阅读说明：本技术 一种低强力损失高性能环保的棉织物免烫整理方法 (Low-strength-loss high-performance environment-friendly non-ironing finishing method for cotton fabric ) 是由 黄其智 杨成华 秦小臣 黄尚东 杨之卓 李杰国 于 2019-12-03 设计创作，主要内容包括：本发明涉及低强力损失高性能环保的棉织物免烫整理方法,首先对棉织物进行热水处理、恒温干燥,在其无定型区形成新的结晶区域,然后进行无甲醛免烫整理,得到一种低强力损失高性能环保的棉织物,具体流程是：热水处理——恒温干燥——浸轧免烫整理液——预烘——焙烘。本发明让水分子棉纤维无定形区的大分子链定向排列,产生新的结晶区,结晶区相对与无定型区,其弹性模量和强度均较高,对免烫等级的提升和强力损失的降低均有重要作用,而免烫整理则在无定型区形成新的交联网络结构,提高棉纤维的免烫抗皱性能。(The invention relates to a non-ironing finishing method of a cotton fabric with low strength loss and high performance, which comprises the following steps of firstly carrying out hot water treatment and constant temperature drying on the cotton fabric, forming a new crystallization area in an amorphous area of the cotton fabric, and then carrying out non-formaldehyde non-ironing finishing to obtain the cotton fabric with low strength loss and high performance, wherein the specific flow is as follows: hot water treatment, constant temperature drying, padding of non-ironing finishing liquid, pre-drying and baking. The macromolecular chains in the amorphous area of the water molecular cotton fiber are directionally arranged to generate a new crystalline area, the crystalline area is opposite to the amorphous area, the elastic modulus and the strength of the crystalline area are high, the crystalline area and the amorphous area play an important role in improving the non-ironing grade and reducing the strength loss, and the non-ironing finishing forms a new cross-linked network structure in the amorphous area to improve the non-ironing crease resistance of the cotton fiber.)

1. A low strength loss high performance environment-friendly cotton fabric non-ironing finishing method is characterized by comprising the following steps:

(1) hot water treatment, namely placing the cotton fabric into hot water at a certain temperature for treatment for a certain time;

(2) drying at constant temperature, namely taking out the cotton fabric treated by hot water and drying at constant temperature to enable the fabric to form a new crystallization area in an amorphous area;

(3) padding the non-ironing finishing liquid, and performing non-formaldehyde non-ironing finishing on the cotton fabric dried at constant temperature;

(4) pre-drying, namely pre-drying the cotton fabric subjected to the non-ironing finishing;

(5) and (5) baking, namely baking the pre-baked cotton fabric.

2. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: the temperature of the hot water in the step (1) is 90-100 ℃.

3. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: the treatment time in the step (1) is 2-4 hours.

4. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: the temperature of the constant-temperature drying in the step (2) is 40-50 ℃.

5. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: and (3) drying at constant temperature for 1-3 hours.

6. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: the non-ironing finishing liquid in the step (3) comprises a non-ironing finishing auxiliary agent, a catalyst, a fiber protective agent, a softening agent and water.

7. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: the non-ironing finishing assistant in the step (3) is a formaldehyde-free non-ironing finishing assistant of modified alkyl dihydroxy ethylene urea.

8. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: the catalyst in the step (3) is magnesium chloride or a composite catalyst, the composite catalyst is formed by compounding metal salt and hydroxycarboxylic acid, the metal salt is at least one of magnesium chloride, magnesium nitrate, zinc chloride and zinc nitrate, and the hydroxycarboxylic acid is at least one of citric acid, dimethylolpropionic acid and dimethylolbutyric acid.

9. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: and (4) the pre-drying temperature is 100-110 ℃.

10. The non-ironing finishing method for the low-strength-loss high-performance environment-friendly cotton fabric according to claim 1, which is characterized by comprising the following steps: and (5) baking at the temperature of 130-160 ℃ for 2-5 min.

Technical Field

The invention belongs to the technical field of fabric finishing, and particularly relates to a low-strength-loss high-performance environment-friendly non-ironing finishing method for cotton fabrics.

Background

Cotton fabrics are the most popular textiles in the world all the time, and are highly popular among people due to the advantages of good air permeability, strong moisture absorption, comfortable wearing, soft hand feeling, low price, biodegradability and the like. However, cotton fabrics are easy to wrinkle, stiff and smooth and not beautiful in wearing and washing processes, and bring much inconvenience to the life and use of people. Nowadays, with the continuous improvement of living standard of people, the wearing comfort level and other aspects have higher requirements, and the research of the non-ironing resin and the finishing process thereof also become hot spots of research and development in the field of textile auxiliary agents.

Currently, N-methylolamide resins, known as 2D resins or 2D modified resins, are widely used. The resin can endow the cotton fabric with better non-ironing effect, and meanwhile, the synthetic process is simple and the price is low, so the resin is a mainstream product in the market. However, the resin has formaldehyde release in the production, textile finishing application, storage and use links, which affects the health of production operators and consumers. The patent application No. CN110318256A 'preparation method of low-formaldehyde non-ironing resin' discloses a preparation method of modified 2D resin, the non-ironing resin prepared by the method is used for finishing cotton fabrics, the DP level of the non-ironing performance of the non-ironing resin reaches 3.4, the formaldehyde of stock solution, the formaldehyde of cloth cover and the released formaldehyde are higher, the breaking strength is lower, and the strength loss is larger.

In recent years, along with the increasing awareness of environmental protection and safety, formaldehyde-free non-ironing resins become a research and development hotspot in the industry, butane tetracarboxylic acid is considered to be the polycarboxylic acid type formaldehyde-free non-ironing resin with the best effect at present, but because of high cost and high price, industrialization is difficult to realize at present. Amide resins (N, N-1, 3-dimethyl-4, 5-dihydroxyethylene urea) similar to 2D resin in structure appear in the market at present, and the resins avoid formaldehyde residue and formaldehyde release, but have poorer non-ironing performance than the 2D resin and are difficult to popularize in a large range. Patent CN106496481A "a method for preparing formaldehyde-free easy-care resin" discloses a method for preparing formaldehyde-free easy-care resin, the easy-care resin prepared by the method can endow fabric with better easy-care grade, and has no formaldehyde release problem, but the strength loss is very large, and the loss is more than 40%.

After the cotton fabric is subjected to non-ironing finishing, the strength of the cotton fabric is generally lost to a large extent, and the wearability of the cotton fabric is seriously influenced. Research has found that there are two main causes of reduced strength: the non-ironing finishing agent forms intramolecular and intermolecular crosslinking in cotton and other cellulose fibers, so that the movement of cellulose macromolecular chain segments in the cotton and other cellulose fibers is limited, stress concentration is caused, and intramolecular and intermolecular crosslinking mainly occurs in amorphous areas of the cotton and other cellulose fibers; another reason is that most of the catalysts used in the resin finishing methods are acidic or latent-acidic catalysts, and acidic catalysis can cause degradation of macromolecular chains of cellulose, resulting in acidic damage to cotton and other cellulose fibers. The problem of great strength loss caused by non-ironing finishing is solved, and no good solution is reported in the literature at present.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the non-ironing finishing method of the cotton fabric with low strength loss and high performance, and the cotton fabric finished by the method has low strength loss and good non-ironing crease resistance.

The technical scheme for solving the technical problem is as follows: a low strength loss high performance environment-friendly cotton fabric non-ironing finishing method comprises the following steps of firstly carrying out hot water treatment and constant temperature drying on cotton fabric, forming a new crystallization area in an amorphous area of the cotton fabric, and then carrying out formaldehyde-free non-ironing finishing to obtain the low strength loss high performance environment-friendly cotton fabric non-ironing finishing method, which specifically comprises the following steps:

(1) hot water treatment, namely placing the cotton fabric into hot water at a certain temperature for treatment for a certain time;

(2) drying at constant temperature, taking out the cotton fabric treated by hot water, and drying at constant temperature;

(3) padding the non-ironing finishing liquid, namely padding the cotton fabric dried at constant temperature with the non-ironing finishing liquid;

(4) pre-drying, namely pre-drying the cotton fabric subjected to the non-ironing finishing;

(5) and (5) baking, namely baking the pre-baked cotton fabric.

Wherein: the temperature of the hot water in the step (1) is 90-100 ℃.

The treatment time in the step (1) is 2-4 hours.

The temperature of the constant-temperature drying in the step (2) is 40-50 ℃.

And (3) drying at constant temperature for 1-3 hours.

The non-ironing finishing liquid in the step (3) comprises a non-ironing finishing auxiliary agent, a catalyst, a fiber protective agent, a softening agent and water.

The non-ironing finishing assistant in the step (3) is a formaldehyde-free non-ironing finishing assistant of modified alkyl dihydroxy ethylene urea.

The catalyst in the step (3) is magnesium chloride or a composite catalyst, the composite catalyst is formed by compounding metal salt and hydroxycarboxylic acid, the metal salt is at least one of magnesium chloride, magnesium nitrate, zinc chloride and zinc nitrate, and the hydroxycarboxylic acid is at least one of citric acid, dimethylolpropionic acid and dimethylolbutyric acid.

And (4) pre-drying the cotton fabric at the pre-drying temperature of 100-110 ℃ to 6-8 dry.

And (5) baking at the temperature of 130-160 ℃ for 2-5 min.

The invention has the beneficial effects that:

1. the purpose of hot water treatment of the cotton fabric is to enable macromolecular chains in an amorphous area of the water molecular cotton fiber to be directionally arranged to generate a new crystalline area, the original crystalline area is unchanged, new crystals are formed in the amorphous area, and the crystalline area and the amorphous area are relatively higher in elastic modulus and strength and play an important role in improving the non-ironing grade and reducing the strength loss.

2. The non-ironing finishing is to form a new cross-linked network structure in an amorphous area so as to improve the non-ironing crease-resistant performance of the cotton fiber.

Detailed Description

The following detailed description of embodiments of the invention is intended to be illustrative, but not limiting, of the invention.

The application performance test of the obtained non-ironing finishing cotton fabric comprises the following steps:

a) and measuring the non-ironing effect: refer to the national standard GB/T3819-1997 determination of the recovery angle method of the crease recovery of textile fabrics.

b) And breaking strength: reference to GB/T3923.1-2013 textile fabric tensile properties part 1: determination of breaking Strength and elongation at Break (bar method).

c) Tearing strength: reference to GB-T3917.1-2009 textile fabric tear performance part 1: and (3) measuring the tearing strength by an impact pendulum method.

d) And measuring the content of free formaldehyde: reference to the national standard GB/T2912.1-2009 determination of textile Formaldehyde part 1: free and hydrolysed formaldehyde (water extraction).