Method for preparing skin-friendly anti-wrinkle fabric

Abstract

The invention provides a method for preparing a skin-friendly anti-wrinkle fabric, which comprises the following steps: selecting natural wood cellulose with the polymerization degree of 800-1000 as a raw material, mixing the natural wood cellulose with ionic liquid according to the mass ratio of 9: 1, dissolving at the temperature of 85 DEG C + / -5 DEG C, and carrying out multi-stage filtration and vacuum defoaming treatment to obtain a pure spinning solution; in the spinning process, the spinning temperature is controlled to be 90-100 DEG C, the volume ratio of the coagulating bath DMSO to water is 6: 4, and nascent fibers are subjected to multi-stage stretching and low-temperature slow drying; and carrying out surface biological enzyme treatment and graft polymer treatment on the spun lyocell fibers, and then carrying out plasma treatment. The fabric prepared by the method disclosed by the invention has good skin-friendly property and wrinkle resistance.

Description

Technical Field

[0001] The invention relates to a weaving method, in particular to a method for preparing skin-friendly and wrinkle-resistant fabrics. Background Art

[0002] Lyocell fiber is a new type of regenerated cellulose fiber, made from renewable natural materials such as bamboo and wood through advanced spinning technology. This fiber not only inherits the advantages of natural fibers such as comfort, good hand feel, and easy dyeing, but also has environmental protection characteristics that traditional viscose fibers do not have. The production process of Lyocell fiber does not involve chemical reactions, the solvents used are non-toxic, and the waste is biodegradable, which conforms to modern environmental protection concepts. In addition, Lyocell fiber also has good hygroscopicity, air permeability, moisture conductivity and excellent wrinkle resistance, which makes it have a wide range of application prospects in the textile field.

[0003] Lyocell fiber has low cohesion and serious static electricity problems, resulting in poor spinnability. In the spinning process, combing becomes a major difficulty. Insufficient combing will lead to an increase in cotton neps, while excessive combing will cause problems such as more short fibers and uneven yarns, affecting the quality of the yarn and subsequent processing.

[0004] Although Lyocell fiber has high strength, in the actual production process, attention should still be paid to its strength index to ensure the dimensional stability and service life of the textile. Insufficient strength may cause the fabric to deform or break during wearing or use.

[0005] Processing performance is also a key consideration. Lyocell fibers need to be well combined with other fibers (such as cotton fibers) during the blending process to form a uniform and stable yarn structure. This requires the fiber to have good spinnability and compatibility.

[0006] Lyocell fiber has high requirements for environmental temperature and humidity during the spinning process. Unstable temperature and humidity will affect the fiber opening, carding and drawing processes, and thus affect the quality and performance of the yarn. Therefore, it is necessary to strictly control the temperature and humidity conditions in the workshop and take necessary auxiliary humidification measures.

[0007] Lyocell fibers are prone to fibrillation, which will affect the appearance and performance of the fabric to a certain extent. Fibrillation may cause fuzzing and pilling on the surface of the fabric, reducing its appearance and durability. Therefore, measures need to be taken to reduce the occurrence of fibrillation during the blending process, such as optimizing the spinning process and selecting the appropriate blending ratio.

[0008] In conclusion, there are still some problems in the blending of lyocell fiber and cotton fiber. Summary of the invention

[0009] In view of the deficiencies of the prior art, the present invention provides a method for preparing a skin-friendly and anti-wrinkle fabric. To achieve the above purpose, the present invention adopts the following scheme:

[0010] A method for preparing skin-friendly and wrinkle-resistant fabrics comprises the following steps: selecting natural forest cellulose with a degree of polymerization of 800-1000 as a raw material, mixing it with an ionic liquid at a mass ratio of 9:1, dissolving it at a temperature of 85°C±5°C, and obtaining a pure spinning solution through multi-stage filtration and vacuum degassing treatment; during the spinning process, controlling the spinning temperature to be 90-100°C, the volume ratio of DMSO to water in a coagulation bath to be 6:4, and subjecting the nascent fibers to multi-stage stretching and slow low-temperature drying; subjecting the spun lyocell fibers to surface bio-enzyme treatment and grafted polymer treatment, followed by plasma treatment.

[0011] Furthermore, the surface biological enzyme treatment uses cellulase, the treatment time is 30-60 minutes, the temperature is controlled at 30-50° C., the enzyme dosage is 0.1%-1% of the fiber weight, and the pH value is 4.5-6.5.

[0012] Furthermore, the grafted polymer treatment uses a polymer that can chemically react with the cellulose surface, such as polyvinyl alcohol or polyethylene glycol, the treatment time is 1-2 hours, the temperature is controlled at 40-60°C, the polymer concentration is 1%-5% of the fiber weight, and the plasma treatment uses a plasma device with a power of 80-300 watts, and the treatment time is 10-15 minutes.

[0013] Furthermore, the method further comprises the step of interweaving the treated lyocell fibers with high-quality long-staple cotton fibers, wherein the lyocell fibers account for 60%-80%, and the spinning process adopts ring spinning or compact spinning technology.

[0014] Furthermore, the cotton fibers undergo conventional pre-treatment steps such as cotton cleaning and carding, as well as singeing and desizing treatments on the fabric.

[0015] Furthermore, the lyocell fiber and the cotton fiber are blended in a mass ratio of 60%-80% and 20%-40%, and the total amount of the two fibers is 100%.

[0016] Furthermore, the friction coefficient with the skin is lower than 0.3, the air permeability is greater than 500 mm / s, and the moisture absorption rate is greater than 5%.

[0017] Furthermore, after folding and unfolding five times, the fold recovery angle remains above 150 degrees.

[0018] Furthermore, after 5 standard washes, the fabric remains smooth in appearance with no noticeable wrinkles.

[0019] Furthermore, natural forest cellulose with a degree of polymerization of 800-1000 is selected, ionic liquid is used as a solvent, the dissolution temperature and dissolution time are controlled, and the purity and bubble-free of the spinning solution are ensured by multi-stage filtration and vacuum degassing, and then spinning and post-treatment are carried out to obtain Lyocell fiber with good softness and hand feel; high-quality long-staple cotton is selected, and after pre-treatment processes such as cotton cleaning and carding, it is spun and twisted with Lyocell fiber in a blending ratio of 70:30, and ring spinning technology is used to control the roving quantity, spun yarn number and twist coefficient; finally, it is woven by an air jet loom or a rapier loom, and a post-finishing process is carried out, including desizing, pre-setting treatment, softening treatment and anti-wrinkle finishing, so as to obtain a skin-friendly and anti-wrinkle fabric with a friction coefficient between the fabric and the skin lower than 0.3, an air permeability greater than 500mm / s, and a moisture absorption rate greater than 5%;

[0020] The post-treatment steps of Lyocell fiber include surface enzyme treatment and grafted polymer treatment. Specific enzymes that can act on the surface of cellulose, such as cellulase, are selected to improve the softness and feel of the fiber; polymers that can chemically react with the surface of cellulose, such as polyvinyl alcohol (PVA) or polyethylene glycol (PEG), are selected to ensure that the polymer penetrates evenly into the fiber; followed by plasma treatment;

[0021] The pre-treatment process of cotton fiber includes cotton cleaning and carding. The cotton cleaning machine is used to remove impurities in the raw materials to improve the purity of the fibers. The carding machine is used to decompose the cotton bundles into single fibers to further remove short fibers, impurities and defects, and make the fibers parallel and straight. The cylinder speed, doffer speed, licker-in speed and feed roller speed are controlled.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. Excellent skin-friendliness. The friction coefficient between the fabric and the skin is significantly reduced (less than 0.3), reducing discomfort when wearing. 2. Excellent moisture absorption and breathability, with a breathability of more than 500mm / s, which helps air circulation; 3. Excellent wrinkle resistance: It retains the natural comfort of cotton fiber and combines the wrinkle resistance of lyocell fiber. DETAILED DESCRIPTION

[0024] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention are further described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] In the textile industry, the selection and pretreatment of raw materials are key steps in the entire production process, which directly affects the quality and effect of subsequent spinning, weaving and finishing processes. For the lyocell fiber and cotton fiber used in the present invention, in addition to clarifying their specifications and characteristics, the further selection and pretreatment process is as follows.

[0026] Selection and pretreatment of lyocell fibers:

[0027] As a new type of environmentally friendly fiber, although the production process of Lyocell fiber is environmentally friendly, strict raw material screening and pretreatment are still required in actual use to ensure the consistency of fiber quality and the smooth progress of subsequent processing. In the raw material selection stage, it should be ensured that the Lyocell fiber comes from a reliable supplier, the fiber quality meets international and industry standards, and there are no impurities, oil stains and other defects. In addition, since the surface of Lyocell fiber is smooth and the static electricity phenomenon is more serious, special attention should be paid to antistatic treatment during the pretreatment process. In addition to using an appropriate amount of antistatic agent to spray the fiber surface, plasma treatment or nanomaterial modification technology can also be introduced to further enhance the antistatic performance of the fiber and reduce entanglement during the production process.

[0028] During the pretreatment process, the lyocell fibers need to be fully opened, mixed and cleaned to ensure the uniformity and cleanliness of the fibers. During the opening process, excessive fiber damage should be avoided to maintain the length and strength of the fibers; the mixing process needs to ensure the uniform mixing of fibers from different batches to prevent color differences and performance differences; the cleaning process needs to thoroughly remove impurities in the fibers to avoid affecting the subsequent spinning and weaving quality.

[0029] Selection and pretreatment of cotton fibers:

[0030] Cotton fiber is as traditional textile raw material, and its selection and pretreatment process are relatively mature. However, in the present invention, since cotton fiber will be interwoven with lyocell fiber, the quality requirements of cotton fiber are also more stringent. In the raw material selection stage, high-quality cotton fiber with good maturity, long fiber length and high strength should be preferably selected to ensure the overall performance of interwoven fabrics. In the pretreatment process, cotton fiber needs to go through multiple processes such as cotton cleaning, combing, combing, etc. to remove unfavorable factors such as impurities and short fluff, so as to improve the parallelism and straightness of fiber.

[0031] In addition, since cotton fibers are prone to moisture absorption and re-moisture, the temperature and humidity conditions in the workshop must be strictly controlled during the pretreatment process to prevent the cotton fibers from excessively absorbing or releasing moisture, which would affect the stability of the subsequent spinning and weaving processes. In the cotton cleaning process, impurities and short fibers in the cotton fibers can be effectively removed through reasonable beater configuration and beater speed adjustment; the carding process requires optimization of the card clothing configuration and combing process parameters to improve the quality of the raw sliver; the combing process further removes short fibers and cotton knots in the raw sliver to improve the parallelism of the fibers and the uniformity of the sliver.

[0032] Spinning process optimization and equipment selection

[0033] The spinning process is the key link in processing fibers into yarns, and the reasonable setting of process parameters and the scientific selection of equipment are crucial to improving the quality of yarns. In the present invention, the spinning process needs to be optimized in a targeted manner according to the different characteristics of lyocell fibers and cotton fibers, and suitable equipment is selected for production.

[0034] Lyocell fiber spinning process optimization:

[0035] During the spinning process of Lyocell fiber, the traditional spinning process needs to be adjusted accordingly because the fiber surface is smooth and the static electricity phenomenon is serious. In the cotton cleaning process, the fiber entanglement and damage can be reduced by reducing the beater speed and using combing needle beaters; the carding process needs to optimize the configuration of the card clothing and the combing process parameters to improve the separation and parallelism of the fibers; the drawing process needs to ensure the stable movement of the fibers during the drafting process by controlling the relative humidity and the amount of pressure; the roving and spinning processes need to improve the strength and uniformity of the yarn by optimizing the process parameters such as twist, roller spacing and pressure.

[0036] In terms of equipment selection, in view of the characteristics of Lyocell fibers, spinning equipment with antistatic functions can be selected, such as static elimination devices and antistatic rollers. At the same time, since the breaking strength and elongation of Lyocell fibers are both high, equipment that can withstand high drafting force and twist is required for production. In addition, in order to improve spinning efficiency and quality stability, intelligent spinning equipment and automatic control systems can also be introduced to achieve precise control and remote monitoring of the spinning process.

[0037] Cotton fiber spinning process and equipment selection:

[0038] Compared with lyocell fiber, the spinning process of cotton fiber is relatively mature and stable. However, in the present invention, since cotton fiber will be interwoven with lyocell fiber, the spinning process also needs to be appropriately optimized. In the cleaning, carding and combing processes, the process parameters and equipment configuration need to be adjusted according to the characteristics of cotton fiber to improve the quality of raw sliver and fiber parallelism; the drawing process needs to ensure the uniform mixing and stable drafting of cotton fiber and lyocell fiber; the roving and spinning processes need to improve the strength and uniformity of cotton yarn by optimizing process parameters such as twist, roller spacing and pressure.

[0039] In terms of equipment selection, spinning equipment with automation and intelligent functions can be used for cotton fiber spinning production. These equipment can not only improve spinning efficiency and stability, but also monitor and optimize the spinning process in real time through data analysis and remote monitoring. At the same time, in order to ensure the interweaving effect and quality consistency of cotton yarn and lyocell fiber yarn, it is also necessary to select equipment that can accurately control yarn tension and twist for production.

[0040] Weaving and finishing processes.

[0041] Weaving and finishing process is the final link of processing yarn into fabric, and is also the key factor that determines the final quality and appearance of fabric. In the present invention, according to the characteristic requirements of lyocell fiber and cotton fiber interwoven fabric, weaving and finishing process need to be deepened and optimized.

[0042] Weaving process:

[0043] In the weaving process, it is necessary to select a suitable loom for production according to the twill structure and interweaving characteristics of the fabric. Air jet looms and rapier looms are two commonly used weaving equipment, each with its own characteristics and strong adaptability. Air jet looms are known for their high speed and high efficiency, and are suitable for producing high-density and complex interweaving fabrics; while rapier looms have the characteristics of good flexibility and strong adaptability, and are suitable for producing fabrics with various complex structures. In the present invention, a suitable loom can be selected for production according to the actual needs of the fabric and the performance characteristics of the equipment.

[0044] During the weaving process, key parameters such as the tension of the warp and weft yarns, interweaving density, and fabric quality need to be strictly controlled. The tension of the warp and weft yarns should be consistent and stable to ensure the stability of the fabric structure and the uniformity of the appearance; the interweaving density needs to be adjusted according to the thickness and style requirements of the fabric; the fabric quality needs to be maintained and improved through regular inspections and cleaning of equipment. In addition, in order to improve weaving efficiency and fabric quality stability, intelligent weaving systems and remote monitoring systems can also be introduced to monitor and optimize the weaving process in real time.

[0045] Finishing process:

[0046] The finishing process is an important link to improve the wearing performance and appearance quality of fabrics. In the present invention, the finishing process needs to be deepened and optimized according to the characteristic requirements of the interwoven fabrics of lyocell fiber and cotton fiber. The steps of desizing, scouring, bleaching, mercerizing, softening and shaping are the key links in the finishing process. Each step needs to strictly control the process parameters and treatment effects to ensure the stability and consistency of the fabric quality.

[0047] In the desizing process, it is necessary to select appropriate desizing agents and process conditions to remove the sizing residue to improve the softness and breathability of the fabric; the scouring process needs to further remove impurities to improve the whiteness and water absorption of the fabric; the bleaching process needs to control the concentration of the bleaching agent and the processing time to make the color of the fabric more uniform and white; mercerization can enhance the gloss and smoothness of the fabric and improve the grade of the fabric; in the softening process, it is necessary to select a finishing agent with skin care function and control the concentration and temperature of the treatment liquid to ensure that the skin care ingredients are evenly penetrated into the fabric fiber to enhance the skin care effect; finally, the fabric size is stabilized by high temperature setting to improve the wrinkle resistance and ensure the dimensional stability of the fabric. In addition, in the post-finishing process, attention should be paid to the application of environmental protection requirements and energy-saving and emission reduction measures to reduce the impact on the environment and reduce production costs.

[0048] Example 1

[0049] 1. Lyocell fiber production.

[0050] Natural forest cellulose with a degree of polymerization of 800-1000 is selected. The solvent is an ionic liquid (such as [Bmim]Cl) and cellulose in a ratio of about 9:1 (mass ratio).

[0051] Before spinning: dissolving temperature is 85℃±5℃, keep the temperature stable to ensure uniform dissolution; dissolution time is about 4-6 hours. Multi-stage filtration is adopted, and the final filtration accuracy reaches below 5 microns to ensure the purity of spinning solution. When the vacuum degree reaches -0.1MPa and the degassing time is more than 30 minutes, ensure that there are no bubbles in the spinning solution for vacuum degassing.

[0052] Spinning process. The spinning temperature is controlled at 90-100℃ to ensure smooth spinning. The diameter of the spinneret micropores is about 0.05-0.1mm, the ratio of DMSO to water in the coagulation bath is about 6:4 (volume ratio), the temperature is controlled at 20-30℃, the primary fiber is stretched in multiple stages, and the total stretching multiple is about 4-6 times; low temperature and slow drying, the temperature is controlled at 60-80℃.

[0053] Post-treatment. Surface enzyme treatment and grafted polymer treatment. For surface enzyme treatment, select specific enzymes that can act on the surface of cellulose, such as cellulase. This enzyme can gently degrade the microstructure of the cellulose surface, thereby improving the softness and feel of the fiber. The treatment time is 30-60 minutes; the temperature is controlled at 30-50°C; the enzyme dosage is 0.1%-1% of the fiber weight. The pH value is 4.5-6.5. The treatment process includes immersing the fiber in a solution containing enzymes, maintaining a constant temperature and pH value, and stirring to ensure uniform treatment. After the treatment is completed, the fiber is washed with clean water to remove residual enzymes.

[0054] Grafted polymer treatment. A polymer that reacts chemically with the cellulose surface, such as polyvinyl alcohol (PVA) or polyethylene glycol (PEG), is selected for 1-2 hours at a temperature of 40-60°C; the polymer concentration is typically 1%-5% of the fiber weight. The treatment involves immersing the fiber in a solution containing the grafted polymer and a catalyst. The temperature is maintained constant and agitation is applied to ensure uniform penetration of the polymer into the fiber. After the treatment is complete, the fiber is washed with clean water to remove any residual polymer and catalyst. The fiber is dried to remove any excess water.

[0055] This is followed by plasma treatment with a power of 80-300 watts and a treatment time of 10-15 minutes.

[0056] 2. Production of Lyocell Fiber and Cotton Fiber Interwoven Fabrics

[0057] Lyocell fiber is produced by the above method to ensure that it has good softness and feel.

[0058] Cotton fiber: Choose high-quality long-staple cotton with a length of not less than 33mm and a micronaire value between 3.7-4.2.

[0059] Cotton fibers need to go through the following pre-treatment processes: cotton cleaning, using a cotton cleaning machine to remove impurities in the raw materials, such as seed crumbs, sterile seeds, and short fibers, to improve the purity of the fibers; using a carding machine to decompose the cotton bundles into single fibers, further remove short fibers, impurities and defects, and make the fibers parallel and straight, and finally make cotton strips for use in the drawing machine. The main process parameters of the carding machine are set as follows: cylinder speed: about 350 rpm; doffer speed: about 22 rpm; licker-in speed: about 800 rpm; cotton feeding roller speed: adjusted according to the quantitative amount of cotton strips, generally controlled at 10-20 m / min;

[0060] Spinning and twisting. Blending ratio: the blending ratio of lyocell fiber to cotton fiber is 70:30 to further balance the skin-friendliness and wrinkle resistance of the fabric.

[0061] The spinning process adopts ring spinning technology; the roving quantity is controlled at 4.0-4.5g / 10m, the spun yarn number is selected as 20s or 30s; the twist coefficient is between 340-360.

[0062] Weaving and finishing:

[0063] Weaving, using air jet loom or rapier loom, weaving speed controlled at 400-600 rpm. Then the gas singeing machine is used to remove the fluff on the cloth surface to improve the smoothness of the fabric. The flame temperature is controlled at 800-1000℃, and the speed is adjusted according to the thickness and composition of the fabric. Then desizing enzyme or alkali solution is used for desizing treatment to remove the residual sizing in the yarn while maintaining the strength of the fiber. The desizing temperature is generally controlled at 60-80℃, and the time is determined according to the type and amount of sizing.

[0064] Pre-setting treatment: pre-setting treatment is carried out through a pre-shrinking machine, and the pre-setting temperature is generally set at 160-180℃; use environmentally friendly softener to soften the fabric.

[0065] Anti-wrinkle finishing: use environmentally friendly resins or cross-linking agents for anti-wrinkle finishing.

[0066] The fabric fabrics manufactured by the method of the present invention have the following test parameters:

[0067] The friction coefficient between the fabric and the skin is less than 0.3; the allergic reaction test after skin contact has passed the ISO 10993-5 skin-friendly test, with no irritation or allergic reaction; the air permeability is greater than 500mm / s, and the moisture absorption rate is greater than 5%. It has good skin affinity.

[0068] After being folded and unfolded five times, the wrinkle recovery angle of the fabric remains above 150 degrees; after being washed five times in a standard manner, the appearance of the fabric remains flat without obvious wrinkles.

[0069] Comparative Example 1:

[0070] Lyocell fiber production section:

[0071] Dissolution conditions were changed: the dissolution temperature was adjusted to 75°C (lower than 85°C±5°C required by the present invention), and the dissolution time was shortened to 2 hours.

[0072] Changes in spinning process: The spinning temperature was adjusted to 80°C (lower than the 90-100°C required by the present invention), the coagulation bath temperature was adjusted to 15°C (lower than the 20-30°C required by the present invention), and the total stretching multiple was reduced to 3 times.

[0073] Interwoven fabric production remains unchanged.

[0074] Test results:

[0075] Skin-friendliness: The friction coefficient between the fabric and the skin is 0.48.

[0076] Wrinkle resistance: After the fabric is folded and unfolded 5 times, the wrinkle recovery angle is 120 degrees.

[0077] Comparative Example 2:

[0078] Lyocell fiber production section:

[0079] Omit post-treatment steps: completely omit surface enzyme treatment and grafted polymer treatment, and do not perform plasma treatment.

[0080] Interwoven fabric production remains unchanged.

[0081] Test results:

[0082] Skin-friendliness: Although the fabric maintains basic softness, its air permeability and moisture absorption rate are reduced to 240mm / s and 1% respectively.

[0083] Wrinkle resistance: After 5 standard washes, the fabric has slight wrinkles on the surface and poor wrinkle resistance.

[0084] Comparative Example 3:

[0085] Lyocell fiber production remained unchanged.

[0086] Some changes in interwoven fabric production:

[0087] Change in blending ratio: The blending ratio of lyocell fiber and cotton fiber is adjusted to 50:50, instead of 70:30 in the embodiment.

[0088] Test results:

[0089] Skin-friendliness: The softness of the fabric decreased, and the friction coefficient increased to 0.46, which was slightly worse than that of the example.

[0090] Wrinkle resistance: After the fabric is folded and unfolded five times, the wrinkle recovery angle is 110 degrees, which is lower than more than 150 degrees in the embodiment.

[0091] Comparative Example 4:

[0092] Lyocell fiber production remained unchanged.

[0093] Some changes in interwoven fabric production:

[0094] Simplified pre-treatment: Omit the use of carding machine and proceed directly to drawing process.

[0095] The spinning process is simplified: the roving weight is increased to 5.0 g / 10 m, and the twist coefficient is adjusted to 320, which is lower than the requirement of the embodiment.

[0096] Test results:

[0097] Skin-friendliness: Due to insufficient processing of cotton fibers, the friction coefficient between the fabric and the skin increases to 0.43, and the surface of the fabric is not smooth enough.

[0098] Wrinkle resistance: After 5 standard washes, the smoothness of the fabric is significantly reduced, more wrinkles appear, and the wrinkle resistance is significantly weakened.

[0099] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a skin-friendly and wrinkle-resistant fabric, characterized in that: The following steps are involved: Natural forest cellulose with a degree of polymerization of 800-1000 is selected as raw material, mixed with ionic liquid in a mass ratio of 9:1, dissolved at a temperature of 85℃±5℃, and subjected to multi-stage filtration and vacuum degassing treatment to obtain a pure spinning solution; during the spinning process, the spinning temperature is controlled to be 90-100℃, the volume ratio of coagulation bath DMSO to water is 6:4, and the nascent fiber is subjected to multi-stage stretching and slow low-temperature drying; the spun Lyocell fiber is subjected to surface enzyme treatment and grafted polymer treatment, and then plasma treatment.

2. The method for preparing skin-friendly and wrinkle-resistant fabric according to claim 1, wherein the surface biological enzyme treatment uses cellulase, the treatment time is 30-60 minutes, the temperature is controlled at 30-50°C, the enzyme dosage is 0.1%-1% of the fiber weight, and the pH value is 4.5-6.

5.

3. The method for preparing skin-friendly and wrinkle-resistant fabrics according to claim 1, wherein the grafted polymer treatment uses a polymer that can chemically react with the cellulose surface, such as polyvinyl alcohol or polyethylene glycol, the treatment time is 1-2 hours, the temperature is controlled at 40-60°C, the polymer concentration is 1%-5% of the fiber weight, and the plasma treatment uses a plasma device with a power of 80-300 watts, and the treatment time is 10-15 minutes.

4. The method for preparing skin-friendly and wrinkle-resistant fabric according to claim 1, further comprising the step of interweaving the treated lyocell fiber with high-quality long-staple cotton fiber, wherein the lyocell fiber accounts for 60%-80%, the spinning process adopts ring spinning or compact spinning technology.

5. The method for preparing skin-friendly and wrinkle-resistant fabric according to claim 4, wherein the cotton fiber undergoes conventional pre-treatment steps such as cotton cleaning and carding, and includes singeing and desizing treatment of the fabric.

6. The method for preparing skin-friendly and wrinkle-resistant fabric according to claim 5, wherein the lyocell fiber and cotton fiber according to claims 1-5 are blended in a mass ratio of 60%-80% and 20%-40%, and the total amount of the two fibers is 100%.

7. The method for preparing a skin-friendly and anti-wrinkle fabric according to any one of claims 1 to 6, characterized in that: The friction coefficient with the skin is lower than 0.3, the air permeability is greater than 500mm / s, and the moisture absorption rate is greater than 5%.

8. The method for preparing a skin-friendly and anti-wrinkle fabric according to any one of claims 1 to 6, characterized in that: After folding and unfolding five times, the fold recovery angle remained above 150 degrees.

9. The method for preparing a skin-friendly and anti-wrinkle fabric according to any one of claims 1 to 6, characterized in that: After 5 standard washes, the fabric remains smooth and has no obvious wrinkles.

10. The method for preparing a skin-friendly and anti-wrinkle fabric according to any one of claims 1 to 9, characterized in that: Select natural forest cellulose with a degree of polymerization of 800-1000, use ionic liquid as solvent, control the dissolution temperature and dissolution time, ensure the purity and bubble-free of spinning solution through multi-stage filtration and vacuum degassing, and then spin and post-treat to obtain Lyocell fiber with good softness and hand feel; select high-quality long-staple cotton, go through pre-treatment processes such as cotton cleaning and carding, and then spin and twist with Lyocell fiber at a blending ratio of 70:30, use ring spinning technology to control the roving quantity, spun yarn number and twist coefficient; finally, weave through air-jet loom or rapier loom, and carry out post-finishing process, including desizing, pre-setting treatment, softening treatment and anti-wrinkle finishing, so as to obtain skin-friendly and anti-wrinkle fabric with a friction coefficient between fabric and skin lower than 0.3, air permeability greater than 500mm / s, and moisture absorption rate greater than 5%; The post-treatment steps of Lyocell fiber include surface enzyme treatment and grafted polymer treatment. Specific enzymes that can act on the surface of cellulose, such as cellulase, are selected to improve the softness and feel of the fiber; polymers that can chemically react with the surface of cellulose, such as polyvinyl alcohol (PVA) or polyethylene glycol (PEG), are selected to ensure that the polymer penetrates evenly into the fiber. This is followed by plasma treatment; The pre-treatment process of cotton fiber includes cotton cleaning and carding. The cotton cleaning machine is used to remove impurities in the raw materials to improve the purity of the fibers. The carding machine is used to decompose the cotton bundles into single fibers to further remove short fibers, impurities and defects, and make the fibers parallel and straight. The cylinder speed, doffer speed, licker-in speed and feed roller speed are controlled.