CN115162007B - Self-crosslinking type antibacterial ultraviolet-proof finishing agent for textiles and preparation method thereof - Google Patents

Abstract

The invention discloses a self-crosslinking type antibacterial ultraviolet-proof finishing agent for textiles and a preparation method thereof, and belongs to the technical field of functional textiles. According to the invention, firstly, through condensation reaction between carboxyl and amino, amino on polylysine and carboxyl on levodopa are utilized to graft the levodopa on the polylysine, so as to obtain a polylysine solution containing dopa side groups; then adding silver nitrate into the solution of the polylysine containing the dopa side group, generating nano silver on the polylysine containing the dopa side group in situ through the reducibility and the adhesiveness of the dopa group, and firmly combining the nano silver with the nano silver to obtain the antibacterial ultraviolet-proof finishing agent of the polylysine/nano silver complex containing the dopa side group; and finally, spontaneously forming a firm network-shaped adhesive coating on the surface of the fabric by utilizing an antibacterial ultraviolet-proof finishing agent containing the polylysine/nano silver complex with the dopa side group, wherein the polylysine and the nano silver jointly endow the fabric with excellent antibacterial performance, and the benzene ring structure in the dopa structure endows the fabric with ultraviolet-proof performance.

Description

A self-crosslinking antibacterial and anti-UV finishing agent for textiles and its preparation method

Technical field

The invention relates to a self-crosslinking antibacterial and anti-ultraviolet finishing agent for textiles and a preparation method thereof, and belongs to the technical field of functional textiles.

Background technique

Textiles are closely related to people's lives and are one of the direct or indirect transmission media of microorganisms. Since the human body has the temperature, food, and living environment required for the growth and reproduction of microorganisms, under suitable conditions, some microorganisms will multiply in large quantities. In severe cases, they may cause certain diseases or cause abnormal skin irritation and discomfort. In order to prevent such problems from occurring, people began to carry out antibacterial finishing of textiles. Antibacterial finishing usually uses antibacterial processing aids to treat fiber products. It can not only inhibit the deterioration of textiles under the action of microorganisms, but also ensure that when ingested, it inhibits the reproduction of microorganisms that live on sweat and dirt as nutrient sources. .

Commonly used types of antibacterial agents include inorganic, organic and natural products; among them, inorganic antibacterial agents include antibacterial zeolites, silver silicate, phosphates, etc.; organic antibacterial agents include organosilicon quaternary ammonium salts, Chloro-m-cresol, copper polyacrylate, etc.; natural product antibacterial agents include some plant extracts such as mugwort, aloe vera, licorice, tea, etc.; animal extracts: chitin, chitosan, insect antibacterial protein, etc. .

At present, the methods for antibacterial modification of textiles mainly include blend spinning, coating, graft modification, etc. The blend spinning method refers to adding antibacterial agents during fiber spinning, mixing them with the spinning solution, and spinning to obtain antibacterial fibers or filaments. The coating method is to finish the fabric after coating, and fix the antibacterial agent on the surface of the fabric to give it antibacterial properties. Graft modification method is a processing method that grafts antibacterial substances onto the surface of fabrics through chemical reactions. It can be seen from these methods that antibacterial modification of textiles is mostly carried out in textile processing links, such as spinning, dyeing, finishing and other processes. There is a lack of textile antibacterial agents for consumers to use conveniently.

Therefore, as people's demand for antibacterial textiles increases, textile antibacterial agents that are easy to use and highly effective in inhibiting bacteria have good application prospects.

Contents of the invention

[technical problem]

The actual technical problem to be solved by the present invention is to provide a self-crosslinking antibacterial and anti-UV finishing agent for textiles. This finishing agent does not require the use of other chemical reagents and can be self-crosslinked and fixed on the surface of textiles through simple dipping or spraying. Textiles have excellent antibacterial and anti-UV properties and retain excellent antibacterial and anti-UV properties after repeated washing.

[Technical solutions]

In order to solve the above problems, the present invention provides a method for preparing a self-crosslinking textile antibacterial and anti-UV finishing agent. The method is to first use the amino group and the amino group on polylysine through the condensation reaction between the carboxyl group and the amino group. The carboxyl group on levodopa is grafted to polylysine to obtain a polylysine solution containing dopa side groups; then silver nitrate is added to the polylysine solution containing dopa side groups, and the polylysine is passed through the polylysine solution. Using the reducing and adhesion properties of the dopa group, nanosilver is generated in situ on polylysine containing dopa side groups and is firmly combined with it to obtain the antibacterial antibacterial agent of the polylysine/nanosilver complex containing dopa side groups. and anti-UV finishing agent; finally, the spontaneous Schiff base or Michael addition reaction between the quinone formed by the oxidation of the dopa group and the amino group of polylysine is used to form a polylysine/nano-silver complex containing dopa side groups. Antibacterial and anti-UV finishing agents can spontaneously form a strong network-like adhesive coating on the surface of fabrics. Polylysine and nanosilver together give the fabric excellent antibacterial properties, and the benzene ring structure in the DOPA structure gives the fabric anti-UV properties.

The first object of the present invention is to provide a method for preparing a self-crosslinking antibacterial and anti-UV finishing agent for textiles, which includes the following steps:

(1) Preparation of polylysine solution containing dopa side groups

Add levodopa and carbodiimide hydrochloride to the polylysine solution to perform a condensation reaction. Through the reaction of the amino group on the polylysine and the carboxyl group on the levodopa, on the polylysine macromolecular chain Graft levodopa to prepare a polylysine solution containing dopa side groups;

(2) Preparation of self-crosslinking antibacterial and anti-UV finishing agent for textiles

Silver nitrate is added to the polylysine solution containing dopa side groups obtained in step (1), and through the reducibility and adhesion of the dopa group, it is reduced in situ on the polylysine containing dopa side groups to generate nanometers. Silver is used to prepare an antibacterial finishing agent containing a dopa side group polylysine/nano silver complex, that is, a self-crosslinking textile antibacterial and anti-UV finishing agent solution.

In one embodiment of the present invention, the concentration of the polylysine solution in step (1) is 5-50g/L; the solvent is phosphate buffer, and the pH range is 5.5-6.5.

In one embodiment of the present invention, the molecular weight of the polylysine described in step (1) is 2000-5000 Da.

In one embodiment of the present invention, the mass ratio of the polylysine and levodopa dosage in step (1) is 5:1 to 30:1.

In one embodiment of the present invention, the concentration of levodopa in the polylysine solution in step (1) is 1 to 10 g/L.

In one embodiment of the present invention, the concentration of carbodiimide hydrochloride in step (1) in the polylysine solution is 0.5-4g/L.

In one embodiment of the present invention, the conditions of the condensation reaction in step (1) are a temperature of 20-40°C and a constant-temperature oscillator for 0.5-12 hours.

In one embodiment of the present invention, the concentration of silver nitrate in step (2) in the polylysine solution containing dopa side groups is 0.1 to 0.5 g/L.

In one embodiment of the present invention, the reaction conditions for the in-situ reduction of polylysine containing dopa side groups to generate silver nanoparticles in step (2) are pH range 8.0-8.5, room temperature (20-30°C ) react for 4 to 10 hours.

In one embodiment of the present invention, the concentration of the self-crosslinking textile antibacterial and anti-UV finishing agent solution in step (2) is 5 to 50 g/L.

The second object of the present invention is the self-crosslinking antibacterial and anti-UV finishing agent for textiles prepared by the method of the present invention.

The third object of the present invention is to provide a method for preparing antibacterial and anti-UV dual-functional fabrics using the self-crosslinking antibacterial and anti-UV finishing agent for textiles of the present invention. The method is to use a dipping method or a spraying method to make the self- The cross-linked textile antibacterial and anti-UV finishing agent solution is self-crosslinked and deposited on the surface of the fabric to obtain an antibacterial and anti-UV dual-functional fabric.

In one embodiment of the present invention, the impregnation method specifically includes;

The fabric is immersed in a self-crosslinking textile antibacterial and anti-UV finishing agent solution. The finishing agent is spontaneously cross-linked and deposited on the surface of the fabric. After the impregnation is completed, it is washed and dried to obtain an antibacterial and anti-UV dual-functional fabric; wherein, the fabric and self-crosslinking The mass ratio of the textile antibacterial and anti-UV finishing agent solution is 1:5~1:50, the impregnation temperature is 20~60℃, the pH is 8.0~8.5, and the impregnation time is 1~60 minutes; after the impregnation is completed, wash it with water and dry it at room temperature or Drying at 60~100℃.

In one embodiment of the present invention, the spraying method is specifically:

The self-crosslinking textile antibacterial and anti-UV finishing agent solution is sprayed on the surface of the fabric, and the finishing agent is spontaneously cross-linked and deposited on the surface of the fabric, and dried to obtain an antibacterial and anti-UV dual-functional fabric; wherein, the mass ratio of the finishing agent solution to the fabric is 1: 10～1:100, after spraying, dry at room temperature or 60～100℃.

In one embodiment of the invention, the fabrics include woven fabrics, knitted fabrics, fillers, non-woven fabrics, clothing, clothing accessories, and home textiles made of cotton, linen, mulberry silk, wool, polyester, and nylon. , decorations and medical and sanitary products.

The fourth object of the present invention is the antibacterial and anti-UV dual-functional fabric prepared by the method of the present invention.

The fifth object of the present invention is to provide an antibacterial and anti-UV finishing method for fabrics, which method uses the self-crosslinking antibacterial and anti-UV finishing agent for textiles of the present invention to modify and finish the fabric.

The sixth object of the present invention is the application of the self-crosslinking antibacterial and anti-UV finishing agent for textiles and antibacterial and anti-UV dual-functional fabrics in clothing textiles, home textiles, decorations and medical and sanitary products.

[beneficial effect]

In the present invention, the polylysine side groups are modified, the dopa side groups are introduced, so that the polylysine has adhesion and reducing properties, and then the silver nitrate is reduced in situ by the polylysine to form a polylysine containing dopa side groups. Lysine/nano-silver complex antibacterial and anti-UV finishing agent can be used to impart antibacterial and anti-UV effects to textiles by dipping or spraying the finishing agent.

Compared with traditional antibacterial and anti-UV finishing methods of textiles such as adding functional finishing agents, coatings and graft modifications during spinning, the present invention has the following advantages:

(1) The preparation process of the antibacterial and anti-UV finishing agent is simple and the conditions are mild: in the preparation process of the antibacterial and anti-UV finishing agent containing dopa side group polylysine/nano-silver complex, the main reagents are polylysine, levodopa, The reaction of carbodiimide hydrochloride and silver nitrate is carried out in an aqueous solution. The operation is simple and does not require a high-temperature and high-pressure reactor. The reaction pH value is weakly acidic or weakly alkaline. The reaction temperature is 20 to 40°C, and the conditions are mild.

(2) The antibacterial and anti-UV finishing agent is simple to use: the antibacterial and anti-UV finishing agent containing dopa side group polylysine/nano-silver complex is simple to use, by dipping the finishing agent solution, or spraying the finishing agent solution on the fabric surface , drying or drying at room temperature can complete the antibacterial and anti-UV modification of textiles. The use process does not require professional equipment and personnel.

(3) Antibacterial and anti-UV textiles have good fastness: The polylysine/nano-silver composite antibacterial and anti-UV finishing agent containing dopa side groups has self-crosslinking properties. The antibacterial textiles modified by it have good washing fastness. , has a long-lasting antibacterial effect.

(4) The antibacterial and anti-UV finishing agent is safe and environmentally friendly: the present invention does not use adhesives, organic solvents, etc., and no harmful substances to the human body will appear during processing or consumption, thus ensuring the safety and environmental protection of the fabric from the source.

Detailed ways

Preferred embodiments of the present invention are described below. It should be understood that the embodiments are for the purpose of better explaining the present invention and are not intended to limit the present invention.

Test Methods:

1. Antibacterial effect test: Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus were selected as the experimental strains, referring to GB/T20944.3-2008 "Evaluation of Antibacterial Performance of Textiles Part 3: Oscillation Method" To evaluate the antibacterial effect of textiles.

2. Washing fastness test:

Referring to GB/T 12490-2014 "Textiles Color Fastness Test to Household and Commercial Washing Color Fastness", use ECE phosphorus-containing detergent to prepare a soap solution with a mass concentration of 4g/L. Under the A1M operating procedure, the prepared antibacterial After washing the fabric 20 times, its antibacterial effect was tested and its washing fastness was evaluated.

3. UV protection performance test:

Use YG(B)912E fabric UV protection performance tester to test the UPF value of the sample.

4. Breathability and moisture permeability test:

Use the YG461E-III fully automatic fabric air permeability meter to measure the air permeability of the fabric, and express the air permeability of the fabric in terms of air permeability (mm/s);

The moisture permeability test was carried out according to GB/T 12704.1-2009 "Test Methods for Moisture Permeability of Textile Fabrics Part 1: Moisture Absorption Method".

Raw materials used in the examples:

Cotton fabric: pure cotton twill woven fabric, 120g/m ² ;

Polyester fabric: pure polyester woven fabric, 80g/m ² ;

Polylysine: molecular weight 2000~5000Da, purity ≥95%.

Example 1

A method for preparing a self-crosslinking antibacterial and anti-UV finishing agent for textiles, including the following steps:

(1) Preparation of polylysine containing dopa side groups

Use pH 6.5 phosphate buffer to prepare a polylysine solution with a concentration of 20g/L; then add 1g/L levodopa and 1g/L carbodiimide hydrochloride to the polylysine solution. Place the condensation reaction in a constant temperature oscillator at 30°C for 6 hours; prepare a polylysine solution containing dopa side groups;

(2) Preparation of self-crosslinking antibacterial and anti-UV finishing agent for textiles

Add 0.1g/L silver nitrate to the polylysine solution (20g/L) containing dopa side groups obtained in step (1), adjust the pH to 8.5, and treat at room temperature for 5 hours to prepare a polylysine solution containing dopa side groups. Lysine/nano-silver complex antibacterial and anti-UV finishing agent, i.e. self-crosslinking anti-bacterial and anti-UV finishing agent solution for textiles (20g/L).

Example 2

A method for preparing a self-crosslinking antibacterial and anti-UV finishing agent for textiles, including the following steps:

(1) Preparation of polylysine containing dopa side groups

Use phosphate buffer with pH 6.0 to prepare a polylysine solution with a concentration of 50g/L; then add 2g/L levodopa and 3g/L carbodiimide hydrochloride to the polylysine solution. Place the condensation reaction in a constant temperature oscillator at 40°C for 12 hours; prepare a polylysine solution containing dopa side groups;

(2) Preparation of self-crosslinking antibacterial and anti-UV finishing agent for textiles

Add 0.4g/L silver nitrate to the polylysine solution (50g/L) containing dopa side groups obtained in step (1), adjust the pH to 8, and treat at room temperature for 6 hours to prepare a polylysine solution containing dopa side groups. Antibacterial and anti-UV finishing agent solution of lysine/nano-silver complex, that is, self-crosslinking anti-bacterial and anti-UV finishing agent solution for textiles (50g/L).

Example 3

A method of preparing antibacterial and anti-UV dual-functional cotton fabrics using the self-crosslinking anti-bacterial and anti-UV finishing agent for textiles of Example 1, including the following steps:

Add 1 g of cotton fabric to 20 mL of the self-crosslinking textile antibacterial and anti-UV finishing agent solution prepared in Example 1 for impregnation. The impregnation temperature is 30°C, the pH is 8.5, and the impregnation time is 10 minutes. After the impregnation is completed, take it out and wash it at 60°C. After drying, an antibacterial and anti-UV dual-functional cotton fabric is obtained.

Example 4

A method of preparing antibacterial and anti-UV dual-functional cotton fabrics using the self-crosslinking anti-bacterial and anti-UV finishing agent for textiles of Example 1, including the following steps:

Take 0.5 mL of the self-crosslinking textile antibacterial and anti-UV finishing agent solution prepared in Example 1, spray it on the surface of 1 g of cotton fabric, and let it dry naturally to obtain an antibacterial and anti-UV dual-functional cotton fabric.

Example 5

A method for preparing antibacterial and anti-UV dual-functional polyester fabrics using the self-crosslinking textile antibacterial and anti-UV finishing agent of Example 2, including the following steps:

Add 1 g of polyester fabric to 10 mL of the self-crosslinking textile antibacterial and anti-UV finishing agent solution prepared in Example 2 for impregnation. The impregnation temperature is 40°C, the pH is 8.0, and the impregnation time is 5 minutes. After the impregnation is completed, take it out and dry it at room temperature after washing. After drying, the antibacterial and anti-UV dual-functional polyester fabric was obtained.

Example 6

A method of preparing antibacterial and anti-UV dual-functional polyester fabrics using the self-crosslinking textile antibacterial and anti-UV finishing agent of Example 2, including the following steps:

Take 1 mL of the self-crosslinking textile antibacterial and anti-UV finishing agent solution prepared in Example 2, spray it on the surface of 5g polyester fabric, and dry it at 60°C to obtain an antibacterial and anti-UV dual-functional polyester fabric.

Comparative Example 1 omits silver nitrate

A method for preparing antibacterial and anti-UV dual-functional cotton fabric, including the following steps:

(1) Preparation of polylysine containing dopa side groups

Use pH 6.5 phosphate buffer to prepare a polylysine solution with a concentration of 20g/L; then add 1g/L levodopa and 1g/L carbodiimide hydrochloride to the polylysine solution. Place the condensation reaction in a constant temperature oscillator at 30°C for 6 hours; prepare a polylysine solution containing dopa side groups;

(2) Impregnated cotton fabric:

Add 1g of cotton fabric to 20mL of 20g/L polylysine solution containing dopa side groups for impregnation. The impregnation temperature is 30°C, the pH is 8.5, and the impregnation time is 10 minutes. After the impregnation is completed, take it out and dry it at 60°C after washing. After drying, the antibacterial and anti-UV dual-functional cotton fabric was obtained.

Comparative Example 2 omits silver nitrate

A method for preparing antibacterial and anti-UV dual-functional polyester fabric, including the following steps:

(1) Preparation of polylysine containing dopa side groups

Use pH 6.0 phosphate buffer to prepare a polylysine solution with a concentration of 50g/L; then add 2g/L levodopa and 3g/L carbodiimide hydrochloride to the polylysine solution. Place the condensation reaction in a constant temperature oscillator at 40°C for 12 hours; prepare a polylysine solution containing dopa side groups;

(2) Spray polyester fabric:

Take 1 mL of a 50 g/L polylysine solution containing dopa side groups, spray it on the surface of 5 g of polyester fabric, and dry it at 60°C to obtain an antibacterial and anti-UV dual-functional polyester fabric.

Comparative example 3 omits levodopa

The levodopa in Example 1 was omitted, and the others were kept the same as in Example 1 to obtain a textile finishing agent solution; and then the antibacterial and anti-UV dual-functional cotton fabric was prepared according to the method of Example 3.

Comparative example 4 omits levodopa

The levodopa in Example 2 was omitted, and the others were kept the same as in Example 2 to obtain a textile finishing agent solution; and then the antibacterial and anti-UV dual-functional polyester fabric was prepared according to the method of Example 6.

The fabric samples of Examples 3 to 6 and Comparative Examples 1 to 4 were tested for antibacterial and UV protection properties. The results are shown in Table 1.

Table 1

It can be seen from Table 1 that the antibacterial and anti-UV dual-functional fabrics Example 3, Example 4, Example 5, and Example 6 prepared by the method of the present invention all have more than 95% effectiveness against Escherichia coli and Staphylococcus aureus. The antibacterial rate remains above 90% after 20 times of washing, and has good washing fastness. In addition, it can be seen that the self-crosslinking antibacterial and anti-UV finishing agent for textiles of the present invention adopts the dipping method and the spraying method. Good antibacterial effects can be obtained by treating the fabrics; the antibacterial rates of Comparative Examples 1 and 2 are both lower than those of the Examples, indicating that the antibacterial performance of the polylysine solution containing dopa side groups is weaker than that of the polylysine solution containing dopa side groups. The lysine/nano-silver complex solution shows that the in-situ generation and binding of nano-silver on polylysine containing dopa side groups is the key to the efficient antibacterial effect of the antibacterial agent of the present invention; Comparative Example 3 and Comparative Example 4 are effective against E. coli and Staphylococcus aureus, showing a certain antibacterial activity. However, after 20 times of washing, the antibacterial rate of the fabric was reduced to 60% to 70%, indicating that the polyester without dopa side groups The antibacterial agent obtained from lysine has poor binding fastness to the fabric surface, indicating that the dopa side group modification of polylysine makes it have self-crosslinking properties, making the antibacterial and anti-UV finishing agent of the present invention good for washing. The key to fastness.

In addition, from the UV protection performance test results in Table 1, it can be seen that the UPF values of Examples 3, 4, 5, and 6 are all greater than 50, and they are still greater than 50 after washing 20 times, indicating that Examples 3 to 6 The dual-functional fabric has good UV protection and wash fastness. The UPF values of Comparative Example 1 and Comparative Example 2 are greater than 50, indicating that the UV protection performance of the fabric has nothing to do with nanosilver. The UPF value of Comparative Example 3 is 8, and the UPF value of Comparative Example 4 is 22, indicating that the introduction of a dopa group into the polylysine structure is the key to the anti-ultraviolet performance of the finishing agent.

The air and moisture permeability of unmodified cotton fabrics, polyester fabrics and Examples 3, 4, 5 and 6 were tested. The results are shown in Table 2.

Table 2

It can be seen from Table 2 that compared with unmodified cotton fabrics and unmodified polyester fabrics, the air permeability of Examples 3, 4, 5 and 6 has not changed, indicating that the finishing agent prepared by the present invention and The finishing method does not block the pores in the fabric and does not affect the breathability of the fabric. In addition, it can be seen from the moisture permeability results of Examples 5 and 6 that compared with unmodified polyester fabrics, the moisture permeability of polyester fabrics is greatly improved after being modified by the antibacterial and anti-UV finishing agent prepared in the present invention. This is because the finishing agent contains a large number of hydrophilic amino groups and hydroxyl groups, which gives the hydrophobic polyester fabric good moisture conduction and moisture permeability properties, which is beneficial to improving the wearing comfort of the fabric.

Comparative Example 5 The molecular weight of polylysine is too large

Polylysine (molecular weight 2000-5000 Da) in Example 1 was replaced with polylysine (molecular weight 100000 Da), and other conditions were kept consistent with Example 1 to obtain a textile finishing agent; and then prepared according to the method of Example 3 Antibacterial and UV-resistant dual-function cotton fabric.

The obtained bifunctional cotton fabric was tested for performance, and the test results are as follows:

The bifunctional cotton fabric of Comparative Example 5 has an antibacterial rate of 96% against Escherichia coli and 95% against Staphylococcus aureus. However, the antibacterial rates dropped to 75% and 68% after washing 20 times, indicating that the selection is appropriate. The molecular weight of polylysine is the key to the present invention. The large molecular weight of polylysine is not conducive to the construction of antibacterial and anti-ultraviolet self-crosslinking coatings.

Comparative Example 6: Too little levodopa dosage

The dosage of levodopa in Example 1 was adjusted to 0.5g/L, and other conditions were kept consistent with Example 1 to obtain a textile finishing agent; and then the antibacterial and anti-UV cotton fabric was prepared according to the method of Example 3.

The obtained bifunctional cotton fabric was tested for performance, and the test results are as follows:

The bifunctional cotton fabric of Comparative Example 6 has an antibacterial rate of 85% against E. coli and 88% against Staphylococcus aureus. After washing 20 times, the antibacterial rates dropped to 65% and 60%, indicating that levodopa If the dosage is too low, the antibacterial properties and fastness of the modified fabric will decrease significantly. Selecting an appropriate dosage of levodopa is the key to the present invention. Too little levodopa is not conducive to the in-situ reduction of nanosilver and the formation of a self-crosslinking network antibacterial and anti-ultraviolet coating.

Comparative Example 7 Excessive dosage of levodopa

The dosage of levodopa in Example 1 was adjusted to 20g/L, and other conditions were kept consistent with Example 1 to obtain a textile finishing agent; and then the antibacterial and anti-UV dual-functional cotton fabric was prepared according to the method of Example 3.

The obtained bifunctional cotton fabric was tested for performance, and the test results are as follows:

The bifunctional cotton fabric of Comparative Example 7 has an antibacterial rate of 82% against Escherichia coli and 80% against Staphylococcus aureus. The antibacterial rates after washing 20 times are 75% and 72%, indicating the dosage of levodopa. If too much is used, the antibacterial property of the modified fabric will decrease. This is because levodopa reacts with the amino groups in polylysine, and the amino groups in polylysine are the key antibacterial groups. When a large amount of amino groups are reacted, the polylysine will The antibacterial property of lysine decreases, resulting in a decrease in the antibacterial effect of the finishing agent. Selecting the appropriate dosage of levodopa is the key to the present invention. Too much levodopa will lead to a decrease in the antibacterial properties of polylysine.

Comparative Example 8 uses nanosilver solution

The addition of 0.1g/L silver nitrate in Example 1 was replaced by the addition of 0.1g/L nanosilver (particle size 10-15nm), and other conditions were kept consistent with Example 1 to obtain a textile finishing agent; and then according to the Example Method 3 was used to prepare antibacterial and anti-UV dual-functional cotton fabrics.

The obtained bifunctional cotton fabric was tested for performance, and the test results are as follows:

The bifunctional cotton fabric of Comparative Example 8 has an antibacterial rate of 93% against Escherichia coli and 92% against Staphylococcus aureus. After being washed 20 times, the antibacterial rates are 82% and 75%, indicating that polylysine is The in-situ reduction and binding of nano-silver on the acid molecular chain is the key to the excellent antibacterial properties of the antibacterial agent of the present invention. When adding nanosilver particles directly to antibacterial agents, nanosilver cannot form a strong binding force with polylysine containing dopa side groups, nor can it form a polylysine/nanosilver complex containing dopa side groups, so there are many After the first wash, the weakly bound silver nanoparticles will detach from the fabric, resulting in a significant decline in the antibacterial performance of the fabric after multiple washes.

Although the present invention has been disclosed above in terms of preferred embodiments, they are 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 (10)

1. A method for preparing a self-crosslinking antibacterial and anti-UV finishing agent for textiles, which is characterized in that it includes the following steps: (1) Preparation of polylysine solution containing dopa side groups Add levodopa and carbodiimide hydrochloride to the polylysine solution to perform a condensation reaction. Through the reaction of the amino group on the polylysine and the carboxyl group on the levodopa, on the polylysine macromolecular chain Graft levodopa to prepare a polylysine solution containing dopa side groups; the molecular weight of polylysine is 2000~5000 Da; the concentration of levodopa in the polylysine solution is 1~10 g/ L; the concentration of polylysine solution is 5~50g/L; the solvent is phosphate buffer, pH range is 5.5~6.5; (2) Preparation of self-crosslinking antibacterial and anti-UV finishing agent for textiles Silver nitrate is added to the polylysine solution containing dopa side groups obtained in step (1), and through the reducibility and adhesion of the dopa group, in-situ reduction is performed on the polylysine containing dopa side groups to generate nanoparticles. Silver is used to prepare an antibacterial finishing agent containing a dopa side group polylysine/nano silver complex, that is, a self-crosslinking textile antibacterial and anti-UV finishing agent solution. 2. The method according to claim 1, characterized in that the concentration of carbodiimide hydrochloride in step (1) in the polylysine solution is 0.5~4g/L. 3. The method according to claim 1, characterized in that the concentration of the silver nitrate described in step (2) in the polylysine solution containing dopa side groups is 0.1~0.5 g/L. 4. The self-crosslinking antibacterial and anti-UV finishing agent for textiles prepared by the method of any one of claims 1 to 3. 5. A method for preparing antibacterial and anti-UV dual-functional fabrics using the self-crosslinking antibacterial and anti-UV finishing agent for textiles according to claim 4, characterized in that the method is to use a dipping method or a spraying method to make self-crosslinking The antibacterial and anti-UV finishing agent solution for textiles is self-crosslinked and deposited on the surface of the fabric to obtain an antibacterial and anti-UV dual-functional fabric. 6. The method according to claim 5, characterized in that the impregnation method specifically includes; The fabric is immersed in a self-crosslinking textile antibacterial and anti-UV finishing agent solution. The finishing agent is spontaneously cross-linked and deposited on the surface of the fabric. After the impregnation is completed, it is washed and dried to obtain an antibacterial and anti-UV dual-functional fabric. Among them, the fabric and self-crosslinking The mass ratio of the textile antibacterial and anti-UV finishing agent solution is 1:5~1:50, the impregnation temperature is 20~60℃, the pH is 8.0~8.5, and the impregnation time is 1~60 minutes; after the impregnation is completed, wash it with water and dry it at room temperature or Drying at 60~100℃. 7. The method according to claim 5, characterized in that the spraying method is specifically: The self-crosslinking textile antibacterial and anti-UV finishing agent solution is sprayed on the surface of the fabric, and the finishing agent is spontaneously cross-linked and deposited on the surface of the fabric, and dried to obtain an antibacterial and anti-UV dual-functional fabric; wherein, the mass ratio of the finishing agent solution to the fabric is 1: 10~1:100, dry at room temperature or 60~100℃ after spraying. 8. Antibacterial and anti-UV dual-functional fabric prepared by the method of any one of claims 5 to 7. 9. Application of the self-crosslinking antibacterial and anti-UV finishing agent for textiles according to claim 4 in clothing textiles, home textiles, decorations or medical and sanitary products. 10. Application of the antibacterial and anti-UV dual-functional fabric according to claim 8 in clothing textiles, home textiles, decorations or medical and sanitary products.