Pure natural plant antibacterial knitting yarn and production process thereof

Abstract

The invention discloses a pure natural plant antibacterial knitting yarn and a production process thereof. The production process comprises the following steps: S1, treating the knitting yarn with an amino silane coupling agent; s2, the amino silane coupling agent modified knitting yarn is placed in the graphene oxide dispersion liquid, then dimethylaminopyridine is added, the temperature is increased to 45-55 DEG C for ultrasonic treatment, and then washing and vacuum drying are conducted; s3, the graphene oxide modified knitting yarn is placed in the plant antibacterial agent / chitosan treating fluid, ultrasonic treatment is conducted at the temperature of 50-55 DEG C, and primary rolling is conducted; then placing in a plant antibacterial agent / chitosan treatment solution, carrying out ultrasonic treatment at 50-55 DEG C, and carrying out secondary rolling; and baking, washing with water, and drying to obtain the product. The antibacterial knitting yarn prepared through the technology is good in antibacterial effect, safe, environmentally friendly and capable of resisting bacteria for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a pure natural plant antibacterial knitting yarn and a production process thereof. Background Art

[0002] Knitting yarn is made of different types of fiber materials (such as cotton, linen, wool, silk, chemical fiber, etc.) through processing, twisting and other processes. It is used for hand or machine knitting into clothing, household items and other crafts. Knitting yarn is generally fluffy, soft, smooth, less hairy, and has greater extensibility and elasticity.

[0003] In daily life, knitted yarn products (such as clothing, bedding, etc.) are exposed to sweat, secretions, etc., providing a warm and moist growth environment for bacteria, and bacterial growth is often accompanied by the generation of odor. With the continuous development of the times, knitted products with good antibacterial properties have received widespread attention. Antibacterial treatment of knitted yarn can effectively inhibit bacterial growth, reduce health risks, and effectively reduce odor, keeping knitted yarn products fresh.

[0004] Therefore, how to improve the antibacterial properties of knitted yarns has attracted more and more attention. At present, when improving the antibacterial properties of knitted yarns, antibacterial agents are usually added to the yarns. Although most antibacterial agents are harmless to the human body under normal use conditions, some antibacterial agents still have toxicity problems and may pose a potential threat to human health. In view of this, if pure natural plant antibacterial agents are used to treat knitted yarns with antibacterial agents, the safety and environmental protection of the antibacterial treatment can be effectively guaranteed.

[0005] At present, there is a technology that uses plant antimicrobial agents to treat yarns, including soaking the yarn in a solution containing the plant antimicrobial agent, and then squeezing out the excess solution by rolling to allow the antimicrobial agent to penetrate into the yarn fibers. However, the antimicrobial knitting yarn treated by this method will have a significantly reduced effect after multiple washings, and in general, the antimicrobial effect of pure natural plant antimicrobial agents is limited. Summary of the invention

[0006] The purpose of the present invention is to provide a pure natural plant antibacterial knitting yarn and a production process thereof. The antibacterial knitting yarn prepared by the process of the present invention has good antibacterial effect, is safe and environmentally friendly, and can be durable in antibacterial effect.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1, treating the knitting yarn with an aminosilane coupling agent to obtain the aminosilane coupling agent modified knitting yarn; S2, placing the aminosilane coupling agent modified knitting yarn in a graphene oxide dispersion, adding dimethylaminopyridine, heating to 45-55° C. and ultrasonically treating for 2-5 hours, then taking out the treated knitting yarn, washing it with water, and vacuum drying it to obtain graphene oxide modified knitting yarn; S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 50-55°C for 15-20 minutes, and then roll it once, with a rolling rate of 80-85%; place it in a plant antibacterial agent / chitosan treatment solution again, ultrasonically treat it at 50-55°C for 10-15 minutes, and then roll it twice, with a rolling rate of 85-90%; bake it at 110-120°C for 4-5 minutes, wash it with water, and dry it to obtain pure natural plant antibacterial knitting yarn.

[0008] Preferably, in step S2, the mass concentration of the graphene oxide dispersion is 2-5 mg / mL; the mass volume ratio of the aminosilane coupling agent modified knitting yarn to the graphene oxide dispersion is 1 g: 20-40 mL; and the power of the ultrasonic treatment is 100-300 W.

[0009] Preferably, in step S2, the amount of dimethylaminopyridine added is 0.01-0.05% of the mass of graphene oxide.

[0010] Preferably, in step S3, the mass volume ratio of the graphene oxide modified knitting yarn to the plant antibacterial agent / chitosan treatment solution is 1g:20~25mL; in the plant antibacterial agent / chitosan treatment solution, the concentration of the plant antibacterial agent is 20~50g / L, and the concentration of chitosan is 3~5g / L.

[0011] Preferably, in step S3, the method for preparing the plant antimicrobial agent / chitosan treatment solution comprises the following steps: adding chitosan to an acetic acid solution having a mass fraction of 1 to 1.5%, stirring and mixing to dissolve, to obtain a chitosan solution; adding a plant antimicrobial agent to the chitosan solution, stirring and mixing, to obtain the plant antimicrobial agent / chitosan treatment solution; In step S3, the power of the ultrasonic treatment is 500-1000W.

[0012] Preferably, the pure natural plant antibacterial agent is one or more of turmeric extract, wormwood extract, and green tea extract.

[0013] Preferably, step S1 specifically includes the following steps: mixing ethanol and water, adding an aminosilane coupling agent, and then adding knitting yarn, heating to 50-60°C, ultrasonically treating for 5-8h, then taking out, and placing at 60-70°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; the amount of the aminosilane coupling agent added is 1.5-3% of the mass of the knitting yarn.

[0014] Preferably, the aminosilane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β (aminoethyl)-γ-aminopropyltrimethoxysilane, and N-β (aminoethyl)-γ-aminopropyltriethoxysilane.

[0015] Preferably, in step S1, the knitting yarn includes one or more of plant cotton yarn, ramie yarn, ramie yarn, hemp yarn, bamboo fiber yarn, wool yarn, polyester yarn, nylon yarn, acrylic yarn, polyester / cotton blended yarn, and cotton / linen blended yarn.

[0016] As a general inventive concept, the present invention provides a pure natural plant antibacterial knitting yarn prepared by the production process of the above-mentioned pure natural plant antibacterial knitting yarn.

[0017] The beneficial effects of the present invention are: When preparing pure natural plant antibacterial knitting yarns according to the present invention, the knitting yarns are first modified by using an aminosilane coupling agent, and then immersed in a graphene oxide dispersion, graphene oxide (rich in oxygen-containing groups; such as carboxyl groups) and amino groups on the surface of the knitting yarns undergo an amidation reaction, so that graphene oxide with a layered structure is firmly coated on the surface of the knitting yarns. On this basis, the graphene oxide-modified knitting yarns are subsequently placed in a plant antibacterial agent / chitosan treatment solution for ultrasonic treatment, so that the plant antibacterial agent and chitosan can penetrate into the layered structure of graphene oxide, and after subsequent drying, combined with the characteristics of chitosan, the plant antibacterial agent can be stabilized in the layered structure of graphene oxide, and even if the knitting yarns are subsequently washed, the plant antibacterial agent still maintains a high loading amount in the graphene oxide, which can effectively ensure the antibacterial effect.

[0018] In addition, in addition to the antibacterial effect of the plant antibacterial agent, the graphene oxide and chitosan loaded on the knitting yarn of the present invention also have excellent antibacterial effects, especially graphene oxide, which has antibacterial properties against various bacteria, viruses and fungi, and has a long-lasting antibacterial effect. After being combined with the plant antibacterial agent, the antibacterial knitting yarn can show a very good antibacterial effect. In addition, the graphene oxide, plant antibacterial agent and chitosan in the present invention have no obvious toxic effects on human cells, and are overall safe and environmentally friendly. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the following embodiments of the present invention, wormwood extract and green tea extract are used, wherein the preparation method of wormwood extract is as follows: The preparation method of wormwood extract comprises the following steps: crushing dry wormwood, adding water with a mass 15 times of the dry wormwood, heating to 100°C for extraction for 2 hours, filtering, concentrating the obtained filtrate under reduced pressure, and spray drying to obtain the wormwood extract.

[0021] The preparation method of green tea extract comprises the following steps: crushing dry wormwood, adding it into water with a mass 15 times of that of wormwood, heating it to 100°C for extraction for 1.5h, filtering, concentrating the obtained filtrate under reduced pressure, spray drying, and obtaining the green tea extract.

[0022] The preparation method of the graphene oxide dispersion comprises the following steps: adding graphene oxide to deionized water, and ultrasonically dispersing for 2 hours to obtain the graphene oxide dispersion.

[0023] In the following embodiments, the knitting yarn used is a polyester / cotton blended yarn with a composition of polyester 65 / cotton 35 and a yarn count of 21Ne.

[0024] Embodiment 1: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 60°C, ultrasonically treat for 7 hours, the power of ultrasonic treatment is 200W, then take out, and place at 60°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 2% of the mass of the knitting yarn; the mass ratio of knitting yarn to the ethanol-water mixture is 1:15.

[0025] S2. Place the knitting yarn modified by aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 3.5 mg / mL, add dimethylaminopyridine, heat to 50°C and perform ultrasonic treatment for 3 hours at a power of 300 W, then take out the treated knitting yarn, wash it with water, and vacuum dry it to obtain the graphene oxide modified knitting yarn; wherein the mass volume ratio of the knitting yarn modified by aminosilane coupling agent to the graphene oxide dispersion is 1 g:30 mL, and the amount of dimethylaminopyridine added is 0.03% of the mass of graphene oxide.

[0026] S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 55°C for 20 minutes, and the power of the ultrasonic treatment is 800 W; then roll it once, and the rolling rate is 85%; then place it in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 55°C for 15 minutes, and the power of the ultrasonic treatment is 800 W, then roll it twice, and the rolling rate is 87%; then bake it at 120°C for 4 minutes, and then wash and dry it to obtain pure natural plant antibacterial knitting yarn.

[0027] The preparation method of the plant antibacterial agent / chitosan treatment liquid comprises the following steps: adding chitosan to an acetic acid solution with a mass fraction of 1%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antibacterial agent to the chitosan solution, stirring and mixing, and obtaining the plant antibacterial agent / chitosan treatment liquid. In the plant antibacterial agent / chitosan treatment liquid, the concentration of the plant antibacterial agent is 30g / L, and the concentration of chitosan is 4g / L; the plant antibacterial agent is composed of wormwood extract and green tea extract in a mass ratio of 1:1.

[0028] Embodiment 2: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 55°C, ultrasonically treat for 7 hours, the power of ultrasonic treatment is 200W, then take out, and place at 70°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 2% of the mass of the knitting yarn; the mass ratio of knitting yarn to the ethanol-water mixture is 1:15.

[0029] S2. Place the knitting yarn modified by aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 5 mg / mL, add dimethylaminopyridine, heat to 55°C and perform ultrasonic treatment for 2 hours. The power of ultrasonic treatment is 300 W, then take out the treated knitting yarn, wash it with water, and vacuum dry it to obtain the graphene oxide modified knitting yarn; wherein the mass volume ratio of the knitting yarn modified by aminosilane coupling agent to the graphene oxide dispersion is 1 g:20 mL, and the amount of dimethylaminopyridine added is 0.05% of the mass of graphene oxide.

[0030] S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 52°C for 18 minutes, and the power of the ultrasonic treatment is 1000 W; then roll it once, and the rolling rate is 84%; then place it in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 52°C for 12 minutes, and the power of the ultrasonic treatment is 1000 W, then roll it twice, and the rolling rate is 86%; then bake it at 115°C for 5 minutes, and then wash and dry it to obtain pure natural plant antibacterial knitting yarn.

[0031] The preparation method of the plant antibacterial agent / chitosan treatment liquid comprises the following steps: adding chitosan to an acetic acid solution with a mass fraction of 1.5%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antibacterial agent to the chitosan solution, stirring and mixing, and obtaining the plant antibacterial agent / chitosan treatment liquid. In the plant antibacterial agent / chitosan treatment liquid, the concentration of the plant antibacterial agent is 50g / L, and the concentration of chitosan is 4g / L; the plant antibacterial agent is composed of wormwood extract and green tea extract in a mass ratio of 1:1.

[0032] Embodiment 3: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 57°C, ultrasonically treat for 7 hours, the power of ultrasonic treatment is 200 W, then take out, and place at 63°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 2.5% of the mass of the knitting yarn; the mass ratio of knitting yarn to the ethanol-water mixture is 1:15.

[0033] S2. Place the knitting yarn modified by aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 3 mg / mL, add dimethylaminopyridine, heat to 48°C and perform ultrasonic treatment for 3.5 hours at a power of 200 W, then take out the treated knitting yarn, wash it with water, and vacuum dry it to obtain the graphene oxide modified knitting yarn; wherein the mass volume ratio of the knitting yarn modified by aminosilane coupling agent to the graphene oxide dispersion is 1 g:35 mL, and the amount of dimethylaminopyridine added is 0.02% of the mass of graphene oxide.

[0034] S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 50°C for 20 minutes, and the power of the ultrasonic treatment is 600 W; then roll it once, and the rolling rate is 82%; then place it in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 50°C for 10 minutes, and the power of the ultrasonic treatment is 600 W, then roll it twice, and the rolling rate is 88%; then bake it at 115°C for 4 minutes, and then wash and dry it to obtain pure natural plant antibacterial knitting yarn.

[0035] The preparation method of a plant antibacterial agent / chitosan treatment liquid comprises the following steps: adding chitosan to an acetic acid solution with a mass fraction of 1 to 1.5%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antibacterial agent to the chitosan solution, stirring and mixing, and obtaining the plant antibacterial agent / chitosan treatment liquid. In the plant antibacterial agent / chitosan treatment liquid, the concentration of the plant antibacterial agent is 50 g / L, and the concentration of chitosan is 5 g / L; the plant antibacterial agent is composed of wormwood extract and green tea extract in a mass ratio of 1:1.

[0036] Embodiment 4: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 50°C, ultrasonically treat for 6 hours, the power of ultrasonic treatment is 200 W, then take out, and place at 70°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 1.5% of the mass of the knitting yarn; the mass ratio of knitting yarn to the ethanol-water mixture is 1:15.

[0037] S2. Place the knitting yarn modified by aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 3.5 mg / mL, add dimethylaminopyridine, heat to 55°C and perform ultrasonic treatment for 2 hours. The power of ultrasonic treatment is 100 W, then take out the treated knitting yarn, wash it with water, and vacuum dry it to obtain the graphene oxide modified knitting yarn; wherein the mass volume ratio of the knitting yarn modified by aminosilane coupling agent to the graphene oxide dispersion is 1 g:35 mL, and the amount of dimethylaminopyridine added is 0.03% of the mass of graphene oxide.

[0038] S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 52°C for 15 minutes, and the power of the ultrasonic treatment is 1000 W; then roll it once, and the rolling rate is 80%; then place it in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 52°C for 13 minutes, and the power of the ultrasonic treatment is 1000 W, and then roll it twice, and the rolling rate is 90%; then bake it at 110°C for 4.5 minutes, and then wash and dry it to obtain pure natural plant antibacterial knitting yarn.

[0039] The preparation method of the plant antibacterial agent / chitosan treatment liquid comprises the following steps: adding chitosan to an acetic acid solution with a mass fraction of 1.5%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antibacterial agent to the chitosan solution, stirring and mixing, and obtaining the plant antibacterial agent / chitosan treatment liquid. In the plant antibacterial agent / chitosan treatment liquid, the concentration of the plant antibacterial agent is 40g / L, and the concentration of chitosan is 5g / L; the plant antibacterial agent is composed of wormwood extract and green tea extract in a mass ratio of 1:1.

[0040] Embodiment 5: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 60°C, ultrasonically treat for 5 hours, the power of ultrasonic treatment is 200W, then take out, and place at 65°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 2.5% of the mass of the knitting yarn; the mass ratio of knitting yarn to the ethanol-water mixture is 1:15.

[0041] S2. Place the knitting yarn modified by aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 5 mg / mL, add dimethylaminopyridine, heat to 45°C and perform ultrasonic treatment for 5 hours. The power of ultrasonic treatment is 200 W, then take out the treated knitting yarn, wash it with water, and vacuum dry it to obtain the graphene oxide modified knitting yarn; wherein the mass volume ratio of the knitting yarn modified by aminosilane coupling agent to the graphene oxide dispersion is 1 g:20 mL, and the amount of dimethylaminopyridine added is 0.01% of the mass of graphene oxide.

[0042] S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 50°C for 20 minutes, and the power of the ultrasonic treatment is 500W; then roll it once, and the rolling rate is 85%; then place it in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 50°C for 13 minutes, and the power of the ultrasonic treatment is 500W, then roll it twice, and the rolling rate is 88%; then bake it at 120°C for 4 minutes, and then wash and dry it to obtain pure natural plant antibacterial knitting yarn.

[0043] The preparation method of the plant antibacterial agent / chitosan treatment liquid comprises the following steps: adding chitosan to an acetic acid solution with a mass fraction of 1.2%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antibacterial agent to the chitosan solution, stirring and mixing, and obtaining the plant antibacterial agent / chitosan treatment liquid. In the plant antibacterial agent / chitosan treatment liquid, the concentration of the plant antibacterial agent is 20g / L, and the concentration of chitosan is 3g / L; the plant antibacterial agent is composed of wormwood extract and green tea extract in a mass ratio of 1:1.

[0044] Embodiment 6: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 55°C, ultrasonically treat for 8 hours, the power of ultrasonic treatment is 200 W, then take out, and place at 60°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 3% of the mass of the knitting yarn; the mass ratio of knitting yarn to ethanol-water mixture is 1:15.

[0045] S2. Place the knitting yarn modified by aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 2 mg / mL, add dimethylaminopyridine, heat to 50°C and perform ultrasonic treatment for 3 hours at a power of 200 W, then take out the treated knitting yarn, wash it with water, and vacuum dry it to obtain the graphene oxide modified knitting yarn; wherein the mass volume ratio of the knitting yarn modified by aminosilane coupling agent to the graphene oxide dispersion is 1 g:40 mL, and the amount of dimethylaminopyridine added is 0.05% of the mass of graphene oxide.

[0046] S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 55°C for 18 minutes, and the power of the ultrasonic treatment is 800 W; then roll it once, and the rolling rate is 82%; then place it in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 55°C for 10 minutes, and the power of the ultrasonic treatment is 800 W, then roll it twice, and the rolling rate is 85%; then bake it at 115°C for 5 minutes, and then wash and dry it to obtain pure natural plant antibacterial knitting yarn.

[0047] The preparation method of the plant antibacterial agent / chitosan treatment liquid comprises the following steps: adding chitosan to an acetic acid solution with a mass fraction of 1.2%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antibacterial agent to the chitosan solution, stirring and mixing, and obtaining the plant antibacterial agent / chitosan treatment liquid. In the plant antibacterial agent / chitosan treatment liquid, the concentration of the plant antibacterial agent is 50g / L, and the concentration of chitosan is 4g / L; the plant antibacterial agent is composed of wormwood extract and green tea extract in a mass ratio of 1:1.

[0048] Comparative Example 1: A production process of pure natural plant antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 60°C, ultrasonically treat for 7 hours, the power of ultrasonic treatment is 200W, then take out, and place at 60°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 2% of the mass of the knitting yarn; the mass ratio of knitting yarn to the ethanol-water mixture is 1:15.

[0049] S3. Place the aminosilane coupling agent modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, and ultrasonically treat it at 55°C for 20 minutes with a power of 800 W; then roll it once, and the rolling rate is 85%; then place it in a plant antibacterial agent / chitosan treatment solution, and ultrasonically treat it at 55°C for 15 minutes with a power of 800 W; then roll it twice, and the rolling rate is 87%; then bake it at 120°C for 4 minutes, and then wash and dry it to obtain pure natural plant antibacterial knitting yarn.

[0050] The preparation method of the plant antibacterial agent / chitosan treatment liquid comprises the following steps: adding chitosan to an acetic acid solution with a mass fraction of 1%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antibacterial agent to the chitosan solution, stirring and mixing, and obtaining the plant antibacterial agent / chitosan treatment liquid. In the plant antibacterial agent / chitosan treatment liquid, the concentration of the plant antibacterial agent is 30g / L, and the concentration of chitosan is 4g / L; the plant antibacterial agent is composed of wormwood extract and green tea extract in a mass ratio of 1:1.

[0051] Comparative Example 2: A production process for pure natural plant antibacterial knitting yarn, which is different from Example 1 in that step S2 includes the following steps: placing knitting yarn modified by an aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 3.5 mg / mL, adding dimethylaminopyridine, stirring at room temperature for 3 hours, and a stirring speed of 60 r / min, then taking out the treated knitting yarn, washing it with water, and vacuum drying it to obtain graphene oxide modified knitting yarn; wherein the mass volume ratio of the knitting yarn modified by the aminosilane coupling agent to the graphene oxide dispersion is 1 g:30 mL, and the amount of dimethylaminopyridine added is 0.03% of the mass of the graphene oxide.

[0052] Comparative Example 3: A production process for antibacterial knitting yarn comprises the following steps: S1. Mix ethanol and water in a volume ratio of 5:1 to obtain an ethanol-water mixture, add γ-aminopropyltriethoxysilane, and then add knitting yarn, heat to 60°C, ultrasonically treat for 7 hours, the power of ultrasonic treatment is 200W, then take out, and place at 60°C for vacuum drying to obtain aminosilane coupling agent modified knitting yarn; wherein, the amount of aminosilane coupling agent added is 2% of the mass of the knitting yarn; the mass volume ratio of the knitting yarn to the ethanol-water mixture is 1:15.

[0053] S2. Place the knitting yarn modified by aminosilane coupling agent in a graphene oxide dispersion with a mass concentration of 3.5 mg / mL, add dimethylaminopyridine, heat to 50°C and perform ultrasonic treatment for 3 hours. The power of ultrasonic treatment is 300 W, then take out the treated knitting yarn, wash it with water, and vacuum dry it to obtain antibacterial knitting yarn; wherein the mass volume ratio of the knitting yarn modified by aminosilane coupling agent to the graphene oxide dispersion is 1 g:30 mL, and the amount of dimethylaminopyridine added is 0.03% of the mass of graphene oxide.

[0054] Antibacterial performance test: According to GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", the pure natural plant antibacterial knitted yarns in Examples 1 to 6 and Comparative Examples 1 to 3 were tested for antibacterial bacteria, Staphylococcus aureus, Escherichia coli, and Candida albicans, and then washed 5 times and tested again for antibacterial bacteria. The specific test results are shown in Table 1.

[0055] Table 1 Antibacterial performance test results

[0056] As shown in Table 1, the knitting yarns in Examples 1 to 6 have excellent antibacterial properties, and still have high antibacterial properties after washing. By comparing Example 1 and Comparative Example 1, it can be seen that if graphene oxide is not used to modify the knitting yarn, the antibacterial properties of the knitting yarn are significantly reduced, especially after washing. By comparing Example 1 and Comparative Example 2, it can be seen that when graphene oxide is used to modify the knitting yarn, if the temperature is changed and ultrasonic treatment is not performed, the performance will also be reduced. By comparing Example 1 and Comparative Example 3, it can be seen that if the knitting yarn is not treated with a plant antibacterial agent / chitosan treatment solution, its antibacterial properties will be reduced. It can be seen that graphene oxide cooperates with plant antibacterial agents and chitosan to effectively increase the antibacterial properties of the knitting yarn.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A production process of pure natural plant antibacterial knitting yarn, characterized in that: The following steps are involved: S1, treating the knitting yarn with an aminosilane coupling agent to obtain the aminosilane coupling agent modified knitting yarn; S2, placing the aminosilane coupling agent modified knitting yarn in a graphene oxide dispersion, adding dimethylaminopyridine, heating to 45-55° C. and ultrasonically treating for 2-5 hours, then taking out the treated knitting yarn, washing it with water, and vacuum drying it to obtain graphene oxide modified knitting yarn; S3. Place the graphene oxide modified knitting yarn in a plant antibacterial agent / chitosan treatment solution, ultrasonically treat it at 50-55°C for 15-20 minutes, and then roll it once, with a rolling rate of 80-85%; place it in a plant antibacterial agent / chitosan treatment solution again, ultrasonically treat it at 50-55°C for 10-15 minutes, and then roll it twice, with a rolling rate of 85-90%; bake it at 110-120°C for 4-5 minutes, wash it with water, and dry it to obtain pure natural plant antibacterial knitting yarn.

2. The production process of pure natural plant antibacterial knitting yarn according to claim 1, characterized in that: In step S2, the mass concentration of the graphene oxide dispersion is 2-5 mg / mL; the mass volume ratio of the aminosilane coupling agent modified knitting yarn to the graphene oxide dispersion is 1 g: 20-40 mL; and the power of the ultrasonic treatment is 100-300 W.

3. The production process of pure natural plant antibacterial knitting yarn according to claim 1, characterized in that: In step S2, the amount of dimethylaminopyridine added is 0.01-0.05% of the mass of graphene oxide.

4. The production process of pure natural plant antibacterial knitting yarn according to claim 1, characterized in that: In step S3, the mass volume ratio of the graphene oxide modified knitting yarn to the plant antibacterial agent / chitosan treatment solution is 1g:20~25mL; in the plant antibacterial agent / chitosan treatment solution, the concentration of the plant antibacterial agent is 20~50g / L, and the concentration of chitosan is 3~5g / L.

5. The production process of pure natural plant antibacterial knitting yarn according to claim 4, characterized in that: In step S3, the method for preparing the plant antimicrobial agent / chitosan treatment solution comprises the following steps: adding chitosan to an acetic acid solution having a mass fraction of 1 to 1.5%, stirring and mixing to dissolve, and obtaining a chitosan solution; adding a plant antimicrobial agent to the chitosan solution, stirring and mixing, and obtaining the plant antimicrobial agent / chitosan treatment solution; In step S3, the power of the ultrasonic treatment is 500-1000W.

6. The production process of pure natural plant antibacterial knitting yarn according to claim 4, characterized in that: The pure natural plant antibacterial agent is one or more of turmeric extract, wormwood extract and green tea extract.

7. The production process of the pure natural plant antibacterial knitting yarn according to any one of claims 1 to 6, characterized in that: Step S1 specifically includes the following steps: mixing ethanol and water, adding an aminosilane coupling agent, and then adding knitted yarn, heating to 50-60°C, ultrasonically treating for 5-8h, then taking out, and placing at 60-70°C for vacuum drying to obtain aminosilane coupling agent modified knitted yarn; the amount of the aminosilane coupling agent added is 1.5-3% of the mass of the knitted yarn.

8. The production process of pure natural plant antibacterial knitting yarn according to claim 7, characterized in that: The aminosilane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β (aminoethyl)-γ-aminopropyltrimethoxysilane and N-β (aminoethyl)-γ-aminopropyltriethoxysilane.

9. The production process of the pure natural plant antibacterial knitting yarn according to any one of claims 1 to 6, characterized in that: In step S1, the knitting yarn includes one or more of plant cotton yarn, ramie yarn, ramie yarn, hemp yarn, bamboo fiber yarn, wool yarn, polyester yarn, nylon yarn, acrylic yarn, polyester / cotton blended yarn, and cotton / linen blended yarn.

10. A pure natural plant antibacterial knitting yarn prepared by the production process of the pure natural plant antibacterial knitting yarn according to any one of claims 1 to 9.

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