High-elastic antibacterial modified nylon fabric and preparation method thereof

Abstract

The present application relates to a kind of high-elastic antibacterial modified nylon fabric and its preparation method, the high-elastic antibacterial modified nylon fabric includes 90-95 weight parts of nylon fabric and 5-10 weight parts of composite modifier;Wherein, the composite modifier includes nano cellulose, amino polyethylene glycol carboxyl and antibacterial agent;The proportion of nano cellulose in the weight of composite modifier is 40-60%;The proportion of amino polyethylene glycol carboxyl in the weight of composite modifier is 20-40%;The proportion of antibacterial agent in the weight of composite modifier is 10-30%.In the composite modifier of the present application, a layer of uniform modified layer is formed on the surface of fiber by nano cellulose and amino polyethylene glycol carboxyl, the elasticity and toughness of fiber are enhanced, and antibacterial agent is added in the modifier, the adsorption of nano cellulose is combined with the sterilization of antibacterial agent, double antibacterial mechanism is formed, the antibacterial performance of fiber is significantly improved, so that it can better meet the high requirements of underwear such as underpants on materials.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of textiles, and particularly relates to a high-elasticity antibacterial modified nylon fabric and a preparation method thereof. BACKGROUND

[0002] Nylon fibers are widely used in the textile industry due to their excellent strength, wear resistance and chemical corrosion resistance. However, the existing nylon fabrics have the disadvantages of insufficient elastic recovery performance and insufficient antibacterial performance, which limits their application in the textile industry, especially in some high-end intimate apparel fields.

[0003] The main reasons for the insufficient elasticity of nylon are as follows: first, the coexistence of hydrophobic methylene and hydrophilic amide groups in the nylon molecular chain leads to uneven distribution of intermolecular interaction force, affecting the elastic recovery ability; second, the stretching, heat treatment and other processes in the spinning and weaving process may cause changes or damage to the internal structure of the fiber, thereby reducing the elasticity; third, the elasticity of nylon depends on the twisting and recovery of amide bonds, but high temperature or long-term light exposure can damage the stability of the molecular chain, leading to the attenuation of elasticity.

[0004] The main reasons for the insufficient antibacterial performance of nylon are as follows: first, the moisture absorption of nylon is lower than that of natural fibers, which is easy to form a humid microenvironment on the surface of the fiber, providing conditions for bacterial reproduction; second, nylon lacks natural antibacterial components and has high surface smoothness, making it difficult to inhibit bacterial adhesion through physical structure; third, nylon is prone to static electricity, which adsorbs dust and microorganisms in the air, indirectly exacerbating bacterial growth; fourth, the molecular structure of nylon has weak binding ability to some antibacterial agents, and the conventional dyeing process may damage the antibacterial treatment effect.

[0005] With the improvement of people's living quality, people have higher requirements for fiber materials in the field of intimate apparel such as underwear. However, the current ordinary nylon fabric has insufficient elasticity, poor antibacterial performance, is easy to breed bacteria leading to odor, affects health and hygiene, and cannot meet the needs of people for comfort and health.

[0006] Therefore, it is an urgent problem for those skilled in the art to develop a modified nylon fabric that has excellent elasticity and long-term antibacterial performance. SUMMARY

[0007] The purpose of the present application is to provide a high-elasticity antibacterial modified nylon fabric and a preparation method thereof, which improves the elastic recovery rate and antibacterial ability of the fiber.

[0008] The purpose of the present application can be achieved by the following technical solutions:

[0009] The high-elasticity antibacterial modified nylon fabric comprises 90-95 parts by weight of nylon fabric and 5-10 parts by weight of a composite modifier; wherein the composite modifier comprises nanocellulose, amino polyethylene glycol carboxyl and an antibacterial agent; the proportion of the nanocellulose in the weight of the composite modifier is 40-60%; the proportion of the amino polyethylene glycol carboxyl in the weight of the composite modifier is 20-40%; and the proportion of the antibacterial agent in the weight of the composite modifier is 10-30%.

[0010] The present application modifies the nylon fabric by using nanocellulose and amino polyethylene glycol carboxyl as a composite modifier, wherein the nylon fabric has an amide group, the nanocellulose serves as a nanofiller and can enhance the orientation degree and crystalline uniformity of the molecular chain of the nylon fabric, thereby improving the elasticity; the amino polyethylene glycol carboxyl has amino and carboxyl groups and a small molecule, which enables it to form a molecular hydrogen bond with the nylon macromolecular chain and construct a three-dimensional crosslinked network, so that the nylon macromolecular chain is in a non-crystalline region state of random entanglement when not under stress, thereby improving the tensile modulus and elastic recovery rate. Due to the physical action of the molecular hydrogen bond, which is reversible, when stretched, these segments are straightened to form elasticity; after the external force is released, the molecular chain is curled again through internal energy to form plasticity. Therefore, the modified nylon fabric of the present application has the effects of elasticity and plasticity, while the existing modified nylon fabric combined by chemical bonds is a chemical action, which is irreversible and the elasticity is easy to fail.

[0011] Preferably, the weight average molecular weight of the nanocellulose is 4000-8000.

[0012] Preferably, the nanocellulose is EMPO-oxidized, carboxylated, carboxymethylated, silane-coupled modified or sulfonated modified nanocellulose, so as to enhance the interfacial bonding force with the nylon.

[0013] Preferably, the mass ratio of the nanocellulose to the amino polyethylene glycol carboxyl is 1-2:1.

[0014] Further, the antibacterial agent is at least one of a nano-silver antibacterial agent, a zinc oxide antibacterial agent, a tea polyphenol quaternary ammonium salt antibacterial agent, a chitosan quaternary ammonium salt antibacterial agent and a chitosan nano-silver antibacterial agent, which is used to inhibit the growth and reproduction of bacteria.

[0015] A preparation method of the high-elasticity antibacterial modified nylon fabric as described above, comprising the following steps:

[0016] S1: dispersing the nanocellulose in deionized water to form a dispersion liquid;

[0017] S2: dispersing the amino polyethylene glycol carboxyl in ethanol and adding an antibacterial agent to form a modified liquid;

[0018] S3: mixing the modified liquid with the dispersion liquid to obtain a solution containing the composite modifier.

[0019] S4: immersing the polyamide fabric in the solution containing the composite modifier to obtain the modified polyamide fabric.

[0020] In the technical solution, the high modulus and high strength characteristics of the nanocellulose can effectively form a rigid-flexible composite structure with the polyamide to enhance the mechanical properties of the fiber, especially the elastic recovery rate. It transmits stress through interfacial hydrogen bonds and physical entanglement between polyamide molecules, increases the complexity of the network structure inside the fiber, inhibits molecular chain slipping, and improves the elastic recovery rate. The porous structure on the surface of the nanocellulose can provide loading sites for the amino polyethylene glycol carboxyl and the antibacterial agent, reduce particle agglomeration, and prolong the release period of the antibacterial agent.

[0021] The polyethylene glycol segment in the amino polyethylene glycol carboxyl provides molecular chain slipping space, realizing the synergy of "rigidity enhancement + flexibility buffering"; the carboxyl enhances the hydrophilicity of the fiber surface, promotes the uniform dispersion of the antibacterial agent, and can interact with the antibacterial agent due to the active functional groups (such as amino and carboxyl) contained therein, forming stable chemical bonding, which helps to improve the adhesion of the antibacterial agent on the fiber surface and prolong the durability of the antibacterial effect.

[0022] The antibacterial agent is physically adsorbed or covalently bonded on the fiber surface, enhancing the binding force and inhibiting bacterial proliferation, thereby obtaining a high-elastic antibacterial modified polyamide fabric.

[0023] Further, the specific preparation method of step S1 is: step S1 further includes the following steps: adjusting the pH of the dispersion liquid to 6-7.

[0024] Specifically, in the above steps, when the pH of the nanocellulose dispersion liquid is 6-7, the groups (such as hydroxyl) on the surface of the nanocellulose are negatively charged, and the amino groups of the amino polyethylene glycol carboxyl are positively charged, which are combined through electrostatic adsorption to load the amino polyethylene glycol carboxyl on the nanocellulose, which is beneficial to the uniform distribution of the nanocellulose and the amino polyethylene glycol carboxyl relative to each other and better elasticity. In addition, pH 6-7 is the stable dispersion range of nanocellulose, avoiding the decrease of loading efficiency due to aggregation.

[0025] Preferably, in step S1, to better avoid agglomeration, 0.5-2% dispersant can be added for dispersion in deionized water. The dispersion operation is ultrasonic dispersion, and the dispersion time is 20-40 minutes.

[0026] The dispersant is at least one of polyoxyethylene ether dispersant, sodium polyacrylate dispersant, silane coupling agent, titanate coupling agent, and sodium dodecyl sulfate.

[0027] Preferably, before the step S4, the polyamide fabric is cleaned with anhydrous ethanol or deionized water to remove surface stains before being added into the solution containing the composite modifier.

[0028] Specifically, the surface stains of the polyamide fabric can be removed more effectively by appropriately increasing the cleaning temperature or using ultrasonic cleaning.

[0029] Specifically, the surface of the polyamide fabric can be treated, such as plasma treatment, to increase the surface active groups, so as to better modify the polyamide fabric.

[0030] Further, in the step S4, the solution is an ethanol-water mixture, and the volume ratio of ethanol to water in the ethanol-water mixture is 1:1-2.

[0031] Further, in the step S4, the temperature condition of the solution is 50-60℃, and the soaking time of the polyamide fabric is 1-4 hours.

[0032] Further, in the step S4, after the polyamide fabric is soaked, it is first subjected to padding with a padding rate of 70-80%, then dried at 70-80℃ for 10-15 minutes, and finally dried at 100-120℃ for 20-25 minutes, to obtain the high-elasticity and antibacterial modified polyamide fabric.

[0033] A textile product comprising the modified polyamide fabric described above or the modified polyamide fabric prepared by the preparation method described above. Preferably, the textile product is an underpants.

[0034] The beneficial effects of the present application are as follows:

[0035] (1) The nanocellulose and the amino polyethylene glycol carboxyl are added in the modifier of the present application, and the nanocellulose and the amino polyethylene glycol carboxyl form a uniform modified layer on the surface of the fiber, which enhances the elasticity and toughness of the fiber. The antibacterial agent is added in the modifier, the adsorption of the nanocellulose and the sterilization of the antibacterial agent are combined to form a double antibacterial mechanism, which significantly improves the antibacterial performance of the fiber, so that it can better meet the high requirements of underpants and other close-fitting clothes on materials.

[0036] (2) The modification method of the present application is simple and easy to implement, and is easy to realize industrial production. The nanocellulose and the amino polyethylene glycol carboxyl used are both environmentally friendly materials, harmless to the human body, and in line with the development trend of modern green textiles. DETAILED DESCRIPTION

[0037] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with the embodiments.

[0038] In the present application, the main raw material: amino polyethylene glycol carboxyl (NH2-PEG-COOH) has a CAS number of 139729-28-5, which is purchased from Xi'an Qiyue Biological Technology Co., Ltd. The nanocellulose is purchased from Jinan Shengquan Group Co., Ltd.

[0039] Example 1

[0040] This example prepares a high-elastic antibacterial modified nylon fabric, which comprises the following steps:

[0041] S1: 5 parts of nanocellulose with a weight average molecular weight of 6000 are ultrasonically dispersed in deionized water to form a dispersion liquid, and the pH of the dispersion liquid is adjusted to 6.8±0.2;

[0042] S2: 3 parts of amino polyethylene glycol carboxyl are dissolved in ethanol, 1 part of a nanosilver antibacterial agent is added, and magnetic stirring is performed for 2 hours to form a modification liquid;

[0043] S3: The modification liquid and the dispersion liquid are mixed to obtain a composite modifier.

[0044] S4: 91 parts of nylon fabric pre-cleaned with deionized water are immersed in a solution containing the composite modifier at a bath ratio of 1:20, wherein the solution containing the composite modifier is an ethanol-water mixture, and the ethanol-water volume ratio of the ethanol-water mixture is 1:2; the nylon fabric is immersed in the ethanol-water mixture at 55±2℃ for 2 hours, while being stirred at a low speed of 50 rpm, to obtain a modified nylon fabric; the modified nylon fabric is taken out and dried at 90±2℃ for 30 minutes to obtain a high-elastic antibacterial modified nylon fabric.

[0045] Example 2

[0046] The difference between this example and Example 1 is that in step S1 of this example, TEMPO-mediated oxidation method is used to convert the hydroxyl groups of nanocellulose into carboxylic acid form to obtain carboxylated nanocellulose (C-CNFs), and then the nanocellulose is dispersed in deionized water to form a dispersion liquid.

[0047] Example 3

[0048] The difference between this example and Example 1 is that in step S1 of this example, 1% of a polyacrylic acid sodium dispersant is also added for dispersion.

[0049] Example 4

[0050] The difference between this example and Example 1 is that in step S2 of this example, the antibacterial agent is a composite antibacterial agent prepared by using microcapsule coating technology to wrap nanosilver with chitosan.

[0051] Example 5

[0052] The difference between this embodiment and embodiment 1 is that in step S4 of this embodiment, after the polyamide fabric is soaked, the modified polyamide fabric is taken out, first rolled by a roller to a pick-up rate of 70±5%, then dried at 75±5℃ for 10 minutes, and finally dried at 110±2℃ for 20 minutes, to obtain the high-elasticity antibacterial modified polyamide fabric.

[0053] Comparative Example 1

[0054] The difference between this comparative example and embodiment 1 is that in steps S1-S3 of this comparative example, the nanocellulose, the aminopolyethylene glycol carboxyl group and the antibacterial agent are all directly added into the ethanol solution, mixed uniformly, and prepared into a solution containing the composite modifier.

[0055] Comparative Example 2

[0056] The difference between this comparative example and embodiment 1 is that in this comparative example, the aminopolyethylene glycol carboxyl group is replaced by polyvinyl alcohol.

[0057] Comparative Example 3

[0058] The difference between this comparative example and embodiment 1 is that in this comparative example, the aminopolyethylene glycol carboxyl group is replaced by alanine.

[0059] Comparative Example 4

[0060] The difference between this comparative example and embodiment 1 is that in step S1 of this comparative example, the pH of the dispersion liquid is adjusted to 8±0.2.

[0061] Comparative Example 5

[0062] The difference between this comparative example and embodiment 1 is that in step S2 of this comparative example, no antibacterial agent is added, but in step S4, the antibacterial agent is added into the solution containing the composite modifier, and then the polyamide fabric is impregnated to obtain the modified polyamide fabric.

[0063] The modified polyamide fabric samples prepared above are numbered, wherein the sample numbers of examples 1-5 are 1-5, and the sample numbers of comparative examples 1-5 are 6-10.

[0064] Physical and chemical property test

[0065] (1) Elasticity detection:

[0066] According to the national standard GB / T 3923.1-2013 Textile Fabric Tensile Properties Part 1: Determination of Breaking Force and Elongation at Break (Strip Method), the tensile properties of the modified polyamide fabric in the examples and comparative examples are tested.

[0067] Instrument: XLW-500N Textile Fabric Tensile Property Tester.

[0068] Method: Take the sample of the nylon fabric to make a standard sample, and stretch it at a stretching rate of 200 mm / min until it breaks off to determine the elongation at break; and test the elastic recovery rate at a fixed elongation of 50%, and take the average value after 5 cycles. Among them, the gauge length is set to 200 mm.

[0069] (2) Anti-bacterial performance test:

[0070] According to the national standard GB / T 20944.3-2008 "Evaluation of the antibacterial performance of textiles Part 3: oscillation method", the modified nylon fabric in the examples and comparative examples is tested. The antibacterial rate of the modified nylon fabric on Escherichia coli (ATCC 25922) and Staphylococcus aureus (ATCC 6538) is obtained. Among them, the antibacterial rate = (the number of bacteria in the blank group - the number of bacteria in the sample group) / the number of bacteria in the blank group x 100%.

[0071] The test results are shown in Table 1.

[0072] Table 1

[0073]

[0074] From the test results in Table 1, it can be seen that Examples 1-5 have better elastic effect and antibacterial effect compared with Comparative Examples 1-5.

[0075] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any equivalent embodiments with equivalent changes are equivalent to the above embodiments. Any modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, which does not deviate from the technical solution of the present application, are still within the scope of the technical solution of the present application.

Claims

1. A method for preparing a high-elasticity antibacterial modified nylon fabric, characterized in that, the high-elasticity antibacterial modified nylon fabric comprises 90-95 parts by weight of a nylon fabric and 5-10 parts by weight of a composite modifier; the composite modifier comprises nanocellulose, amino polyethylene glycol carboxyl, and an antibacterial agent; the nanocellulose accounts for 40-60% by weight of the composite modifier; the amino polyethylene glycol carboxyl accounts for 20-40% by weight of the composite modifier; and the antibacterial agent accounts for 10-30% by weight of the composite modifier; the method comprises the following steps: S1: dispersing nanocellulose in deionized water to form a dispersion liquid; adjusting the pH of the dispersion liquid to 6-7; S2: dispersing amino polyethylene glycol carboxyl in ethanol and adding an antibacterial agent, and then dispersing to form a modification liquid; S3: mixing the modification liquid and the dispersion liquid to obtain a solution containing the composite modifier; S4: impregnating the nylon fabric in the solution containing the composite modifier to obtain a modified nylon fabric.

2. The method of claim 1, wherein the modified nylon fabric is prepared by the steps of: The nanocellulose has a weight average molecular weight of 4000-8000.

3. The method of claim 1, wherein the modified nylon fabric is prepared by a process comprising: (a) providing a nylon fabric; (b) contacting the nylon fabric with a solution comprising a polyamine and a solvent; and (c) drying the nylon fabric. The nanocellulose is EMPO-oxidized, carboxylated, carboxymethylated, silane-coupled modified, or sulfonated modified nanocellulose.

4. The method of claim 1, wherein the modified nylon fabric is prepared by a process comprising: The mass ratio of the nanocellulose to the amino polyethylene glycol carboxyl is 1-2:

1.

5. The method of claim 1, wherein the modified nylon fabric is prepared by a process comprising: The antibacterial agent is at least one of a nano-silver antibacterial agent, a zinc oxide antibacterial agent, a tea polyphenol quaternary ammonium salt antibacterial agent, a chitosan quaternary ammonium salt antibacterial agent, and a chitosan nano-silver antibacterial agent.

6. The method of claim 1, wherein the modified nylon fabric is prepared by a process comprising: In step S4, the solution is an ethanol-water mixture, and the ethanol-water mixture has a volume ratio of ethanol to water of 1:1-2.

7. The method of claim 1, wherein the modified nylon fabric is prepared by a process comprising: (a) providing a nylon fabric; (b) contacting the nylon fabric with a solution comprising a polyamine and a solvent; and (c) drying the nylon fabric. In step S4, the solution has a temperature condition of 50-60℃, and the nylon fabric is soaked for 1-4 hours. 8.A textile product comprising the modified nylon fabric prepared by the method of any one of claims 1-7.

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