CN107881625A - Sun-proof antibacterial weaving face fabric - Google Patents

Abstract

The invention discloses a kind of sun-proof antibacterial weaving face fabric, it is mutually perpendicular to be interwoven by warp thread and weft yarn；Wherein, the component of the warp thread and each component mass parts are as follows：Wash nitrile composite fibre：42 45 parts, α-methylstyrene：37 parts, crosslinking agent：0.8 1.6 parts, chitosan：13 parts；The component and each component mass parts of the weft yarn are as follows：Acid fiber by polylactic：60 70 parts, string：16 18 parts, titanium dioxide：2 4.8 parts, vermiculite power：13 parts, polyvinyl alcohol：10 30 parts.The present invention is by being reasonably formulated composition, β-cyclodextrin is crosslinked between raw material, efficiency persistence is strong, and obtained warp thread, weft yarn have a good antibacterial ultraviolet-resistent property, and weatherability is strong, the ventilative oxygen flow good hygroscopicity of weaving face fabric, and Biodegradable fibers are employed, and coordinate string green, it is with all worries set aside to repose, comfort level is high, especially suitable for summer hot strong DT wearing.

Description

Sunscreen antibacterial textile fabric

technical field

The invention relates to a sunscreen and antibacterial textile fabric, belonging to the technical field of textile fabrics.

Background technique

At present, textile fabric is a common light industrial product in daily life. In the past, due to the low standard of living, textile fabrics only needed to meet the characteristics of durability and good touch. Now, with the improvement of living standards, people's functions of textile fabrics tend to Diversification, the functional requirements for textile fabrics are also getting higher and higher. Similar to the antibacterial function, which is beneficial to physical and mental health, has become the demand of consumers. In addition, with the improvement of consumers' safety awareness, the resistance to textile fabrics Combustibility, UV protection, breathability and health care are all conducive to higher requirements.

Polyester is an important variety of synthetic fibers and is the trade name of polyester fibers in my country. It is a fiber-forming high polymer prepared from purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification or transesterification and polycondensation reactions—— Polyethylene terephthalate (PET), a fiber made by spinning and post-processing. It has the advantages of high strength, high elasticity, and high wear resistance, but it has poor air permeability and moisture absorption. It is easy to cover it in clothes after sweating in hot summer, which is not only uncomfortable, but also easy to breed bacteria and endanger human health. Acrylic fiber refers to synthetic fibers made of polyacrylonitrile or acrylonitrile copolymers with acrylonitrile content greater than 85% (mass percentage), which has the advantages of softness, bulkiness, easy dyeing, bright color, light resistance, antibacterial, and no fear of insects. It also has poor hygroscopicity and poor wearing comfort, which is not conducive to the textile application of summer clothes.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a sunscreen and antibacterial textile fabric, which is composed of a reasonable formula, modified by cross-linking and bonding between raw materials, and has strong performance and durability. It has good antibacterial and anti-ultraviolet properties, strong weather resistance, and the textile fabric has good air permeability, oxygen permeability and moisture absorption, and uses biodegradable fibers, which are green and environmentally friendly with plant fibers. wear.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a kind of sunscreen and antibacterial textile fabric, which is formed by interweaving warp yarns and weft yarns vertically; wherein,

The components of the warp yarn and the parts by mass of each component are as follows: polyester nitrile composite fiber: 42-45 parts, α-methylstyrene: 3-7 parts, crosslinking agent: 0.8-1.6 parts, chitosan: 1 -3 copies;

The components of the weft yarn and the parts by mass of each component are as follows: polylactic acid fiber: 60-70 parts, plant fiber: 16-18 parts, titanium dioxide: 2-4.8 parts, vermiculite powder: 1-3 parts, polyvinyl alcohol : 10-30 servings.

Further, the polyester-acrylonitrile composite fiber is composed of polyester fiber and polyacrylonitrile fiber, and the mass ratio of polyester fiber and polyacrylonitrile fiber is 0.8:1.

Further, the crosslinking agent is a composition of polyethyleneimine and glyoxal with a mass ratio of 1:(2-5).

Further, the yarn count of the sunscreen and antibacterial textile fabric is 50/2×50, and the warp and weft density of the sunscreen and antibacterial textile fabric is 120×90.

Further, the plant fiber in the weft yarn is selected from at least one of aloe, bamboo, grass coral, mint and tea.

Further, the plant fiber in the weft yarn is a combination of aloe fiber, bamboo fiber and tea fiber with a mass ratio of 1:1:(0.5-1).

Further, the preparation method of described warp yarn is:

Weigh the raw materials according to each component and the mass parts of each component;

Blend chitosan and cross-linking agent and add appropriate amount of water to it, ultrasonically vibrate for 5-10 minutes, then add α-methylstyrene and granular polyester-acrylic composite fiber into it, stir evenly and send it to spinning In the machine, the raw warp yarn is obtained.

Further, the preparation process of the polyester-acrylonitrile composite fiber is as follows: soak the polyester fiber and polyacrylonitrile fiber in 30% ethanol solution for 5-6 hours, take it out and dry it at a constant temperature of 75-90°C, and break it into granules for later use. ; Wherein, the mass ratio of the polyester fiber and the polyacrylonitrile fiber is 0.8:1.

Further, the preparation method of the weft yarn is as follows: weighing the raw materials according to each component and the mass parts of each component, blending titanium dioxide and vermiculite powder, and adding 2-4 times the total mass of the two in 70% ethanol solution , sent into the ball mill for ball milling for 10-12 hours, taken out and dried, and calcined at 800-820°C for 2-5 hours, after the calcining was completed, the ball milled for the second time until the particle size reached nanometer level, and it was used for later use; the polylactic acid fiber and plant fiber , polyvinyl alcohol, and then add an appropriate amount of water to it, keep it warm at 40-50°C for 1-2h, then add nano-scale titanium dioxide and vermiculite powder under stirring conditions, first shake at 60°C for 30min, and then Ultrasonic treatment at 28-30KHz for 15 minutes, and finally into the spinning machine to obtain weft yarn raw silk.

After adopting the above-mentioned technical scheme, the sunscreen and antibacterial textile fabric of the present invention is composed of a reasonable formula, and the raw materials are modified by chemical cross-linking bonding, and the performance is durable. The UV coating is extended by more than 4 times. The prepared warp and weft yarns have good antibacterial and anti-ultraviolet properties, strong weather resistance, and the textile fabric has good air permeability, oxygen permeability and moisture absorption, and uses biodegradable fibers, which are green and environmentally friendly with plant fibers.

The polyester-acrylic composite fiber combines the excellent properties of both, and is chemically bonded with the surface active hydroxyl and amino groups of chitosan, and is grafted and modified, which significantly improves the antibacterial effect of the fiber, has strong hygroscopicity, and chitosan can maintain skin moisture. The metal-containing cosmetics coated on the skin surface have good cleaning effect and good economic value. In addition, chitosan can be used as a transition material to further connect the active groups in the weft fiber, which improves the strength and toughness of the textile fabric and has good comprehensive wear resistance.

The weft yarn is mainly made of polylactic acid fiber, which has excellent antibacterial and flame retardant properties, and has good air permeability, oxygen permeability and carbon dioxide permeability. With the cross-linking of plant fibers, on the one hand, it can be protected by planting wood sterilization, and on the other hand, it can improve the fragrance of textile fabrics It has a calming effect and good comprehensive degradability, which is in line with the safety and environmental protection advocated by modern times. In addition, polylactic acid fiber has excellent biocompatibility, and can speed up the chemical reaction efficiency while blending, strengthen the connection and bonding with titanium dioxide and vermiculite powder, and make the nano powder adhere to the fiber. Blending, grinding and calcining titanium dioxide and vermiculite powder, on the one hand, the excellent properties of the two can be combined, on the other hand, the volume expansion of vermiculite during the calcining process can make it have good carrier properties, and the comprehensive dispersion effect is good. After calcining, it can be obtained The structure of the nano-powder is uniform and stable, and the surface groups are more active, which effectively guarantees the anti-ultraviolet, antibacterial, wear-resistant and solvent-resistant properties of textile fabrics.

The UPF of the textile fabric prepared by the invention is greater than 36, the UVA transmittance is less than 2.8%, and the antibacterial rate is greater than 97.8% (99.4% for Staphylococcus aureus, 99% for Escherichia coli, and 98.6% for Candida albicans).

Detailed ways

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments.

Embodiment one

A sunscreen and antibacterial textile fabric, the sunscreen and antibacterial textile fabric is formed by interweaving warp and weft yarns vertically, the yarn count is 50/2×50, the warp and weft density is 120×90, and the warp yarn is made of polyester nitrile composite fiber, α-methyl Styrene, cross-linking agent, chitosan; weft yarn is composed of polylactic acid fiber, plant fiber, titanium dioxide, vermiculite powder, polyvinyl alcohol.

The mass parts of each raw material in the warp are 42 parts of polyester-acrylic composite fiber, 4 parts of α-methylstyrene, 0.8 parts of crosslinking agent, and 1.5 parts of chitosan, wherein the polyester-acrylic composite fiber is made of polystyrene with a mass ratio of 0.8:1. Composed of polyester fiber and polyacrylonitrile fiber. The preparation method of the warp yarn is as follows: Weigh the raw materials according to the mass parts, first put the polyester fiber and polyacrylonitrile fiber in 30% ethanol solution and soak for 5.5 hours, take them out, dry them at a constant temperature of 75°C, and break them into granular shapes for later use; Polysaccharide and crosslinking agent are blended and an appropriate amount of water is added to it, ultrasonically oscillated for 5-10 minutes, then α-methylstyrene, granular polyester fiber and polyacrylonitrile fiber are added to it, stirred evenly and then sent into In the spinning machine, warp raw silk is obtained.

The mass parts of each raw material in the weft yarn are 60 parts of polylactic acid fiber, 16 parts of plant fiber, 2.5 parts of titanium dioxide, 1 part of vermiculite powder, and 10 parts of polyvinyl alcohol. The plant fiber is selected from aloe, bamboo, grass coral, mint, and tea. At least one, preferably a composition in which the plant fiber is aloe fiber, bamboo fiber, and tea fiber at a mass ratio of 1:1:0.5. The preparation method of the weft yarn is as follows: Weigh the raw materials according to parts by mass, blend titanium dioxide and vermiculite powder, add 70% ethanol solution twice the total mass of the two to it, send it to the ball mill for 10 hours, take it out and dry it. Calcined at 810°C for 2.5 hours, after the calcination was completed, ball milled for the second time until the particle size reached the nanometer level, and set aside; blended polylactic acid fiber, plant fiber, and polyvinyl alcohol, and then added an appropriate amount of water to it, and kept at 40°C for 1.5 h, then add nano-scale titanium dioxide and vermiculite powder into it under stirring conditions, firstly shake at 60°C for 30 minutes, then ultrasonically treat at 28KHz for 15 minutes, and finally send it into the spinning machine to obtain the weft yarn raw silk.

Embodiment two

A sunscreen and antibacterial textile fabric, the sunscreen and antibacterial textile fabric is formed by interweaving warp and weft yarns vertically, the yarn count is 50/2×50, the warp and weft density is 120×90, and the warp yarn is made of polyester nitrile composite fiber, α-methyl Styrene, cross-linking agent, chitosan; weft yarn is composed of polylactic acid fiber, plant fiber, titanium dioxide, vermiculite powder, polyvinyl alcohol.

The mass parts of each raw material in the warp are 44 parts of polyester-acrylic composite fiber, 5 parts of α-methylstyrene, 1.2 parts of crosslinking agent, and 2.5 parts of chitosan. Composed of polyester fiber and polyacrylonitrile fiber. The preparation method of the warp yarn is as follows: Weigh the raw materials according to the mass parts, first put the polyester fiber and polyacrylonitrile fiber in 30% ethanol solution and soak for 5.4 hours, after taking it out, dry it at a constant temperature of 85°C, and break it into granules for later use; Polysaccharide and crosslinking agent are blended and an appropriate amount of water is added to it, ultrasonically oscillated for 5-10 minutes, then α-methylstyrene, granular polyester fiber and polyacrylonitrile fiber are added to it, stirred evenly and then sent into In the spinning machine, warp raw silk is obtained.

The mass parts of each raw material in the weft yarn are 65 parts of polylactic acid fiber, 17 parts of plant fiber, 4 parts of titanium dioxide, 1.5 parts of vermiculite powder, and 15 parts of polyvinyl alcohol. The plant fiber is selected from aloe, bamboo, grass coral, mint, and tea. At least one, preferably a composition in which the plant fiber is aloe fiber, bamboo fiber, and tea fiber at a mass ratio of 1:1:1. The preparation method of the weft yarn is as follows: Weigh the raw materials in parts by mass, blend titanium dioxide and vermiculite powder, add 70% ethanol solution twice the total mass of the two to it, send it into a ball mill for ball milling for 10.5 hours, take it out and dry it. And calcined at 800°C for 3.5h. After the calcining was completed, the ball milled for the second time until the particle size reached the nanometer level, and it was ready for use; blended polylactic acid fiber, plant fiber, and polyvinyl alcohol, and then added an appropriate amount of water to it, and kept it at 45°C. 1.2h, then add nano-scale titanium dioxide and vermiculite powder into it under stirring condition, first shake at a constant temperature of 60°C for 30min, then ultrasonically treat at 28.5KHz for 15min, and finally send it into the spinning machine to obtain the raw yarn of weft yarn.

Embodiment three

A sunscreen and antibacterial textile fabric, the sunscreen and antibacterial textile fabric is formed by interweaving warp yarn and weft yarn vertically, the yarn count is 50/2×50, the warp and weft density is 120×90, and the warp yarn is made of polyester nitrile composite fiber, α-methyl Styrene, cross-linking agent, chitosan; weft yarn is composed of polylactic acid fiber, plant fiber, titanium dioxide, vermiculite powder, polyvinyl alcohol.

The mass parts of each raw material in the warp yarn are 45 parts of polyester-acrylic composite fiber, 6 parts of α-methylstyrene, 1.5 parts of crosslinking agent, and 3 parts of chitosan, wherein the polyester-acrylic composite fiber is composed of polyacrylamide with a mass ratio of 0.8:1. Composed of polyester fiber and polyacrylonitrile fiber. The preparation method of the warp yarn is as follows: Weigh the raw materials according to the mass parts, first put the polyester fiber and polyacrylonitrile fiber in 30% ethanol solution and soak for 5.8 hours, take them out and dry them at a constant temperature of 90°C, and break them into granular shapes for later use; Polysaccharide and crosslinking agent are blended and an appropriate amount of water is added to it, ultrasonically oscillated for 5-10 minutes, then α-methylstyrene, granular polyester fiber and polyacrylonitrile fiber are added to it, stirred evenly and then sent into In the spinning machine, warp raw silk is obtained.

The mass parts of each raw material in the weft yarn are 70 parts of polylactic acid fiber, 17.5 parts of plant fiber, 2 parts of titanium dioxide, 2 parts of vermiculite powder, and 20 parts of polyvinyl alcohol. The plant fiber is selected from aloe, bamboo, grass coral, mint, and tea. At least one, preferably a composition in which the plant fiber is aloe fiber, bamboo fiber, and tea fiber at a mass ratio of 1:1:0.6. The preparation method of the weft yarn is as follows: Weigh the raw materials in parts by mass, blend titanium dioxide and vermiculite powder, add 70% ethanol solution 3 times the total mass of the two to it, send it to the ball mill for 11 hours, take it out and dry it. Calcined at 805°C for 4 hours, after the calcination was completed, ball milled for the second time until the particle size reached the nanometer level, and set aside; blended polylactic acid fiber, plant fiber, and polyvinyl alcohol, and then added an appropriate amount of water to it, and kept it at 50°C for 1 hour. Then add nano-scale titanium dioxide and vermiculite powder into it under stirring condition, shake at a constant temperature of 60°C for 30 minutes, then ultrasonically treat at 29KHz for 15 minutes, and finally send it into the spinning machine to obtain the raw yarn of weft yarn.

Embodiment four:

A sunscreen and antibacterial textile fabric, the sunscreen and antibacterial textile fabric is formed by interweaving warp and weft yarns vertically, the yarn count is 50/2×50, the warp and weft density is 120×90, and the warp yarn is made of polyester nitrile composite fiber, α-methyl Styrene, cross-linking agent, chitosan; weft yarn is composed of polylactic acid fiber, plant fiber, titanium dioxide, vermiculite powder, polyvinyl alcohol.

The mass parts of each raw material in the warp yarn are 43 parts of polyester-acrylic composite fiber, 3 parts of α-methylstyrene, 1 part of crosslinking agent, and 1 part of chitosan. Composed of polyester fiber and polyacrylonitrile fiber. The preparation method of the warp yarn is as follows: Weigh the raw materials according to the mass parts, first put the polyester fiber and polyacrylonitrile fiber in 30% ethanol solution and soak for 5 hours, take them out and dry them at a constant temperature of 85°C, and break them into granular shapes for later use; Blend sugar and cross-linking agent and add appropriate amount of water to it, ultrasonically vibrate for 5-10 minutes, then add α-methylstyrene, granular polyester fiber and polyacrylonitrile fiber to it, stir evenly and send it to the spinning machine In the silk machine, warp raw silk is obtained.

The mass parts of each raw material in the weft yarn are 68 parts of polylactic acid fiber, 18 parts of plant fiber, 3.5 parts of titanium dioxide, 2.2 parts of vermiculite powder, and 25 parts of polyvinyl alcohol. The plant fiber is selected from aloe, bamboo, grass coral, mint, and tea. At least one, preferably a composition in which the plant fiber is aloe fiber, bamboo fiber, and tea fiber at a mass ratio of 1:1:0.8. The preparation method of the weft yarn is as follows: Weigh the raw materials in parts by mass, blend titanium dioxide and vermiculite powder, add 70% ethanol solution which is 3 times the total mass of the two, send it into the ball mill for 10 hours, take it out, dry it, and Calcined at 820°C for 5 hours, after the calcination was completed, ball milled for the second time until the particle size reached the nanometer level, and set aside; blended polylactic acid fiber, plant fiber, and polyvinyl alcohol, and then added an appropriate amount of water to it, and kept it at 50°C for 2 hours. Then add nano-scale titanium dioxide and vermiculite powder into it under stirring condition, shake at a constant temperature of 60°C for 30 minutes, then ultrasonically treat at 29KHz for 15 minutes, and finally send it into the spinning machine to obtain the raw yarn of weft yarn.

Embodiment five:

A sunscreen and antibacterial textile fabric, the sunscreen and antibacterial textile fabric is formed by interweaving warp and weft yarns vertically, the yarn count is 50/2×50, the warp and weft density is 120×90, and the warp yarn is made of polyester nitrile composite fiber, α-methyl Styrene, cross-linking agent, chitosan; weft yarn is composed of polylactic acid fiber, plant fiber, titanium dioxide, vermiculite powder, polyvinyl alcohol.

The mass parts of each raw material in the warp are 44 parts of polyester-acrylic composite fiber, 7 parts of α-methylstyrene, 1.6 parts of crosslinking agent, and 2.8 parts of chitosan. Composed of polyester fiber and polyacrylonitrile fiber. The preparation method of the warp yarn is as follows: Weigh the raw materials according to parts by mass, first put the polyester fiber and polyacrylonitrile fiber in 30% ethanol solution and soak them for 6 hours, take them out and dry them at a constant temperature of 80°C, and break them into granules for later use; Blend sugar and cross-linking agent and add appropriate amount of water to it, ultrasonically vibrate for 5-10 minutes, then add α-methylstyrene, granular polyester fiber and polyacrylonitrile fiber to it, stir evenly and send it to the spinning machine In the silk machine, warp raw silk is obtained.

The mass parts of each raw material in the weft yarn are 65 parts of polylactic acid fiber, 17 parts of plant fiber, 4.8 parts of titanium dioxide, 3 parts of vermiculite powder, and 30 parts of polyvinyl alcohol. The plant fiber is selected from aloe, bamboo, grass coral, mint, and tea. At least one, preferably a composition in which the plant fiber is aloe fiber, bamboo fiber, and tea fiber at a mass ratio of 1:1:1. The preparation method of the weft yarn is as follows: Weigh the raw materials according to parts by mass, blend titanium dioxide and vermiculite powder, add 70% ethanol solution 4 times the total mass of the two to it, send it into the ball mill for 12 hours, take it out, dry it, and Calcined at 815°C for 2 hours, after the calcination was completed, ball milled for the second time until the particle size reached the nanometer level, and set aside; blended polylactic acid fiber, plant fiber, and polyvinyl alcohol, and then added an appropriate amount of water to it, and kept it at 45°C for 1.5 hours , and then add nano-scale titanium dioxide and vermiculite powder into it under stirring conditions, first shake at a constant temperature of 60°C for 30 minutes, then ultrasonically treat at 30KHz for 15 minutes, and finally send it into the spinning machine to obtain the weft yarn raw silk.

The sunscreen and antibacterial textile fabric sunscreen UPF that above five embodiments make is greater than 36, and UVA transmittance is less than 2.8%, and antibacterial rate is greater than 97.8% (staphylococcus aureus 99.4%, escherichia coli 99%, candida albicans 98.6%) . All meet the design requirements.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. A sun-proof antibacterial textile fabric is characterized in that: it is formed by mutually and vertically interweaving warp yarns and weft yarns; wherein,

the warp comprises the following components, by mass, 42-45 parts of polyester-nitrile composite fiber, 3-7 parts of α -methyl styrene, 0.8-1.6 parts of a cross-linking agent and 1-3 parts of chitosan;

the weft comprises the following components in parts by mass: polylactic acid fiber: 60-70 parts of plant fiber: 16-18 parts of titanium dioxide: 2-4.8 parts of vermiculite powder: 1-3 parts of polyvinyl alcohol: 10-30 parts.

2. The sun-blocking antibacterial textile fabric according to claim 1, characterized in that: the polyester-acrylonitrile composite fiber consists of polyester fiber and polyacrylonitrile fiber, and the mass ratio of the polyester fiber to the polyacrylonitrile fiber is 0.8: 1.

3. the sun-blocking antibacterial textile fabric according to claim 1, characterized in that: the cross-linking agent is prepared from the following components in a mass ratio of 1: (2-5) the composition of polyethyleneimine with glyoxal.

4. The sun-blocking antibacterial textile fabric according to claim 1, characterized in that: the yarn count of the sun-proof antibacterial textile fabric is 50/2 multiplied by 50, and the warp and weft density of the sun-proof antibacterial textile fabric is 120 multiplied by 90.

5. The sun-blocking antibacterial textile fabric according to claim 1, characterized in that: the plant fiber in the weft yarn is at least one selected from aloe, bamboo, sarcandra glabra, mint and tea.

6. The sun-blocking antibacterial textile fabric according to claim 5, characterized in that: the vegetable fibers in the weft yarns are in a mass ratio of 1: 1: (0.5-1) Aloe fiber, bamboo fiber, and tea fiber.

7. The sun-blocking antibacterial textile fabric according to claim 1, characterized in that: the preparation method of the warp comprises the following steps:

weighing the raw materials according to the components and the mass parts of the components;

mixing chitosan and a cross-linking agent, adding a proper amount of water, ultrasonically oscillating for 5-10min, adding α -methyl styrene and granular polyester-nitrile composite fibers, uniformly stirring, and feeding into a spinning machine to obtain the warp yarn precursor.

8. The sun-blocking antibacterial textile fabric according to claim 7, characterized in that: the preparation process of the polyester-nitrile composite fiber is as follows: soaking polyester fiber and polyacrylonitrile fiber in 30% ethanol solution for 5-6 hr, taking out, oven drying at 75-90 deg.C, and crushing into granules; wherein the mass ratio of the polyester fiber to the polyacrylonitrile fiber is 0.8: 1.

9. the sun-blocking antibacterial textile fabric according to claim 1, characterized in that: the preparation method of the weft comprises the following steps: weighing the raw materials according to the components and the mass parts of the components, blending the titanium dioxide and the vermiculite powder, adding 70% ethanol solution which is 2-4 times of the total mass of the titanium dioxide and the vermiculite powder, sending the mixture into a ball mill for ball milling for 10-12h, taking out the mixture, drying the mixture, calcining the mixture for 2-5h at the temperature of 800-820 ℃, and performing secondary ball milling after the calcination until the particle size reaches the nanometer level for later use; mixing polylactic acid fiber, plant fiber and polyvinyl alcohol, adding a proper amount of water, keeping the temperature at 40-50 ℃ for 1-2h, adding nano titanium dioxide and vermiculite powder under the stirring condition, oscillating at the constant temperature of 60 ℃ for 30min, treating under 28-30KHz ultrasonic waves for 15min, and finally sending into a spinning machine to obtain the weft precursor.