fabric prepared from the modified fiber, has the characteristic of no toxicity, and can be contacted with human skin. The human skin is protected from ultraviolet radiation even after the washing and abrasion process. The washing process improves the ultraviolet resistance of the fabric because the shrinkage of the fabric increases the yarn density.
After oxidation of cotton fibers, the tensile strength of the fibers is reduced due to the formation of aldehyde groups formed by the cleavage of the cellulose structure. The reduction of the tensile strength can be reduced by treating the produced aldehyde group with 4-aminobenzoic acid. After modification by 4-aminobenzoic acid, the mechanical strength of the cotton fiber is improved by in-situ synthesis, and is 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 modified fiber prepared by adding cobalt chloride for in-situ deposition and polyurethane fiber are blended to prepare the skin-friendly underwear without itching feeling, which has the characteristics of antibiosis and high temperature resistance. 2) The cobalt chloride is grafted with cotton fiber under the action of ethanolamine to produce a framework with a highly amorphous structure, so that the skin-friendly underwear without itching feeling has good moisture absorption and air permeability. 3) The modified functional component is grafted to 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) After the cotton fiber is treated by the acidic cellulose and the aqueous solution of sodium hydroxide and the aqueous solution of urea, the itching feeling of the underwear is improved.
Detailed Description
The sources of the main raw materials in the examples:
cotton fiber, weifang seven cotton spinning limited company, length: 28-39 mm, fineness:
1.10～1.62dtex。
polyurethane fiber, available from cloud chemical fiber limited, pore number: 36F, fineness: 45D.
Sodium periodate: shandong polymer chemistry Co., ltd., CAS number: 7790-28-5.
4-aminobenzoic acid: wuhan Hua Xiangke, jie Biotechnology Co., ltd., CAS number: 150-13-0.
Cobalt chloride: shandong Yiwei Anhua chemical engineering Co., ltd., CAS number: 7646-79-9.
Ethanolamine: jinan Tengbo chemical Co., ltd., appearance: white shiny needle crystals, CAS no: 141-43-5.
Example 1
The preparation method of the skin-friendly underwear without itching feeling comprises the following steps of:
step 1, 80 parts of modified fibers are subjected to cotton picking by a cotton picking machine, and are input into a cotton mixing machine through a pipeline to be uniformly mixed, and carding, drawing and roving are carried out; then blending with 20 parts of polyurethane fiber, winding and twisting to prepare elastic yarn; the linear density of the elastic yarn is 32s/2;
step 2, knitting Cheng Weiping needle tissue seamless fabric by adopting a seamless knitted underwear machine, and sewing the weft plain tissue seamless fabric to prepare the skin-friendly breathable itching-free upper garment and the lower garment, wherein the gram weight of the itching-free skin-friendly underwear is 400g/m 2 。
The preparation method of the modified fiber in the step 1 comprises the following steps of:
s1, washing 30 parts of cotton fibers with 70wt% ethanol water solution for 20min at 50 ℃; washing cotton fiber with water for several times, and air drying at 25deg.C; mixing 5 parts of sodium periodate and 80 parts of water under a light-shielding condition, and adjusting the pH of the solution to 8 by adopting a 2wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30min; washing cotton fiber with water for 3 times, and air drying at 25deg.C to obtain pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH value of the solution to 5.5 by adopting a 2wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fibers prepared in the step S1 into an acidic 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, drying at 30 ℃ to prepare pretreated fibers;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, regulating the pH value of the solution to 10 by adopting a 2wt% 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 carrying out 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 ℃ to prepare the modified fiber.
Example 2
The preparation method of the skin-friendly underwear without itching feeling is basically the same as that of the example 1, and the only difference is that: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this embodiment are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70wt% ethanol water solution for 20min at 50 ℃; washing cotton fiber with water for several times, and air drying at 25deg.C; adjusting the pH value of 80 parts of water to 8 by adopting a 2wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30min; washing cotton fiber with water for 3 times, and air drying at 25deg.C to obtain pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH value of the solution to 5.5 by adopting a 2wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fibers prepared in the step S1 into an acidic 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, drying at 30 ℃ to prepare pretreated fibers;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, regulating the pH value of the solution to 10 by adopting a 2wt% 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 carrying out 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 ℃ to prepare the modified fiber.
Example 3
The preparation method of the skin-friendly underwear without itching feeling is basically the same as that of the example 1, and the only difference is that: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this embodiment are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70wt% ethanol water solution for 20min at 50 ℃; washing cotton fiber with water for several times, and air drying at 25deg.C; mixing 5 parts of sodium periodate and 80 parts of water under a light-shielding condition, and adjusting the pH of the solution to 8 by adopting a 2wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30min; washing cotton fiber with water for 3 times, and air drying at 25deg.C to obtain pretreated fiber;
s2, adjusting the pH value of 90 parts of water to 5.5 by adopting a 2wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fibers prepared in the step S1 into an acidic 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, drying at 30 ℃ to prepare pretreated fibers;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, regulating the pH value of the solution to 10 by adopting a 2wt% 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 carrying out 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 ℃ to prepare the modified fiber.
Example 4
The preparation method of the skin-friendly underwear without itching feeling is basically the same as that of the example 1, and the only difference is that: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this embodiment are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70wt% ethanol water solution for 20min at 50 ℃; washing cotton fiber with water for several times, and air drying at 25deg.C; mixing 5 parts of sodium periodate and 80 parts of water under a light-shielding condition, and adjusting the pH of the solution to 8 by adopting a 2wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30min; washing cotton fiber with water for 3 times, and air drying at 25deg.C to obtain pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH value of the solution to 5.5 by adopting a 2wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fibers prepared in the step S1 into an acidic 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, drying at 30 ℃ to prepare pretreated fibers;
s3, mixing 4 parts of ethanolamine and 80 parts of water, regulating the pH value of the solution to 10 by adopting a 2wt% 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 carrying out 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 ℃ to prepare the modified fiber.
Example 5
The preparation method of the skin-friendly underwear without itching feeling comprises the following steps of:
step 1, 80 parts of modified fibers are subjected to cotton picking by a cotton picking machine, and are input into a cotton mixing machine through a pipeline to be uniformly mixed, and carding, drawing and roving are carried out; then blending with 20 parts of polyurethane fiber, winding and twisting to prepare elastic yarn; the linear density of the elastic yarn is 32s/2;
step 2, knitting Cheng Weiping needle tissue seamless fabric by adopting a seamless knitted underwear machine, and sewing the weft plain tissue seamless fabric to prepare the skin-friendly breathable itching-free upper garment and the lower garment, wherein the gram weight of the itching-free skin-friendly underwear is 400g/m 2 。
The preparation method of the modified fiber in the step 1 comprises the following steps of:
s1, soaking 30 parts of cotton fibers in 60 parts of water, adding 1 part of acid cellulase under the condition of 60 ℃ and pH of 5.5, performing enzymolysis for 1.5 hours, taking out the cotton fibers after the enzymolysis is finished, washing 3 times with water, and airing at 25 ℃; then soaking cotton fibers in a mixed solution of an NaOH aqueous solution and a 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 cotton fiber, washing with water for 3 times, and air drying at 25deg.C; washing cotton fiber with 70wt% ethanol water solution at 50deg.C for 20min; washing cotton fiber with water for several times, and air drying at 25deg.C; mixing 5 parts of sodium periodate and 80 parts of water under a light-shielding condition, and adjusting the pH of the solution to 8 by adopting a 2wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30min; washing cotton fiber with water for 3 times, and air drying at 25deg.C to obtain pretreated fiber;
s2, adding 10 parts of 4-aminobenzoic acid into 90 parts of water, and adjusting the pH value of the solution to 5.5 by adopting a 2wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fibers prepared in the step S1 into an acidic 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, drying at 30 ℃ to prepare pretreated fibers;
s3, mixing 8 parts of cobalt chloride, 4 parts of ethanolamine and 80 parts of water, regulating the pH value of the solution to 10 by adopting a 2wt% 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 carrying out 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 ℃ to prepare the modified fiber.
Comparative example 1
The preparation method of the skin-friendly underwear without itching feeling is basically the same as that of the example 1, and the only difference is that: the preparation method of the modified fiber in the step 1 is different.
The preparation steps of the modified fiber in this embodiment are as follows, and the parts are all parts by weight:
s1, washing 30 parts of cotton fibers with 70wt% ethanol water solution for 20min at 50 ℃; washing cotton fiber with water for several times, and air drying at 25deg.C; adjusting the pH value of 80 parts of water to 8 by adopting a 2wt% disodium hydrogen phosphate aqueous solution to prepare a mixed solution; soaking cotton fibers in the mixed solution, and treating the mixed solution by adopting ultrasonic waves, wherein the ultrasonic frequency is 20kHz, the ultrasonic power is 750W, and the treatment time is 30min; washing cotton fiber with water for 3 times, and air drying at 25deg.C to obtain pretreated fiber;
s2, adjusting the pH value of 90 parts of water to 5.5 by adopting a 2wt% acetic acid aqueous solution to prepare an acidic solution; adding 30 parts of the pretreated fibers prepared in the step S1 into an acidic 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, drying at 30 ℃ to prepare pretreated fibers;
s3, mixing 4 parts of ethanolamine and 80 parts of water, regulating the pH value of the solution to 10 by adopting a 2wt% 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 carrying out 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 ℃ to prepare the modified fiber.
Comparative example 2
The preparation method of the skin-friendly underwear without itching feeling is basically the same as that of the example 1, and the only difference is that: and (3) replacing the modified fiber in the step (1) with a common cotton fiber, and performing no modification treatment.
Test example 1
Limiting oxygen index test
The limiting oxygen indices of the examples and comparative examples were determined using a FYH830 critical oxygen index tester according to the test method of GB/T5454-1997 oxygen index for textile combustion Performance test. Each group of materials is tested three times, limiting oxygen index values are calculated according to a formula, and an average value is obtained. 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 limiting oxygen index shows that the limiting oxygen index of the embodiment 1 is highest, the flame retardant effect is best, and the modified flame retardant property of the skin-friendly breathable seamless integrated underwear is obviously improved. 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 linkages within the fiber. In the final step carbonization occurs. The thermal decomposition starting temperature of the fiber after the 4-aminobenzoic acid treatment becomes high and the decomposition process is slow. Carbonization of cellulose, the main component of cotton fibers, then begins rapidly at 430 ℃. The reaction of 4-aminobenzoic acid and sodium periodate enhances the high temperature tolerance of the fiber, the deposition of cobalt ions further enhances the thermal decomposition temperature of the fiber, the cobalt ions are degraded into cobalt oxides at high temperature, the cobalt oxides are gathered on the surface of the fiber carbon layer, the heat transfer and the oxygen entering are prevented, a stable barrier is formed, and the heat resistance of the fabric can be enhanced.
Test example 2
Wear-resistant antibacterial property test
Abrasion resistance reference GB/T21196.3-2007 "determination of abrasion resistance of textile Martindale method fabrics part 3: determination of quality loss using YG522 disc fabric flat grinder (Lyocell electronic instruments Co., ltd.). The sample is cut into a round sample with a single-layer diameter of 125mm, a 300g heavy hammer is selected, the running speed is 60 revolutions per minute, and the friction is 5 minutes. The rubbed sample was subjected to antibacterial property test by the following antibacterial property test method.
Antibacterial Properties reference GB/T20944.3-2008 section 3 evaluation of antibacterial Properties of textiles: the test was carried out using E.coli AATCC 8099 and Staphylococcus aureus AATCC 6538 as test species. Three groups of samples before and after abrasion resistance were averaged and the test results are shown in table 2. The antimicrobial properties of fabrics can be calculated using the following formula:
R＝(B-A)/B×100％
wherein R represents the antibacterial ratio, and A, B is the bacterial concentration of the sample and the control group, respectively.
The test results are shown in Table 2.
Table 2: antibacterial property test result of fabric
It can be seen from table 2 that the antibacterial properties of the fabric of example 1 are best before and after rubbing, probably because cobalt ions form active oxygen and cobalt ions causing cell dysfunction. One of the main mechanisms of antimicrobial action of cobalt ions deposited on the surface of cotton fibers is the formation of reactive oxygen species. Has obvious inhibiting effect on colibacillus and staphylococcus aureus. In the prior art, the antibacterial effect is remarkably reduced after the metal material is synthesized on the surface of the modified cotton fiber in situ and subjected to abrasion treatment. However, in the invention, the effect of fixing cobalt ions can be enhanced by adding 4-aminobenzoic acid to cotton fibers.
Test example 3
Wash-resistant moisture-absorbing quick-drying and air permeability test
Evaluation of moisture absorption and quick drying Property of textiles by national Standard GB/T21655.1-2008 part 1: the moisture absorption and quick drying performance of the fabric is measured by a combination method related to 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 fabric in the weft knitting direction.
Referring to GB/T5453-1997 "determination of textile fabrics air permeability", a YG461E-III full-automatic air permeability measuring instrument is adopted, the test aperture is selected to be phi 3, the test pressure difference is 100Pa, and the test area is 20cm 2 Each sample was tested 10 times and averaged.
Referring to the washing standard in GB/T3921-2008 "fastness to soaping for textile color fastness test", a soaping experiment is carried out by taking cotton fiber fabric as lining fabric, after washing once, the fabric is dried, and the moisture absorption quick drying and air permeability performance test is carried out according to the same method. The test results are shown in Table 3.
Table 3: results of wash-resistant, hygroscopic, quick-drying and air permeability test
As can be seen from Table 3, the moisture absorption, quick drying and air permeability of example 1 before and after washing are the best, and the moisture absorption, quick drying and air permeability after washing are less changed, probably because, on one hand, there is some shrinkage of the fabric, the density is increased, the pores are smaller, and the moisture absorption and air permeability are smaller due to fine adjustment between the fibers after washing; on the other hand, because aldehyde groups on cotton fibers react with 4-aminobenzoic acid under an acidic condition to form amide bonds, a graft polymer is generated, the roughness of the cotton fibers is increased, the cohesion of the fibers in the spun fabric is enhanced, and the pores among the fibers are increased; cobalt ions are then generated in situ on hydroxyl and carboxyl groups of the graft polymer of the cotton fibers and deposited on the modified cotton fibers by a one-step reaction. The presence of carboxyl groups on 4-aminobenzoic acid provides an important site for nucleation and growth of cobalt ions. In addition, the free aldehydes in 4-aminobenzoic acid are not converted into hydroxyl groups, they can act as nucleation sites for cobalt ions to form and attach on the pretreated cotton fibers, and thus, after washing treatment, the functional components depend onBut has stronger adhesion performance. In addition, carboxylate salts of 4-aminobenzoic acid can form metal ion particles as monodentate ligands, while the graft polymer consists of O, C and N, cobalt ions being easily deposited on cotton fibers by ultrasonic treatment. When an ethanolamine molecule is introduced into CoCl 2 In the matrix, the obtained structure has high symmetry, and cobalt coordinates with hydroxyl O atoms and amino N atoms of ethanolamine. A highly amorphous structure is formed. The binding energy value of nitrogen or oxygen increases due to the electron pair effect of the nitrogen or oxygen atom and the central cobalt ion. The resulting highly amorphous structure of the frame is composed of a compact array of tiny cells, mainly around 10 microns in diameter, resembling the cross section of a pineapple. Each microcell consists of uniformly distributed layered channels ranging in width from a few hundred nanometers to a few micrometers. These channels may act as transport channels for water molecules. In addition, the surface of the channel contains some mesopores, which is favorable for enlarging the surface area, the larger surface area is favorable for adsorbing water molecules, then the water molecules and the gas can be transferred to the outer layer of the fabric through the mesopore diffusion, and the moisture absorption performance of the fabric is improved.
Test example 4
Anti-ultraviolet performance test
Referring to GB/T18830-2009 evaluation of ultraviolet resistance of textiles, a UV-1000F fabric ultraviolet resistance tester is adopted for testing. The ultraviolet protection factor (UPF value) is adopted as a main evaluation index of the ultraviolet resistance of the fabric. Each group of samples was tested three times and averaged, and the test 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 example 1 has the best anti-UV effect, probably because the reaction of 4-aminobenzoic acid with sodium periodate treated cotton fiber forms an aromatic benzene ring with both amine and carboxylic acid functionality that enhances the UV protection properties of the fabric. Due to the synergistic effect of the 4-aminobenzoic acid and cobalt ions on the modified cotton fiber, the conjugation reaction can improve the ultraviolet absorption performance, has good ultraviolet absorption performance in an ultraviolet (290-320 nm) wave band for the fabric prepared from the modified fiber, has the characteristic of no toxicity, and can be contacted with human skin.
Test example 5
Itching feel test:
according to the test method in the No. 37 and No. 12 (evaluation method of the itching feel of underwear fabric, author: zhang Xujing, university of Suzhou, 2016) of the journal of textile science, the itching feel test was carried out on the skin-friendly underwear without itching feel prepared in example 1 and example 5, and the itching feel evaluation scale is as follows:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| very no itching | No itching | Relatively free of itching | In general | Comparison of itching | Itching relieving | Very itching |
The test results are shown in table 5:
table 5: skin-friendly underwear itching feeling test result table without itching feeling
| Itching feeling score | |
| Example 1 | 2.8 |
| Example 5 | 1.6 |
From the experimental data in table 5, it is known that the itching score of the skin-friendly underwear without itching prepared from the modified cotton fiber treated by the acidic cellulase, the sodium hydroxide aqueous solution and the urea aqueous solution has the minimum value, and the smaller the itching score value, the better the touch comfort of the underwear is indicated, probably because the higher the cellulose content in the cotton fiber, the more effective the softness of the cotton fiber surface or the removal of the surface hairiness of the cotton fiber can be achieved by degrading the cellulose in the cotton fiber by the acidic cellulase, the gaps in the fiber are increased by the etching action of the enzyme, the rigidity of the cotton fiber is reduced, and the cotton thread is finished in a mercerizing-like manner by the sodium hydroxide aqueous solution and the urea aqueous solution, so that the quantity of the hairiness on the cotton fiber surface is reduced, and the anti-itching effect of the cotton fiber is further improved.
Claims (8)
1. The preparation method of the skin-friendly underwear without itching feeling is characterized by comprising the following steps of:
step 1, uniformly mixing 70-90 parts of modified fibers, and carding, drawing and roving; then blending with 10-30 parts of polyurethane fiber, winding and twisting to prepare elastic yarn;
step 2, seamless integrated knitting is carried out on the elastic yarns prepared in the step 1 by adopting a weft knitting structure, so that an integrated seamless fabric is prepared, and the integrated seamless fabric is sewn to prepare the skin-friendly underwear without itching feeling;
the preparation method of the modified fiber comprises the following steps:
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 of 50-70 ℃ and pH of 5-6, carrying out enzymolysis for 1-2 hours, taking out the cotton fibers after enzymolysis is finished, washing 1-3 times with water, and airing at 20-30 ℃; then soaking cotton fibers in a mixed solution of an NaOH aqueous solution and a 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, 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 cotton fibers with a detergent at 30-60 ℃ for 10-30 min; washing cotton fiber 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 light-shielding condition, and adjusting the pH of the solution to 7-9 by adopting 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 cotton fiber with water for 1-3 times, and airing at 20-30 ℃ to prepare 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 1-5wt% of acetic acid aqueous solution to prepare an acidic solution; adding 20-40 parts of the pretreated fibers 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, regulating the pH value of the solution to 9.5-10.5 by adopting an alkaline regulator to prepare a cobalt chloride mixed solution, soaking 20-40 parts of the pretreated fibers prepared in the step S2 in the cobalt chloride mixed solution, and carrying out ultrasonic treatment at 40-70 ℃; washing with water for 1-3 times, and then drying at 40-70 ℃ to prepare modified fibers; the parts are weight parts.
2. The method for producing skin-friendly underwear without itching according to claim 1, wherein the carding process in the step 1 is one of carding and combing.
3. The method for producing skin-friendly underwear without itching sensation according to claim 1, wherein the weft knitting structure in the step 2 is one of weft plain stitch, rib stitch, double-back stitch, variable rib stitch, single-sided jacquard stitch, double-sided jacquard stitch, single-sided tuck stitch and double-sided tuck stitch.
4. The method for producing a skin-friendly undergarment without itching according to claim 1 wherein the skin-friendly undergarment without itching in step 2 comprises a coat and a lower coat.
5. The method for preparing the skin-friendly underwear without itching sensation according to claim 1, wherein the gram weight of the skin-friendly underwear without itching sensation in the step 2 is 200-600 g/m 2 。
6. The method for preparing a skin-friendly underwear without itching feeling according to claim 1, wherein the detergent in the step S1 is one of 60-80 wt% of ethanol water solution and 70-85 wt% of methanol water solution.
7. The method for producing a skin-friendly undergarment without itching according to claim 1, wherein the alkaline regulator in steps S1 and S3 is independently one of 0.1 to 0.5 calcium hydroxide aqueous solution, 1 to 5wt% disodium hydrogen phosphate aqueous solution, 3 to 8wt% sodium bicarbonate aqueous solution, 2 to 8wt% calcium acetate aqueous solution and 0.1 to 3wt% sodium hydroxide aqueous solution.
8. A skin-friendly undergarment without itching, which is characterized in that: the method according to any one of claims 1 to 7.
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Effective date of registration: 20231218 Address after: Floors 2-5, No. 8 Baoshang Road, Nianshanli Street, Yiwu City, Jinhua City, Zhejiang Province, 322000 (self declared) Applicant after: Zhejiang Saidie Knitting Co.,Ltd. Address before: 510240 room 1013, No. 5, Fuchang Road, Haizhu District, Guangzhou City, Guangdong Province Applicant before: Guangzhou V-Love Apparel Co.,Ltd. |
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