CN113373691B - A kind of preparation method and application of cationic modifier TCTAC - Google Patents

Abstract

A preparation method and application of a cationic modifier TCTAC relate to the technical field of crease-resistant and antibacterial finishing of cotton fabrics. Dissolving 2,3-epoxy hydroxypropyl trimethyl ammonium chloride in deionized water, dropwise adding ammonia water, heating, stirring, reacting, and dissolving in deionized water to obtain 1-amino-3-hydroxypropyl trimethyl ammonium chloride aqueous solution; dissolving cyanuric chloride in acetone, dropwise adding 1-amino-3-hydroxypropyl trimethyl ammonium chloride aqueous solution, adjusting the pH value to 6-7 by using sodium carbonate aqueous solution, stirring and reacting until the reaction is finished, and obtaining the cationic modifier TCTAC through salting out, purification and drying. The invention has short synthesis period and high yield, synthesizes a novel cationic modifier, can be used for carrying out anti-wrinkle/antibacterial dual-function treatment on cotton fabrics, and can effectively inhibit relative slippage between fibers, thereby improving the wrinkle recovery capability and obtaining the cotton fabrics with good dry and wet anti-wrinkle performance.

Description

A kind of preparation method and application of cationic modifier TCTAC

technical field

The invention relates to the technical field of anti-wrinkle and antibacterial finishing of cotton fabrics.

Background technique

In this era of rapid social development, with the improvement of textile products, people are not limited to the comfort of wearing, but also pay attention to the improvement of its functions, such as: UV-resistant fabrics, quick-drying fabrics, hydrophobic fabrics, flame-retardant fabrics Wait. On the one hand, with the process of globalization becoming more and more together and the world interacting more frequently, while the material and spiritual civilization is developing rapidly, it has caused some unnecessary troubles to people, such as the threat of disease caused by the spread of bacteria, etc. . In people's daily life, it is unavoidable to come into contact with various bacteria. Once the bacteria are under suitable conditions, they can multiply and reproduce quickly, and spread everywhere with the flow of people, which seriously endangers Cooperating with human life and health. And textiles provide a certain living environment for the spread and breeding of bacteria, so it is necessary to develop efficient antibacterial finishing agents to endow fabrics with certain antibacterial properties. Cotton fabric is a natural fiber with excellent moisture absorption and moisture permeability. Cotton clothing is comfortable and soft to wear, and is not easy to generate static electricity. The global consumption of cotton fabrics ranks first among all textiles, but cotton fabrics have some defects, such as poor wrinkle resistance, easy to wrinkle during normal wearing, and troublesome ironing after cleaning. Reduced its effectiveness. Therefore, we need anti-wrinkle finishing of cotton fabrics.

In recent years, the research of compounding antibacterial and anti-wrinkle functions into cotton fabrics is being carried out in full swing, which meets the market's requirements for the wearability of textiles. The multifunctional finishing of cotton fabrics is the technology of compounding two or more functions in textiles. The multifunctional finishing of fabrics makes textiles develop towards high-grade and deep layers, which can not only overcome the shortcomings of textiles itself but also endow textiles with multifunctionality.

At present, the common preparation method of antibacterial/anti-wrinkle cotton fabric is to compound anti-bacterial agent and anti-wrinkle agent or blend polycarboxylic acid and chitosan, and prepare anti-bacterial and anti-wrinkle dual-function cotton fabric by dipping or pad-baking. fabric. For example, Wang Jiangang, Gan Yingjin and others used chitosan and polycarboxylic acid to compound cotton fabrics to give them better anti-wrinkle and antibacterial properties. He Yuan and others finished the antibacterial agent AGP and polybasic carboxylic acid BTCA on the cotton fabric through the conventional process of rolling and baking, and obtained the antibacterial and anti-wrinkle cotton fabric. Ji Xuehai and others finished various antibacterial agents and BTCA respectively on cotton fabrics, and adopted the two-bath and two-step finishing process to improve the antibacterial rate of the fabrics. In recent years, researches on the anti-wrinkle finishing of cotton fabrics using ionic cross-linking technology emerge in an endless stream. However, the application research on the connection of cotton fabric ion crosslinking technology with antibacterial finishing is very scarce, and the research on the combination of haloamine compounds and anti-wrinkle agents to prepare anti-bacterial and anti-wrinkle cotton fabrics is rare at home and abroad.

Contents of the invention

In order to overcome the deficiencies in the prior art, the first purpose of the present invention is to propose a preparation method of a cationic modifier TCTAC to provide a treatment for producing anti-wrinkle/antibacterial dual-functional cotton fabrics.

Technical scheme of the present invention comprises the steps:

1) Dissolve 2,3-epoxypropyltrimethylammonium chloride in deionized water and add ammonia water dropwise, heat and stir. After the reaction, 3-amino-2-hydroxypropyltrimethylammonium chloride is obtained ; 3-amino-2-hydroxypropyltrimethylammonium chloride is dissolved in deionized water to form 3-amino-2-hydroxypropyltrimethylammonium chloride aqueous solution;

2) Dissolve cyanuric chloride in acetone at 0°C and add dropwise 3-amino-2-hydroxypropyltrimethylammonium chloride aqueous solution, use sodium carbonate aqueous solution to adjust the pH value to 6-7, and stir the reaction until After finishing, the cationic modifier TCTAC is obtained by salting out, purifying and drying.

The invention has short synthesis period and high yield, and synthesizes a novel cationic modifier, which can be used for anti-wrinkle/antibacterial dual-functional treatment on cotton fabrics.

Another object of the present invention is the application of the cationic modifier TCTAC in the anti-wrinkle and antibacterial finishing of cotton fabrics.

In the present invention, by finishing gray cloth, cationic modification and haloamine are combined, and the crosslinking agent BPTCD is used to carry out anti-wrinkle finishing of cotton fabric, because the molecule of crosslinking agent BPTCD contains a plurality of active groups that can chemically bond with fibers , can generate a three-dimensional network structure in the fabric, effectively inhibit the relative slippage between fibers, thereby improving the wrinkle recovery ability, so the cotton fabric with excellent wrinkle resistance in dry and wet states can be obtained.

The specific arrangement includes the following steps:

1) Dissolve the cationic modifier TCTAC and sodium hydroxide in deionized water to make the first impregnating solution, and use the two dipping and two rolling process to treat the cotton gray cloth, then pre-baking, first baking, washing and drying , get I/Cotton;

2) Dissolve 3,3,4,4-benzophenone tetracarboxylic dianhydride and sodium hypophosphite in deionized water at 80°C to make the second impregnation solution, and use the process of double dipping and rolling to make I/Cotton After treatment, pre-baking, second-baking, washing, and drying to obtain ICL/Cotton;

3) Use an acid to adjust the pH of the sodium hypochlorite aqueous solution to neutral, soak the ICL/Cotton in it, take it out, then wash and dry it to obtain Cl-ICL/Cotton.

The beneficial effects of the present invention are:

TCTAC, a triazine cationic modifier prepared in the present invention, can cationicly modify the cotton fabric so that its surface is positively charged. The polycarboxylic acid anti-wrinkle finishing agent 3,3,4,4-benzophenone tetracarboxylic dianhydride (BPTCD) is finished on the surface through the rolling and baking process, so that the surface of the fabric has a large number of carboxyl anions, which form with cations Ionic cross-linking and chlorination with sodium hypochlorite resulted in an antibacterial/wrinkle-resistant composite functional cotton fabric. The process conditions were optimized, and the mechanical properties, stability and antibacterial properties of the finished fabrics were tested. Improved UV resistance and wet wrinkle recovery.

Furthermore, with the increase of the amount of cationic modifier TCTAC, the dry wrinkle recovery angle and the retention rate of warp breaking strength increased continuously. As the amount of cationic modifier TCTAC increases, the carboxyl groups on BPTCD will generate more ionic crosslinks with the cationic modifier TCTAC, which enhances the degree of crosslinking between fibers and increases the wrinkle recovery angle. The increase of positive charges carried by cotton fabric is beneficial to attract negatively charged ions, which is beneficial to the esterification reaction between BPTCD and cellulose fibers, so the wrinkle recovery angle increases. However, if the amount of cationic modifier TCTAC is too high, the amount of caustic soda will also increase, the strength loss of the fabric will continue to increase, and the whiteness will gradually decrease. Therefore, the choice of cationic modifier TCTAC is 50 g/L.

Furthermore, with the increase of the amount of BPTCD, the wrinkle recovery angle in the dry state increases continuously, and the retention rate of the fracture strength in the longitudinal direction decreases gradually. However, when the amount of BPTCD is 50g/L, the retention rate of the meridional breaking strength is 75%, and the wrinkle recovery angle is increased by 85°, which has achieved excellent wrinkle resistance. As the amount of BPTCD increases, the amount of SHP is also increasing. SHP is expensive and will cause a lot of phosphorus pollution, which is not environmentally friendly. Therefore, the choice of BPTCD is 50g/L.

Furthermore, the length of the baking time directly affects the degree of crosslinking reaction between the finishing agent and the cellulose fiber. The longer the baking time, the higher the wrinkle recovery angle of the fabric, and the easier and more complete the esterification reaction. However, there are disadvantages such as the hardening of the fabric, poor whiteness and decreased strength, which affect the wearability of the fabric. Therefore, the baking time is selected as 150s.

Furthermore, with the increase of baking temperature, the wrinkle recovery angle increases accordingly. This is because within a certain temperature range, the higher the temperature, the higher the degree of esterification reaction between cotton fiber and BPTCD. However, if the baking temperature is too high, the glucose group on the cotton fiber will be dehydrated, the carboxyl group will increase, the degree of polymerization will decrease, and the loss of strength will increase, that is, the retention rate of warp fracture strength will gradually decrease. Therefore, the baking temperature is selected to be 160°C.

Description of drawings

Figure 1 is the SEM image of Cotton.

Figure 2 is the infrared spectrogram of the cationic modifier TCTAC.

Figure 3 is the H NMR spectrum of the cationic modifier TCTAC.

Figure 4 is the SEM image of I/Cotton.

Figure 5 is the infrared spectrum of Cotton, Cotton/IC and Cl-Cotton/ICL.

Figure 6 is the SEM image of ICL/Cotton.

Fig. 7 is the XRD analysis figure of ICL/Cotton, I/Cotton and Cotton.

Figure 8 is the SEM image of Cl-ICL/Cotton.

Fig. 9 is the TG thermal stability analysis chart of Cotton, Cl-ICL/Cotton, I/Cotton and ICL/Cotton.

Figure 10 UV resistance of Cl-ICL/Cotton.

Figure 11 Washing stability of Cl-ICL/Cotton wet and dry wrinkle recovery angle.

Fig. 12 Water washing stability of chlorine content of Cl-ICL/Cotton.

Detailed ways

1. Preparation of samples:

Example 1:

1) Preparation of cationic modifier TCTAC:

1. Weigh 0.01 mol of 2,3-epoxypropyltrimethylammonium chloride (EPTAC) and 20 mL of deionized water to dissolve in a round bottom flask and stir for 20 min, then pour into the round bottom flask with a constant pressure funnel Slowly add 0.01 mol ammonia solution dropwise and stir at 80°C for 12 h. After the reaction, filter with suction to obtain 3-amino-2-hydroxypropyltrimethylammonium chloride (ACTAC).

2. Weigh 0.01 mol of cyanuric chloride and 40 mL of acetone to dissolve in a three-neck flask and stir for 20 min. Dissolve 0.01 mol of 3-amino-2-hydroxypropyltrimethylammonium chloride in 20 mL of deionized water and constant The pressure funnel was slowly dropped into the three-necked flask, the temperature of the system was maintained at 0 °C, and the pH value of the entire reaction system was adjusted to 6-7 with a sodium carbonate solution with a concentration of 0.1 g/L, and the stirring was continued for 3 h. After the reaction, the solid product was purified by salting out, and placed in a vacuum oven at 45 °C for 24 h to obtain the cationic modifier TCTAC, with a calculated yield of 90% after weighing.

As can be seen from Figure ² , the absorption peak at ³⁴³³ cm ^-1 is due to the absorption peaks caused by NH vibration; The vibrations of CH3 and -CH2 cause the stretching vibration absorption peak, the stretching vibration peak of the quaternary ammonium salt at 1488 cm ^-1 , the overlapping absorption peak of the skeleton vibration of the triazine ring near 1366 cm ^-1 and 1674 cm ^-1 , ^and 1074 cm -1 Near ¹ is the stretching vibration peak of CH, and 777 cm ^-1 is also one of the absorption peaks of the triazine ring.

As can be seen from Figure 3, 2.97-3.12 ppm is the chemical shift value of the hydrogen atom on -CH3 on the ammonium chloride, 3.38-3.47 ppm is the chemical shift value of the -CH2 hydrogen atom connected to the amino group, and 3.56-3.83 ppm is the chemical shift value of the hydrogen atom linked to the hydroxyl group. The chemical shift value of the connected -CH hydrogen atom, 3.84-4.00 ppm is the chemical shift value of the -CH2 hydrogen atom connected to ammonium chloride, 5.57-5.70 ppm is the chemical shift value of the -OH hydrogen atom, 5.96-6.08 ppm is the chemical shift value of the -OH hydrogen atom Chemical shift values of NH hydrogen atoms.

2) Modification of cotton fabric:

1. Dissolve 5 g of cationic modifier TCTAC and 3.2 g of sodium hydroxide in 100 mL of deionized water, immerse the cotton gray cloth (i.e. raw cotton Cotton) in it, the bath ratio is 1:30, the soaking time is 15 min, two soaking and two rolling , The surplus rate is 100%. Cotton fabrics were pre-baked at 80°C for 3 minutes, and then baked at 100°C for 120 s. After taking them out, the cotton fabrics were washed with water and pickled to remove unreacted reagents (acid in pickling), and finally dried at a constant temperature of 45°C. Dry in the oven to get I/Cotton with positive charge on the surface.

It can be seen from Figure 1 that the surface of raw cotton is relatively smooth and basically free of impurities. It can be seen from Figure 4 that the surface of I/Cotton is covered with a film-like substance due to the grafted cationic modifier.

2. Dissolve 5.0 g of 3,3,4,4-benzophenone tetracarboxylic dianhydride (BPTCD) and 2.9 g of sodium hypophosphite (SHP) in 100 mL of hot water at 80°C, and then The I/Cotton obtained by chemical treatment was immersed in it, the bath ratio was 1:30, the immersion time was 15 min, two dipping and two rolling, and the scrapping rate was 100%. Cotton fabrics were prebaked at 80°C for 3 min, then baked at 160°C for 120 s, taken out, washed with water, soaped to remove unreacted reagents, and finally dried in a constant temperature oven at 45°C to obtain ICL/Cotton.

As shown in Figure 5, compared with raw cotton (a), the ionically crosslinked cotton fabric ICL/Cotton (b) has the carbonyl bending overlapping vibration absorption peak of BPTCD and TCTAC at 1711 cm ^-1 . It indicated that BPTCD and TCTAC were successfully grafted onto cotton fabric.

It can be seen from Figure 6 that due to the occurrence of ionic crosslinking and esterification crosslinking in ICL/Cotton, the surface of the fabric becomes rough and the shape is slightly undulating. It indicates that the samples were successfully prepared and the cotton fiber structure was not damaged.

It can be seen from Figure 7 that the crystallinity of the cotton fabric becomes smaller after ion crosslinking, and the amorphous region begins to increase. In the finishing system of polycarboxylic acid, the finishing agent enters the surface of fiber crystals, making the crystal size smaller, thereby reducing the crystallinity. This proves from the side that the cotton fabric has been cross-linked. Due to its relatively low molecular weight, BPTCD can pass through the gap between cellulose molecules and destroy the hydrogen bonds between molecular chains, thereby reducing the crystallinity of cotton fibers. But in any case, the crystal structure of the cotton fibers remained largely unchanged.

3. Weigh 2 g of sodium hypochlorite aqueous solution with a concentration of 6wt%, dissolve it in 18 g of deionized water, adjust the pH to neutral with dilute sulfuric acid with a concentration of 20wt%, put the dried ICL/Cotton into it and soak for 1 hour, then take it out , washed with a large amount of deionized water and dried in a vacuum oven at 45°C to obtain Cl-ICL/Cotton.

It can be seen from Figure 5 that, compared with ICL/Cotton, Cl-ICL/Cotton, the carbonyl absorption characteristic peak of the cotton fabric after finishing moved from 1711 cm ^-1 to 1717 cm ^-1 , and the carbonyl absorption on the cotton fabric after sodium hypochlorite chlorination The NH bond becomes an N-Cl bond, and the electron-withdrawing effect of the chloride ion causes the characteristic peak to shift to a higher wave. The above results all proved that the grafting of the samples was successful.

It can be seen from Figure 8 that due to the occurrence of ionic crosslinking and esterification crosslinking in Cl-ICL/Cotton, the surface of the fabric becomes rough and the morphology is slightly undulating. It indicates that the samples were successfully prepared and the cotton fiber structure was not damaged.

The thermal stability of the samples was evaluated by TG, and the curves are shown in Figure 9. The raw cotton fabric curve shows a major weight loss area, the weight loss in the temperature range of 380-500 °C is 80.3%, the initial decomposition temperature is 283 °C, and the carbon remaining rate is 3.9%, which is due to the part of the main chain Decomposition and combustion of the carbonaceous skeleton. The weight loss of I/Cotton is 80.4%, the carbon remaining rate is 6.3%, and the initial decomposition temperature is 249 ^o C. The weight loss of ICL/Cotton is 66.4%, the remaining carbon rate is 6.3%, and the initial decomposition temperature is 252 ^o C. The weight loss of Cl-ICL/Cotton is 67.5%, the remaining carbon rate is 6.1%, and the initial decomposition temperature is 251℃. Compared with raw cotton fabrics, the thermal stability of the finished fabrics was improved due to the covalent crosslinks formed by BPTCD and cotton fabrics and the ionic crosslinks formed by BPTCD and TCTAC.

Comparative example 1:

Dissolve a certain amount of 3,3,4,4-benzophenonetetracarboxylic dianhydride (BPTCD) and sodium hypophosphite (SHP) in 100 mL of hot water at 80°C, and then dissolve raw cotton that has not been cationized (Cotton) was immersed in it, the bath ratio was 1:30, the dipping time was 15 min, two dipping and two rolling, and the scrapping rate was 100%. Cotton fabrics were prebaked at 80 °C for 3 min, then baked at 160 °C for 120 s, taken out, washed with water, soaped to remove unreacted reagents, and finally dried in a constant temperature oven at 45 °C to obtain NICL/Cotton.

Comparative example 2:

Under the same reaction conditions, cotton fabrics were treated with BTCA to obtain BTCA/Cotton.

Dissolve 60 g/L BTCA and 60 g/L sodium hypophosphite (SHP) in 100 mL of deionized water, and then immerse untreated cotton gray cloth (ie raw cotton) in it, bath ratio 1:30, immersion time 15 min, two dipping and two rolling, the excess rolling rate is 100%. Cotton fabrics were pre-baked at 80 ^° C for 3 min, then baked at 170 °C for 180 s, taken out, washed with water, soaped to remove unreacted reagents, and finally dried in a constant temperature oven at 45 °C to obtain BTCA/Cotton.

2. Performance test:

1. Test its various properties, and the test results are shown in the table.

Comparing Cl-NICL/Cotton and Cl-ICL/Cotton, it can be concluded that the wrinkle resistance of ionically crosslinked cotton fabrics is improved compared with that of non-ionically crosslinked cotton fabrics, and the wrinkle recovery angle in the dry state is increased by 24°, and the wrinkle recovery angle in the wet state is increased. 37°, this is because the ionic cross-linking occurs between the wet cellulose molecular chains, which enhances the binding force between the fiber molecular chains and improves the crystallization state. Chlorine content, UPF and stiffness increased slightly, while whiteness decreased. The anti-wrinkle performance of the fabric after ion cross-linking is comparable to that of BTCA. According to the wrinkle recovery angle (WRA) of durable press textiles is generally 250°～300°, DP grade ≥ 3.5, and tensile strength loss ≤ 40%, it can be found that Cl-ICL/Cotton basically meets the basic requirements of durable press textiles , and the force loss is small.

2. Antibacterial test analysis:

Under the optimal process conditions, the antibacterial properties of unchlorinated and chlorinated cotton fabrics were determined. Among them, the chlorine content of chlorinated fabrics is 0.27%.

Note: ^a The concentration of Staphylococcus aureus is 8.40×10 ⁵ CFU/sample; ^b The concentration of Escherichia coli O157:H7 is 1.00×10 ⁶ CFU/sample

Theoretically, the higher the chlorine content, the greater the contact probability between active chlorine and bacteria, which can effectively improve the antibacterial effect of the substrate.

Staphylococcus aureus and Escherichia coli were used for antibacterial tests, wherein the concentration of Staphylococcus aureus inoculated in each group of samples was 8.40×10 ⁵ CFU/sample; the concentration of Escherichia coli O157:H7 was 1.00×10 ⁶ CFU/sample. The non-chlorinated sample had a small reduction in the number of Staphylococcus aureus and E. coli within 30 minutes, because the bacteria adhered to the surface of the test sample instead of killing the bacteria. Chlorinated samples can kill 100% of Staphylococcus aureus within 5 minutes and 100% of Escherichia coli within 10 minutes. This is because the oxidative properties of the N-Cl bonds on the fabric after finishing inactivate microorganisms. The above conclusions show that the composite finishing cotton fabric has excellent antibacterial performance and fast sterilization speed.

3. UV stability test:

Chlorine content can be regenerated by rechlorination, but cannot be regenerated due to some irrecoverable chlorine content. Because BPTCD is a derivative of benzophenone ^[63] , it can absorb the energy of ultraviolet light and convert it into other energy. It can be seen from Figure 10 that the addition of BPTCD can significantly improve the UV stability of the halamine antibacterial agent. The chlorine content can still reach 0.08% after 24 hours of irradiation, and the chlorine content can recover to 79% after re-chlorination. The wrinkle resistance of cotton fabrics decreased slightly under ultraviolet light, and the energy of ultraviolet rays aged and broke some chemical bonds formed between cotton fibers and BPTCD, and the formed ionic bonds were broken. Comparing the dry and wet wrinkle recovery angle of Cl-ICL/Cotton 223° and the dry and wet wrinkle recovery angle of Cl-NICL/Cotton 225° after 24 hours, it is concluded that BPTCD is a derivative of benzophenone and absorbs part of the ultraviolet rays Energy, chemical and ionic bonds formed by crosslinking are protected without causing massive breakage.

4. Washing resistance test:

After ion cross-linking and chlorination, cotton fabric has antibacterial/anti-wrinkle composite functions. The chlorine content is an important indicator of the antibacterial properties of cotton fabrics treated with haloamine compounds. Important indicators. When the cotton fabric modified by haloamine compounds is washed, the chlorine content will decrease with the hydrolysis of the N-Cl bond, and the cotton fabric cross-linked with the polycarboxylic acid anti-wrinkle agent will be accompanied by the hydrolysis of the ether bond, resulting in a decrease in the wrinkle recovery angle. decline.

It can be seen from Figure 11 that after 1, 5, and 10 times of water washing, the dry and wet wrinkle recovery angles of Cl-ICL/Cotton decreased slightly, and the dry and wet wrinkle recovery angles of Cl-NICL/Cotton were 225.8 ° and 191.5 °, the comparison shows that the ionic bonds formed by ionic cross-linking still partially exist after washing. As can be seen in Figure 12, after 10 times of water washing, the loss of chlorine content is 33.3%, and the recovery rate of chlorine content is 74%. This is partly due to the hydrolysis of the N-Cl bond, which can be recovered after rechlorination. On the other hand, it is due to the hydrolysis of the ester bond formed between BPTCD and cotton fiber, and the hydrolysis of the ester bond causes the permanent loss of chlorine content and cannot be recovered. After 25 times of water washing, the wrinkle recovery angle of Cl-ICL/Cotton in wet and dry state decreased slightly. This is because the ionic bond formed by ionic crosslinking was destroyed after repeated washing, and the ether bond formed by BPTCD and cotton fiber caused by hydrolysis. The loss rate of chlorine content was 63%, and the recovery rate of chlorine content was 66%. After rechlorination, the chlorine content of cotton fabric can still reach 0.20%, and it still has good bactericidal performance.

Claims (4)

1. the application of a cationic modifier TCTAC in the anti-wrinkle and antibacterial finishing of cotton fabrics, is characterized in that, comprises the following steps: 1) Dissolve the cationic modifier TCTAC and sodium hydroxide in deionized water to make the first impregnating solution, and use the two dipping and two rolling process to treat the cotton gray cloth, then pre-baking, first baking, washing and drying , get I/Cotton; 2) Dissolve 3,3,4,4-benzophenone tetracarboxylic dianhydride and sodium hypophosphite in deionized water at 80°C to make the second impregnation solution, and use the process of double dipping and rolling to make I/Cotton After treatment, pre-baking, second-baking, washing, and drying to obtain ICL/Cotton; 3) Use acid to adjust the pH of the sodium hypochlorite aqueous solution to neutral, soak the ICL/Cotton in it and take it out, then wash and dry to obtain Cl-ICL/Cotton; The preparation method of described cationic modifier TCTAC comprises the following steps: 1) Dissolve 2,3-epoxypropyltrimethylammonium chloride in deionized water and add ammonia water dropwise, heat and stir. After the reaction, 3-amino-2-hydroxypropyltrimethylammonium chloride is obtained ; 3-amino-2-hydroxypropyltrimethylammonium chloride is dissolved in deionized water to form 3-amino-2-hydroxypropyltrimethylammonium chloride aqueous solution; 2) Dissolve cyanuric chloride in acetone at 0°C and add dropwise 3-amino-2-hydroxypropyltrimethylammonium chloride aqueous solution, use sodium carbonate aqueous solution to adjust the pH value to 6-7, and stir the reaction until After finishing, the cationic modifier TCTAC is obtained by salting out, purifying and drying. 2. The application according to claim 1, characterized in that the concentration of the cationic modifier TCTAC in the first immersion liquid is 50 g/L. 3. The application according to claim 1, characterized in that the concentration of the 3,3,4,4-benzophenonetetracarboxylic dianhydride in the second dipping solution is 50 g/L. 4. The application according to claim 1, characterized in that, the temperature of the second baking is 160° C., and the time of the second baking is 150 s.

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