阅读说明：本技术 一种保暖抑菌功能纤维的制备方法及其应用 (Preparation method and application of fiber with warm-keeping and bacteriostatic functions ) 是由 朱惠杰 于 2019-09-08 设计创作，主要内容包括：本发明涉及功能纺织纤维技术领域,涉及一种保暖抑菌功能纤维的制备方法及其应用,S1、先制备功能粉体；S2、制备功能聚酯切片：将功能粉体、对苯二甲酸以及乙二醇放入容器内,同时加入催化剂,防醚剂,抗氧化剂进行打浆制备得到打浆液,然后打浆液进行加压酯化反应制备酯化浆液,再将酯化浆液进行预缩聚反应和终缩聚反应,熔融切粒制备得到功能聚酯切片；S3、制备保暖抑菌功能纤维：将功能聚酯切片经高压熔融挤出,环吹风冷却,集束上油,牵伸热定型,卷绕制备得到保暖抑菌功能纤维。本发明提高了保暖抑菌功能纤维的制备效率及保暖抑菌性能,克服了现有技术中功能纤维的制备效率低下及性能不足的缺陷,达到高效制备保暖抑菌功能纤维的目的。(The invention relates to the technical field of functional textile fibers, in particular to a preparation method and application of a warm-keeping bacteriostatic functional fiber, S1, preparing functional powder; s2, preparing functional polyester chips: putting functional powder, terephthalic acid and ethylene glycol into a container, adding a catalyst, an ether inhibitor and an antioxidant into the container, pulping to prepare pulping liquid, then carrying out pressurized esterification reaction on the pulping liquid to prepare esterified pulp, carrying out pre-polycondensation reaction and final polycondensation reaction on the esterified pulp, and carrying out melt granulation to prepare functional polyester chips; s3, preparing the fiber with the functions of heat preservation and bacteriostasis: and (3) performing high-pressure melting extrusion on the functional polyester chips, cooling by circular air blowing, bundling and oiling, drafting and heat setting, and winding to prepare the thermal-insulation antibacterial functional fiber. The invention improves the preparation efficiency and the heat-insulating and bacteriostatic performance of the heat-insulating and bacteriostatic functional fiber, overcomes the defects of low preparation efficiency and insufficient performance of the functional fiber in the prior art, and achieves the aim of efficiently preparing the heat-insulating and bacteriostatic functional fiber.)

1. a preparation method of a warm-keeping bacteriostatic functional fiber is characterized by comprising the following steps:

s1, preparing functional powder;

S2, preparing functional polyester chips: putting functional powder, terephthalic acid and ethylene glycol into a container, adding a catalyst, an ether inhibitor and an antioxidant into the container, pulping to prepare pulping liquid, then carrying out pressurized esterification reaction on the pulping liquid to prepare esterified pulp, carrying out pre-polycondensation reaction and final polycondensation reaction on the esterified pulp, and carrying out melt granulation to prepare functional polyester chips;

S3, preparing the fiber with the functions of heat preservation and bacteriostasis: and (3) performing high-pressure melting extrusion on the functional polyester chips, cooling by circular air blowing, bundling and oiling, drafting and heat setting, and winding to prepare the thermal-insulation antibacterial functional fiber.

2. The method for preparing the warm-keeping bacteriostatic functional fiber according to claim 1, wherein the specific contents of the step S1 include:

S11, firstly, dissolving bismuth nitrate powder in an ethylene glycol solution to prepare a bismuth nitrate solution for later use;

S12, dispersing polyacrylic resin in an ethylene glycol solution, and stirring with ammonia water to dissolve the polyacrylic resin in the ethylene glycol solution to prepare a polyacrylic acid mixed solution;

S13, adding potassium iodide into the polyacrylic acid mixed solution, dissolving, and obtaining a functional powder precursor solution after the solution is clarified;

S14, dropwise adding the bismuth nitrate solution prepared in the step S1 into the functional powder precursor solution under ultrasonic and rapid stirring to perform ultrasonic stirring reaction for several hours;

S15, adding tungsten nitrate powder, carrying out dissolving and adsorption reaction, continuously carrying out ultrasonic stirring reaction for a plurality of hours, filtering, and washing with deionized water for a plurality of times to obtain filter residue;

S16, calcining the filter residue in an aerobic environment at 450-750 ℃ for several hours, and then calcining in an aerobic environment at 800-1000 ℃ to prepare the functional powder.

3. The method for preparing the warm-keeping bacteriostatic functional fiber according to claim 2, characterized in that in the step S11, the mass fraction of bismuth nitrate in the bismuth nitrate solution is 5-15%; in the step S12, the mass fraction of polyacrylic acid in the polyacrylic acid mixed solution is 5-15%; in the step S13, the mass fraction of potassium iodide in the functional powder precursor solution is 5 to 15%.

4. The method for preparing the warm-keeping bacteriostatic functional fiber according to claim 2, wherein in the step S14, the volume ratio of the functional powder precursor solution to the bismuth nitrate solution is 1: 0.25-1: 0.50.

5. The method for preparing the warm-keeping bacteriostatic functional fiber according to claim 2, wherein in the step S15, the addition amount of the tungsten nitrate powder is 5-10% of the mass fraction of the functional powder precursor solution.

6. the method for preparing the warm-keeping bacteriostatic functional fiber according to claim 1, wherein in the step S2, the molar ratio of the terephthalic acid to the ethylene glycol is 1: 1.05-1.25; the mass ratio of the functional powder to the glycol is 1: 50-200; the mass fraction of the catalyst relative to the terephthalic acid is 0.05 percent; the mass fraction of the ether inhibitor relative to the terephthalic acid is 0.05 percent; the antioxidant was 0.05% by mass relative to terephthalic acid.

7. The method for preparing the heat-insulating bacteriostatic functional fiber according to claim 1, wherein in the step S2, the catalyst is ethylene glycol antimony, the ether inhibitor is sodium acetate, and the antioxidant is triphenyl phosphate.

8. The method for preparing the heat-insulating bacteriostatic functional fiber according to claim 1, wherein in the step S2, in the pressure esterification process, the pressure is 0.35-0.45 MPa, the esterification temperature is 230-245 ℃, and the esterification time is 2.5-3.0 h; the pre-polycondensation reaction is normal-pressure polycondensation, the pre-polycondensation temperature is 250-260 ℃, and the pre-polycondensation time is 0.5-1.5 h.

9. the method for preparing the heat-insulating bacteriostatic functional fiber according to the claim 8, wherein in the step S2, the final polycondensation reaction is vacuum polycondensation, and the low vacuum polycondensation is performed firstly, and then the high vacuum polycondensation is performed; the vacuum degree of the low vacuum polycondensation is 500-5000 Pa, the low vacuum polycondensation time is 0.5-1.0 h, the vacuum degree of the high vacuum polycondensation is 50-100 Pa, and the high vacuum polycondensation time is 1.0-3.0 h.

10. The application of the warm-keeping bacteriostatic functional fiber prepared according to any one of claims 1 to 9 in cloth.

Technical Field

The invention relates to the technical field of functional textile fibers, in particular to a preparation method and application of a thermal-insulation bacteriostatic functional fiber.

background

At present, many women have the conditions of cold womb and cold stomach, which cause many female diseases; the heat preservation is an important means for relieving the menstrual pain of the female and protecting the body health of the female at present. The existing warm-keeping functional fiber is mainly prepared by adopting fiber special-shaped section design and adding warm-keeping functional powder such as far infrared and the like to realize the warm-keeping function of the fiber; the hollow fibers, especially the hollow filaments, can enrich the fibers with a large amount of still air, thereby increasing thermal resistance and reducing heat loss through heat conduction. The fabric is also a novel fiber with moisture absorption and sweat releasing functions, has a special-shaped section, and can absorb moisture of sweat and moisture on the surface of skin and rapidly conduct the moisture to the surface of clothing, so that the evaporation of the moisture is accelerated. And because of the unique hollow section structure, the utility model has the characteristics of light weight, softness, comfort and the like, thereby being widely applied to underwear, sports clothes, curtains and the like. With the continuous and deep research, single hollow is also developed into three-hole, four-hole or even six-hole terylene fiber, and also hollow profiled fiber, and the corresponding heat preservation performance is also continuously improved with the development of technology. The far infrared powder has the problems of low fiber strength, easy generation of floating and broken ends in spinning and the like due to the fact that the far infrared powder is difficult to add and disperse in the spinning process, and the like, so that the production efficiency of the existing functional fiber containing the far infrared powder is low, the quality is not high, and the performance is not enough.

Disclosure of Invention

In view of the above, the invention provides a preparation method and application of a thermal-insulation bacteriostatic functional fiber, so as to solve the defects of low preparation efficiency and insufficient performance of the functional fiber in the prior art.

The invention discloses a preparation method of a fiber with warm-keeping and bacteriostatic functions, which comprises the following steps:

s1, preparing functional powder: s11, firstly, dissolving bismuth nitrate powder in an ethylene glycol solution to prepare a bismuth nitrate solution for later use; s12, dispersing polyacrylic resin in an ethylene glycol solution, and stirring with ammonia water to dissolve the polyacrylic resin in the ethylene glycol solution to prepare a polyacrylic acid mixed solution; s13, adding potassium iodide into the polyacrylic acid mixed solution, dissolving, and obtaining a functional powder precursor solution after the solution is clarified; s14, dropwise adding the bismuth nitrate solution prepared in the step S1 into the functional powder precursor solution under ultrasonic and rapid stirring to perform ultrasonic stirring reaction for several hours; s15, adding tungsten nitrate powder, carrying out dissolving and adsorption reaction, continuously carrying out ultrasonic stirring reaction for a plurality of hours, filtering, and washing with deionized water for a plurality of times to obtain filter residue; s16, calcining the filter residue in an aerobic environment at 450-750 ℃ for several hours, and then calcining in an aerobic environment at 800-1000 ℃ to prepare the functional powder.

s2, preparing functional polyester chips: putting functional powder, terephthalic acid and ethylene glycol into a container, adding a catalyst, an ether inhibitor and an antioxidant into the container, pulping to prepare pulping liquid, then carrying out pressurized esterification reaction on the pulping liquid to prepare esterified pulp, carrying out pre-polycondensation reaction and final polycondensation reaction on the esterified pulp, and carrying out melt granulation to prepare functional polyester chips;

S3, preparing the fiber with the functions of heat preservation and bacteriostasis: and (3) performing high-pressure melting extrusion on the functional polyester chips, cooling by circular air blowing, bundling and oiling, drafting and heat setting, and winding to prepare the thermal-insulation antibacterial functional fiber.

As a preferable scheme of the present invention, in the step S11, the mass fraction of bismuth nitrate in the bismuth nitrate solution is 5 to 15%; in the step S12, the mass fraction of polyacrylic acid in the polyacrylic acid mixed solution is 5-15%; in the step S13, the mass fraction of potassium iodide in the functional powder precursor solution is 5 to 15%.

In a preferred embodiment of the present invention, in the step S14, the volume ratio of the functional powder precursor solution to the bismuth nitrate solution is 1:0.25 to 1: 0.50.

In a preferred embodiment of the present invention, in the step S15, the addition amount of the tungsten nitrate powder is 5 to 10% by mass of the functional powder precursor solution.

In a preferred embodiment of the present invention, in the step S2, the molar ratio of the terephthalic acid to the ethylene glycol is 1:1.05 to 1.25; the mass ratio of the functional powder to the glycol is 1: 50-200; the mass fraction of the catalyst relative to the terephthalic acid is 0.05 percent; the mass fraction of the ether inhibitor relative to the terephthalic acid is 0.05 percent; the antioxidant was 0.05% by mass relative to terephthalic acid.

In a preferred embodiment of the present invention, in step S2, the catalyst is ethylene glycol antimony, the anti-ether agent is sodium acetate, and the antioxidant is triphenyl phosphate.

In the step S2, in the pressure esterification process, the pressure is 0.35 to 0.45MPa, the esterification temperature is 230 to 245 ℃, and the esterification time is 2.5 to 3.0 hours; the pre-polycondensation reaction is normal-pressure polycondensation, the pre-polycondensation temperature is 250-260 ℃, and the pre-polycondensation time is 0.5-1.5 h.

In a preferred embodiment of the present invention, in step S2, the final polycondensation reaction is a vacuum polycondensation, which is performed first by a low vacuum polycondensation and then by a high vacuum polycondensation; the vacuum degree of the low vacuum polycondensation is 500-5000 Pa, the low vacuum polycondensation time is 0.5-1.0 h, the vacuum degree of the high vacuum polycondensation is 50-100 Pa, and the high vacuum polycondensation time is 1.0-3.0 h.

The invention also discloses an application of the warm-keeping bacteriostatic functional fiber, and the prepared warm-keeping bacteriostatic functional fiber is applied to cloth.

the prepared heat-insulating bacteriostatic functional fiber has the bacteriostatic rate of 95-99% on staphylococcus aureus and the bacteriostatic rate of 95-98% on escherichia coli; the far infrared emissivity at the wavelength of 1.0-5.0 microns is 20-50%, the heat insulation performance of a fabric sample prepared by the heat-insulation and bacteriostatic functional fiber is subjected to heat radiation for 1min at the temperature of 100 ℃ (15cm), the surface temperature difference of the fabric sample before and after heating is 1.0-2.0 ℃, and the surface temperature of the fabric is higher than 100 ℃.

according to the technical scheme, the invention has the beneficial effects that: oxidizing bismuth nitrate by using potassium iodide to form bismuth oxyiodide particles which have high-efficiency antibacterial catalysis effect and hollow structure, and then passivating and coating the surfaces of the bismuth oxyiodide particles by using polyacrylic acid to form bismuth oxyiodide capsule particles with hollow microcapsule structures; then dissolving and adsorbing the tungsten nitrate powder particles into bismuth oxyiodide capsule particles, so that the prepared functional powder has the effects of keeping warm and far infrared emission and absorption; meanwhile, bismuth oxyiodide capsule particles with a hollow microcapsule structure are dispersed in a polyester matrix, and the bismuth oxyiodide capsule particles are not subjected to high shearing action in the polymerization process, so that the bismuth oxyiodide capsule particles can be uniformly dispersed in the polymerization matrix to form functional polyester chips; finally, bismuth oxyiodide capsule particles with hollow microcapsule structures are sheared at high pressure and high speed through spinneret orifices in a high-pressure melt spinning process to destroy the hollow structures, so that the antibacterial bismuth oxyiodide capsule particles are dispersed on fibers, and the spherical bismuth oxyiodide capsule particles with hollow structures are influenced by shearing action in a drafting shearing process and are favorably and quickly dispersed on the surfaces of functional fibers, so that the functional fibers are endowed with excellent antibacterial performance due to low addition, and the fiber with the functions of keeping warm and inhibiting bacteria is prepared; obviously, the bismuth oxyiodide capsule particles with efficient antibacterial catalysis effect and hollow structure are uniformly dispersed in the warm-keeping bacteriostatic functional fiber, so that the preparation efficiency of the warm-keeping bacteriostatic functional fiber is improved, the warm-keeping bacteriostatic performance of the functional fiber is improved, the defects of low preparation efficiency and insufficient performance of the functional fiber in the prior art are overcome, and the aim of efficiently preparing the warm-keeping bacteriostatic functional fiber is fulfilled.

Drawings

FIG. 1 is an XRD spectrum of a functional powder prepared by the present invention;

FIG. 2 is a scanning electron microscope image of the functional powder prepared by the present invention;

FIG. 3 is a sectional electron microscope atlas of the warm-keeping bacteriostatic functional fiber prepared by the invention.

Detailed Description

The following examples are intended to illustrate the invention in further detail, but are not intended to limit the invention in any way, and unless otherwise indicated, the reagents, methods and apparatus used in the invention are conventional in the art, and are not intended to limit the invention in any way.

The invention discloses a preparation method of a fiber with warm-keeping and bacteriostatic functions, which comprises the following steps:

s1, preparing functional powder: s11, firstly, dissolving bismuth nitrate powder in an ethylene glycol solution to prepare a bismuth nitrate solution for later use; s12, dispersing polyacrylic resin in an ethylene glycol solution, and stirring with ammonia water to dissolve the polyacrylic resin in the ethylene glycol solution to prepare a polyacrylic acid mixed solution; s13, adding potassium iodide into the polyacrylic acid mixed solution, dissolving, and obtaining a functional powder precursor solution after the solution is clarified; s14, dropwise adding the bismuth nitrate solution prepared in the step S1 into the functional powder precursor solution under ultrasonic and rapid stirring to perform ultrasonic stirring reaction for several hours; s15, adding tungsten nitrate powder, carrying out dissolving and adsorption reaction, continuously carrying out ultrasonic stirring reaction for a plurality of hours, filtering, and washing with deionized water for a plurality of times to obtain filter residue; s16, calcining the filter residue in an aerobic environment at 450-750 ℃ for several hours, and then calcining in an aerobic environment at 800-1000 ℃ to prepare the functional powder. In the step S11, the mass fraction of the bismuth nitrate in the bismuth nitrate solution is 5-15%; in the step S12, the mass fraction of polyacrylic acid in the polyacrylic acid mixed solution is 5-15%; in the step S13, the mass fraction of potassium iodide in the functional powder precursor solution is 5 to 15%. In the step S14, the volume ratio of the functional powder precursor solution to the bismuth nitrate solution is 1:0.25 to 1: 0.50. In the step S15, the addition amount of the tungsten nitrate powder is 5 to 10% by mass of the functional powder precursor solution. In the invention, the steps are mainly that firstly, bismuth nitrate reacts with potassium iodide to generate bismuth oxyiodide, then tungsten ions are introduced to the bismuth oxyiodide, and the bismuth oxyiodide antibacterial agent is loaded with tungsten oxide powder through calcination in an aerobic environment, so that the functional powder has an antibacterial effect and a far infrared emission function. In the reaction process, polyacrylic acid is mainly dispersed into small balls through emulsification, an ammonium polyacrylate salt solution is formed on the surface of polyacrylic acid through the pH regulation of ammonia water, bismuth ions in bismuth nitrate in an alkaline environment are complexed with amino groups, then potassium iodide and the bismuth ions react to generate bismuth oxyiodide microspheres, tungsten hydroxide precipitate is loaded on the surfaces of the bismuth oxyiodide microspheres through complexation and precipitation, after the reaction is finished, the polyacrylic acid in a core layer can be removed through high-temperature calcination, and meanwhile, the loading of tungsten oxide with a far infrared emission function on the bismuth oxyiodide microspheres is realized through the regulation of a calcination process, so that the problems that conventional loaded microsphere particles are too large, the stability of tungsten oxide in the powder is poor, and the particle size of functional powder is large and the dispersibility is poor are solved. The aerobic environment set in step S16 is mainly for complete decomposition of polyacrylic acid, so as to avoid the residue of polyacrylic acid from affecting the color of the functional powder, and the distributed pyrolysis is mainly decomposition of polyacrylic acid at low temperature, and is mainly beneficial to formation of tungsten oxide at high temperature. In addition, the specific ratio of each product in step S1 is mainly to regulate the ratio of the core layer and the shell layer, the core layer contains polyacrylic acid with too much content and has too large particle size, which results in a thinner subsequent wall layer, which is easy to break the wall during calcination and difficult to form spherical complete functional powder, the core layer is too little and has thicker wall layer, which results in a particle size process of the wall layer, in the subsequent processing, the crushing pressure of the wall layer is increased, which results in difficulty in crushing and uniform dispersion in the melt spinning process, and the content of tungsten oxide powder is too low, which has poor far infrared effect, which results in too much bluing color and increased particle size of the powder.

S2, preparing functional polyester chips: putting functional powder, terephthalic acid and ethylene glycol into a container, adding a catalyst, an ether inhibitor and an antioxidant into the container, pulping to prepare pulping liquid, then carrying out pressurized esterification reaction on the pulping liquid to prepare esterified pulp, carrying out pre-polycondensation reaction and final polycondensation reaction on the esterified pulp, and carrying out melt granulation to prepare functional polyester chips; in the step S2, the molar ratio of the terephthalic acid to the ethylene glycol is 1: 1.05-1.25; the mass ratio of the functional powder to the glycol is 1: 50-200; the mass fraction of the catalyst relative to the terephthalic acid is 0.05 percent; the mass fraction of the ether inhibitor relative to the terephthalic acid is 0.05 percent; the antioxidant was 0.05% by mass relative to terephthalic acid. In the step S2, the catalyst is ethylene glycol antimony, the ether inhibitor is sodium acetate, and the antioxidant is triphenyl phosphate. In the step S2, in the pressure esterification process, the pressure is 0.35-0.45 MPa, the esterification temperature is 230-245 ℃, and the esterification time is 2.5-3.0 h; the pre-polycondensation reaction is normal-pressure polycondensation, the pre-polycondensation temperature is 250-260 ℃, and the pre-polycondensation time is 0.5-1.5 h. In the step S2, the final polycondensation reaction is vacuum polycondensation, and low vacuum polycondensation is performed first, and then high vacuum polycondensation is performed; the vacuum degree of the low vacuum polycondensation is 500-5000 Pa, the low vacuum polycondensation time is 0.5-1.0 h, the vacuum degree of the high vacuum polycondensation is 50-100 Pa, and the high vacuum polycondensation time is 1.0-3.0 h. In step S2, the functional powder is mainly prepared by a conventional polyester polymerization process, and the main purpose is to fully disperse and uniformly distribute the functional powder on the functional polyester chips.

S3, preparing the fiber with the functions of heat preservation and bacteriostasis: and (3) performing high-pressure melting extrusion on the functional polyester chips, cooling by circular air blowing, bundling and oiling, drafting and heat setting, and winding to prepare the thermal-insulation antibacterial functional fiber.

The invention also discloses an application of the warm-keeping bacteriostatic functional fiber, and the prepared warm-keeping bacteriostatic functional fiber is applied to cloth.

The prepared heat-insulating bacteriostatic functional fiber has the bacteriostatic rate of 95-99% on staphylococcus aureus and the bacteriostatic rate of 95-98% on escherichia coli; the far infrared emissivity at the wavelength of 1.0-5.0 microns is 20-50%, the heat insulation performance of a fabric sample prepared by the heat-insulation and bacteriostatic functional fiber is subjected to heat radiation for 1min at the temperature of 100 ℃ (15cm), the surface temperature difference of the fabric sample before and after heating is 1.0-2.0 ℃, and the surface temperature of the fabric is higher than 100 ℃.

bismuth oxyiodide has excellent antibacterial and catalytic effects, is widely applied to preparation of antibacterial powder, and has large antibacterial activity, so that the bismuth oxyiodide is difficult to be added and dispersed in situ in a polymer, and is difficult to be applied to a polyester matrix; in the technical scheme disclosed by the invention, the antibacterial property of bismuth oxyiodide is utilized, the surface of the bismuth oxyiodide is passivated and coated by polyacrylic acid, in the process of coating bismuth oxyiodide, a hollow microcapsule structure is prepared, which can not only meet the requirement of dispersing bismuth oxyiodide in a polyester matrix, and the spherical antibacterial nano particles are not subjected to high shearing action in the polymerization process, so that the spherical antibacterial nano particles can be uniformly dispersed in a polymerization matrix, and the hollow structure can be destroyed by utilizing the high-pressure high-speed shearing of a spinneret orifice in the melt spinning process of the bismuth oxide with the hollow structure, thereby realizing the dispersion of the antibacterial bismuth oxyiodide on the fiber, and during the drafting and shearing process of the spherical hollow bismuth oxyiodide, the fiber surface is beneficial to fast dispersion under the influence of shearing action, so that the fiber is endowed with excellent antibacterial performance at low addition. Meanwhile, in the aspect of preparing functional powder, the excellent far infrared absorption and reflection effects are given to the powder by utilizing the far infrared emission function containing the tungsten nitrate structure, so that the functional powder has the warm-keeping effect and the far infrared emission and absorption effects, and the excellent warm-keeping function of the fiber is ensured on the fiber fabric through the design of the fiber hollow structure.

It is apparent that, more specifically, as shown in fig. 1 to 3, the present invention oxidizes bismuth nitrate with potassium iodide to form bismuth oxyiodide particles having a highly efficient antibacterial catalytic effect and a hollow structure, and then passivates and coats the surfaces of the bismuth oxyiodide particles with polyacrylic acid to form bismuth oxyiodide capsule particles having a hollow microcapsule structure; then dissolving and adsorbing the tungsten nitrate powder particles into bismuth oxyiodide capsule particles, so that the prepared functional powder has the effects of keeping warm and far infrared emission and absorption; meanwhile, bismuth oxyiodide capsule particles with a hollow microcapsule structure are dispersed in a polyester matrix, and the bismuth oxyiodide capsule particles are not subjected to high shearing action in the polymerization process, so that the bismuth oxyiodide capsule particles can be uniformly dispersed in the polymerization matrix to form functional polyester chips; finally, bismuth oxyiodide capsule particles with hollow microcapsule structures are sheared at high pressure and high speed through spinneret orifices in a high-pressure melt spinning process to destroy the hollow structures, so that the antibacterial bismuth oxyiodide capsule particles are dispersed on fibers, and the spherical bismuth oxyiodide capsule particles with hollow structures are influenced by shearing action in a drafting shearing process and are favorably and quickly dispersed on the surfaces of functional fibers, so that the functional fibers are endowed with excellent antibacterial performance due to low addition, and the fiber with the functions of keeping warm and inhibiting bacteria is prepared; obviously, the bismuth oxyiodide capsule particles with efficient antibacterial catalysis effect and hollow structure are uniformly dispersed in the warm-keeping bacteriostatic functional fiber, so that the preparation efficiency of the warm-keeping bacteriostatic functional fiber is improved, the warm-keeping bacteriostatic performance of the functional fiber is improved, and the aim of efficiently preparing the warm-keeping bacteriostatic functional fiber is fulfilled.

The following are specific examples: