WO2021164408A1

WO2021164408A1 - Formaldehyde-free and strength loss-free crease-resistant finishing method for cotton fabrics

Info

Publication number: WO2021164408A1
Application number: PCT/CN2020/137849
Authority: WO
Inventors: 王强; 黄聪; 余圆圆; 王平; 周曼
Original assignee: 江南大学
Priority date: 2020-02-21
Filing date: 2020-12-21
Publication date: 2021-08-26
Also published as: CN111172752A; CN111172752B

Abstract

The present invention relates to the field of crease-resistant finishing of textiles. Disclosed is a formaldehyde-free and strength loss-free crease-resistant finishing method for cotton fabrics. A lipoic acid analogue containing both a disulfide bond (or sulfydryl) and carboxyl is used as a crease-resistant finishing agent for cotton fabrics in the present invention, and a formaldehyde-free and strength loss-free crease-resistant finishing method for cotton fabrics is established. The method comprises: firstly dipping scoured and bleached cotton fabrics in a dimethyl sulfoxide solution of the lipoic acid analogue, and completing an esterification reaction under the action of a dehydrating agent and a catalyst; and reducing a disulfide bond in the lipoic acid analogue into two sulfydryl groups by using a reducing agent, and finally oxidizing the sulfydryl groups into a disulfide bond under a certain tension to form a covalent cross-linked structure so as to obtain the durable crease-resistant cotton fabrics. The finished cotton fabrics are strength loss-free, excellent in crease resistance, and good in washable stability. The molecular structure of the lipoic acid analogue does not contain formaldehyde, so that the problems of formaldehyde release and the like do not exist in the processing process or using process, and the safety of the crease-resistant cotton fabrics is ensured.

Description

Anti-wrinkle finishing method for cotton fabric without formaldehyde and strength loss

Technical field

The invention relates to an anti-wrinkle finishing method for cotton fabric without formaldehyde and strength loss, and belongs to the field of textile anti-wrinkle finishing.

Background technique

Cotton fabric is favored by everyone because of its soft material, comfortable wearing, good air permeability, and excellent dyeing performance. However, natural cotton fabric has shortcomings such as easy to wrinkle and difficult to recover, easy to wet and difficult to dry, etc., which gives people in daily use. Bringing a lot of inconvenience, so cotton fabrics often have anti-wrinkle finishing during processing. The reason for the wrinkles of cotton fabric is that the cellulose is connected by hydrogen bonds instead of covalent bonds. When the cotton fabric is processed or washed, the hydrogen bonds are easily broken and new hydrogen bonds are formed in new positions, resulting in wrinkles. . Researchers have done a lot of research on anti-wrinkle finishing. In 1926, people began to treat cotton fabrics with urea-formaldehyde or phenol-formaldehyde pre-shrinks to obtain anti-wrinkle effects. However, due to the poor stability of the pre-shrinks and finishing solutions, and the treated cotton fabrics had problems such as poor hand feeling and decreased strength, so It has not been applied in large-scale production. Since the 1950s, formaldehyde derivatives such as dimethylol ethylene urea (DMDHEU) have been used in anti-wrinkle finishing. DMDHEU is also called 2D resin. 2D resin has a good anti-wrinkle effect, and has been used for a long time thereafter. It is considered the best anti-wrinkle finishing agent. However, in the follow-up research, it was found that this type of anti-wrinkle finishing agent would gradually release formaldehyde during daily consumption, which did not meet the requirements of environmental protection.

Since the 1990s, the development of low-formaldehyde or formaldehyde-free anti-wrinkle crosslinking agents to replace traditional formaldehyde crosslinking agents has become an urgent problem for the majority of scientific researchers. Etherified 2D resin is an important type of low-formaldehyde finishing agent, but the anti-wrinkle and durable pressing effect of cotton fabrics finished with etherified 2D resin is not excellent, and there is still a small amount of formaldehyde released. There are many types of formaldehyde-free anti-wrinkle crosslinking agents, such as chitosan finishing agents, acrylates, dialdehyde finishing agents, and polycarboxylic acid crosslinking agents. Among them, scientific researchers have the most extensive research on polycarboxylic acid anti-wrinkle crosslinking agents. Polycarboxylic acids were used in the anti-wrinkle finishing of cotton fabrics as early as the 1950s and 1960s, but they did not achieve good results until the 1990s. Phosphate is used as a catalyst for the esterification reaction of polycarboxylic acid and cellulose. Polycarboxylic acid has made breakthrough progress as a formaldehyde-free anti-wrinkle crosslinking agent for cotton fabrics. Among the many polycarboxylic acid finishing agents, the focus of research is mainly on butane tetracarboxylic acid (BTCA), citric acid (CA) and citric acid derivatives, maleic acid derivatives (MA) or carboxylic acid polymers . Among them, BTCA has strong activity, no irritating odor, good non-ironing performance, and outstanding finishing effect. The existing research believes that butanetetracarboxylic acid has very good anti-wrinkle performance and is the most promising anti-wrinkle crosslinking agent. However, the cost of BTCA is relatively high, and due to its strong acidity, it will cause significant damage to the strength of cotton fabrics under high temperature conditions, which limits the large-scale application of BTCA in industrial production. In recent years, the research on anti-wrinkle finishing has been a hot topic. The main problem of anti-wrinkle finishing is that the fabric strength after finishing has large damage (generally the strength loss is 40-60%), so look for the small damage to the fabric. Cross-linking agents and exploring new finishing processes are the goals that scientific researchers are now striving to pursue.

Summary of the invention

【technical problem】

Existing studies have shown that the reason for the strong damage in the traditional anti-wrinkle finishing process is that the drying and baking of cotton fabric under acidic conditions will cause fiber damage, resulting in strong damage to the fabric. In order to solve the problem that the wrinkle resistance of the fabric is good but the strength is generally severely decreased after the anti-wrinkle finishing of the existing cotton products.

【Technical solutions】

The present invention uses lipoic acid analogue as an anti-wrinkle crosslinking agent for the first time. The lipoic acid analogue molecule has a carboxyl group and a disulfide bond structure and can undergo an esterification reaction with the hydroxyl group on the cellulose. The disulfide bond can be reduced to two sulfhydryl groups under the action of a reducing agent, and the sulfhydryl group can be combined into a disulfide bond under the action of an oxidizing agent. A covalent cross-linked structure is formed on the macromolecules, so the cotton fabric is not prone to wrinkles. The invention adopts mild conditions to graft lipoic acid analogues onto cotton fabrics to complete the esterification reaction, and the cotton fabrics do not contain acidic substances during baking, which avoids damage to the cellulose macromolecular structure caused by heating under acidic conditions The strength of the fabric is lost. Since lipoic acid analogs form a covalent cross-linked structure through the recombination of disulfide bonds, the finished cotton fabric has a good anti-wrinkle effect and good washing resistance stability.

The first object of the present invention is to provide a formaldehyde-free and no-strength anti-wrinkle finishing method for cotton fabrics. The method is to first immerse the scoured and bleached cotton fabrics in a dimethyl sulfoxide solution of lipoic acid analogues. The esterification reaction is completed under the action of the dehydrating agent and the catalyst; then the reducing agent is used to reduce the disulfide bond in the lipoic acid analog to two sulfhydryl groups, and finally oxidized to a disulfide bond under a certain tension to form a covalent cross-linked structure. A durable anti-wrinkle cotton fabric is obtained; the lipoic acid analog is a type of compound having both a disulfide bond (or sulfhydryl group) and a carboxyl group.

In an embodiment of the present invention, the specific steps of the method are:

(1) First dissolve the lipoic acid analog in the dimethyl sulfoxide solution, then add N-N'-dicyclohexylcarbodiimide (DCC), add 4-dimethylaminopyridine (DMAP), and shake to activate , Then put into the cotton fabric, shake, wash with water after the completion of the reaction, ultrasonically clean in ethanol, wash with water, and dry to obtain the cotton fabric grafted with lipoic acid analogues;

(2) Put the cotton fabric grafted with lipoic acid analogues into a certain concentration of sodium borohydride solution to reduce, apply tension after washing with water, bake under certain conditions, and then maintain the tension to oxidize in the air; lipoic acid on the cotton fabric The cross-linking of the disulfide bonds is completed, and a wrinkle-resistant cotton fabric is obtained.

In one embodiment of the present invention, in the step (1), the lipoic acid analog is α-lipoic acid, cystine or cysteine, preferably α-lipoic acid.

In one embodiment of the present invention, in the step (1), the concentration of lipoic acid analog is 50～150g/L, and the concentration of N-N'-dicyclohexylcarbodiimide (DCC) is 50～ 150g/L, 4-dimethylaminopyridine (DMAP) concentration is 30～90g/L.

In one embodiment of the present invention, in the step (1), the activation time of the lipoic acid analog is 30-60 min, and the shaking temperature is 20-40°C; the activation time is preferably 30 min, and the shaking temperature is preferably 30°C .

In one embodiment of the present invention, in the step (1), the bath ratio of the cotton fabric in the lipoic acid analog solution is 1:20-50 (fabric g: solution mL), and the reaction time is 12-36h , The shaking temperature is 20-40°C; the reaction time is preferably 24h, and the shaking temperature is preferably 30°C.

In an embodiment of the present invention, in the step (1), the ultrasonic cleaning time of the grafted cotton fabric in absolute ethanol is 30-60 min; in the embodiment of the present invention, the ultrasonic cleaning time is preferably 30 min .

In an embodiment of the present invention, in the step (2), the concentration of the sodium borohydride solution is 0.1 to 1 mol/L, the bath ratio is 1:50 to 100; the reduction time is 30 to 60 minutes; the implementation of the present invention In the manner, the reduction time is preferably 30 min.

In one embodiment of the present invention, in the step (2), the curing temperature of the reduced cotton fabric is 120-180° C., and the curing time is 2-5 min.

In one embodiment of the present invention, in the step (2), the oxidation time of the baked cotton fabric in air is 6-24 hours; the oxidation time is preferably 6 hours.

The second object of the present invention is to provide a cotton fabric finished by the above method.

The third object of the present invention is to provide a garment or fabric containing the above-mentioned cotton fabric.

The fourth object of the present invention is to provide an application of lipoic acid analogues in the anti-wrinkle finishing of cotton fabrics. The lipoic acid analogues are compounds having both carboxyl and disulfide bonds, or carboxyl and sulfhydryl groups; specifically Alpha lipoic acid, cystine or cysteine.

The fifth object of the present invention is to provide an anti-wrinkle finishing solution for cotton fabrics. The finishing solution is divided into A solution and B solution, wherein the A solution is a lipoic acid analogue containing 50～150g/L, N-N'- Dicyclohexylcarbodiimide 50～150g/L and 4-dimethylaminopyridine (DMAP) 30～90g/L solution; B solution is a solution containing 0.1～1mol/L sodium borohydride; the lipoic acid is similar The product is a class of compounds with both a carboxyl group and a disulfide bond, or a carboxyl group and a mercapto group.

The sixth object of the present invention is to provide a method of using the above-mentioned anti-wrinkle finishing liquid for cotton fabrics. The cotton fabric is placed in liquid A, the bath ratio is 1:20-50, and the treatment time is 12-36h at 20-40°C; end Afterwards, rinse with water and dry; then put it in B liquid, bath ratio is 1:50-100, immerse for 0.5-1h, wash with water, bake, and oxidize in the air while maintaining tension.

The beneficial effects of the present invention:

(1) The present invention uses lipoic acid analogues as anti-wrinkle crosslinking agents for the first time. The covalent crosslinking structure of lipoic acid analogues on cotton fabrics is realized through the mutual conversion of disulfide bonds and sulfhydryl groups, so that the cotton fabrics have a good Anti-wrinkle effect and washing resistance stability; the wrinkle recovery angle is increased from 126.55° to 250.62°, and the anti-wrinkle effect is increased by 98%.

(2) Compared with the anti-wrinkle finishing process reported in the literature, the most prominent advantage of the present invention is that not only the strength is not lost, but the strength is enhanced, and the strength retention rate is as high as 105.6%.

(3) The present invention uses lipoic acid analogues as crosslinking agents, and the molecular structure of lipoic acid analogues does not contain formaldehyde structure, and there will be no formaldehyde release problems during processing or taking, thereby ensuring the safety of the fabric from the source sex.

Detailed ways

In the following, the present invention will be further described in conjunction with examples, but the scope of protection of the present invention is not limited to the scope indicated by the examples.

In the embodiment, the cotton fabric used is a plain weave woven fabric that has been scoured and bleached, with a specification of 40×40,133×72, a wrinkle recovery angle of 126.55°, and a breaking strength of 639.5N. Adopt GB/T 3819-1997 "Textile fabric crease recovery test method of recovery angle" to test the wrinkle recovery angle of anti-wrinkle cotton fabric; Adopt GB/T 3923.1-2013 "Textile fabric tensile properties Part 1 Breaking strength and fracture Determination of elongation (strip method) "Crease-resistant cotton fabric warp strength test, strength retention (%)=(breaking strength of unfinished fabric/breaking strength of finished fabric)×100%.

Example 1:

First, prepare a solution of α-lipoic acid with a concentration of 50g/L, and add 50g/L α-lipoic acid, 50g/L N-N'-dicyclohexylcarbodiimide and 30g/L to dimethyl sulfoxide. -Dimethylaminopyridine. Shake for 30 minutes at 30°C, then immerse the cotton fabric in the solution at a bath ratio of 1:50, shake for 24 hours, and set the temperature at 30°C. After the grafting is completed, it is washed with water, then placed in absolute ethanol for ultrasonic cleaning for 30 minutes, washed with water, and dried to obtain a cotton fabric grafted with α-lipoic acid.

Put the cotton fabric grafted with lipoic acid into 0.5mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction is complete, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours. The disulfide bond of lipoic acid on the cotton fabric is cross-linked to obtain a wrinkle-resistant cotton fabric.

The anti-wrinkle cotton fabric prepared according to the method was tested by the national standards GB/T 3819-1997 and GB/T 3923.1-2013, and the wrinkle recovery angle was 197.64°, and the strength retention rate was 102.9%.

Example 2:

First, prepare a solution of α-lipoic acid with a concentration of 100g/L, and add 100g/L α-lipoic acid, 100g/L N-N'-dicyclohexylcarbodiimide and 60g/L to dimethyl sulfoxide. -Dimethylaminopyridine. Shake for 30 minutes at 30°C, then immerse the cotton fabric in the solution at a bath ratio of 1:50, shake for 24 hours, and set the temperature at 30°C. After the grafting is completed, it is washed with water, then placed in absolute ethanol for ultrasonic cleaning for 30 minutes, washed with water, and dried to obtain a cotton fabric grafted with α-lipoic acid.

Using GB/T 8629-2001 "Household Washing and Drying Procedures for Textile Testing" and GB/T 13769-2009 "Test Methods for Evaluating the Appearance Flatness of Textiles after Washing", the anti-wrinkle cotton fabrics were tested for washing resistance.

The anti-wrinkle cotton fabric prepared according to the method was tested by the national standards GB/T 3819-1997 and GB/T 3923.1-2013, and the wrinkle recovery angle was 248.63°, and the strength retention rate was 105.6%. After 10 times of washing, the wrinkle recovery angle of the fabric was 229.75°.

Example 3:

First, prepare a solution of α-lipoic acid with a concentration of 150g/L, and add 150g/L α-lipoic acid, 150g/L N-N'-dicyclohexylcarbodiimide and 90g/L to dimethyl sulfoxide in turn. -Dimethylaminopyridine. Shake for 30 minutes at 30°C, then immerse the cotton fabric in the solution at a bath ratio of 1:50, shake for 24 hours, and set the temperature at 30°C. After the grafting is completed, it is washed with water, then placed in absolute ethanol for ultrasonic cleaning for 30 minutes, washed with water, and dried to obtain a cotton fabric grafted with α-lipoic acid.

The wrinkle recovery angle of the anti-wrinkle cotton fabric prepared according to the method is 250.62° and the strength retention rate is 103.9% after the national standards GB/T 3819-1997 and GB/T 3923.1-2013 test.

Example 4:

Put the cotton fabric grafted with lipoic acid into 0.1mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours. The disulfide bond of lipoic acid on the cotton fabric is cross-linked to obtain a wrinkle-resistant cotton fabric.

The anti-wrinkle cotton fabric prepared according to the method was tested by the national standards GB/T 3819-1997 and GB/T 3923.1-2013, and the wrinkle recovery angle was 200.51°, and the strength retention rate was 105.6%.

Example 5:

Put the cotton fabric grafted with lipoic acid into 1mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction is complete, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours. The disulfide bond of lipoic acid on the cotton fabric is cross-linked to obtain a wrinkle-resistant cotton fabric.

The anti-wrinkle cotton fabric prepared according to the method was tested by the national standards GB/T 3819-1997 and GB/T 3923.1-2013, and the wrinkle recovery angle was 231.68°, and the strength retention rate was 101.6%.

Comparative Example 1: Compared with Example 2, without α-lipoic acid

First add 100g/L N-N'-dicyclohexylcarbodiimide and 60g/L 4-dimethylaminopyridine to dimethyl sulfoxide. Shake for 30 minutes at 30°C, then immerse the cotton fabric in the solution at a bath ratio of 1:50, shake for 24 hours, and set the temperature at 30°C. After completion, wash with water, then put it in absolute ethanol for ultrasonic cleaning for 30 minutes, wash with water, and dry.

Put the dried cotton fabric into 0.5mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction is complete, apply tension to the cotton fabric to fix, and bake at 160℃ 3min to eliminate wrinkles in the finishing process, followed by constant tension ventilation and oxidation for 6h.

Tested by the national standards GB/T 3819-1997 and GB/T 3923.1-2013, the wrinkle recovery angle is 129.82°, and the strength retention rate is 98.1%.

Comparative Example 2: Compared with Example 2, the reduction step is omitted

Apply tension to the cotton fabric grafted with lipoic acid and bake it at 160°C for 3 minutes to eliminate wrinkles in the finishing process, and then ventilate and oxidize with constant tension for 6 hours. The disulfide bond of lipoic acid on the cotton fabric is cross-linked to obtain a wrinkle-resistant cotton fabric.

Tested by the national standards GB/T 3819-1997 and GB/T 3923.1-2013, the wrinkle recovery angle is 130.23°, and the strength retention rate is 97.4%. It can be seen that the anti-wrinkle effect is poor after the reduction step is omitted.

Comparative example 3: Traditional BTCA finishing

First, configure a finishing solution with a concentration of butanetetracarboxylic acid (BTCA) of 20g/L and a concentration of sodium hypophosphite of 10g/L, and then use the same cotton fabric as the embodiment in the finishing solution for two dipping and two rolling. The rate was 90%, pre-baked at 80°C for 3 minutes, and baked at 180°C for 2 minutes. The fabric properties were tested according to the same test method as the examples.

Tested by the national standards GB/T 3819-1997 and GB/T 3923.1-2013, the wrinkle recovery angle is 246.74°, and the strength retention rate is 65.1%.

The anti-wrinkle cotton fabric obtained by the treatment of the present invention has an obvious anti-wrinkle effect. In the above embodiment, the wrinkle recovery angle of the cotton fabric is increased by at least 70°, and the wrinkle recovery angle with the best anti-wrinkle effect is even increased by about 120°; Compared with the result of ratio 3, there is no damage to the strong force.

Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention should be defined by the claims.

Claims

An anti-wrinkle finishing method for cotton fabrics, characterized in that the method is to immerse the cotton fabrics in a solution containing lipoic acid analogs to undergo an esterification reaction; and then use a reducing agent to reduce the disulfide bonds in the lipoic acid analogs to The two sulfhydryl groups are finally oxidized in the air to obtain anti-wrinkle cotton fabric; the lipoic acid analog is a class of compounds having both a carboxyl group and a disulfide bond, or a carboxyl group and a sulfhydryl group; the lipoic acid analog is α-lipoic acid , Cystine or cysteine; the method specifically includes the following steps:

(1) First dissolve the lipoic acid analog in the dimethyl sulfoxide solution, then add N-N'-dicyclohexylcarbodiimide and 4-dimethylaminopyridine, shake to activate, and then put it into the cotton fabric, Shake, wash and dry after the reaction is completed to obtain a cotton fabric grafted with lipoic acid analogues;

(2) The cotton fabric grafted with lipoic acid analog is placed in a sodium borohydride solution for reduction, washed with water after reduction, baked, and then oxidized in the air to obtain a wrinkle-resistant cotton fabric.
An anti-wrinkle finishing method for cotton fabrics, characterized in that the method is to immerse the cotton fabrics in a solution containing lipoic acid analogs to undergo an esterification reaction; and then use a reducing agent to reduce the disulfide bonds in the lipoic acid analogs to The two sulfhydryl groups are finally oxidized in the air to obtain anti-wrinkle cotton fabric; the lipoic acid analog is a type of compound having both a carboxyl group and a disulfide bond, or a carboxyl group and a sulfhydryl group.
The anti-wrinkle finishing method of cotton fabric according to claim 2, wherein the method specifically comprises the following steps:

(1) First dissolve the lipoic acid analog in the dimethyl sulfoxide solution, then add N-N'-dicyclohexylcarbodiimide and 4-dimethylaminopyridine, shake to activate, and then put it into the cotton fabric, Shake, wash and dry after the reaction is completed to obtain a cotton fabric grafted with lipoic acid analogues;

(2) The cotton fabric grafted with lipoic acid analog is placed in a sodium borohydride solution for reduction, washed with water after reduction, baked, and then oxidized in the air to obtain a wrinkle-resistant cotton fabric.
The anti-wrinkle finishing method for cotton fabrics according to claim 3, characterized in that the concentration of lipoic acid analogue in step (1) is 50～150g/L, N-N'-dicyclohexylcarbodiimide The concentration is 50-150 g/L, and the concentration of 4-dimethylaminopyridine is 30-90 g/L.
The anti-wrinkle finishing method of cotton fabric according to claim 3 or 4, characterized in that, in the step (1), the activation time of the lipoic acid analog is 30-60 min, and the shaking temperature is 20-40°C.
The anti-wrinkle finishing method for cotton fabrics according to claim 3 or 4, characterized in that, in the step (1), the bath ratio of the cotton fabric in the lipoic acid analog solution is 1:20-50, and the reaction time It is 12～36h, and the shaking temperature is 20～40℃.
The anti-wrinkle finishing method of cotton fabric according to claim 3 or 4, characterized in that, in the step (1), the cotton fabric after grafting is cleaned in anhydrous ethanol for 30-60 minutes by ultrasonic cleaning.
The anti-wrinkle finishing method of cotton fabric according to any one of claims 3 or 4, characterized in that in the step (2), the concentration of the sodium borohydride solution is 0.1-1 mol/L, and the reduction time is 30-60 min; The baking temperature of the latter cotton fabric is 120-180 DEG C, and the baking time is 2-5 minutes; the oxidation time of the cotton fabric after baking in the air is 6-24h.
The anti-wrinkle finishing method for cotton fabrics according to claim 3 or 4, characterized in that, firstly, a solution of α-lipoic acid with a concentration of 50g/L is prepared, and 50g/L α-lipoic acid is sequentially added to dimethyl sulfoxide. , 50g/L N-N'-dicyclohexylcarbodiimide and 30g/L 4-dimethylaminopyridine; shake at 30℃ for 30min, and then immerse the cotton fabric in the solution with a bath ratio of 1:50 , Oscillate for 24h, and the temperature is 30℃; after the grafting is completed, wash with water, then put it in absolute ethanol for ultrasonic cleaning for 30min, wash with water, and dry to obtain a cotton fabric grafted with α-lipoic acid;

Put the cotton fabric grafted with lipoic acid into 0.5mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction is complete, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours; the disulfide bond of lipoic acid on the cotton fabric is cross-linked to obtain a wrinkle-resistant cotton fabric.
The anti-wrinkle finishing method for cotton fabrics according to claim 3 or 4, characterized in that firstly, an α-lipoic acid solution with a concentration of 100g/L is prepared, and 100g/L α-lipoic acid is sequentially added to dimethyl sulfoxide. , 100g/L N-N'-dicyclohexylcarbodiimide and 60g/L 4-dimethylaminopyridine; shake at 30℃ for 30min, and then immerse the cotton fabric in the solution with a bath ratio of 1:50 , Oscillate for 24h, and the temperature is 30℃; after the grafting is completed, wash with water, then put it in absolute ethanol for ultrasonic cleaning for 30min, wash with water, and dry to obtain a cotton fabric grafted with α-lipoic acid;

Put the cotton fabric grafted with lipoic acid into 0.5mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction is complete, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours to complete the crosslinking of lipoic acid disulfide bonds on the cotton fabric to obtain a wrinkle-resistant cotton fabric.
The anti-wrinkle finishing method for cotton fabrics according to claim 3 or 4, characterized in that firstly, an α-lipoic acid solution with a concentration of 150g/L is prepared, and 150g/L α-lipoic acid is sequentially added to dimethyl sulfoxide. , 150g/L N-N'-dicyclohexylcarbodiimide and 90g/L 4-dimethylaminopyridine; shake at 30°C for 30 minutes, and then immerse the cotton fabric in the solution with a bath ratio of 1:50 , Oscillate for 24h, and the temperature is 30℃; after the grafting is completed, wash with water, then put it in absolute ethanol for ultrasonic cleaning for 30min, wash with water, and dry to obtain a cotton fabric grafted with α-lipoic acid;

Put the cotton fabric grafted with lipoic acid into 0.5mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction is complete, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours to complete the crosslinking of lipoic acid disulfide bonds on the cotton fabric to obtain a wrinkle-resistant cotton fabric.
The anti-wrinkle finishing method for cotton fabrics according to claim 3 or 4, characterized in that firstly, an α-lipoic acid solution with a concentration of 100g/L is prepared, and 100g/L α-lipoic acid is sequentially added to dimethyl sulfoxide. , 100g/L N-N'-dicyclohexylcarbodiimide and 60g/L 4-dimethylaminopyridine; shake at 30℃ for 30min, and then immerse the cotton fabric in the solution with a bath ratio of 1:50 , Oscillate for 24h, and the temperature is 30℃; after the grafting is completed, wash with water, then put it in absolute ethanol for ultrasonic cleaning for 30min, wash with water, and dry to obtain a cotton fabric grafted with α-lipoic acid;

Put the cotton fabric grafted with lipoic acid into 0.1mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours to complete the crosslinking of lipoic acid disulfide bonds on the cotton fabric to obtain a wrinkle-resistant cotton fabric.
The anti-wrinkle finishing method for cotton fabrics according to claim 3 or 4, characterized in that firstly, an α-lipoic acid solution with a concentration of 100g/L is prepared, and 100g/L α-lipoic acid is sequentially added to dimethyl sulfoxide. , 100g/L N-N'-dicyclohexylcarbodiimide and 60g/L 4-dimethylaminopyridine; shake at 30℃ for 30min, and then immerse the cotton fabric in the solution with a bath ratio of 1:50 , Oscillate for 24h, and the temperature is 30℃; after the grafting is completed, wash with water, then put it in absolute ethanol for ultrasonic cleaning for 30min, wash with water, and dry to obtain a cotton fabric grafted with α-lipoic acid;

Put the cotton fabric grafted with lipoic acid into 1mol/L sodium borohydride solution, bath ratio is 1:80, shake at room temperature for 0.5h, wash with water after reduction is complete, apply tension to the cotton fabric and fix it at 160℃ Bake for 3 minutes to eliminate wrinkles in the finishing process, and then oxidize with constant tension for 6 hours. The disulfide bond of lipoic acid on the cotton fabric is cross-linked to obtain a wrinkle-resistant cotton fabric.
The anti-wrinkle finishing method for cotton fabrics according to any one of claims 2 to 4, wherein the lipoic acid analog is α-lipoic acid, cystine or cysteine.
The cotton fabric obtained by finishing the method according to any one of claims 1-14.
A garment or fabric containing the cotton fabric of claim 15.
An application of lipoic acid analogue in the anti-wrinkle finishing of cotton fabrics, characterized in that the lipoic acid analogue is a compound having both a carboxyl group and a disulfide bond, or a carboxyl group and a mercapto group.
An anti-wrinkle finishing liquid for cotton fabrics, characterized in that the finishing liquid is divided into liquid A and liquid B, wherein liquid A is a lipoic acid analogue containing 50～150g/L, N-N'-dicyclohexyl carbon dioxide A solution of 50～150g/L of imine and 30～90g/L of 4-dimethylaminopyridine; solution B is a solution containing 0.1～1mol/L of sodium borohydride; the lipoic acid analogue has both a carboxyl group and a disulfide Bond, or a class of compounds of carboxyl and sulfhydryl.
A method for using the anti-wrinkle finishing liquid for cotton fabrics according to claim 18, characterized in that the cotton fabric is placed in liquid A, the bath ratio is 1:20-50, and the treatment time is 12-36h at 20-40°C; end Rinse with water and dry; then put it in B solution, bath ratio is 1:50-100, immerse for 0.5-1h, wash with water, bake, and oxidize in air.