WO2023082137A1 - Flame-retardant and abrasion-resistant antibacterial yarn and production process therefor - Google Patents

Abstract

A flame-retardant and abrasion-resistant antibacterial yarn. The flame-retardant and abrasion-resistant antibacterial yarn is obtained by uniformly mixing a modified carbon fiber and a skin-friendly fiber according to a certain weight ratio and spinning a basic yarn from same, and performing surface treatment on the basic yarn by means of a coating solution. A fabric made of the yarn is soft and skin-friendly. The coating solution is prepared by mixing polyvinyl alcohol and chitosan, and achieves good flame-retardant and antibacterial effects. The coating effect of the coating solution can enhance bundling of fibers, thereby improving the abrasion resistance of the yarn. The modified carbon fiber is prepared by using a carbon fiber as a raw material, enabling the carbon fiber to adsorb calcium hydroxide, then generating calcium acetate by means of a hydrolysis reaction of ethyl acetate and calcium hydroxide to improve the roughness of the surface of the carbon fiber and also improve to a certain extent the hydrophilicity of the carbon fiber, and finally, uniformly attaching a surface-modified nano-inorganic antibacterial particle to the surface of the carbon fiber by using polyurethane as an adhesive to make the carbon fiber have good antibacterial and bacteriostatic effects.

Description

A flame-retardant and wear-resistant antibacterial yarn and its production process technical field

The invention belongs to the technical field of textiles, and in particular relates to a flame-retardant and wear-resistant antibacterial yarn and a production process thereof.

Background technique

Yarn is a kind of textile, which is processed into products of a certain fineness with various textile fibers. It is used for weaving, rope making, thread making, knitting and embroidery, etc. With the improvement of the level, people's demand for the function of fabric is no longer just for keeping warm. According to the different scope of use, people hope that the fabric has corresponding functions, which can be realized by modifying the raw material of the fabric-yarn.

As a flammable material, in order to ensure its safe use, it needs to be modified to make the fabric have good flame retardant performance. However, in the prior art, after the fiber and fabric are modified, the fiber and fabric will be damaged. The hardness becomes higher and the softness becomes worse. Do not take advantage of the widespread use of this type of fabric. Similarly, when natural fibers such as cotton fibers are used, their strength is poor, and they can be decomposed as raw materials for the growth of microorganisms and become a breeding ground for microorganisms. Therefore, fabrics and fibers with antibacterial and antibacterial effects are also widely used materials. In order to solve the above problems, a flame-resistant and wear-resistant antibacterial yarn and its production process are provided. The present invention provides the following technical solutions.

Contents of the invention

The object of the present invention is to provide a kind of flame-retardant and wear-resistant antibacterial yarn and its production process.

The technical problem to be solved in the present invention is:

As a flammable material, in order to ensure its safe use, it needs to be modified to make the fabric have good flame retardant performance. However, in the prior art, after the fiber and fabric are modified, the fiber and fabric will be damaged. The hardness becomes higher and the softness becomes worse. Do not take advantage of the widespread use of this type of fabric. Similarly, when natural fibers such as cotton fibers are used, their strength is poor, and they can be decomposed as raw materials for the growth of microorganisms and become a breeding ground for microorganisms. Therefore, fabrics and fibers with antibacterial and antibacterial effects are also widely used materials.

The purpose of the present invention can be achieved through the following technical solutions:

A flame-retardant and wear-resistant antibacterial yarn, comprising the following raw materials in parts by weight: 0.8-2 parts of modified carbon fiber, 7-9 parts of skin-friendly fiber;

The skin-friendly fiber comprises one or a mixture of two random ratios of cotton fiber and hemp fiber;

The preparation method of the above-mentioned flame-retardant and wear-resistant antibacterial yarn is:

Step 1, preparing modified carbon fibers;

Step 2, weighing the skin-friendly fiber;

Step 3, after uniformly mixing the modified carbon fiber and the skin-friendly fiber according to the weight ratio, spinning to obtain the basic yarn;

Step 4, first preparing an aqueous solution of polyvinyl alcohol with a mass concentration of 3%-5%, and then preparing an aqueous solution of chitosan with a mass concentration of 5%-7%, the degree of deacetylation of chitosan is greater than or equal to 90%, and the polyethylene Alcohol aqueous solution and chitosan aqueous solution according to the weight ratio of 1:0.6-1.2, stirring and dispersing at a speed of 240-600r/min for 40-60min, and vacuum defoaming to obtain a mixed solution; after heating the mixed solution to 75-85°C , adding montmorillonite thereto, and then mixing and stirring for 1.5-2.5h under the condition of a rotating speed of 400-600r/min to obtain a coating solution, wherein the weight ratio of montmorillonite to the mixed solution is 1:3-5;

Step 5: After soaking the base yarn in the coating solution for 15-30s, filter and add the yarn into the solidification solution, soak for 20-30min at a temperature of 25-40°C, rinse with deionized water, and Dry at a temperature of 45-70°C to obtain a flame-retardant and wear-resistant antibacterial yarn.

The solidified liquid is prepared by uniformly mixing water, formaldehyde, concentrated sulfuric acid with a mass fraction of 98.3% and sodium sulfate according to a weight ratio of 1:0.1-0.3:0.03-0.1:0.02-0.04;

The flame-retardant and wear-resistant antibacterial yarn of the present invention is obtained by uniformly mixing and spinning modified carbon fiber and skin-friendly fiber according to a certain weight ratio, and surface-treating the base yarn through a coating solution, wherein the skin-friendly The addition of fibers can reduce the use of plastic fibers, making the fibers degradable, and the fabric made from the yarn is soft and skin-friendly, and the coating liquid is made by mixing polyvinyl alcohol and chitosan, in which polyvinyl alcohol and chitosan Chitosan molecules can be hydrogen bonded, so that the two can be uniformly dispersed, and both chitosan and montmorillonite in the coating solution can play a good flame retardant effect, and chitosan has antibacterial effect, Moreover, the coating effect of the coating liquid can improve the bundling properties of the fibers, thereby improving the wear resistance of the yarn;

The preparation method of described modified carbon fiber is:

S1. Surface-treat the nano-inorganic antibacterial particles with a silane coupling agent, and obtain surface-modified nano-inorganic antibacterial particles for use after drying;

The nano-inorganic antibacterial particles include one or at least two of nano-zinc oxide, nano-silver oxide and nano-titanium dioxide in any ratio;

The silane coupling agent is one of KH550, KH560, KH570, KH792, DL602 and DL171 or a mixture of at least two in any ratio;

S2. Add carbon fiber to the mixture of ethanol and water in any ratio, and treat it for 20-30min at a temperature of 40-60°C and a frequency of 60-160KHz, and then dry it in a vacuum drying oven at a temperature of 90-120°C 2 After -3h, roast at 650-720°C for 1-3h in a nitrogen atmosphere to obtain pretreated carbon fibers. soluble impurities, and then baked at high temperature after drying to remove active groups on the surface of carbon fibers;

S3. Add the pretreated carbon fiber prepared in step S2 into a saturated calcium hydroxide solution for soaking for 24-36 hours, filter and dry in a vacuum drying oven at a temperature of 105-125°C, and then raise the temperature to 300-450°C Activation treatment for 1-1.5h, naturally cooled to room temperature;

S4. Add the pretreated carbon fibers obtained in step S3 into the ethyl acetate solution, disperse and soak at 25-35°C for 30-48h, filter and separate, and hydrolyze under vacuum at 70-90°C 12-24h, after cooling to room temperature, purging with nitrogen for 1.5-4h, and then vacuum drying at 105-125°C for 8-24h to obtain surface-modified carbon fibers;

In this step, the pretreated carbon fiber is first added to a saturated calcium hydroxide solution, and the calcium hydroxide is adsorbed by the carbon fiber, and then the calcined pretreated carbon fiber is added to the ethyl acetate solution, so that the pretreated carbon fiber absorbs ethyl acetate , and finally use the hydrolysis reaction of ethyl acetate and calcium hydroxide to generate calcium acetate, improve the roughness of the carbon fiber surface, and at the same time improve the hydrophilicity of the carbon fiber to a certain extent;

S5, the preparation mass concentration is the polyvinyl alcohol aqueous solution of 1.3%-2%, then adds the surface-modified nano-inorganic antibacterial particles prepared in step S1, ultrasonic treatment 10-14min under the condition of 80-130KHz, obtains surface modification Proper nano-inorganic antibacterial particle dispersion, and then prepare a certain concentration of polyurethane emulsion, under the condition that the rotation speed is 400-600r/min, the surface-modified nano-inorganic antibacterial particle dispersion is stirred, and during the stirring process, slowly Slowly add the polyurethane emulsion, after the polyurethane emulsion is completely added, ultrasonically treat for 20-25min under the condition of 80-160KHz, and then stir for 30-50min under the condition of rotating speed 800-2600r/min to obtain the surface treatment liquid;

The mass concentration of surface-modified nano inorganic antibacterial particles in the surface treatment solution is 1.2-6.7g/L;

S6. Add the carbon fiber prepared in step S4 into the surface treatment solution, dip it for 15-20 hours at a temperature of 40-55° C., take out the carbon fiber, and dry it until dry at a temperature of 65-70° C. , to obtain modified carbon fiber;

In this step, first prepare a certain concentration of polyvinyl alcohol aqueous solution, then add surface-modified nano-inorganic antibacterial particles to it, stir and disperse to obtain a surface-modified nano-inorganic antibacterial particle dispersion, and then add polyurethane emulsion to it, Under stirring and ultrasonic conditions, the polyurethane particles in the polyurethane emulsion are wrapped on the surface of the surface-modified nano-inorganic antibacterial particles to obtain a surface treatment solution. Finally, through immersion and drying, the surface-modified nano-inorganic antibacterial particles are coated with polyurethane as an adhesive. The particles are evenly attached to the surface of the carbon fiber, so that the carbon fiber has a good antibacterial and antibacterial effect. wear-resistant properties.

Beneficial effects of the present invention:

The flame-retardant and wear-resistant antibacterial yarn of the present invention is obtained by uniformly mixing and spinning modified carbon fiber and skin-friendly fiber according to a certain weight ratio, and surface-treating the base yarn through a coating solution, wherein the skin-friendly The addition of fibers can reduce the use of plastic fibers, making the fibers degradable, and the fabric made from the yarn is soft and skin-friendly, and the coating liquid is made by mixing polyvinyl alcohol and chitosan, in which polyvinyl alcohol and chitosan Chitosan molecules can be hydrogen bonded, so that the two can be uniformly dispersed, and both chitosan and montmorillonite in the coating solution can play a good flame retardant effect, and chitosan has antibacterial effect, Moreover, the coating effect of the coating liquid can improve the bundleability of the fibers, thereby improving the wear resistance of the yarn. The modified carbon fiber is made of carbon fiber. First, the carbon fiber is added to the mixed solution of ethanol and water , heated and ultrasonically treated to remove soluble impurities on the surface of carbon fibers, and then baked at high temperature after drying to remove active groups on the surface of carbon fibers to obtain pretreated carbon fibers. Add pretreated carbon fibers to saturated calcium hydroxide solution and pass through carbon fibers Adsorb calcium hydroxide, and then add the calcined pretreated carbon fiber into the ethyl acetate solution, so that the pretreated carbon fiber absorbs ethyl acetate, and finally use the hydrolysis reaction of ethyl acetate and calcium hydroxide to generate calcium acetate to improve the carbon fiber surface At the same time, it can improve the hydrophilicity of carbon fiber to a certain extent; then prepare a certain concentration of polyvinyl alcohol aqueous solution, add surface-modified nano-inorganic antibacterial particles to it, stir and disperse, and obtain surface-modified nano-inorganic antibacterial Particle dispersion, and then add polyurethane emulsion to it, under the condition of stirring and ultrasonic, the polyurethane particles in the polyurethane emulsion are wrapped on the surface of the surface modified nano-inorganic antibacterial particles, so as to obtain the surface treatment liquid, and finally processed by dipping and drying , using polyurethane as an adhesive to evenly attach surface-modified nano-inorganic antibacterial particles to the surface of carbon fibers, so that carbon fibers have good antibacterial and antibacterial effects. At the same time, polyurethane attached to the surface of carbon fibers produces a good coating effect on the surface of carbon fibers , improve the clustering of carbon fibers, thereby improving the wear resistance of carbon fibers.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1

A flame-retardant and wear-resistant antibacterial yarn, comprising the following raw materials in parts by weight: 1.6 parts of modified carbon fiber, 7.5 parts of skin-friendly fiber;

The skin-friendly fiber is cotton fiber;

The preparation method of the above-mentioned flame-retardant and wear-resistant antibacterial yarn is:

Step 1, preparing modified carbon fibers;

Step 2, weighing the skin-friendly fiber;

Step 3, after uniformly mixing the modified carbon fiber and the skin-friendly fiber according to the weight ratio, spinning to obtain the basic yarn;

Step 4, at first preparation mass concentration is the polyvinyl alcohol aqueous solution of 4%, then the preparation mass concentration is the chitosan aqueous solution of 5.5%, the degree of deacetylation of chitosan is greater than or equal to 90%, the polyvinyl alcohol aqueous solution and chitosan The aqueous solution was stirred and dispersed at a speed of 420r/min for 50min according to the weight ratio of 1:0.6. After vacuum defoaming, a mixed solution was obtained; after the mixed solution was heated to 80°C, montmorillonite was added to it, and then the Mixing and stirring for 2h under the condition of the coating solution, wherein the weight ratio of montmorillonite to the mixed solution is 1:4;

Step 5: After soaking the base yarn in the coating solution for 15s, filter and add the yarn into the solidification solution, soak at 40°C for 25min, rinse with deionized water, and dry at 60°C Dry to obtain flame-retardant and wear-resistant antibacterial yarns.

The solidified solution is prepared by uniformly mixing water, formaldehyde, concentrated sulfuric acid with a mass fraction of 98.3% and sodium sulfate according to a weight ratio of 1:0.2:0.04:0.03;

The preparation method of described modified carbon fiber is:

S1. Surface-treat the nano-inorganic antibacterial particles with a silane coupling agent, and obtain surface-modified nano-inorganic antibacterial particles for use after drying;

The nano inorganic antibacterial particle is nano zinc oxide;

The silane coupling agent is KH550;

S2. Add carbon fiber to a mixture of ethanol and water in any ratio, and treat it at a temperature of 55°C and a frequency of 100KHz for 25min, then dry it in a vacuum drying oven at a temperature of 100°C for 2.5h, and then dry it at 680°C under nitrogen. Roasting in the atmosphere for 2 hours to obtain pretreated carbon fibers;

S3. Add the pretreated carbon fiber prepared in step S2 into a saturated calcium hydroxide solution and soak for 30 hours. After filtering, dry it in a vacuum drying oven at a temperature of 110° C., and then raise the temperature to 350° C. for 1.5 hours of activation treatment. Cool to room temperature;

S4. Add the pretreated carbon fibers obtained in step S3 into the ethyl acetate solution, disperse and soak at 30°C for 42 hours, filter and separate, hydrolyze for 18 hours under vacuum at 85°C, and cool to room temperature Purging with nitrogen for 2.4 hours, and then vacuum-drying at a temperature of 115°C for 16 hours to obtain surface-modified carbon fibers;

S5, prepare the polyvinyl alcohol aqueous solution that mass concentration is 1.8%, then add the surface-modified nano-inorganic antibacterial particle prepared in step S1, ultrasonic treatment 12min under the condition of 100KHz, obtain surface-modified nano-inorganic antibacterial particle dispersion liquid , and then prepare the polyurethane emulsion that the solid content is 28%, under the condition of 480r/min, the dispersion of surface modified nano inorganic antibacterial particles is stirred, and in the stirring process, slowly add polyurethane emulsion, polyurethane The volume ratio of the emulsion to the surface-modified nano-inorganic antibacterial particle dispersion is 1:0.7. After the polyurethane emulsion is completely added, it is ultrasonically treated at 120KHz for 20min, and then stirred at a rotating speed of 1400r/min for 40min to obtain surface treatment fluid;

The mass concentration of surface-modified nano-inorganic antibacterial particles in the surface treatment solution is 4.2g/L;

S6. Add the carbon fiber prepared in step S4 into the surface treatment solution, and after immersion treatment at a temperature of 50° C. for 15 hours, take out the carbon fiber and dry it at a temperature of 70° C. to obtain a modified carbon fiber.

Example 2

A flame-retardant and wear-resistant antibacterial yarn, comprising the following raw materials in parts by weight: 1.2 parts of modified carbon fiber, 8 parts of skin-friendly fiber;

The skin-friendly fiber is cotton fiber;

The preparation method of the above-mentioned flame-retardant and wear-resistant antibacterial yarn is:

Step 1, preparing modified carbon fibers;

Step 2, weighing the skin-friendly fiber;

Step 3, after uniformly mixing the modified carbon fiber and the skin-friendly fiber according to the weight ratio, spinning to obtain the basic yarn;

Step 4, at first preparation mass concentration is the polyvinyl alcohol aqueous solution of 3.4%, then preparation mass concentration is the chitosan aqueous solution of 6.2%, the degree of deacetylation of chitosan is greater than or equal to 90%, the polyvinyl alcohol aqueous solution and chitosan The aqueous solution was stirred and dispersed at a speed of 420r/min for 50min according to the weight ratio of 1:0.7. After vacuum defoaming, a mixed solution was obtained; after the mixed solution was heated to 80°C, montmorillonite was added to it, and then the Mixing and stirring for 2h under the condition of the coating solution, wherein the weight ratio of montmorillonite to the mixed solution is 1:4;

Step 5: After soaking the base yarn in the coating solution for 25 seconds, filter and add the yarn into the solidification solution, soak at 35°C for 24 minutes, rinse with deionized water, and dry at 55°C Dry to obtain flame-retardant and wear-resistant antibacterial yarns.

The solidified liquid is made by uniformly mixing water, formaldehyde, concentrated sulfuric acid and sodium sulfate with a mass fraction of 98.3% according to a weight ratio of 1:0.2:0.06:0.03;

The preparation method of described modified carbon fiber is:

S1. Surface-treat the nano-inorganic antibacterial particles with a silane coupling agent, and obtain surface-modified nano-inorganic antibacterial particles for use after drying;

The nano inorganic antibacterial particle is nano zinc oxide;

The silane coupling agent is KH550;

S2. Add carbon fiber to a mixture of ethanol and water in any ratio, and treat it at a temperature of 55°C and a frequency of 100KHz for 25min, then dry it in a vacuum drying oven at a temperature of 100°C for 3h, and then dry it at 700°C in a nitrogen atmosphere. Medium roasting for 2 hours to obtain pretreated carbon fibers;

S3. Add the pretreated carbon fiber prepared in step S2 into a saturated calcium hydroxide solution for soaking for 30 hours, filter and dry in a vacuum drying oven at a temperature of 112°C, then raise the temperature to 380°C for activation for 1 hour, and cool naturally to room temperature;

S4. Add the pretreated carbon fiber obtained in step S3 into the ethyl acetate solution, disperse and soak at 35°C for 40h, filter and separate, hydrolyze for 18h under vacuum at 80°C, and cool to room temperature Purging with nitrogen for 2.5 hours, and then vacuum-drying at 120°C for 16 hours to obtain surface-modified carbon fibers;

S5, prepare the polyvinyl alcohol aqueous solution that mass concentration is 1.8%, then add the surface-modified nano-inorganic antibacterial particle prepared in step S1, ultrasonic treatment 12min under the condition of 100KHz, obtain surface-modified nano-inorganic antibacterial particle dispersion liquid , and then prepare the polyurethane emulsion that the solid content is 40%, under the condition of 520r/min, the dispersion of surface modified nano inorganic antibacterial particles is stirred, and slowly add polyurethane emulsion, polyurethane The volume ratio of the emulsion to the surface-modified nano-inorganic antibacterial particle dispersion is 1:1.3. After the polyurethane emulsion is completely added, it is ultrasonically treated at 120KHz for 20min, and then stirred for 40min at a rotating speed of 1200r/min to obtain surface treatment fluid;

The mass concentration of surface-modified nano inorganic antibacterial particles in the surface treatment solution is 3.6g/L;

S6. Add the carbon fiber prepared in step S4 into the surface treatment liquid, and after immersion treatment at a temperature of 50° C. for 20 hours, take out the carbon fiber and dry it at a temperature of 70° C. to obtain a modified carbon fiber.

Comparative example 1

The preparation method of described modified carbon fiber is:

S1. Surface-treat the nano-inorganic antibacterial particles with a silane coupling agent, and obtain surface-modified nano-inorganic antibacterial particles for use after drying;

The nano inorganic antibacterial particle is nano zinc oxide;

The silane coupling agent is KH550;

S2. Add carbon fiber to a mixture of ethanol and water in any ratio, and treat it at a temperature of 55°C and a frequency of 100KHz for 25min, then dry it in a vacuum drying oven at a temperature of 100°C for 2.5h, and then dry it at 680°C under nitrogen. Roasting in the atmosphere for 2 hours to obtain pretreated carbon fibers;

S3, prepare the polyvinyl alcohol aqueous solution that mass concentration is 1.8%, then add the surface-modified nano-inorganic antibacterial particle prepared in step S1, ultrasonic treatment 12min under the condition of 100KHz, obtain surface-modified nano-inorganic antibacterial particle dispersion liquid , and then prepare the polyurethane emulsion that the solid content is 28%, under the condition of 480r/min, the dispersion of surface modified nano inorganic antibacterial particles is stirred, and in the stirring process, slowly add polyurethane emulsion, polyurethane The volume ratio of the emulsion to the surface-modified nano-inorganic antibacterial particle dispersion is 1:0.7. After the polyurethane emulsion is completely added, it is subjected to ultrasonic treatment for 20 minutes under the condition of 120KHz, and then stirred for 40 minutes under the condition of the rotating speed of 1400r/min to obtain surface treatment fluid;

The mass concentration of surface-modified nano-inorganic antibacterial particles in the surface treatment solution is 4.2g/L;

S4. Add the carbon fiber prepared in step S2 into the surface treatment liquid, and after immersion treatment at a temperature of 50° C. for 15 hours, take out the carbon fiber and dry it at a temperature of 70° C. to obtain a modified carbon fiber.

Comparative example 2

The preparation method of described modified carbon fiber is:

S1. Surface-treat the nano-inorganic antibacterial particles with a silane coupling agent, and obtain surface-modified nano-inorganic antibacterial particles for use after drying;

The nano inorganic antibacterial particle is nano zinc oxide;

The silane coupling agent is KH550;

S2. Add carbon fiber to a mixture of ethanol and water in any ratio, and treat it at a temperature of 55°C and a frequency of 100KHz for 25min, then dry it in a vacuum drying oven at a temperature of 100°C for 2.5h, and then dry it at 680°C under nitrogen. Roasting in the atmosphere for 2 hours to obtain pretreated carbon fibers;

S3. Add the pretreated carbon fiber prepared in step S2 into a saturated calcium hydroxide solution and soak for 30 hours. After filtering, dry it in a vacuum drying oven at a temperature of 110° C., and then raise the temperature to 350° C. for 1.5 hours of activation treatment. Cool to room temperature;

S4. Add the pretreated carbon fibers obtained in step S3 into the ethyl acetate solution, disperse and soak at 30°C for 42 hours, filter and separate, hydrolyze for 18 hours under vacuum at 85°C, and cool to room temperature The modified carbon fibers were obtained by purging with nitrogen for 2.4 hours, and then vacuum-drying at a temperature of 115° C. for 16 hours.

Experimental data and result analysis

The antibacterial properties (GB/T20944.3-2008), limiting oxygen index, breaking strength and hand of the yarn in Example 1-2 and Comparative Example 1-2 are tested, and the specific results are shown in Table 1;

Table 1

the	Escherichia coli inhibition rate/%	limiting oxygen index	Breaking strength/cN	feel
Example 1	>99.9%	31.9	201.7	soft
Example 2	>99.9%	32.3	198.6	soft
Comparative example 1	>99.9%	28.6	183.2	soft
Comparative example 2	>78.9%	27.6	174.3	soft

From the above results, it can be seen that the flame-retardant and wear-resistant antibacterial yarn of the present invention has good flame-retardant, wear-resistant and antibacterial and antibacterial effects.

The above content is only an example and description of the structure of the present invention. Those skilled in the art make various modifications or supplements to the described specific embodiments or replace them in similar ways, as long as they do not deviate from the structure of the invention or Anything beyond the scope defined in the claims shall belong to the protection scope of the present invention.

Claims (5)

1. A flame-retardant and wear-resistant antibacterial yarn, characterized in that it comprises the following raw materials in parts by weight: 0.8-2 parts of modified carbon fiber, 7-9 parts of skin-friendly fiber;

   The skin-friendly fiber comprises one or a mixture of two random ratios of cotton fiber and hemp fiber;

   The preparation method of the flame-retardant and wear-resistant antibacterial yarn is as follows:

   Step 1, preparing modified carbon fibers;

   The preparation method of described modified carbon fiber is:

   S1. Surface-treat the nano-inorganic antibacterial particles with a silane coupling agent, and obtain surface-modified nano-inorganic antibacterial particles for use after drying;

   S2. Add carbon fiber to the mixture of ethanol and water in any ratio, and treat it for 20-30min at a temperature of 40-60°C and a frequency of 60-160KHz, and then dry it in a vacuum drying oven at a temperature of 90-120°C 2 After -3h, roast at 650-720°C for 1-3h in a nitrogen atmosphere to obtain pretreated carbon fibers;

   S3. Add the pretreated carbon fiber prepared in step S2 into a saturated calcium hydroxide solution for soaking for 24-36 hours, filter and dry in a vacuum drying oven at a temperature of 105-125°C, and then raise the temperature to 300-450°C Activation treatment for 1-1.5h, naturally cooled to room temperature;

   S4. Add the pretreated carbon fibers obtained in step S3 into the ethyl acetate solution, disperse and soak at 25-35°C for 30-48h, filter and separate, and hydrolyze under vacuum at 70-90°C 12-24h, after cooling to room temperature, purging with nitrogen for 1.5-4h, and then vacuum drying at a temperature of 105-125°C for 8-24h to obtain surface-modified carbon fibers;

   S5, the preparation mass concentration is the polyvinyl alcohol aqueous solution of 1.3%-2%, then adds the surface-modified nano-inorganic antibacterial particles prepared in step S1, ultrasonic treatment 10-14min under the condition of 80-130KHz, obtains surface modification Nano-inorganic antibacterial particle dispersion, and then prepare polyurethane emulsion, stir the surface-modified nano-inorganic antibacterial particle dispersion under the condition of rotating speed of 400-600r/min, and slowly add polyurethane to it during the stirring process For the emulsion, after the polyurethane emulsion is completely added, ultrasonically treat it for 20-25min under the condition of 80-160KHz, and then stir it for 30-50min under the condition of the rotational speed of 800-2600r/min to obtain the surface treatment liquid;

   S6. Add the carbon fiber prepared in step S4 into the surface treatment solution, dip it for 15-20 hours at a temperature of 40-55° C., take out the carbon fiber, and dry it until dry at a temperature of 65-70° C. , to obtain modified carbon fiber;

   Step 2, weighing the skin-friendly fiber;

   Step 3, after uniformly mixing the modified carbon fiber and the skin-friendly fiber according to the weight ratio, spinning to obtain the basic yarn;

   Step 4, first preparing an aqueous solution of polyvinyl alcohol with a mass concentration of 3%-5%, and then preparing an aqueous solution of chitosan with a mass concentration of 5%-7%, the degree of deacetylation of chitosan is greater than or equal to 90%, and the polyethylene Alcohol aqueous solution and chitosan aqueous solution according to the weight ratio of 1:0.6-1.2, stirring and dispersing at a speed of 240-600r/min for 40-60min, and vacuum defoaming to obtain a mixed solution; after heating the mixed solution to 75-85°C , adding montmorillonite thereto, and then mixing and stirring for 1.5-2.5h under the condition of a rotating speed of 400-600r/min to obtain a coating solution, wherein the weight ratio of montmorillonite to the mixed solution is 1:3-5;

   Step 5: After soaking the base yarn in the coating solution for 15-30s, filter and add the yarn into the solidification solution, soak for 20-30min at a temperature of 25-40°C, rinse with deionized water, and Dry at a temperature of 45-70°C to obtain a flame-retardant and wear-resistant antibacterial yarn.
2. A kind of flame-retardant and wear-resistant antibacterial yarn according to claim 1, it is characterized in that, solidified liquid described in step 5 is water, formaldehyde, the concentrated sulfuric acid that mass fraction is 98.3% and sodium sulfate according to weight ratio 1: 0.1-0.3:0.03-0.1:0.02-0.04 made by uniform mixing.
3. A flame-retardant and wear-resistant antibacterial yarn according to claim 1, wherein the nano-inorganic antibacterial particles in step S1 include one or at least two of nano-zinc oxide, nano-silver oxide and nano-titanium dioxide any ratio mixture.
4. A flame-retardant and wear-resistant antibacterial yarn according to claim 1, wherein the silane coupling agent in step S1 is one or at least two of KH550, KH560, KH570, KH792, DL602 and DL171 Any mixture of species.
5. A flame-retardant and wear-resistant antibacterial yarn according to claim 1, characterized in that the mass concentration of surface-modified nano inorganic antibacterial particles in the surface treatment solution in step S5 is 1.2-6.7g/L.