High-elastic antibacterial modified chinlon fabric and preparation method thereof

Abstract

The invention relates to a high-elastic antibacterial modified chinlon fabric and a preparation method thereof. The high-elastic antibacterial modified chinlon fabric comprises 90-95 parts by weight of a chinlon fabric and 5-10 parts by weight of a composite modifier, wherein the composite modifier comprises nano cellulose, amino polyethylene glycol carboxyl and an antibacterial agent; the nano cellulose accounts for 40-60% of the weight of the composite modifier; the weight of the amino polyethylene glycol carboxyl accounts for 20-40% of the weight of the composite modifier; the antibacterial agent accounts for 10-30% of the weight of the composite modifier. In the composite modifier, the nano cellulose and amino polyethylene glycol carboxyl form a uniform modified layer on the surface of the fiber to enhance the elasticity and toughness of the fiber, the antibacterial agent is added into the modifier, and the adsorption effect of the nano cellulose is combined with the bactericidal effect of the antibacterial agent to form a dual antibacterial mechanism, so that the antibacterial property of the fiber is improved. The antibacterial performance of the fiber is remarkably improved, so that the high requirements of underwear such as underpants on materials can be better met.

Description

Technical Field

[0001] The present invention belongs to the technical field of textiles, and particularly relates to a highly elastic antibacterial modified polyamide fabric and a preparation method thereof. Background Art

[0002] Polyamide (nylon) fibers are widely used in the textile industry due to their excellent strength, abrasion resistance and chemical corrosion resistance. However, existing polyamide fabrics have disadvantages such as insufficient elastic recovery performance and antibacterial performance, which limit their application in the textile industry, especially in some high-end close-fitting clothing fields.

[0003] The main reasons for the insufficient elasticity of polyamide are as follows: First, the coexistence of hydrophobic methylene groups and hydrophilic amide groups in the polyamide molecular chain leads to uneven distribution of the intermolecular forces, affecting the elastic recovery ability; Second, processes such as stretching and heat treatment during spinning and weaving may cause changes or damage to the internal structure of the fiber, thereby reducing elasticity; Third, the elasticity of polyamide depends on the twisting and recovery of amide bonds, but high temperature or long-term light exposure will damage the molecular chain stability, resulting in elastic attenuation.

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

[0005] With the improvement of people's living quality, higher requirements are put forward for fiber materials in the field of close-fitting clothing such as underwear. At present, ordinary polyamide fabrics have insufficient elasticity, poor antibacterial performance, are prone to bacterial growth and cause odors, affecting hygiene and health, and cannot meet people's requirements for comfort and health.

[0006] Therefore, developing a modified polyamide fabric that has both excellent elasticity and long-lasting antibacterial performance has become an urgent problem for those skilled in the art to solve. Summary of the Invention

[0007] The purpose of the present invention is to provide a highly elastic antibacterial modified polyamide fabric and a preparation method thereof, so as to improve the elastic recovery rate and antibacterial ability of the fiber.

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

[0009] A highly elastic 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 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.

[0010] The present invention uses nanocellulose and amino polyethylene glycol carboxyl as composite modifiers to modify nylon fabrics, wherein the nylon fabrics have amide groups, and the nanocellulose is used as a nanofiller to enhance the orientation degree and crystal uniformity of the molecular chains in the nylon fabrics, thereby improving elasticity; the amino polyethylene glycol carboxyl has amino groups and carboxyl groups, and the molecules are relatively small, which enables it to simultaneously form molecular hydrogen bonds with the nylon polymer chains, construct a three-dimensional cross-linked network, and make the nylon polymer chains present a non-crystalline state of irregular entanglement when not under force, thereby improving the tensile modulus and elastic recovery rate. Since the effect of molecular hydrogen bonds is a physical effect and is reversible, when stretched, these chain segments are straightened to form elasticity; after releasing the external force, the molecular chains are re-curled by internal energy to form plasticity. Therefore, the modified nylon fabric of the present invention has both elastic and plastic effects, while the existing modified nylon fabrics bonded by chemical bonds are chemical effects, which are irreversible and easily lose elasticity.

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

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

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

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

[0015] A method for preparing the above-mentioned highly elastic antibacterial modified nylon fabric comprises the following steps:

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

[0017] S2: dispersing the amino polyethylene glycol carboxyl group in ethanol, adding an antimicrobial agent, and dispersing to form a modified solution;

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

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

[0020] In this technical solution, the high modulus and high strength characteristics of nanocellulose can effectively form a rigid-flexible composite structure with polyamide, enhancing the mechanical properties of the fiber, especially the elastic recovery rate. It transfers stress through interfacial hydrogen bonds and physically entangles with polyamide molecules, increasing the complexity of the network structure inside the fiber, inhibiting the slippage of molecular chains, and improving the elastic recovery rate. Moreover, the porous structure on the surface of nanocellulose can provide loading sites for amino-polyethylene glycol carboxyl and the antibacterial agent, reducing particle aggregation and prolonging the release period of the antibacterial agent.

[0021] The polyethylene glycol chain segment in amino-polyethylene glycol carboxyl provides a molecular chain slippage space to achieve the synergy of "rigidity enhancement + flexible buffering". The carboxyl group enhances the hydrophilicity of the fiber surface, promotes the uniform dispersion of the antibacterial agent, and can also interact with the antibacterial agent due to the active functional groups (such as amino and carboxyl) it contains, forming a stable chemical bond, which helps to improve the adhesion fastness of the antibacterial agent on the fiber surface and prolong the durability of the antibacterial effect.

[0022] The antibacterial agent is fixed on the fiber surface through physical adsorption or covalent bonds, enhancing the binding force and inhibiting bacterial proliferation, thereby obtaining a highly elastic antibacterial modified polyamide fabric.

[0023] Further, the specific preparation method of step S1 is as follows: Step S1 further includes the following steps: Adjust 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 groups) on the surface of nanocellulose are negatively charged, while the amino group of amino-polyethylene glycol carboxyl is positively charged. The two are combined through electrostatic adsorption, so that the amino-polyethylene glycol carboxyl is loaded on the nanocellulose, which is beneficial to the more uniform distribution and better elasticity of nanocellulose and amino-polyethylene glycol carboxyl relative to each other. In addition, pH 6-7 is the stable dispersion range of nanocellulose, avoiding a decrease in the loading efficiency due to aggregation.

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

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

[0027] Preferably, in step S4, before adding the nylon fabric into the solution containing the composite modifier, the nylon fabric is first cleaned with anhydrous ethanol or deionized water to remove the surface oil stains. After cleaning, drain the water and then add it into the solution containing the composite modifier.

[0028] Specifically, the surface oil stains on the nylon fabric can also be removed more effectively by appropriately increasing the cleaning temperature or by using ultrasonic cleaning.

[0029] Specifically, the nylon fabric can also be surface-treated, such as by plasma treatment, etc., to increase the surface active groups, so as to better modify the nylon fabric.

[0030] Further, in 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 step S4, the temperature condition of the solution is 50 - 60 °C, and the soaking time of the nylon fabric is 1 - 4 hours.

[0032] Further, in step S4, after the nylon fabric is soaked, it is first padded, and the padding pick-up is 70 - 80%, then dried at 70 - 80 °C for 10 - 15 minutes, and finally dried at 100 - 120 °C for 20 - 25 minutes to obtain the high-elastic antibacterial modified nylon fabric.

[0033] A textile product includes the above-mentioned modified nylon fabric, or includes the modified nylon fabric prepared by the above-mentioned preparation method. Preferably, the textile product is underwear.

[0034] Advantages of the present invention:

[0035] (1) In the modifier of the present invention, nanocellulose and amino polyethylene glycol carboxyl are added. The nanocellulose and amino polyethylene glycol carboxyl form a uniform modified layer on the fiber surface, enhancing the elasticity and toughness of the fiber. And an antibacterial agent is added to the modifier. The adsorption effect of nanocellulose is combined with the bactericidal effect of the antibacterial agent to form a dual antibacterial mechanism, significantly improving the antibacterial performance of the fiber, enabling it to better meet the high requirements of materials for close-fitting clothes such as underwear.

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

[0037] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with embodiments, details the specific embodiments, structures, features and their effects according to the present invention.

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

[0039] Example 1

[0040] This embodiment prepares a highly elastic and antibacterial modified nylon fabric, comprising the following steps:

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

[0042] S2: Dissolve 3 parts of amino polyethylene glycol carboxyl in ethanol, add 1 part of nano silver antibacterial agent, and disperse under magnetic stirring for 2 hours to form a modified solution;

[0043] S3: Mixing the modified liquid with the dispersion liquid to obtain a composite modifier.

[0044] S4: 91 portions of nylon fabrics pre-cleaned with deionized water are immersed in a solution containing a 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°C for 2 hours, and stirred at a low speed of 50rpm to obtain a modified nylon fabric; the modified nylon fabric is taken out and dried at 90+2°C for 30 minutes to obtain a highly elastic and antibacterial modified nylon fabric.

[0045] Example 2

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

[0047] Example 3

[0048] The difference between this embodiment and embodiment 1 is that in step S1 of this embodiment, 1% sodium polyacrylate dispersant is further added for dispersion.

[0049] Example 4

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

[0051] Example 5

[0052] The difference between this embodiment and Embodiment 1 is that in step S4 of this embodiment, after the nylon fabric is soaked, the modified nylon fabric is taken out, first passed through a padder to a liquor pickup of 70±5%, then dried at 75±5°C for 10 minutes, and finally dried at 110±2°C for 20 minutes to obtain a high-elastic antibacterial modified nylon fabric.

[0053] Comparative Example 1

[0054] The difference between this comparative example and Embodiment 1 is that steps S1-S3 of this comparative example are: directly adding all of nanocellulose, amino polyethylene glycol carboxyl, and antibacterial agent into an ethanol solution, mixing evenly to prepare a solution containing a composite modifier.

[0055] Comparative Example 2

[0056] The difference between this comparative example and Embodiment 1 is that this comparative example replaces amino polyethylene glycol carboxyl with polyvinyl alcohol.

[0057] Comparative Example 3

[0058] The difference between this comparative example and Embodiment 1 is that this comparative example replaces amino polyethylene glycol carboxyl with 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 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, after adding the antibacterial agent to the solution containing the composite modifier, the nylon fabric is added for impregnation to obtain a modified nylon fabric.

[0063] The samples of the modified nylon fabric prepared above are numbered. Among them, the samples of Embodiments 1-5 are numbered 1-5, and the samples of Comparative Examples 1-5 are numbered 6-10.

[0064] Physical and chemical property tests

[0065] (1) Elasticity detection:

[0066] According to the national standard GB / T 3923.1-2013 Textiles - Tensile properties of fabrics - Part 1: Determination of breaking force and elongation at break (strip method), the tensile properties of the modified nylon fabric in the examples and comparative examples were tested.

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

[0068] Method: Take a sample of nylon fabric to make a standard specimen, stretch it at a stretching rate of 200 mm / min until it breaks off, and measure 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) Antibacterial performance detection:

[0070] According to the national standard GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Oscillation method", the modified nylon fabrics in the examples and comparative examples are detected. Obtain the antibacterial rates of the modified nylon fabrics against Escherichia coli (ATCC25922) and Staphylococcus aureus (ATCC 6538). Among them, the antibacterial rate = (number of colonies in the blank group - number of colonies in the specimen group) / number of colonies in the blank group × 100%.

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

[0072] Table 1

[0073]

[0074] It can be seen from the test results in Table 1 that Examples 1-5 have better elastic effects and antibacterial effects compared with Comparative Examples 1-5.

[0075] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the technical content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A highly elastic antibacterial modified polyamide fabric, characterized in that, It comprises 90 - 95 parts by weight of polyamide fabric and 5 - 10 parts by weight of a composite modifier; Among them, the composite modifier contains nanocellulose, amino polyethylene glycol carboxyl, and an antibacterial agent; the proportion of nanocellulose in the weight of the composite modifier is 40 - 60%; the proportion of amino polyethylene glycol carboxyl in the weight of the composite modifier is 20 - 40%; the proportion of the antibacterial agent in the weight of the composite modifier is 10 - 30%.

2. The modified polyamide fabric according to claim 1, wherein The weight - average molecular weight of the nanocellulose is 4000 - 8000.

3. The modified polyamide fabric according to claim 1, wherein, The nanocellulose is EMPO - oxidized, carboxylated, carboxymethylated, silane - coupled modified, or sulfonated modified nanocellulose.

4. The modified polyamide fabric according to claim 1, wherein, The mass ratio of the nanocellulose to the amino polyethylene glycol carboxyl is 1 - 2:

1.

5. The modified polyamide fabric according to claim 1, characterized in that, The antibacterial agent is at least one of nano - silver antibacterial agent, zinc oxide antibacterial agent, tea polyphenol quaternary ammonium salt antibacterial agent, chitosan quaternary ammonium salt antibacterial agent, and chitosan nano - silver antibacterial agent.

6. A preparation method of a highly elastic antibacterial modified polyamide fabric as described in any one of claims 1-5, characterized in that, It includes the following steps: S1: Disperse the nanocellulose in deionized water to form a dispersion; S2: Disperse the amino polyethylene glycol carboxyl in ethanol, add the antibacterial agent, and disperse to form a modified liquid; S3: Mix the modified liquid with the dispersion to obtain a solution containing the composite modifier. S4: Immerse the polyamide fabric in the solution containing the composite modifier to obtain a modified polyamide fabric.

7. The preparation method according to claim 6, wherein Step S1 further includes the following step: Adjust the pH of the dispersion to 6 - 7.

8. The preparation method according to claim 6, characterized in that, In step S4, the solution is an ethanol - water mixture, and the ethanol - water volume ratio of the ethanol - water mixture is 1:1 - 2.

9. The preparation method according to claim 6, characterized in that, In step S4, the temperature condition of the solution is 50 - 60°C, and the soaking time of the polyamide fabric is 1 - 4 hours.

10. A textile product, comprising the modified polyamide fabric according to any one of claims 1 - 5, or comprising the modified polyamide fabric prepared by the preparation method according to any one of claims 6 - 9.

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