CN103643526B - A kind of method adopting Ludox to prepare crease-resistant COTTON FABRIC - Google Patents

Abstract

The present invention relates to a method for preparing anti-wrinkle cotton fabric by using silica sol, comprising: (1) dissolving catalyst and silicate in deionized water successively, then adding an acid release agent into the solution, stirring to dissolve, and immersing the cotton fabric in the above-mentioned solution, control the temperature at 10-30°C, last for 1-48 hours, dip twice and roll twice, with a liquid retention rate of 80-85%, wash with water after drying, and then dry; (2) Immerse the above cotton fabric in the anti-wrinkle finishing solution , impregnated for 3 to 5 minutes, then dipped twice and rolled twice, with a liquid retention rate of 80-85%, and finally dried and baked. The tensile breaking strength of the fabric prepared by the invention is significantly improved, and the problem of strength decline of the current anti-wrinkle finishing fabric is obviously improved, and has wide application prospects and market prospects.

Description

A kind of method adopting silica sol to prepare anti-wrinkle cotton fabric

technical field

The invention belongs to the field of functional fabrics, in particular to a method for preparing wrinkle-resistant cotton fabrics by using silica sol.

Background technique

With the development of society and the advancement of science and technology, people's material life is becoming more and more abundant. Now people are no longer satisfied with food and clothing, but also begin to pursue rich spiritual culture. Consumers' requirements for the selection of fabrics have also changed. They are not limited to traditional colorful clothing, but pay more attention to the functionality and convenience of clothing. Because cotton fabric has the characteristics of comfortable wearing and good hygroscopicity, it is liked by people, but it is easy to wrinkle and difficult to care, so it cannot meet people's daily needs. Therefore, the anti-wrinkle finishing of cotton fabric has important practical significance. The main reason for the wrinkling of cotton fabrics is that the hydroxyl groups on the molecular chains in the amorphous region of cotton fibers can slip under the action of external force, and form hydrogen bonds in new positions to prevent the molecular chains from returning to their original state. At present, 2D resins are mainly used in the industry for anti-wrinkle finishing of cotton fabrics. This method has a good anti-wrinkle effect, but the strength of the finished fabrics is severely reduced when the formaldehyde is released. Even if the 2D resin is modified by etherification, formaldehyde cannot be avoided. release. With the improvement of environmental protection requirements, formaldehyde-free anti-wrinkle finishing has emerged at the historic moment. The most widely used formaldehyde-free anti-wrinkle finishing agent is polycarboxylic acid finishing agent, and BTCA has the best finishing effect. The anti-wrinkle effect after finishing with 2D resin and polycarboxylic acid is realized by the formation of covalent cross-links between the finishing agent and the freely movable hydroxyl groups on the cotton fiber molecular chain. Due to the formation of covalent crosslinks between the cellulose molecular chains, compared with unfinished fabrics, the mobility between the basic structural units is limited, and the external force is more uneven, which will cause the strength of the fabric to decrease, which cannot satisfy consumers. It is of practical significance to improve the strength of anti-wrinkle finishing fabrics.

The sol-gel method uses compounds containing highly chemically active components as precursors, uniformly mixes these raw materials in the liquid phase, and undergoes hydrolysis and condensation chemical reactions to form a stable transparent sol system in the solution. Slowly polymerize among the colloidal particles to form a gel with a three-dimensional space network structure. The gel is dried, sintered and solidified to prepare molecular and even nano-substructure materials. Different types of sols can be used for finishing textiles by dipping, spraying or continuous coating. At present, fabrics are mostly coated by padding, and then dried under certain conditions to form a thin and transparent metal or silicon oxide film on the surface of the textile. performance.

Since the pore size of the cotton fabric is about 10nm, if the fabric is directly dipped into the sol, it is difficult for the large-particle sol to enter the micropores of the cotton fiber and is easy to wash away; when the fabric is soaked in the solution and dried, the solution that penetrates into the micropores evaporates with the water Moving outward, gel is also formed between microfibrils or fibers, and it is difficult to exist in the pores of cotton fibers. The cotton fabric is immersed in the silicate solution containing the acid-releasing agent at low temperature. As time goes by, the acid-releasing agent is hydrolyzed to release the acid, thereby reducing the pH value of the solution. The silicate molecules in the solution are evenly distributed, and the fibers are microporous. The small silicate molecules inside also slowly condense and grow up, and then form a sol and fix it inside the fiber channel, which cannot come out after drying. The gel deposited between the fiber micropores or microfibrils can improve the bonding between fibers or molecular chains. Therefore, the method of studying the low-temperature in-situ growth of silica sol points out a new direction for improving the strength of wrinkle-resistant fabrics.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for preparing wrinkle-resistant cotton fabrics by using silica sol, the tensile breaking strength of the fabrics prepared by this method is significantly improved, and the problem of strength decline of current wrinkle-resistant finishing fabrics is significantly improved. It has broad application prospect and market prospect.

A kind of method adopting silica sol to prepare wrinkle-resistant cotton fabric of the present invention comprises:

(1) Dissolve the catalyst and the silicate in deionized water successively, then add an acid release agent into the solution, stir to dissolve, immerse the cotton fabric in the above solution, control the temperature at 10-30°C for 1-48 hours, and then Dipping and rolling, the liquid rate is 80-85%, washed with water after drying, and then dried; wherein, the amount of silicate is 1-5% of the solution mass, and the molar ratio of catalyst to silicate is 0-0.5. The amount of acid agent is 1-4% of the solution mass;

(2) Immerse the above-mentioned cotton fabric in the anti-wrinkle finishing solution for 3-5 minutes, then soak twice and roll twice, with a liquid retention rate of 80-85%, and finally dry and bake.

The catalyst in the step (1) is one of ammonium sulfate and acetic acid; the silicate is sodium silicate; the acid release agent is DL-panthenolactone, gluconolactone, glycerol monoacetate, ethyl One of the glycol diacetates.

The drying method in the step (1) is drying on a heat setting machine, the drying temperature is 80-120° C., and the drying time is 1-3 minutes.

The washing method in the step (1) is machine washing at room temperature, and the washing time is 5-30 minutes.

The composition of the anti-wrinkle finishing liquid in the step (2) includes: anti-wrinkle finishing agent, catalyst, initiator, strong protective agent and water; wherein, the anti-wrinkle finishing agent is 3-9% of the mass of the finishing liquid, and the initiator is anti-wrinkle finishing 0-1.5% of the mass of the finishing agent, the molar ratio of the catalyst to the anti-wrinkle finishing agent is 1:2-2:1, the strong protective agent is 0-2% of the mass of the finishing liquid, and the balance is water.

The anti-wrinkle finishing agent is polycarboxylic acid anti-wrinkle finishing agent; the catalyst is one of sodium hypophosphite, disodium hydrogen phosphate, and sodium dihydrogen phosphate; the initiator is sodium peroxodisulfate or peroxodisulfate Potassium; The strong protective agent is triethanolamine.

The polycarboxylic acid anti-wrinkle finishing agent is one or two of maleic acid MA, itaconic acid IA, butane tetracarboxylic acid BTCA, and citric acid CA.

The drying method in the step (2) is drying on a heat setting machine, the drying temperature is 80-100° C., and the drying time is 3-10 minutes.

The baking temperature in the step (2) is 160-180° C., and the baking time is 1-3 minutes.

In the present invention, low-temperature in-situ growth of silica sol and anti-wrinkle finishing are performed in two steps. First, the cotton fabric is immersed in a mixed solution of silicate, catalyst and acid release agent under low temperature conditions. When the pH is high, the mixed solution is a small molecule. Because the pore size of cotton fiber is about 10nm, small molecules can be evenly distributed between the micropores and microfibers of cotton fiber. With the hydrolysis of the acid release agent, the pH of the mixed solution gradually decreases. When the conditions for forming a sol are reached, Small molecules undergo polycondensation reaction to form sol and deposit in the microfibers or micropores of cotton fabrics. After drying, they can deposit in the microfibers or micropores, and are not easy to remove after washing, thus hindering the slippage of cotton fibers or molecular chains. , which in turn enhances the tensile breaking strength of the fabric, and the tensile breaking strength of the fabric obtained by further anti-wrinkle finishing is significantly improved compared with the fabric which is individually anti-wrinkle finishing. Using this physical and chemical method to treat cotton fabrics, the tensile breaking strength of the obtained fabrics is higher than that of cotton fabrics treated alone, and the wrinkle recovery angle is hardly affected.

Beneficial effect

(1) Compared with the traditional anti-wrinkle finishing process, the present invention has simple preparation method, low cost, no increase in energy consumption, and is convenient for industrial production;

(2) In the present invention, the colloidal particles are condensed from small molecules to become larger and fixed between the cotton fibers or in the microporous structure of the fibers. This fixation method can be closely combined with the fibers, making the finishing effect longer and more resistant to washing;

(3) The tensile breaking strength of the fabric prepared by the present invention is significantly improved, and the strength drop problem of the current anti-wrinkle finishing fabric is significantly improved, and has wide application prospects and market prospects.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

Dissolve 2.164g of catalyst (NH ₄ ) ₂ SO ₄ and 9.32g of Na ₂ SiO ₃ 9H ₂ O in 200mL of deionized water, then add 6g of acid release agent DL-pantothenolactone into the solution, stir rapidly to dissolve , soak the cotton fabric in the above solution, control the temperature at 18°C, continue for 24 hours, dip and roll twice, the liquid retention rate is 80%, dry at 80°C for 3 minutes, wash with water for 10 minutes, and then dry at 80°C for 3 minutes;

Both the above-mentioned cotton fabrics and untreated cotton fabrics were immersed in the anti-wrinkle finishing solution for 3 minutes, then dipped and rolled twice, the liquid retention rate was 85%, dried at 100°C for 10 minutes, and then baked at 180°C for 1.5 minutes. The anti-wrinkle finishing solution includes: MA-IA anti-wrinkle finishing agent with a mass fraction of 6%, sodium hypophosphite, potassium peroxodisulfate and triethanolamine, and the balance is deionized water. Wherein the mol ratio of MA and IA is 1:1, the mol ratio of sodium hypophosphite and the sum of MA and IA is 1:1, potassium peroxodisulfate is 1.5% of the anti-wrinkle finishing agent quality, and triethanolamine is 1% of the finishing liquid quality 2%.

Example 2

Dissolve 9.32g Na ₂ SiO ₃ ·9H ₂ O in 200mL of deionized water, then add 6g of acid release agent DL-pantothenolactone into the solution, stir rapidly to dissolve, immerse the cotton fabric in the above solution, and control the temperature at 22°C , after 24 hours, double dipping and rolling, the liquid retention rate is 80%, dry at 80°C for 3 minutes, wash with water for 10 minutes, and then dry for 3 minutes;

Both the above-mentioned cotton fabrics and untreated cotton fabrics were immersed in the anti-wrinkle finishing solution for 3 minutes, then dipped and rolled twice, the liquid retention rate was 85%, dried at 100°C for 10 minutes, and then baked at 180°C for 1.5 minutes. The anti-wrinkle finishing solution includes: MA-IA anti-wrinkle finishing agent with a mass fraction of 8%, sodium hypophosphite, potassium peroxodisulfate and triethanolamine, and the balance is deionized water. Wherein the mol ratio of MA and IA is 1:1, the mol ratio of sodium hypophosphite and the sum of MA and IA is 1:1, potassium peroxodisulfate is 1.5% of the anti-wrinkle finishing agent quality, and triethanolamine is 1% of the finishing liquid quality 2%.

Example 3

Dissolve 9.32g Na ₂ SiO ₃ ·9H ₂ O in 200mL of deionized water, then add 6g of acid release agent DL-pantothenolactone into the solution, stir rapidly to dissolve, immerse the cotton fabric in the above solution, and control the temperature at 20°C , after 24 hours, double dipping and rolling, the liquid retention rate is 80%, dry at 80°C for 3 minutes, wash with water for 10 minutes, and then dry for 3 minutes;

Both the above-mentioned cotton fabric and the untreated cotton fabric were immersed in the anti-wrinkle finishing solution for 5 minutes, then dipped twice and rolled twice, with a liquid retention rate of 85%, dried at 80°C for 3 minutes, and then baked at 180°C for 1.5 minutes. The anti-wrinkle finishing solution contains: BTCA anti-wrinkle finishing agent with a mass fraction of 4% and sodium hypophosphite, wherein the molar ratio of sodium hypophosphite to BTCA is 1:1, triethanolamine is 2% of the mass of the finishing solution, and the balance is Deionized water.

Cut the finished fabric into samples and equilibrate for at least 4 hours in a constant temperature and humidity room (temperature 21±1°C and humidity 65±2%) for at least 4 hours to be tested. Various index tests are carried out on the finished fabric, as follows:

The anti-wrinkle performance test is tested on the elastic recovery instrument of SDL company in the United States according to the AATCC66-2003 standard.

The breaking strength test refers to GB3923.1-1997 Textile Fabric Tensile Properties Part 1: Determination of breaking strength and elongation at break. It is measured on the H10KS strength tester of Tiniius Olsen Company in the United States.

Table 1 The wrinkle resistance of fabrics before and after silica sol finishing in Example 1

The wrinkle resistance of fabric before and after silica sol finishing in embodiment 2 in table 2

Table 3 The wrinkle resistance of fabrics before and after silica sol finishing in embodiment 3

Claims (9)

1. A method for preparing wrinkle-resistant cotton fabrics using silica sol, comprising: (1) Dissolve the catalyst and the silicate in deionized water successively, then add an acid release agent into the solution, stir to dissolve, immerse the cotton fabric in the above solution, control the temperature at 10-30°C, and continue for 1-48h. Soaking and rolling twice, with a liquid rate of 80-85%, washing with water after drying, and then drying; wherein, the amount of silicate is 1-5% of the solution mass, and the molar ratio of catalyst to silicate is 0-0.5. The amount of acid agent is 1-4% of the solution mass; wherein the acid release agent is one of DL-pantothenolactone, gluconolactone, glycerol monoacetate, and ethylene glycol diacetate; (2) Immerse the above-mentioned cotton fabric in the anti-wrinkle finishing solution for 3-5 minutes, then soak twice and roll twice, with a liquid-carrying rate of 80-85%, and finally dry and bake. 2. a kind of method adopting silica sol to prepare wrinkle-resistant cotton fabric according to claim 1 is characterized in that: the catalyst in the described step (1) is the one in ammonium sulfate, acetic acid; Silicate is silicic acid sodium. 3. A kind of method adopting silica sol to prepare anti-wrinkle cotton fabric according to claim 1, is characterized in that: the drying mode in described step (1) is drying on the heat setting machine, and drying temperature is 80-120 ℃, the drying time is 1-3min. 4. A method for preparing wrinkle-resistant cotton fabrics by using silica sol according to claim 1, characterized in that: the washing method in the step (1) is machine washing at room temperature, and the washing time is 5-30 minutes. 5. a kind of method adopting silica sol to prepare anti-wrinkle cotton fabric according to claim 1 is characterized in that: the composition of the anti-wrinkle finishing solution in the described step (2) comprises: anti-wrinkle finishing agent, catalyst, initiator, strong Protective agent and water; wherein, the anti-wrinkle finishing agent is 3-9% of the mass of the finishing liquid, the initiator is 0-1.5% of the mass of the anti-wrinkle finishing agent, and the molar ratio of the catalyst to the anti-wrinkle finishing agent is 1:2-2:1, The strong protective agent is 0-2% of the quality of the finishing liquid, and the balance is water. 6. a kind of method adopting silica sol to prepare anti-wrinkle cotton fabric according to claim 5 is characterized in that: the anti-wrinkle finishing agent described in step (2) is polycarboxylic acid anti-wrinkle finishing agent; One of sodium phosphate, disodium hydrogen phosphate and sodium dihydrogen phosphate; the initiator is sodium peroxodisulfate or potassium peroxodisulfate; the strong protective agent is triethanolamine. 7. a kind of method adopting silica sol to prepare anti-wrinkle cotton fabric according to claim 6, is characterized in that: described polycarboxylic acid class anti-wrinkle finishing agent is maleic acid MA, itaconic acid IA, butane tetracarboxylic acid One or both of BTCA and citric acid CA. 8. A kind of method adopting silica sol to prepare anti-wrinkle cotton fabric according to claim 1, it is characterized in that: the drying method in the described step (2) is drying on a heat setting machine, and the drying temperature is 80-100 ℃, the drying time is 3-10min. 9. A method for preparing anti-wrinkle cotton fabric by using silica sol according to claim 1, characterized in that: the baking temperature in the step (2) is 160-180° C., and the baking time is 1-3 minutes.