Skin-friendly chinlon knitted fabric with antibacterial performance and preparation method of skin-friendly chinlon knitted fabric

Abstract

The invention relates to the field of layered composite fabrics, and discloses a skin-friendly chinlon knitted fabric with antibacterial performance and a preparation method thereof. The preparation method comprises the following steps: by taking dimethylaniline / copper sulfate as an initiating system, carrying out graft copolymerization on nylon 66 fibers and dimethylaminoethyl methacrylate to obtain dimethylaminoethyl methacrylate grafted nylon 66 fibers, and carrying out condensation reaction on the dimethylaminoethyl methacrylate grafted nylon 66 fibers and sodium 3-chloropropionate to obtain a modified fiber intermediate; reacting the modified fiber intermediate with an HBr aqueous solution, and grafting MnO4 <-> through an ion exchange reaction to obtain modified nylon 66 fiber; and spinning, weaving and compounding the modified nylon 66 fiber to obtain the skin-friendly nylon knitted fabric with the antibacterial property.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of layered composite fabrics, in particular to a skin-friendly nylon knitted fabric with antibacterial properties and a preparation method thereof. BACKGROUND

[0002] Knitted fabric is a fabric formed by bending yarn with knitting needles and interlocking each other. It has the characteristics of softness, moisture absorption, air permeability, sweat absorption, warmth retention, etc. It has excellent elasticity and extensibility. Compared with woven fabric, it has high yield and is suitable for small batch production. Knitted fabric has soft texture, good wrinkle resistance and air permeability, and also has high extensibility and elasticity. It is suitable for underwear, tight clothes and sportswear, etc. After changing the structure and improving the dimensional stability, it can also be used as outerwear. Knitted fabric can be woven into gray fabric first, and then cut and sewn into various knitted products. It can also be directly woven into fully formed or partially formed products, such as socks and gloves. However, the existing knitted fabric has poor antibacterial effect, which leads to the attachment of harmful organisms such as bacteria and mites on the clothes, causing harm to the human body, and the comfort of the clothes is poor.

[0003] The existing antibacterial knitted fabric has poor antibacterial effect. Usually, an antibacterial layer is coated on the surface of the knitted fabric. After a period of use, the antibacterial layer is easy to fall off, which greatly reduces the antibacterial effect, making the fabric easy to breed bacteria and causing inconvenience to people when wearing or using. Therefore, the existing knitted fabric with antibacterial properties cannot meet the needs in actual use, so there is an urgent need for improved technology to solve the above problems.

[0004] The existing technology, such as Chinese patent application CN213441479U, discloses an antibacterial knitted fabric. By fixing and installing a nano-silver antibacterial coating on the surface of the multi-layer base fabric layer, the knitted fabric has good antibacterial and sterilization performance. However, the nano-silver coating is easy to fall off due to mechanical friction and repeated washing, resulting in poor antibacterial performance. At the same time, the nano-silver coating covers the fiber pores, resulting in a decrease in fabric softness and affecting the skin-friendliness. In addition, free nano-silver particles are harmful to the human body and the environment, and are not safe and environmentally friendly. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a skin-friendly nylon knitted fabric with antibacterial properties and a preparation method thereof. The nylon knitted fabric has excellent antibacterial properties and skin-friendliness.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a preparation method of a skin-friendly nylon knitted fabric with antibacterial properties, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting, after the reaction is completed, post-processing, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding antioxidant p-hydroxyanisole, reacting, after the reaction is completed, taking the solid product, washing, drying, obtaining modified fiber intermediate; Step (2), mixing the modified fiber intermediate with 0.4wt% HBr aqueous solution, reacting, after the reaction is completed, taking the solid product, washing, drying, obtaining intermediate product; mixing the intermediate product with 1mol / L KMnO4 aqueous solution, reacting, after the reaction is completed, taking the solid product, washing, drying, obtaining modified nylon 66 fiber; Step (3), spinning the modified nylon 66 fiber into yarn, weaving, respectively obtaining surface layer knitted fabric and inner layer knitted fabric; laminating the surface layer knitted fabric and the inner layer knitted fabric, aligning, compounding, obtaining skin-friendly chinlon knitted fabric with antibacterial property.

[0007] Preferably, in the step (1), when preparing dimethylaminoethyl methacrylate grafted nylon 66 fiber: the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10: (160-200): (40-60): (2-6): (0.1-0.2): (0.2-0.3); the reaction condition is: reacting in nitrogen atmosphere, at 60-80℃ for 4-6h.

[0008] Preferably, in the step (1), when preparing dimethylaminoethyl methacrylate grafted nylon 66 fiber: the post-processing step is: taking out the nylon 66 fiber, Soxhlet extracting with acetone for 20-24h, after the extraction is completed, drying at 60-70℃ for 20-24h.

[0009] Preferably, in the step (1), when preparing modified fiber intermediate: the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, p-hydroxyanisole is 50: (4-6): (360-400): (100-140): (0.01-0.02); the reaction condition is: reacting in nitrogen atmosphere, at 60-70℃ for 5-7h.

[0010] Preferably, in the step (2), when preparing intermediate product: the mass ratio of modified fiber intermediate and 0.4wt% HBr aqueous solution is 1: (80-100); the reaction condition is: reacting at 110-130r / min, at room temperature for 2-4h.

[0011] Preferably, in the step (2), when the modified nylon 66 fiber is prepared: the mass ratio of the intermediate product to the 1 mol / L KMnO4 aqueous solution is 1: (80-100) ; the reaction condition is: the rotation speed is 110-130 r / min, the reaction is carried out at room temperature for 1-2 h.

[0012] Preferably, in the step (3), when the surface layer knitted fabric and the inner layer knitted fabric are prepared: the yarn count is 40-60 S in English count, the gram weight of the surface layer knitted fabric is 80-100 g / m 2 , and the gram weight of the inner layer knitted fabric is 60-80 g / m 2 .

[0013] Preferably, in the step (3), when the skin-friendly polyamide knitted fabric with antibacterial property is prepared: the compounding mode is sewing, the polyamide sewing thread is used as the sewing thread, and the surface layer knitted fabric and the inner layer knitted fabric are sewn by a multi-layer fabric quilting machine.

[0014] Preferably, the skin-friendly polyamide knitted fabric with antibacterial property is prepared by using the preparation method of the skin-friendly polyamide knitted fabric with antibacterial property.

[0015] Compared with the prior art, the application has the following beneficial effects: in the application, dimethyl aniline / copper sulfate is used as an initiation system, nylon 66 fiber is grafted and copolymerized with dimethylaminoethyl methacrylate, part of the grafted dimethylaminoethyl methacrylate is subjected to a condensation reaction with sodium 3-chloropropionate, positive charge quaternary ammonium groups and negative charge hydrophilic groups are introduced, a modified fiber intermediate is obtained, the net charge of the zwitterionic structure is zero, and the electrostatic repulsion reduces bacterial adhesion, the high hydrophilicity reduces skin friction, the skin-friendliness is improved, and the antistatic property is improved; Br - is grafted on the grafted dimethylaminoethyl methacrylate, the remaining tertiary amine functional groups are protonated, MnO4 - is grafted through an ion exchange reaction, and the modified nylon 66 fiber is obtained.

[0016] The zwitterionic structure grafted on the nylon 66 fiber mainly performs physical contact sterilization, the positive and negative charge regions of the zwitterion can destroy the charge balance of the bacterial cell membrane, cause the membrane structure to be disordered, the strong hydrophilicity forms a dense hydration layer, and bacterial adhesion is reduced; the MnO4 - grafted on the nylon 66 fiber mainly performs chemical sterilization through the strong oxidizing property, and destroys the structure and function of microorganisms; the two produce a synergistic antibacterial effect on the nylon 66 fiber, enhance the antibacterial property, and improve the antibacterial durability.

[0017] The modified nylon 66 fibers are spun and woven to obtain a surface layer knitted fabric and an inner layer knitted fabric, and then the two knitted fabrics are sewn to obtain a skin-friendly nylon knitted fabric with antibacterial properties. Under the action of the double-layer knitted fabric, the loftiness is further increased, the skin friction is reduced, and the skin-friendly performance is improved. In addition, after the double-layer sewing, the tear resistance is enhanced, the deformation generated in the use process is reduced, and the applicability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a process flow chart for preparing the skin-friendly nylon knitted fabric with antibacterial properties in the present application; Figure 2 is a structural schematic diagram of the skin-friendly nylon knitted fabric with antibacterial properties in the present application; Figure 3 is a column chart of the resistance to Staphylococcus aureus rate in the comprehensive performance test of the skin-friendly nylon knitted fabric with antibacterial properties prepared by examples 1-5 and comparative examples 1-2 in the present application; Figure 4 is a column chart of the resistance to Candida albicans rate in the comprehensive performance test of the skin-friendly nylon knitted fabric with antibacterial properties prepared by examples 1-5 and comparative examples 1-2 in the present application; Figure 5 is a column chart of the surface friction coefficient in the comprehensive performance test of the skin-friendly nylon knitted fabric with antibacterial properties prepared by examples 1-5 and comparative examples 1-2 in the present application.

[0019] In the figure: 1, surface layer knitted fabric; 2, inner layer knitted fabric. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0021] Example 1 The present embodiment discloses a preparation method of a skin-friendly nylon knitted fabric with antibacterial properties, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting for 4h under nitrogen atmosphere at 80℃, after the reaction, taking out the nylon 66 fiber, Soxhlet extracting with acetone for 24h, after the extraction, drying at 70℃ for 20h, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; wherein the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10:200:60:6:0.2:0.3; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding antioxidant p-hydroxyanisole, reacting for 5h under nitrogen atmosphere at 70℃, after the reaction, taking the solid product, adding acetone and diethyl ether 5 times respectively, the amount of acetone and diethyl ether is 2 times the mass of the solid product, drying at 70℃ for 20h, obtaining modified fiber intermediate; wherein the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, p-hydroxyanisole is 50:6:400:140:0.02; Step (2), mixing the modified fiber intermediate with 0.4wt% HBr aqueous solution, reacting for 2h at room temperature under the rotation speed of 130r / min, after the reaction, taking the solid product, washing with water 5 times, the amount of water is 2 times the mass of the solid product, drying at 80℃ for 12h, obtaining intermediate product; wherein the mass ratio of modified fiber intermediate and 0.4wt% HBr aqueous solution is 1:100; mixing the intermediate product with 1mol / L KMnO4 aqueous solution, reacting for 1h at room temperature under the rotation speed of 130r / min, after the reaction, taking the solid product, washing with water 5 times, the amount of water is 2 times the mass of the solid product, drying at 80℃ for 12h, obtaining modified nylon 66 fiber; wherein the mass ratio of intermediate product and 1mol / L KMnO4 aqueous solution is 1:100; Step (3), spinning the modified nylon 66 fiber into yarn, weaving by using circular knitting machine, obtaining face layer knitted fabric and inner layer knitted fabric respectively; wherein the yarn count is 60S, the gram weight of the face layer knitted fabric is 100g / m 2 , the gram weight of the inner layer knitted fabric is 80g / m 2 ; laminating the face layer knitted fabric and the inner layer knitted fabric, aligning, using nylon sewing thread as sewing thread, sewing the face layer knitted fabric and the inner layer knitted fabric by using multi-layer fabric quilting machine, obtaining skin-friendly nylon knitted fabric with antibacterial property.

[0022] Example 2 The embodiment discloses a preparation method of skin-friendly nylon knitted fabric with antibacterial property, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting for 6h under nitrogen atmosphere at 60℃, after the reaction, taking out the nylon 66 fiber, Soxhlet extracting for 20h with acetone, after the extraction, drying for 24h at 60℃, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; wherein the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10:160:40:2:0.1:0.2; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding antioxidant p-hydroxyanisole, reacting for 7h under nitrogen atmosphere at 60℃, after the reaction, taking the solid product, adding acetone and diethyl ether which are 4 times of the mass of the solid product respectively, washing for 3 times, drying for 24h at 60℃, obtaining modified fiber intermediate; wherein the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, p-hydroxyanisole is 50:4:360:100:0.01; Step (2), mixing the modified fiber intermediate with 0.4wt% HBr aqueous solution, reacting for 4h at room temperature under the rotation speed of 110r / min, after the reaction, taking the solid product, washing with water which is 4 times of the mass of the solid product for 3 times, drying for 16h at 60℃, obtaining intermediate product; wherein the mass ratio of the modified fiber intermediate and 0.4wt% HBr aqueous solution is 1:80; mixing the intermediate product with 1mol / L KMnO4 aqueous solution, reacting for 2h at room temperature under the rotation speed of 110r / min, after the reaction, taking the solid product, washing with water which is 4 times of the mass of the solid product for 3 times, drying for 16h at 60℃, obtaining modified nylon 66 fiber; wherein the mass ratio of the intermediate product and 1mol / L KMnO4 aqueous solution is 1:80; Step (3), spinning the modified nylon 66 fiber into yarn, weaving by using circular knitting machine, obtaining face layer knitted fabric and inner layer knitted fabric respectively; wherein the yarn count is 40S in English count, the gram weight of the face layer knitted fabric is 80g / m 2 , the gram weight of the inner layer knitted fabric is 60g / m 2 ; laminating the face layer knitted fabric and the inner layer knitted fabric, aligning, using polyamide sewing thread as sewing thread, sewing the face layer knitted fabric and the inner layer knitted fabric by using multi-layer fabric quilting machine, obtaining skin-friendly polyamide knitted fabric with antibacterial property.

[0023] Example 3 The embodiment discloses a preparation method of skin-friendly polyamide knitted fabric with antibacterial property, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting for 4h under nitrogen atmosphere at 75℃, after the reaction, taking out the nylon 66 fiber, Soxhlet extracting with acetone for 23h, after the extraction, drying at 68℃ for 21h, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; wherein the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10:190:55:5:0.2:0.3; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding antioxidant p-hydroxyanisole, reacting for 5h under nitrogen atmosphere at 68℃, after the reaction, taking the solid product, adding acetone and diethyl ether 5 times respectively, the amount of acetone and diethyl ether is 2 times the mass of the solid product, drying at 68℃ for 21h, obtaining modified fiber intermediate; wherein the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, p-hydroxyanisole is 50:5.5:390:130:0.02; Step (2), mixing the modified fiber intermediate with 0.4wt% HBr aqueous solution, reacting for 2h at room temperature under the rotation speed of 125r / min, after the reaction, taking the solid product, washing with water 5 times, the amount of water is 2 times the mass of the solid product, drying at 75℃ for 13h, obtaining intermediate product; wherein the mass ratio of modified fiber intermediate and 0.4wt% HBr aqueous solution is 1:95; mixing the intermediate product with 1mol / L KMnO4 aqueous solution, reacting for 1h at room temperature under the rotation speed of 125r / min, after the reaction, taking the solid product, washing with water 5 times, the amount of water is 2 times the mass of the solid product, drying at 75℃ for 13h, obtaining modified nylon 66 fiber; wherein the mass ratio of intermediate product and 1mol / L KMnO4 aqueous solution is 1:95; Step (3), spinning the modified nylon 66 fiber into yarn, weaving by using circular knitting machine, obtaining face layer knitted fabric and inner layer knitted fabric respectively; wherein the yarn count is 55S, the gram weight of the face layer knitted fabric is 95g / m 2 , the gram weight of the inner layer knitted fabric is 75g / m 2 ; laminating the face layer knitted fabric and the inner layer knitted fabric, aligning, using nylon sewing thread as sewing thread, sewing the face layer knitted fabric and the inner layer knitted fabric by using multi-layer fabric quilting machine, obtaining skin-friendly nylon knitted fabric with antibacterial property.

[0024] Example 4 The embodiment discloses a preparation method of skin-friendly nylon knitted fabric with antibacterial property, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting for 5h under nitrogen atmosphere at 70℃, after the reaction, taking out the nylon 66 fiber, Soxhlet extracting with acetone for 22h, after the extraction, drying at 65℃ for 22h, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; wherein the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10:180:50:4:0.15:0.25; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding antioxidant p-hydroxyanisole, reacting for 6h under nitrogen atmosphere at 65℃, after the reaction, taking the solid product, adding acetone and diethyl ether which are 3 times of the mass of the solid product respectively, washing 4 times, drying at 65℃ for 22h, obtaining modified fiber intermediate; wherein the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, p-hydroxyanisole is 50:5:380:120:0.015; Step (2), mixing the modified fiber intermediate with 0.4wt% HBr aqueous solution, reacting for 3h at room temperature under the rotation speed of 120r / min, after the reaction, taking the solid product, adding water which is 3 times of the mass of the solid product, washing 4 times, drying at 70℃ for 14h, obtaining intermediate product; wherein the mass ratio of the modified fiber intermediate and 0.4wt% HBr aqueous solution is 1:90; mixing the intermediate product with 1mol / L KMnO4 aqueous solution, reacting for 1.5h at room temperature under the rotation speed of 120r / min, after the reaction, taking the solid product, adding water which is 3 times of the mass of the solid product, washing 4 times, drying at 70℃ for 14h, obtaining modified nylon 66 fiber; wherein the mass ratio of the intermediate product and 1mol / L KMnO4 aqueous solution is 1:90; Step (3), spinning the modified nylon 66 fiber into yarn, weaving by using the circular knitting machine, obtaining face layer knitted fabric and inner layer knitted fabric respectively; wherein the yarn count is 50S in English count, the gram weight of the face layer knitted fabric is 90g / m 2 , the gram weight of the inner layer knitted fabric is 70g / m 2 ; laminating the face layer knitted fabric and the inner layer knitted fabric in alignment, using polyamide sewing thread as sewing thread, sewing the face layer knitted fabric and the inner layer knitted fabric by using multi-layer fabric quilting machine, obtaining skin-friendly polyamide knitted fabric with antibacterial property.

[0025] Example 5 The embodiment discloses a preparation method of skin-friendly polyamide knitted fabric with antibacterial property, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting for 6h under nitrogen atmosphere at 65℃, after the reaction, taking out the nylon 66 fiber, Soxhlet extracting with acetone for 21h, after the extraction, drying at 62℃ for 23h, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; wherein the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10:170:45:3:0.1:0.2; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding antioxidant p-hydroxyanisole, reacting for 7h under nitrogen atmosphere at 62℃, after the reaction, taking the solid product, adding acetone and diethyl ether which are 4 times the mass of the solid product respectively, washing 3 times, drying at 62℃ for 23h, obtaining modified fiber intermediate; wherein the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, p-hydroxyanisole is 50:4.5:370:110:0.01; Step (2), mixing the modified fiber intermediate with 0.4wt% HBr aqueous solution, reacting for 4h at room temperature under the rotation speed of 115r / min, after the reaction, taking the solid product, washing with water which is 4 times the mass of the solid product for 3 times, drying at 65℃ for 15h, obtaining intermediate product; wherein the mass ratio of modified fiber intermediate and 0.4wt% HBr aqueous solution is 1:85; mixing the intermediate product with 1mol / L KMnO4 aqueous solution, reacting for 2h at room temperature under the rotation speed of 115r / min, after the reaction, taking the solid product, washing with water which is 4 times the mass of the solid product for 3 times, drying at 65℃ for 15h, obtaining modified nylon 66 fiber; wherein the mass ratio of intermediate product and 1mol / L KMnO4 aqueous solution is 1:85; Step (3), spinning the modified nylon 66 fiber into yarn, weaving by using circular knitting machine, obtaining face layer knitted fabric and inner layer knitted fabric respectively; wherein the yarn count is 45S in English count, the gram weight of the face layer knitted fabric is 85g / m 2 , the gram weight of the inner layer knitted fabric is 65g / m 2 ; laminating the face layer knitted fabric and the inner layer knitted fabric in alignment, using polyamide sewing thread as sewing thread, sewing the face layer knitted fabric and the inner layer knitted fabric by using multi-layer fabric quilting machine, obtaining skin-friendly polyamide knitted fabric with antibacterial property.

[0026] Comparative Example 1 The comparative example discloses a preparation method of polyamide knitted fabric, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropanol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting at 60℃ for 6h in nitrogen atmosphere, after the reaction, taking out the nylon 66 fiber, Soxhlet extracting with acetone for 20h, after the extraction, drying at 60℃ for 24h, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; wherein the mass ratio of nylon 66 fiber, water, isopropanol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10:160:40:2:0.1:0.2; Step (2), mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber with 0.4wt% HBr aqueous solution, reacting at room temperature for 4h at 110r / min, after the reaction, taking the solid product, adding 4 times the mass of the solid product of water to wash 3 times, drying at 60℃ for 16h, obtaining an intermediate product; wherein the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber to 0.4wt% HBr aqueous solution is 1:80; mixing the intermediate product with 1mol / L KMnO4 aqueous solution, reacting at room temperature for 2h at 110r / min, after the reaction, taking the solid product, adding 4 times the mass of the solid product of water to wash 3 times, drying at 60℃ for 16h, obtaining modified nylon 66 fiber; wherein the mass ratio of the intermediate product to 1mol / L KMnO4 aqueous solution is 1:80; Step (3), spinning the modified nylon 66 fiber into yarn, using a circular knitting machine to weave, respectively obtaining a surface layer knitted fabric and an inner layer knitted fabric; wherein the yarn count is 40S in English count, the gram weight of the surface layer knitted fabric is 80g / m 2 , the gram weight of the inner layer knitted fabric is 60g / m 2 ; laminating and aligning the surface layer knitted fabric and the inner layer knitted fabric, using nylon sewing thread as sewing thread, sewing the surface layer knitted fabric and the inner layer knitted fabric through a multi-layer fabric quilting machine, obtaining a nylon knitted fabric.

[0027] Comparative Example 2 The comparative example discloses a preparation method of a nylon knitted fabric, comprising the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, initiator copper sulfate and dimethyl aniline, reacting for 6h under nitrogen atmosphere at 60℃, after the reaction, taking out the nylon 66 fiber, Soxhlet extracting for 20h with acetone, after the extraction, drying for 24h at 60℃, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; wherein the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate, dimethyl aniline is 10:160:40:2:0.1:0.2; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding antioxidant p-hydroxyanisole, reacting for 7h under nitrogen atmosphere at 60℃, after the reaction, taking the solid product, adding acetone and diethyl ether which are 4 times of the mass of the solid product respectively, washing for 3 times, drying for 24h at 60℃, obtaining modified fiber; wherein the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, p-hydroxyanisole is 50:4:360:100:0.01; Step (2), spinning the modified fiber into yarn, using a circular knitting machine to weave, obtaining face layer knitted fabric and inner layer knitted fabric respectively; wherein the yarn count is 40S in English count, the gram weight of the face layer knitted fabric is 80g / m 2 , the gram weight of the inner layer knitted fabric is 60g / m 2 ; laminating and aligning the face layer knitted fabric and the inner layer knitted fabric, using polyamide sewing thread as sewing thread, sewing the face layer knitted fabric and the inner layer knitted fabric through multi-layer fabric quilting machine, obtaining polyamide knitted fabric.

[0028] In the above examples and comparative examples: the nylon 66 fiber is from Cixi Dupont Fiber Industry Co., Ltd., product name: polyamide staple fiber, average fiber length: 38mm, specification: 1.5D; isopropyl alcohol is from Jiangsu Runfeng Synthetic Technology Co., Ltd., CAS number: 67-63-0; dimethylaminoethyl methacrylate is from Shanghai Aladdin Reagent Co., Ltd., CAS number: 2867-47-2; copper sulfate is from Tianjin Xinsen Biochemical Technology Co., Ltd., CAS number: 7758-98-7; dimethyl aniline is from Shandong Yuxuan Chemical Product Co., Ltd., CAS number: 121-69-7; p-hydroxyanisole is from Zhongshan Dixin Chemical Co., Ltd., CAS number: 150-76-5; HBr is from National Pharmaceutical Group Chemical Reagent Co., Ltd., CAS number: 10035-10-6; KMnO4 is from National Pharmaceutical Group Chemical Reagent Co., Ltd., CAS number: 7722-64-7.

[0029] Test example (1) Comprehensive performance test The comprehensive performance test was conducted on the polyamide knitted fabric prepared in Examples 1-5 and Comparative Examples 1-2. The specific test results are shown in Table 1.

[0030] The detection of each index in Table 1 is based on the following standards: the antibacterial rate is determined by GB / T20944.3-2008 "Evaluation of Antibacterial Properties of Textiles Part 3: Oscillation Method"; the surface friction coefficient is determined by FZ / T 01054-2012 "Test Method for Surface Friction Performance of Fabric"; and the elastic recovery rate is determined by FZ / T70006-2022 "Test Method for Tensile Elastic Recovery Rate of Knitted Fabric".

[0031] According to the test results in Table 1, the polyamide knitted fabric prepared in the present application has excellent antibacterial properties and skin-friendliness.

[0032] In Comparative Example 1, the grafting chain of dimethylaminoethyl methacrylate grafted on the nylon 66 fiber is not subjected to condensation reaction with sodium 3-chloropropionate, and the negatively charged hydrophilic group is not introduced in large amounts, the hydrophilicity is reduced, the zwitterionic structure is not formed, the bacterial adhesion through electrostatic repulsion cannot be effectively reduced, resulting in the decrease of antibacterial properties and skin-friendliness, so the antibacterial rate of Comparative Example 1 is lower than that of the examples, and the surface friction coefficient is larger than that of the examples.

[0033] In Comparative Example 2, the antibacterial ion MnO4 - is not partially grafted on the grafting chain of dimethylaminoethyl methacrylate, and only the physical contact sterilization through the electrostatic repulsion of the zwitterion on the surface of the nylon 66 fiber can be achieved, the structure and function of microorganisms cannot be destroyed from the inside, and the skin-friendliness is reduced due to the reduction of hydrophilic groups, so the antibacterial rate of Comparative Example 2 is lower than that of the examples, and the surface friction coefficient is larger than that of the examples.

[0034] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for producing a skin-friendly polyamide knitted fabric having antibacterial properties, characterized by, The method comprises the following steps: Step (1), mixing nylon 66 fiber, water, isopropyl alcohol, adding dimethylaminoethyl methacrylate, copper sulfate and dimethyl aniline, reacting, after the reaction is completed, post-treatment, obtaining dimethylaminoethyl methacrylate grafted nylon 66 fiber; mixing dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol, adding p-hydroxyanisole, reacting, after the reaction is completed, purifying, obtaining modified fiber intermediate; Step (2), mixing the modified fiber intermediate with HBr aqueous solution, reacting, after the reaction is completed, purifying, obtaining intermediate product; mixing the intermediate product with KMnO4 aqueous solution, reacting, after the reaction is completed, purifying, obtaining modified nylon 66 fiber; Step (3), spinning the modified nylon 66 fiber into yarn, weaving, respectively obtaining surface layer knitted fabric and inner layer knitted fabric; compounding the surface layer knitted fabric and the inner layer knitted fabric, obtaining skin-friendly chinlon knitted fabric with antibacterial property.

2. The method according to claim 1, wherein the method for preparing the skin-friendly and antibacterial knitted fabric is characterized in that, In the step (1), the mass ratio of nylon 66 fiber, water, isopropyl alcohol, dimethylaminoethyl methacrylate, copper sulfate and dimethyl aniline is 10: (160-200): (40-60): (2-6): (0.1-0.2): (0.2-0.3); when preparing the dimethylaminoethyl methacrylate grafted nylon 66 fiber, the reaction condition is that the reaction is carried out at 60-80 DEG C for 4-6h in nitrogen atmosphere.

3. The method for preparing a skin-friendly nylon knitted fabric with antibacterial properties according to claim 1, characterized in that, In the step (1), when preparing the dimethylaminoethyl methacrylate grafted nylon 66 fiber, the post-treatment step is that the nylon 66 fiber is extracted with acetone by Soxhlet extraction for 20-24h, and after the extraction is completed, the nylon 66 fiber is dried at 60-70 DEG C for 20-24h.

4. The method for preparing a skin-friendly nylon knitted fabric with antibacterial properties according to claim 1, characterized in that, In the step (1), the mass ratio of dimethylaminoethyl methacrylate grafted nylon 66 fiber, 3-chloropropionic acid sodium, water, isopropyl alcohol and p-hydroxyanisole is 50: (4-6): (360-400): (100-140): (0.01-0.02).

5. The method for preparing a skin-friendly nylon knitted fabric with antibacterial properties according to claim 1, characterized in that, In the step (1), when preparing the modified fiber intermediate, the reaction condition is that the reaction is carried out at 60-70 DEG C for 5-7h in nitrogen atmosphere; the purification step is that the solid product is washed with acetone and diethyl ether for 3-5 times, and the mass of acetone and diethyl ether is 2-4 times of the mass of the solid product, and the product is dried at 60-70 DEG C for 20-24h.

6. The method for preparing a skin-friendly nylon knitted fabric with antibacterial properties according to claim 1, characterized in that, In the step (2), the mass ratio of the modified fiber intermediate and HBr aqueous solution is 1: (80-100); when preparing the intermediate product, the reaction condition is that the reaction is carried out at room temperature for 2-4h at a rotation speed of 110-130r / min.

7. The method for preparing a skin-friendly nylon knitted fabric with antibacterial properties according to claim 1, characterized in that, In the step (2), the mass ratio of the intermediate product and KMnO4 aqueous solution is 1: (80-100); when preparing the modified nylon 66 fiber, the reaction condition is that the reaction is carried out at room temperature for 1-2h at a rotation speed of 110-130r / min.

8. The method for preparing a skin-friendly nylon knitted fabric with antibacterial properties according to claim 1, characterized in that, In the step (2), the concentration of the HBr aqueous solution is 0.4wt%; the concentration of the KMnO4 aqueous solution is 1mol / L.

9. The method of claim 1, wherein the method further comprises the steps of: washing the knitted fabric with water; and drying the knitted fabric. In the step (3), the yarn count is 40-60 S in the preparation of the surface layer knitted fabric and the inner layer knitted fabric, the weight of the surface layer knitted fabric is 80-100 g / m 2 , and the weight of the inner layer knitted fabric is 60-80 g / m 2 .

10. A skin-friendly anti-bacterial knitted fabric of polyamide prepared by the method according to any one of claims 1 to 9.

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