CN114808170B - Light-colored bactericidal heat-storage functional fiber, preparation method thereof, and fiber product - Google Patents

Abstract

The invention relates to a light-colored sterilization and heat accumulation functional fiber, a preparation method thereof and a fiber product, wherein the sterilization and heat accumulation functional fiber consists of sterilization and heat accumulation particles and a high polymer matrix, and the sterilization and heat accumulation particles are obtained by coating compound powder of nano tungsten bronze powder/photocatalyst nano powder with a porous material with a mesoporous pore structure.

Description

Light-colored bactericidal heat-storage functional fiber, preparation method thereof, and fiber product

Technical Field

The present invention relates to a novel functional fiber, a preparation method thereof and a fiber product, and in particular to a novel heat-storage and sterilization functional fiber based on photothermal effect, a preparation method thereof and a fiber product.

Background technique

With the continuous development of science and technology and the improvement of human living standards, people's requirements for clothing are constantly changing. New functional fiber materials are required to achieve both warmth retention and avoid the impact of heavy clothing on comfort, while also having antibacterial effects. The emergence of heat storage fibers can achieve the above effects. The principle is that heat storage fibers can actively absorb heat from the human body or external radiation and store it in the fibers, thereby achieving continuous heat release. The core of heat storage fiber technology is the selection of new heat storage functional materials. In existing research work, there are many types of heat storage functional materials, the mainstream of which include bamboo charcoal, coffee carbon, graphene, natural minerals, carbides, nitrides, metal particles, etc.

For example: Chinese patents CN201310392735, CN201410546018, and CN201620824033 use bamboo charcoal as a heat storage functional material, while Chinese patents CN201320282112 and CN201810867861 use coffee charcoal as a heat storage functional material. The above carbon heat storage functional materials are easy to prepare and low in cost, but the heat storage efficiency is limited, so the amount added is large, and the fabric can only be black or brown and cannot be dyed, which limits the application. Chinese patent CN201610474260 uses graphene. Although it has high heat storage efficiency and a small amount of addition, it can only be black fiber, and it is expensive, which reduces practicality. Chinese patents CN201910020877 and CN201811206953 use natural mineral functional fillers, Chinese patent CN201610528052 uses inorganic carbides such as zirconium carbide and silicon carbide, Chinese patent CN201710346483 uses titanium nitride, and Chinese patents CN201210148274 and CN201210151412 disclose the use of mixed metal microparticles to modify polymer fibers to prepare heat storage fibers. However, the above methods all have defects such as large addition amount, large powder specific gravity, easy enrichment and shedding during the melting process, and basically black color, which makes subsequent dyeing difficult.

In summary, in the existing heat-generating fiber process, almost all fibers are black or dark in color, and most functional materials require a large amount of addition. Therefore, it is urgent to explore a light-colored fiber with high heat storage efficiency, which will help improve the fiber's heat storage capacity, mechanical properties, and the applicability of subsequent fabrics.

Alkali metal tungsten bronze inorganic ceramic materials with blue color are known. However, the color of the alkali metal tungsten bronze material itself is dark blue, and its absorption of visible light is lower than that of black materials, which reduces the light absorption and heat storage effect to a certain extent; and its own dark blue appearance, if directly made into heat storage fiber, the color is still dark, and the dyeability is still insufficient, so it needs to be modified by compounding with other materials. Chinese patent CN201710678395 composites tungsten bronze with tin oxide and titanium nitride to enhance the light absorption capacity and deepen the color, thereby reducing the dyeability of the product; Chinese patent CN201910647223 directly coats tungsten bronze with carbon to obtain a darker black tungsten bronze. The above methods only consider the improvement of the heat storage performance of tungsten bronze composite fibers, but ignore their dyeability, so their applicability is limited. Research on the use of tungsten bronze to prepare dyeable high-efficiency heat storage fibers is currently blank.

Summary of the invention

In view of the shortcomings of the above existing heat storage fibers, the purpose of the present invention is to provide a new type of tungsten bronze/photocatalyst composite bactericidal heat storage functional fiber to achieve the preparation of light-colored and efficient heat storage fibers. The product has the characteristics of efficient heat storage function, efficient bactericidal function and light color.

In the first aspect, the present invention provides a bactericidal heat storage functional fiber, which is composed of bactericidal heat storage particles and a high molecular polymer matrix, wherein the bactericidal heat storage particles are obtained by coating a composite powder of nano tungsten bronze powder/photocatalyst nano powder with a porous material having a mesoporous pore structure. According to the composition of the present invention, after the tungsten bronze powder is compounded with the catalytic photocatalyst powder, a nano inorganic material having mesoporous properties is used for porous coating modification, and the fiber has high efficiency infrared light absorption and heat storage function, antibacterial function, and moisture absorption and heat storage function, and can also improve the problem that dark fibers are difficult to dye.

The content of the bactericidal heat-storing particles may be 0.2-20 wt. % of the fiber.

The photocatalyst nano powder may be at least one of titanium dioxide, doped titanium dioxide, zinc oxide, and bismuth vanadate. The particle size of the photocatalyst nano powder may be 5 to 500 nm.

The nano tungsten bronze powder has a general formula of M _x WO ₃ , wherein M can be one or more elements selected from alkali metal elements, alkaline earth metal elements, and transition metal elements, and in the general formula, 0<x≤1. The particle size of the nano tungsten bronze powder can be 5 to 500 nm.

The mass ratio of the photocatalyst nano powder to the nano tungsten bronze powder may be (100:1) to (1:10).

The porous material may have a mesoporous pore structure of 2-50 nm. The material with pores of 2-50 nm has a stronger ability to actively absorb water vapor in the air.

The coating thickness of the porous material may be 0.05 to 5 microns.

The particle size of the bactericidal heat-storing particles may be 0.1 to 10 microns.

The material of the high molecular polymer matrix may be at least one of polyamide, polyethylene, polyethylene terephthalate, polypropylene, and polybutylene terephthalate.

The fiber can be one of solid long fiber, solid short fiber and hollow short fiber. The hollow cross section of the hollow short fiber can be one of single hole circle, single hole triangle, four holes circle or seven holes circle.

The appearance color of the bactericidal heat storage functional fiber can be white or light blue. The color range of the bactericidal heat storage functional fiber of one embodiment of the present invention is characterized by CIE color coordinates, color coordinates (x, y), where 0.05<x<0.33, 0.1<y<0.35.

In a second aspect, the present invention provides a fiber product obtained by processing any of the above-mentioned bactericidal heat storage functional fibers, which can be used in various applications such as clothing, household fabrics, medical fabrics and other fiber products that require high heat storage performance, effective antibacterial properties, and easy dyeing, and other industrial fiber materials.

In the third aspect, the present invention provides a method for preparing the above-mentioned bactericidal heat storage functional fiber, which is characterized by comprising: mixing nano tungsten bronze powder with photocatalyst nano powder, adding porous material while stirring to obtain a mixed powder; sintering the mixed powder to prepare a slurry; mixing the slurry with a powder of a polymer and heating to volatilize the solvent to obtain a mixture; granulating the mixture to obtain a masterbatch; and spinning the masterbatch. In the method of the present invention, mixed particles of a physical mixture of tungsten bronze powder and photocatalyst powder are coated in a porous material, and the particles of photocatalyst and tungsten bronze are stirred and mixed to obtain a composite powder, which enters the pores during mixing with the porous particles and is fixed in the pores by sintering.

The spinning molding may include: mixing the master batch and then extruding it.

The spinning process may also include: mixing the masterbatch with white chips made of the high molecular weight polymer and then extruding the mixture.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 shows the appearance of the light-colored functional fiber described in Example 1;

FIG2 shows an infrared thermal imaging test of the fiber heat storage capacity of the fiber product of Example 2;

FIG3 shows a comparison diagram of the fabric of Example 3 before and after photocatalytic bacteriostasis;

FIG. 4 shows the color range of the bactericidal and heat-storage functional fiber (light blue fiber) obtained according to an embodiment of the present invention.

Detailed ways

The present invention is further described below by the following embodiments. It should be understood that the following embodiments are only used to illustrate the present invention, but not to limit the present invention.

The present disclosure relates to a light-colored functional fiber and its fiber products (mainly fabric products), wherein the fiber contains tungsten bronze/photocatalyst nano-ceramic powder, and the nano-ceramic powder is modified by porous coating, and has the dual functions of moisture absorption, light absorption and heat storage, and sterilization. The fiber can have a light-colored appearance (light blue), and is easy to be post-processed such as dyeing. The fiber and fabric have strong heat storage capacity, can effectively keep warm, and reduce the weight of textiles. The functional fiber and fabric can vary in color from white to light blue depending on the amount of nano-functional ceramic powder added, but they are all light colors, so they are easy to dye into various dark colors, that is, they have strong dyeability and are widely applicable.

Implementation form 1.

The bactericidal heat storage functional fiber of the present embodiment 1 is composed of bactericidal heat storage particles and a polymer matrix, and is a fiber made of a polymer modified by bactericidal heat storage particles. The bactericidal heat storage particles are obtained by coating a composite powder of nano tungsten bronze powder/photocatalyst nano powder with a porous material having a mesoporous pore structure. The composite powder can be located (adsorbed) on the surface and pore structure of the porous material. For example, the porous material has mesopores and macropores exceeding 1 μm, and the surface area in the pores is large, which is easy to adsorb the powder material and also adsorb on the surface.

The tungsten bronze powder has a general formula of M _x WO ₃ , wherein the element M can be an alkali metal such as lithium, sodium, potassium, rubidium, cesium, an alkaline earth metal such as beryllium, magnesium, calcium, strontium, barium, radium, a transition metal element, etc. in the periodic table, and 0＜x≤1 in the general formula. Preferably, the element M is Cs, Li, Na, K, Rb, which can make tungsten oxide blue, and more preferably Cs, which further improves the infrared absorption efficiency. In this embodiment, the tungsten bronze powder preferably has a high visible light transmittance (over 70%), and is easy to prepare a light-colored composite material. In a preferred embodiment, the tungsten bronze powder is cesium tungsten bronze Cs _0.32 WO ₃ , which can further efficiently absorb ultraviolet light, infrared light, and heat. For example, the Cs _0.32 WO ₃ powder is directly spread into a thin film (spread out and directly test the optical properties (transmittance) of the powder), which can achieve a visible light transmittance of more than 70%, a near-infrared absorption rate of up to 95%, and an ultraviolet absorption rate of up to 99%. The particle size (particle diameter) of the selected tungsten bronze powder can be 5 to 500 nm. In this embodiment, the tungsten bronze powder can be inserted into the pores of the porous material (porous layer gaps) during the mixing of the composite powder and the porous material described later.

The photocatalyst nano powder disclosed in the present invention can be at least one of titanium dioxide, doped titanium dioxide, zinc oxide, and bismuth vanadate. Preferably, titanium dioxide photocatalyst doped with silver, iron, etc. is used, and specific metal ions are doped to effectively enhance the photocatalytic bactericidal ability, and the doping amount can be 0.5% to 5%. The particle size of the photocatalyst nano powder can be 5 to 500nm. In this embodiment, the photocatalyst nano powder can be inserted into the pores of the porous material (porous layer gaps) in the mixing of the composite powder and the porous material described later. The photocatalyst nano powder can play a photocatalytic role. After absorbing the energy of sunlight or other light sources, it activates the electrons on the surface of the particles, causing them to leave their original orbits and generate positively charged holes at the same time. The escaping electrons have strong reducing properties, while the holes have strong oxidizing properties. The electrons and holes react with the water vapor in the air to generate active oxygen and hydroxyl free radicals, respectively, and the bacteria are oxidized and decomposed into carbon dioxide and water, which plays a bactericidal and antibacterial role. Moreover, the bactericidal properties of the above-mentioned photocatalyst are highly stable and can sterilize for a long time; it is non-toxic and harmless, harmless to human contact, and suitable for use in underwear. At the same time, the photocatalyst nanopowder is white or nearly white, and when compounded with tungsten bronze, it can improve the dark blue color of tungsten bronze itself. In the tungsten bronze/photocatalyst composite powder, the composite mass ratio of the two (tungsten bronze: photocatalyst) can be 100:1 to 1:10. When the composite mass ratio of the two is above 100:1, the color can be suppressed from being darker and exceeding the CIE color coordinate range. When the composite mass ratio of the two is below 1:10, the heat storage effect can be suppressed from being affected.

In the sterilization and heat storage particles, the composite powder of nano tungsten bronze powder/photocatalyst nano powder is coated by a porous coating layer composed of a porous material with a mesoporous pore structure. For example, the composition of the porous coating layer can be at least one of nano hydroxyapatite, nano zeolite, sepiolite, and diatomaceous earth. The thickness of the porous layer (the coating thickness of the porous material) can be 0.05 to 5 microns. The porous layer used is a mesoporous material, which contains a large number of mesoporous pore structures with a diameter of 2 to 50 nm. The presence of these mesoporous structures makes the porous layer have excellent hygroscopic properties. In the application of functional fibers, it can absorb moisture in the environment to achieve hygroscopic heat storage, and cooperate with tungsten bronze to achieve the dual heat storage functions of light absorption and moisture absorption. In the present invention, the hygroscopic effect can be coordinated with the light absorption and heat storage of tungsten bronze to achieve a better heat storage effect and greatly improve the heat storage capacity. In addition, because the porous layer has a large surface area, it also has a good adhesion effect on small molecules such as bacteria and fungi, attracting bacteria and fungi to move toward the photocatalyst of the fiber to promote sterilization. Thus, the use of the porous layer promotes the sterilization of the fiber. Moreover, the porous layer itself, as a coating layer of the compound powder, can prevent the tungsten bronze/photocatalyst particles from actually directly contacting the polymer in the fiber, which will greatly reduce the damage of the tungsten bronze and photocatalyst nanoparticles to the polymer matrix, avoid the problem of incompatibility between the compound powder and the polymer, and further increase the service life of the fiber. In addition, the use of the porous layer further reduces the specific gravity of tungsten bronze in the composite structure and improves the dark blue color of tungsten bronze itself.

The content of the bactericidal heat storage particles can account for 0.2-20wt.% of the fiber as a whole. The content of the high molecular polymer can account for 80%-99.8% of the fiber weight. The appearance of the bactericidal heat storage functional fiber can be white or light blue. The fiber color can gradually transition from white to light blue as the amount of tungsten bronze/photocatalyst composite powder increases. Both are light colors.

The particle size of the bactericidal heat storage particles disclosed in the present invention can be 0.1 to 10 microns. After the tungsten bronze (general formula M _x WO ₃ ) powder is compounded with the catalytic photocatalyst powder, a nano inorganic material with mesoporous characteristics is used for porous coating modification, which has a high-efficiency infrared absorption function and antibacterial effect, and plays an excellent light absorption and heat storage effect and moisture absorption effect. In addition, it can prevent the direct contact between the tungsten bronze/photocatalyst nano ceramic powder and the substrate, playing a protective role.

The sterilization and heat storage functional fiber can be a solid long fiber, a solid short fiber, or a hollow short fiber. The hollow cross-section of the hollow short fiber can be a single-hole circular, a single-hole triangle, a four-hole circular, or a seven-hole circular shape that can be realized in the existing process. Hollowness further contributes to the heat storage effect. The color range of the light blue fiber of this embodiment is characterized by CIE color coordinates, color coordinates (x, y), where 0.05<x<0.33, 0.1<y<0.35 (as shown in the light blue range of Figure 4).

The fiber can be further woven to obtain a light-colored bactericidal heat storage fabric, which is made of the fiber of the present invention or a blend of the fiber of the present invention and common textile materials such as cotton, linen, silk, and other high molecular polymer fibers. The blending mass ratio of the bactericidal heat storage functional fiber and common textile materials such as cotton, linen, silk, and other high molecular polymer fibers is not particularly limited, and can be a commonly used blending mass ratio in the art.

The following is an exemplary description of the method for preparing the bactericidal and heat-storing functional fiber disclosed in the present invention.

First, after mixing the nano tungsten bronze powder and the photocatalyst nano powder, the porous material is added while stirring to obtain a mixed powder. In some embodiments, the tungsten bronze and photocatalyst nano powders can be accurately weighed according to the ratio, sent into a mixer and mixed evenly to obtain a compound powder, and then the porous material is added while mixing. The mass ratio of the compound powder to the porous material can be 1: (1.9-20). The porous material raw material can have a size between 0.1 and 10 microns.

Next, the mixed powder is sintered and prepared into a slurry. In some embodiments, the mixed powder can be poured into a rotary atmosphere furnace, sintered under a nitrogen and hydrogen mixer protective atmosphere, treated at 150-300°C for 1-6 hours, and rotated while heating at a speed of 10-100 rpm. In some embodiments, the sintered powder, dispersing aid, and solvent can be weighed according to the ratio of powder: dispersing aid: solvent = 1:0.1-0.8:3-10, transferred to a sand mill, and fully ground with a ball mill with a diameter of 0.3 mm or less until a uniform and stable nano-color paste is obtained. Among them, the solvent can be at least one of water, ethyl acetate, xylene, acetone, ethanol, isopropanol, and propylene glycol methyl ether acetate.

Next, the slurry is mixed with a powder of a polymer and heated to evaporate the solvent to obtain a mixture. In some embodiments, the nano-color paste and the polymer powder can be weighed in proportion, loaded into a mixer, and mixed while heating until the solvent is fully evaporated to obtain a mixture. The polymer (powder) used as the material of the polymer matrix can be a commonly used chemical fiber preparation material such as polyamide, polyethylene, polyethylene terephthalate, polypropylene, polybutylene terephthalate, etc. The slurry and the polymer powder can be mixed in a mass ratio of (0.1-0.5): (0.5-0.9) and heated to evaporate the solvent. When the color paste made of powder in the process disclosed in the present invention is mixed with the polymer powder, the viscosity is moderate, it can be evenly mixed, and the material is easy to take out from the mixer.

Next, the mixture is granulated to obtain masterbatch, and the masterbatch is spun into a fiber. In some embodiments, the mixture can be granulated by an extruder with a melting temperature of 250-300° C. to obtain functional plastic masterbatch.

Spinning molding may include: mixing the masterbatch and then extruding. Spinning molding may also include: mixing the masterbatch with white chips made of the polymer and then extruding. The functional masterbatch of the present invention and blank polymer masterbatch may be mixed and drawn as a whole. In some embodiments, the functional plastic masterbatch may be mixed with white chips of polymer of the same material in a ratio of functional plastic masterbatch: white chips = 1:0 to 5, and then extrude filaments or staples in a fiber extruder, or hollow staples may be obtained using a hollow template. The obtained fibers may be woven into corresponding fabrics on a loom.

The following examples are further cited to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above content of the present invention belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only an example within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description of this article, and are not limited to the specific values exemplified below;

In the following examples, the reagents, materials and instruments used are conventional reagents, conventional materials and conventional instruments unless otherwise specified, and are all commercially available. The reagents involved can also be synthesized by conventional synthesis methods.

Example 1

A) Weigh 5 kg of cesium tungsten bronze Cs _0.32 WO ₃ powder with a particle size of 50 nm and 2 kg of photocatalyst silver-doped titanium dioxide powder with a particle size of 20 nm, put them into a mixer and mix them evenly for 30 minutes, then slowly add 20 kg of nano-hydroxyapatite while mixing, and continue stirring for 30 minutes;

B) pouring the mixed powder into a rotary atmosphere furnace, continuously introducing a nitrogen and hydrogen mixture (in which hydrogen accounts for 28%), maintaining a rotation speed of 20 rpm, and sintering at 300° C. for 3 hours to obtain a composite powder, which is sieved through a 200-mesh sieve to remove large particles that appear during sintering;

C) Weigh 10 kg of composite powder, use 5 kg of wetting and dispersing agent provided by BYK and 40 kg of xylene, mix them thoroughly and evenly, put them into a sand mill and grind them to obtain dispersed color paste;

D) Put the dispersed color paste and 190 kg of polyamide (PA) polymer powder into a mixer, heat to 90°C and stir for 10 hours until the solvent is fully volatilized to obtain a mixture;

E) the mixture is granulated by an extruder with a melting temperature of 280° C. to obtain functional plastic masterbatch;

F) Weigh 100 kg of functional plastic masterbatch, mix and load into a fiber extruder, use a circular hollow staple template to extrude hollow staple fibers, and obtain 5D38 PA hollow staple fibers;

The obtained fiber appearance photograph is shown in FIG1 , and the fiber is light blue in color as a whole, represented by the color coordinates (0.17, 0.11).

Example 2

A) Weigh 10 kg of cesium tungsten bronze Cs _0.32 WO ₃ powder with a particle size of 50 nm and 1 kg of photocatalyst silver-doped titanium dioxide TiO ₂ powder with a particle size of 20 nm, put them into a mixer and mix them evenly for 30 minutes, then slowly add 30 kg of nano zeolite while mixing, and continue stirring for 30 minutes;

B) pouring the mixed powder into a rotary atmosphere furnace, continuously introducing a nitrogen and hydrogen mixture (in which hydrogen accounts for 28%), maintaining a rotation speed of 20 rpm, and sintering at 300° C. for 3 hours to obtain a composite powder, which is sieved through a 200-mesh sieve to remove large particles that appear during sintering;

C) Weigh 10 kg of composite powder, use 3 kg of special additives (nano dispersant) provided by Shanghai Yihui Chemical Company, 40 kg of solvent propylene glycol methyl ether acetic acid, mix well, put into a sand mill and grind to obtain a dispersed color paste;

D) The dispersed color paste and 190 kg of polyethylene terephthalate (PET) polymer powder are placed in a mixer, heated to 90° C., and stirred for 10 hours until the solvent is fully volatilized to obtain a mixture;

E) the mixture is granulated by an extruder with a melting temperature of 280° C. to obtain functional plastic masterbatch;

F) 100 kg of functional plastic masterbatch and 200 kg of PET white chips were weighed, mixed, and then filaments were extruded in a fiber extruder, and the winding speed of the winder was 3200 m/min to obtain 125D/72F low-elastic yarn, and finally 75D/72F PET filament fibers were made by friction extension false twisting;

G) The obtained fiber is woven into fabric on a loom, and the fabric is light blue in color with a color coordinate of about (0.15, 0.25). Figure 2 shows the infrared thermal image test (heat storage effect) of the fiber product of Example 2. After irradiation with an infrared lamp for 1 minute, the infrared irradiation is removed and the infrared thermal image is taken with an infrared thermal imager. The results show that the surface temperature of the fiber of the present invention is significantly increased to 75°C. Compared with the commonly used ordinary cotton fiber, which can only be increased to 29°C under the same conditions, the heating effect is very obvious.

The obtained fabric photo and its thermal imager photo after 1 minute of exposure to sunlight are shown in Figure 2. The thermal image photo in the figure shows that the fabric temperature is obviously higher than the outside temperature, confirming the heat storage capacity.

Example 3

A) Weigh 1 kg of cesium tungsten bronze Cs _0.32 WO ₃ powder with a particle size of 50 nm and 10 kg of photocatalyst silver-doped titanium dioxide powder with a particle size of 20 nm, put them into a mixer and mix them evenly for 30 minutes, then slowly add 20 kg of nano-hydroxyapatite while mixing, and continue stirring for 30 minutes;

B) pouring the mixed powder into a rotary atmosphere furnace, continuously introducing a nitrogen and hydrogen mixture (in which hydrogen accounts for 28%), maintaining a rotation speed of 20 rpm, and sintering at 300° C. for 3 hours to obtain a composite powder, which is sieved through a 200-mesh sieve to remove large particles that appear during sintering;

C) Weigh 10 kg of composite powder, use 5 kg of wetting and dispersing agent provided by BYK and 40 kg of xylene, mix them thoroughly and evenly, put them into a sand mill and grind them to obtain dispersed color paste;

D) Put the dispersed color paste and 190 kg of polyamide (PA) polymer powder into a mixer, heat to 90°C and stir for 10 hours until the solvent is fully volatilized to obtain a mixture;

E) the mixture is granulated by an extruder with a melting temperature of 280° C. to obtain functional plastic masterbatch;

F) preparing the obtained functional masterbatch into filaments and weaving them into fabrics;

The overall fabric is close to light blue and whitish, with a color coordinate of approximately (0.28, 0.32). Bacterial colonies (white Staphylococcus aureus) were cultured on the fabric and then exposed to light for 1 hour to promote photocatalytic sterilization. The sterilization effect before and after illumination is shown in Figure 3. It can be seen that almost all the colonies were killed, proving the sterilization ability of this product.

Comparative Example 1:

The composite fiber without porous material is prepared, and the other steps are the same as those in Example 1.

The fiber prepared in comparative example 1 is not resistant to ultraviolet light. After ultraviolet aging for 1 hour, obvious fiber brittle cracks will appear, which will greatly reduce the service life of the product.

Claims (9)

1. The sterilization and heat accumulation functional fiber is characterized by comprising sterilization and heat accumulation particles and a high polymer matrix, wherein the sterilization and heat accumulation particles are nano tungsten bronze powder/photocatalyst nano powder compound powder and are obtained by coating a porous material with a mesoporous pore structure;

the photocatalyst nano powder is silver-doped titanium dioxide; the mass ratio of the photocatalyst nano powder to the nano tungsten bronze powder is (10:1) - (1:10);

the porous material with the mesoporous pore structure is nano hydroxyapatite or nano zeolite, the pore diameter of the macropores exceeds 1 mu m, and the pore diameter of the mesopores is 2-50 nm.

2. The heat and sterilization functional fiber according to claim 1, wherein the content of the heat and sterilization particles is 0.2 to 20wt.% of the heat and sterilization functional fiber.

3. According toThe sterilization and heat accumulation functional fiber as set forth in claim 1, wherein said nano tungsten bronze powder has M _x WO ₃ Wherein M is more than one element selected from alkali metal element, alkaline earth metal element and transition metal element, and x is more than 0 and less than or equal to 1.

4. The sterilization and heat accumulation functional fiber according to claim 1, wherein the coating thickness of the porous material with a mesoporous pore structure is 0.05-5 microns.

5. The heat and sterilization functional fiber according to claim 1, wherein the high molecular polymer matrix is at least one of polyamide, polyethylene terephthalate, polypropylene and polybutylene terephthalate.

6. The sterilization and heat accumulation functional fiber according to claim 1, wherein the sterilization and heat accumulation functional fiber is one of a solid long fiber, a solid short fiber and a hollow short fiber.

7. A fiber product, characterized in that the fiber product is processed by the sterilization and heat accumulation functional fiber in claim 1.

8. A method for preparing the sterilization and heat accumulation functional fiber as claimed in claim 1, which is characterized by comprising the following steps:

mixing nano tungsten bronze powder with photocatalyst nano powder, and adding a porous material with a mesoporous pore structure while stirring to obtain mixed powder;

preparing slurry after sintering the mixed powder;

mixing the slurry with the powder of the high molecular polymer matrix, and heating to volatilize the solvent to obtain a mixture;

granulating the mixture to obtain master batches; and

and spinning and forming the master batch.

9. The method of preparing according to claim 8, wherein the spinning forming comprises: mixing the master batch with the white slices made of the high-molecular polymer, and extruding.