A TPU 3D air fiber and its preparation method and application

Abstract

The present invention belongs to the technical field of textile materials and their preparation, and provides a TPU 3D air fiber, a preparation method thereof and an application. The present invention uses electrospinning to prepare TPU fibers to form a three-dimensional structure with ventilation channels; the introduction of organically modified montmorillonite increases the porosity and air permeability of the material; surface modification with polydopamine provides active sites for silver phosphate deposition and synergistically acts with silver phosphate to further improve the antibacterial effect; silver phosphate maintains good antibacterial effects under both light and dark conditions. The prepared TPU 3D air fiber has excellent air permeability and antibacterial properties, and is suitable for aspects such as sportswear, medical aids or household items.

Description

Technical Field

[0001] The present invention belongs to the technical field of textile materials and their preparation, and relates to a novel fiber material, in particular to a TPU 3D air fiber and its preparation method and application. Background Art

[0002] Existing textile materials have certain limitations in terms of breathability and comfort, especially in some application scenarios that require long-term skin contact, such as sportswear, medical aids, shoe linings, etc. Although common materials such as cotton and nylon have a certain degree of breathability to some extent, they still have deficiencies in moisture absorption and moisture discharge, and it is difficult to maintain a comfortable feeling during long-term use.

[0003] As a polymer material with excellent properties, TPU has gradually attracted attention due to its excellent elasticity, wear resistance, biocompatibility and environmental friendliness. However, although TPU performs well in terms of flexibility, durability and safety, how to prepare it into three-dimensional structured fibers with high breathability is still a major challenge in the current field of materials science. Especially in applications that require simultaneous consideration of breathability, strength and antibacterial properties, achieving this goal is particularly important. Therefore, there is an urgent need to develop a novel high-breathability TPU 3D air fiber and its preparation method to further improve the breathability and antibacterial properties of the material while retaining the original excellent properties of TPU, so as to meet the requirements of modern textile and medical fields for high-performance materials. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide a TPU 3D air fiber and its preparation method and application. The present invention uses electrospinning to prepare TPU fibers, so that a three-dimensional structure with ventilation channels is formed inside, thereby significantly improving the breathability of the material. Introducing organically modified montmorillonite during the electrospinning process can increase the porosity and breathability of the material; using polydopamine to modify the surface of the TPU fiber skeleton, polydopamine itself has good biocompatibility and can synergistically act with antibacterial components to further improve the antibacterial effect. At the same time, the formed polydopamine coating has good adhesion and activity, which can provide active sites for subsequent silver phosphate deposition; and the introduced silver nitrate can generate hydroxyl radicals and superoxide radicals under visible light irradiation, thereby destroying the metabolism of bacteria and achieving excellent antibacterial properties, and can effectively release silver ions in the absence of light to achieve the purpose of antibacterial.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In the first aspect, the present invention provides a TPU 3D air fiber, and the TPU 3D air fiber comprises TPU particles, organically modified montmorillonite, and silver phosphate.

[0007] The present invention prepares TPU fibers by electrospinning method, so that a three-dimensional structure with ventilation channels is formed inside, thereby significantly improving the air permeability of the material. Introducing organically modified montmorillonite during the spinning process can increase the porosity and air permeability of the material; using polydopamine to modify the surface of the TPU fiber skeleton, polydopamine itself has good biocompatibility and can synergistically act with antibacterial components to further enhance the antibacterial effect. At the same time, the formed polydopamine coating has good adhesion and activity, which can provide active sites for subsequent silver phosphate deposition; and the introduced silver nitrate can generate hydroxyl radicals and superoxide radicals under visible light irradiation, thereby destroying the metabolism of bacteria and achieving excellent antibacterial performance. In the absence of light, silver ions can be effectively released to achieve the purpose of antibacterial. These modification measures work together to make the TPU 3D air fiber have excellent air permeability, antibacterial property and durability, meeting the requirements of modern textile and medical fields for high-performance materials.

[0008] As a preferred technical solution of the present invention, the breathable TPU 3D air fiber comprises the following components in parts by mass: 80-90 parts of TPU particles, 4-8 parts of organically modified montmorillonite, and 5-15 parts of silver phosphate. Among them, the parts by mass of TPU particles can be 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, 86 parts, 87 parts, 88 parts, 89 parts or 90 parts, the parts by mass of organically modified montmorillonite can be 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, and the parts by mass of silver phosphate can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, but are not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0009] The present invention prepares TPU 3D fibers by electrospinning method. The electrospinning process can produce a nanofiber network, and this network structure has high porosity and large specific surface area, which is beneficial to the adsorption and rapid volatilization of moisture. At the same time, the porous structure also allows the free flow of air and moisture, thereby further enhancing the air permeability and moisture wicking ability of the fiber.

[0010] The present invention introduces organically modified montmorillonite to modify TPU fibers. Montmorillonite has a layered structure and a high specific surface area, and can adsorb a certain amount of water molecules. After organic modification, its hydrophilicity can be further enhanced, so that the moisture absorption capacity can be increased in the composite material; and the layered structure and high water conductivity of montmorillonite can form microchannels inside the fiber, which helps the diffusion and exclusion of moisture. This microchannel effect can accelerate the transfer of moisture inside the fiber and improve the overall moisture wicking performance.

[0011] The present invention specifically limits the mass fraction of the organically modified montmorillonite to 4-8 parts. Excessive organically modified montmorillonite may lead to uneven dispersion in the TPU matrix, thus forming agglomeration phenomena and reducing the interfacial bonding force of the composite material. At the same time, excessive montmorillonite may increase the density of the fibers, reduce the porosity, and further reduce the air permeability of the material.

[0012] By modifying the TPU fiber skeleton with polydopamine, the present invention can uniformly deposit silver phosphate on the fiber surface, avoiding agglomeration and uneven distribution, thereby improving the antibacterial efficiency. In addition, the polydopamine modification may further enhance the antibacterial performance of TPU because polydopamine has good biocompatibility and may synergistically act with the antibacterial component silver phosphate to enhance the antibacterial effect.

[0013] The present invention introduces silver phosphate to modify the TPU fiber skeleton. As a narrow-bandgap photocatalytic semiconductor, silver phosphate nanoparticles can generate hydroxyl radicals and superoxide radicals under visible light irradiation, thereby destroying the metabolism of bacteria and having excellent antibacterial performance. In addition, under dark conditions, silver phosphate nanoparticles can release silver ions, further enhancing the antibacterial effect. At the same time, the introduction of silver phosphate can affect the surface energy of the fibers through the distribution of its particles, enhancing the water adsorption capacity of the fibers. The hydrophilicity of silver phosphate also helps the diffusion of water on the fiber surface and forms a uniform hydrophilic region in the composite fiber, promoting the local absorption and release of water and making the moisture absorption and moisture wicking performance of the overall fiber more balanced.

[0014] The present invention specifically limits the addition amount of silver phosphate to 5-15 parts. Exceeding this range may lead to the saturation of the antibacterial effect. Further increasing the content of silver phosphate will not significantly improve the antibacterial performance. Instead, it may cause uneven dispersion in the TPU matrix, generate microdefects, and reduce the mechanical strength of the fibers. In addition, excessive silver phosphate may make the fibers become more brittle, reducing flexibility and air permeability, thus affecting the comfort and functionality of the overall material.

[0015] In the second aspect, the present invention provides a method for preparing TPU 3D air fibers, and the preparation method is as follows:

[0016] S1: Disperse montmorillonite in deionized water, stir and swell to obtain a montmorillonite suspension; dissolve dodecylbenzyldimethylammonium chloride in deionized water to obtain a cationic surfactant solution; slowly drip the cationic surfactant solution into the montmorillonite suspension to obtain a mixed solution A and continue stirring, then filter and wash, and dry the obtained reactant to obtain organically modified montmorillonite;

[0017] S2: Mix N-N dimethylformamide and tetrahydrofuran to obtain a mixed solution B. Add TPU particles and organically modified montmorillonite thereto and stir to obtain a spinning solution. Electrospinning is carried out to obtain a spun film, and the spun film is dried to obtain a modified TPU fiber skeleton;

[0018] S3: Dissolve tris(hydroxymethyl)aminomethane in deionized water and adjust the pH of the solution with hydrochloric acid to obtain a tris(hydroxymethyl)aminomethane buffer solution. Mix dopamine and the tris(hydroxymethyl)aminomethane buffer solution to obtain a mixed solution C. Place the modified TPU fiber skeleton in the mixed solution C and stir, then wash with deionized water and dry to obtain a polydopamine-modified TPU fiber skeleton;

[0019] S4: Dissolve silver nitrate in deionized water to obtain a silver nitrate solution. Immerse the polydopamine-modified TPU fiber skeleton in the silver nitrate solution and stir to obtain a reaction mixture. Dissolve sodium phosphate in deionized water to obtain a sodium phosphate solution. Drop the sodium phosphate solution into the reaction mixture to obtain a mixed solution D. After stirring, take out the material, wash with deionized water and dry to obtain TPU 3D air fibers.

[0020] As a preferred technical solution of the present invention, in step S1, the mass ratio of the montmorillonite to deionized water is (1-2):10. For example, it can be 1:10, 1.1:10, 1.2:10, 1.3:10, 1.4:10, 1.5:10, 1.6:10, 1.7:10, 1.8:10, 1.9:10 or 2:10, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0021] In some alternative examples, the mass ratio of dodecylbenzyldimethylammonium chloride to montmorillonite is (1-2):1. For example, it can be 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1 or 2:1, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0022] In some alternative examples, the mass ratio of dodecylbenzyldimethylammonium chloride to deionized water is (1-2):5. For example, it can be 1:5, 1.1:5, 1.2:5, 1.3:5, 1.4:5, 1.5:5, 1.6:5, 1.7:5, 1.8:5, 1.9:5 or 2:5, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0023] In some alternative examples, the rate at which the cationic surfactant solution is added dropwise to the montmorillonite suspension is 4 - 6 mL / min. For example, it can be 4 mL / min, 4.2 mL / min, 4.4 mL / min, 4.6 mL / min, 4.8 mL / min, 5 mL / min, 5.2 mL / min, 5.4 mL / min, 5.6 mL / min, 5.8 mL / min, or 6 mL / min. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0024] In some alternative examples, the temperature at which the mixed solution A is stirred is 60 - 70 °C. For example, it can be 60 °C, 61 °C, 62 °C, 63 °C, 64 °C, 65 °C, 66 °C, 67 °C, 68 °C, 69 °C, or 70 °C. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0025] In some alternative examples, the stirring time of the mixed solution A is 3 - 5 h. For example, it can be 3 h, 3.2 h, 3.4 h, 3.6 h, 3.8 h, 4 h, 4.2 h, 4.4 h, 4.6 h, 4.8 h, or 5 h. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0026] In some alternative examples, the drying temperature of the reactant is 50 - 60 °C. For example, it can be 50 °C, 51 °C, 52 °C, 53 °C, 54 °C, 55 °C, 56 °C, 57 °C, 58 °C, 59 °C, or 60 °C. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0027] In some alternative examples, the drying time of the reactant is 12 - 24 h. For example, it can be 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h, 19 h, 20 h, 21 h, 22 h, 23 h, or 24 h. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0028] As a preferred technical solution of the present invention, in step S2, the mass ratio of N - N dimethylformamide to tetrahydrofuran is (1:9) - (3:7). For example, it can be 7:1, 7:2, 7:3, 8:1, 8:2, 8:3, 9:1, 9:2, or 9:3. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0029] In some alternative examples, the temperature for stirring the spinning solution is 25 to 35 °C. For example, it can be 25 °C, 26 °C, 27 °C, 28 °C, 29 °C, 30 °C, 31 °C, 32 °C, 33 °C, 34 °C or 35 °C. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0030] In some alternative examples, the stirring time of the spinning solution is 6 to 8 h. For example, it can be 6 h, 6.2 h, 6.4 h, 6.6 h, 6.8 h, 7 h, 7.2 h, 7.4 h, 7.6 h, 7.8 h or 8 h. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0031] In some alternative examples, the voltage for electrospinning is 15 to 20 kV. For example, it can be 15 kV, 15.5 kV, 16 kV, 16.5 kV, 17 kV, 17.5 kV, 18 kV, 18.5 kV, 19 kV, 19.5 kV or 20 kV. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0032] In some alternative examples, the spinning distance for electrospinning is 15 to 20 cm. For example, it can be 15 cm, 15.5 cm, 16 cm, 16.5 cm, 17 cm, 17.5 cm, 18 cm, 18.5 cm, 19 cm, 19.5 cm or 20 cm. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0033] In some alternative examples, the injection rate of the spinning solution is 0.5 to 1.0 mL / h. For example, it can be 0.5 mL / h, 0.55 mL / h, 0.6 mL / h, 0.65 mL / h, 0.7 mL / h, 0.75 mL / h, 0.8 mL / h, 0.85 mL / h, 0.9 mL / h, 0.95 mL / h or 1.0 mL / h. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0034] In some alternative examples, the humidity for electrospinning is 30 to 40 %RH. For example, it can be 30 %RH, 31 %RH, 32 %RH, 33 %RH, 34 %RH, 35 %RH, 36 %RH, 37 %RH, 38 %RH, 39 %RH or 40 %RH. However, it is not limited to the listed values, and other unlisted values within this range are equally applicable.

[0035] In some alternative examples, the temperature for drying the spinning film is 60 to 80 °C. For example, it can be 60 °C, 62 °C, 64 °C, 66 °C, 68 °C, 70 °C, 72 °C, 74 °C, 76 °C, 78 °C or 80 °C. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0036] In some alternative examples, the drying time of the spinning film is 12 to 24 h. For example, it can be 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h, 19 h, 20 h, 21 h, 22 h, 23 h or 24 h. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0037] As a preferred technical solution of the present invention, in step S3, the pH of the tris(hydroxymethyl)aminomethane buffer solution is adjusted to 8.0 to 8.5 with hydrochloric acid. For example, it can be 8.0, 8.1, 8.2, 8.3, 8.4 or 8.5. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0038] In some alternative examples, the concentration of the tris(hydroxymethyl)aminomethane buffer solution is 10 to 30 mM. For example, it can be 10 mM, 12 mM, 14 mM, 16 mM, 18 mM, 20 mM, 22 mM, 24 mM, 26 mM, 28 mM or 30 mM. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0039] In some alternative examples, the concentration of the hydrochloric acid is 1 to 2 M. For example, it can be 1.0 M, 1.1 M, 1.2 M, 1.3 M, 1.4 M, 1.5 M, 1.6 M, 1.7 M, 1.8 M, 1.9 M or 2.0 M. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0040] In some alternative examples, the concentration of dopamine in the mixed solution C is 1 to 2 mg / mL. For example, it can be 1.0 mg / mL, 1.1 mg / mL, 1.2 mg / mL, 1.3 mg / mL, 1.4 mg / mL, 1.5 mg / mL, 1.6 mg / mL, 1.7 mg / mL, 1.8 mg / mL, 1.9 mg / mL or 2.0 mg / mL. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0041] In some alternative examples, the temperature for stirring the mixed solution C is 20 to 30 °C. For example, it can be 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C or 30°C. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0042] In some alternative examples, the time for stirring the mixed solution C is 4 to 6 h. For example, it can be 4 h, 4.2 h, 4.4 h, 4.6 h, 4.8 h, 5 h, 5.2 h, 5.4 h, 5.6 h, 5.8 h or 6 h. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0043] In some alternative examples, the drying temperature of the polydopamine-modified TPU fiber skeleton is 30 to 40 °C. For example, it can be 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C or 40°C. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0044] In some alternative examples, the drying time of the polydopamine-modified TPU fiber skeleton is 1 to 3 h. For example, it can be 1 h, 1.2 h, 1.4 h, 1.6 h, 1.8 h, 2 h, 2.2 h, 2.4 h, 2.6 h, 2.8 h or 3 h. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0045] As a preferred technical solution of the present invention, in step S4, the concentration of the sodium phosphate solution is 0.01 to 0.03 M. For example, it can be 0.01 M, 0.012 M, 0.014 M, 0.016 M, 0.018 M, 0.02 M, 0.022 M, 0.024 M, 0.026 M, 0.028 M or 0.03 M. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0046] In some alternative examples, the dropping rate of the sodium phosphate solution is 3 to 5 ml / min. For example, it can be 3 mL / min, 3.2 mL / min, 3.4 mL / min, 3.6 mL / min, 3.8 mL / min, 4 mL / min, 4.2 mL / min, 4.4 mL / min, 4.6 mL / min, 4.8 mL / min or 5 mL / min. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0047] In some alternative examples, the temperature for stirring the mixed solution D is 20~30°C. For example, it can be 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C or 30°C. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0048] In some alternative examples, the stirring time of the mixed solution D is 2~4h. For example, it can be 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, 3.2h, 3.4h, 3.6h, 3.8h or 4h. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0049] In some alternative examples, the drying temperature of the TPU 3D air fiber is 40~60°C. For example, it can be 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, 52°C, 54°C, 56°C, 58°C or 60°C. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0050] In some alternative examples, the drying time of the TPU 3D air fiber is 12 - 24h. For example, it can be 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h or 24h. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] The present invention provides a TPU 3D air fiber and its preparation method and application. By using the electrospinning method to prepare TPU fibers, a three-dimensional structure with ventilation channels is formed inside, thereby significantly improving the air permeability of the material. Introducing organically modified montmorillonite during the spinning process can increase the porosity and air permeability of the material; using polydopamine to modify the surface of the TPU fiber skeleton, polydopamine itself has good biocompatibility and can synergistically act with antibacterial components to further enhance the antibacterial effect. At the same time, the formed polydopamine coating has good adhesion and activity, which can provide active sites for subsequent silver phosphate deposition; the introduced silver nitrate can generate hydroxyl radicals and superoxide radicals under visible light irradiation, thereby destroying the metabolism of bacteria and achieving excellent antibacterial performance. In the absence of light, silver ions can be effectively released to achieve the purpose of antibacterial. These modifications further improve the comfort, functionality and durability of the material while retaining the original excellent properties of TPU, meeting the requirements for high-performance materials in modern textile and medical fields. Description of the Drawings

[0053] Figure 1 Flow chart of the preparation method of the TPU 3D fiber provided in Embodiments 1-4 of the present invention;

[0054] Figure 2 SEM image of the modified TPU fiber skeleton in Embodiment 1 of the present invention (scale bar: 4 μm);

[0055] Figure 3 SEM image of the modified TPU fiber skeleton in Embodiment 1 of the present invention (scale bar: 1 μm);

[0056] Figure 4 SEM image of the polydopamine (PDA)-modified TPU fiber skeleton in Embodiment 1 of the present invention;

[0057] Figure 5 SEM image of the TPU 3D fiber in Embodiment 1 of the present invention. Detailed implementation manners

[0058] The technical solution of the present invention will be described in detail below in conjunction with specific embodiments and their accompanying drawings. The embodiments described herein are specific specific implementation manners of the present invention and are used to illustrate the concept of the present invention; these descriptions are all explanatory and exemplary and should not be construed as limiting the implementation manner of the present invention and the protection scope of the present invention. Except for the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the content disclosed in the claims and the specification of this application, and these technical solutions include technical solutions that make any obvious substitutions and modifications to the embodiments described herein.

[0059] The chemical reagents used in the embodiments and comparative examples of the present invention are all commercially available products, and their brand names, specifications, manufacturers and other information are as follows:

[0060] Montmorillonite: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0061] Dodecylbenzyldimethylammonium chloride: purchased from Shanghai Zhixin Chemical Co., Ltd.;

[0062] N-N dimethylformamide: purchased from Shanghai Merck Chemical Technology Co., Ltd.;

[0063] Tetrahydrofuran: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0064] TPU particles: M W = 150000, purchased from BASF SE;

[0065] Tris(hydroxymethyl)aminomethane: purchased from Shanghai J&Z Biochem Co., Ltd.;

[0066] Hydrochloric acid: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0067] Dopamine: purchased from Shanghai Zhenli Biotechnology Co., Ltd.;

[0068] Silver nitrate: purchased from Sinopharm Chemical Reagent Co., Ltd.;

[0069] Sodium phosphate: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0070] Example 1

[0071] This example provides a TPU 3D fiber and a preparation method. Among them, the TPU 3D fiber includes the following components in parts by mass:

[0072] TPU particles 81 parts

[0073] Organically modified montmorillonite 4 parts

[0074] Silver phosphate 15 parts

[0075] As Figure 1 shown, the preparation method specifically includes the following steps:

[0076] S1: Disperse montmorillonite in deionized water. The mass ratio of montmorillonite to deionized water is 1.2:10. Stir and swell to obtain a montmorillonite suspension; dissolve dodecylbenzyldimethylammonium chloride in deionized water. The mass ratio of dodecylbenzyldimethylammonium chloride to montmorillonite is 1:1, and the mass ratio of dodecylbenzyldimethylammonium chloride to deionized water is 1:5 to obtain a cationic surfactant solution; drop the cationic surfactant solution into the montmorillonite suspension at a dropping speed of 4.6 mL / min to obtain a mixed solution A and continue to stir. The stirring temperature is 66 °C and the time is 4 h. Then filter and wash, and dry the obtained reactant at 50 °C for 24 h to obtain organically modified montmorillonite;

[0077] S2: Mix N-N dimethylformamide and tetrahydrofuran in a mass ratio of 1:9 to obtain a mixed solution B. Add TPU particles and organically modified montmorillonite to it and stir at 25 °C for 8 h to obtain a spinning solution. Electrospinning is carried out to obtain a spun film. Among them, the voltage of electrospinning is 20 kV, the spinning distance of electrospinning is 19 cm, the injection speed of the spinning solution is 0.8 mL / h, and the humidity of electrospinning is 30%RH. Dry the spun film to obtain a modified TPU fiber skeleton. Its drying temperature is 80 °C and the drying time is 12 h. Its SEM images are Figure 2 、 Figure 3 , as can be seen from the figure, the obtained TPU fiber skeleton has a smooth surface and uniform fibers;

[0078] S3: Dissolve tris(hydroxymethyl)aminomethane in deionized water, and adjust the pH of the solution to 8.1 with 2 M hydrochloric acid to obtain a 12 mM tris(hydroxymethyl)aminomethane buffer solution; mix dopamine and the tris(hydroxymethyl)aminomethane buffer solution to obtain a mixed solution C, where the concentration of dopamine is 1.3 mg / mL. Place the modified TPU fiber skeleton in the mixed solution C, stir at 25 °C for 5 h, then wash with deionized water and dry at 40 °C for 1 h to obtain a polydopamine-modified TPU fiber skeleton. The SEM image is shown in Figure 4 , after dopamine modification, a polydopamine coating is formed on the surface of the TPU fiber. The polydopamine coating has good adhesion and activity, and can provide active sites for subsequent silver phosphate deposition;

[0079] S4: Dissolve silver nitrate in deionized water to obtain a 0.012 M silver nitrate solution. Immerse the polydopamine-modified TPU fiber skeleton in the silver nitrate solution and stir at 20 °C for 2 h to obtain a reaction mixture; dissolve sodium phosphate in deionized water to obtain a 0.012 M sodium phosphate solution. Drop the sodium phosphate solution into the reaction mixture at a dropping rate of 5 mL / min to obtain a mixed solution D. After stirring, take out the material. The mixed solution D is stirred at 22 °C for 2 h, washed with deionized water and dried to obtain TPU 3D air fibers, where the drying temperature is 40 °C and the drying time is 24 h. The SEM image is as Figure 5 , and silver phosphate precipitates are uniformly deposited on the surface of the TPU fiber.

[0080] Example 2

[0081] This example provides a TPU 3D fiber and a preparation method thereof. Among them, the TPU 3D fiber includes the following components in parts by mass:

[0082] TPU particles 87 parts

[0083] Organically modified montmorillonite 6 parts

[0084] Silver phosphate 7 parts

[0085] As Figure 1 shown, the preparation method specifically includes the following steps:

[0086] S1: Disperse montmorillonite in deionized water at a mass ratio of montmorillonite to deionized water of 2:10, stir and swell to obtain a montmorillonite suspension; dissolve dodecylbenzyldimethylammonium chloride in deionized water, where the mass ratio of dodecylbenzyldimethylammonium chloride to montmorillonite is 1.6:1 and the mass ratio of dodecylbenzyldimethylammonium chloride to deionized water is 1.2:5 to obtain a cationic surfactant solution; drop the cationic surfactant solution into the montmorillonite suspension at a dropping rate of 6 mL / min to obtain a mixed solution A and continue stirring. The stirring temperature is 62 °C and the time is 5 h. Then filter and wash, and dry the obtained reactant at 52 °C for 20 h to obtain organically modified montmorillonite;

[0087] S2: Mix N-N dimethylformamide and tetrahydrofuran at a mass ratio of 3:7 to obtain a mixed solution B. Add TPU particles and organically modified montmorillonite thereto and stir at 30 °C for 7 h to obtain a spinning solution. Electrospinning is carried out to obtain a spun film. Among them, the voltage of electrospinning is 18 kV, the spinning distance of electrospinning is 15 cm, the injection rate of the spinning solution is 0.5 mL / h, and the humidity of electrospinning is 32%RH. Dry the spun film to obtain a modified TPU fiber skeleton. The drying temperature is 76 °C and the drying time is 18 h;

[0088] S3: Dissolve tris(hydroxymethyl)aminomethane in deionized water and adjust the pH of the solution to 8.5 with 1 M hydrochloric acid to obtain a 10 mM tris(hydroxymethyl)aminomethane buffer solution; mix dopamine and the tris(hydroxymethyl)aminomethane buffer solution to obtain a mixed solution C, where the concentration of dopamine is 1 mg / mL. Place the modified TPU fiber skeleton in the mixed solution C and stir at 20 °C for 4 h. Then wash with deionized water and dry at 38 °C for 3 h to obtain a polydopamine-modified TPU fiber skeleton;

[0089] S4: Dissolve silver nitrate in deionized water to obtain a 0.026 M silver nitrate solution. Immerse the polydopamine-modified TPU fiber skeleton in the silver nitrate solution and stir at 26 °C for 1.2 h to obtain a reaction mixture; dissolve sodium phosphate in deionized water to obtain a 0.03 M sodium phosphate solution. Drop the sodium phosphate solution into the reaction mixture at a dropping rate of 3.2 mL / min to obtain a mixed solution D. After stirring, take out the material. Among them, the mixed solution D is stirred at 30 °C for 3 h, washed with deionized water and dried to obtain TPU 3D air fibers. The drying temperature is 50 °C and the drying time is 18 h.

[0090] Example 3

[0091] This example provides a TPU 3D fiber and a preparation method. Among them, the TPU 3D fiber includes the following components in parts by mass:

[0092] 80 parts of TPU particles

[0093] 8 parts of organically modified montmorillonite

[0094] 12 parts of silver phosphate

[0095] Such as Figure 1 shown, the preparation method specifically includes the following steps:

[0096] S1: Disperse montmorillonite in deionized water with a mass ratio of montmorillonite to deionized water of 1:10, stir and swell to obtain a montmorillonite suspension; dissolve dodecylbenzyldimethylammonium chloride in deionized water, where the mass ratio of dodecylbenzyldimethylammonium chloride to montmorillonite is 1.3:1 and the mass ratio of dodecylbenzyldimethylammonium chloride to deionized water is 1.5:5 to obtain a cationic surfactant solution; drop the cationic surfactant solution into the montmorillonite suspension at a dropping rate of 4 mL / min to obtain a mixed solution A and continue stirring, with the stirring temperature being 70 °C and the time being 3 h, then filter and wash, and dry the obtained reactant at 60 °C for 12 h to obtain organically modified montmorillonite;

[0097] S2: Mix N-N dimethylformamide and tetrahydrofuran in a mass ratio of 2:8 to obtain a mixed solution B, add TPU particles and organically modified montmorillonite thereto and stir at 35 °C for 6.6 h to obtain a spinning solution, and obtain a spun film by electrospinning, where the voltage of electrospinning is 15 kV, the spinning distance of electrospinning is 17 cm, the pushing speed of the spinning solution is 1 mL / h, and the humidity of electrospinning is 40%RH. Dry the spun film to obtain a modified TPU fiber skeleton, with the drying temperature being 60 °C and the drying time being 24 h;

[0098] S3: Dissolve tris(hydroxymethyl)aminomethane in deionized water and adjust the pH of the solution to 8 with 1.2 M hydrochloric acid to obtain a 20 mM tris(hydroxymethyl)aminomethane buffer solution; mix dopamine and the tris(hydroxymethyl)aminomethane buffer solution to obtain a mixed solution C, where the concentration of dopamine is 2 mg / mL, place the modified TPU fiber skeleton in the mixed solution C, stir at 28 °C for 6 h, then wash with deionized water and dry at 36 °C for 2.6 h to obtain a polydopamine-modified TPU fiber skeleton;

[0099] S4: Dissolve silver nitrate in deionized water to obtain a silver nitrate solution with a concentration of 0.01 M. Immerse the polydopamine-modified TPU fiber framework into the silver nitrate solution and stir at 22 °C for 1.6 h to obtain a reaction mixture. Dissolve sodium phosphate in deionized water to obtain a sodium phosphate solution with a concentration of 0.024 M. Drop the sodium phosphate solution into the reaction mixture at a dropping rate of 4.2 mL / min to obtain a mixed solution D. After stirring, take out the material, and stir the mixed solution D at 20 °C for 3.6 h. Wash and dry it with deionized water to obtain TPU 3D air fibers, where the drying temperature is 56 °C and the drying time is 14 h.

[0100] Example 4

[0101] This example provides a TPU 3D fiber and its preparation method. Among them, the TPU 3D fiber includes the following components in parts by mass:

[0102] TPU particles 90 parts

[0103] Organically modified montmorillonite 5 parts

[0104] Silver phosphate 5 parts

[0105] As Figure 1 shown, the preparation method specifically includes the following steps:

[0106] S1: Disperse montmorillonite in deionized water, and the mass ratio of montmorillonite to deionized water is 1.6:10. Stir and swell to obtain a montmorillonite suspension. Dissolve dodecylbenzyldimethylammonium chloride in deionized water, where the mass ratio of dodecylbenzyldimethylammonium chloride to montmorillonite is 2:1 and the mass ratio of dodecylbenzyldimethylammonium chloride to deionized water is 2:5 to obtain a cationic surfactant solution. Drop the cationic surfactant solution into the montmorillonite suspension at a dropping rate of 5.2 mL / min to obtain a mixed solution A and continue to stir. The stirring temperature is 60 °C and the time is 4.6 h. Then filter and wash, and dry the obtained reactant at 58 °C for 16 h to obtain organically modified montmorillonite;

[0107] S2: Mix N-N dimethylformamide and tetrahydrofuran in a mass ratio of 3:7 to obtain a mixed solution B. Add TPU particles and organically modified montmorillonite to it and stir at 28 °C for 6 h to obtain a spinning solution. Obtain a spun film by electrospinning, where the electrospinning voltage is 16 kV, the electrospinning distance is 20 cm, the pushing speed of the spinning solution is 0.6 mL / h, and the electrospinning humidity is 38%RH. Dry the spun film to obtain a modified TPU fiber framework, where the drying temperature is 66 °C and the drying time is 20 h;

[0108] S3: Dissolve tris(hydroxymethyl)aminomethane in deionized water, and adjust the pH of the solution to 8.3 with 1.8 M hydrochloric acid to obtain a 30 mM tris(hydroxymethyl)aminomethane buffer solution; mix dopamine and the tris(hydroxymethyl)aminomethane buffer solution to obtain a mixed solution C, where the concentration of dopamine is 1.8 mg / mL. Place the modified TPU fiber skeleton in the mixed solution C, stir at 30 °C for 5.2 h, then wash with deionized water and dry at 30 °C for 2 h to obtain a polydopamine-modified TPU fiber skeleton;

[0109] S4: Dissolve silver nitrate in deionized water to obtain a 0.03 M silver nitrate solution. Immerse the polydopamine-modified TPU fiber skeleton in the silver nitrate solution and stir at 30 °C for 1 h to obtain a reaction mixture; dissolve sodium phosphate in deionized water to obtain a 0.028 M sodium phosphate solution. Drop the sodium phosphate solution into the reaction mixture at a dropping rate of 3 mL / min to obtain a mixed solution D. After stirring, take out the material. Stir the mixed solution D at 28 °C for 4 h, wash with deionized water, and dry to obtain TPU 3D air fibers, where the drying temperature is 60 °C and the drying time is 12 h.

[0110] Comparative Example 1

[0111] This example provides a TPU 3D fiber, which is different from Example 1 in that the mass fraction of organically modified montmorillonite in the TPU 3D fiber is adjusted to 15 parts. Compared with Example 1, the mass fraction of organically modified montmorillonite in this example is increased by 11 parts. The increased parts are deducted proportionally from the TPU particles and silver phosphate, so that the proportion of the mass fractions of other components except organically modified montmorillonite remains unchanged. The mass fractions of the components of the adjusted TPU 3D fiber are as follows:

[0112] TPU particles 71.72 parts

[0113] Organically modified montmorillonite 15 parts

[0114] Silver phosphate 13.28 parts

[0115] Other process parameters and operating conditions are exactly the same as those in Example 1.

[0116] Comparative Example 2

[0117] This embodiment provides a TPU 3D fiber, which is different from that of Embodiment 1 in that the mass fraction of organically modified montmorillonite in the TPU 3D fiber is adjusted to 1 part. Compared with Embodiment 1, the mass fraction of organically modified montmorillonite in this embodiment is reduced by 3 parts, and the reduced mass fraction is proportionally added to the mass fractions of TPU particles and silver phosphate, so that the proportion of the mass fractions of other components except organically modified montmorillonite remains unchanged. The mass fractions of the components of the adjusted TPU 3D fiber are as follows:

[0118] TPU particles 83.53 parts

[0119] Organically modified montmorillonite 1 part

[0120] Silver phosphate 15.47 parts

[0121] Other process parameters and operating conditions are exactly the same as those of Embodiment 1.

[0122] Comparative Example 3

[0123] This embodiment provides a TPU 3D fiber, which is different from that of Embodiment 1 in that the mass fraction of silver phosphate in the TPU 3D fiber is adjusted to 20 parts. Compared with Embodiment 1, the mass fraction of silver phosphate in this embodiment is increased by 5 parts, and the increased parts are proportionally deducted from the TPU particles and organically modified montmorillonite, so that the proportion of the mass fractions of other components except silver phosphate remains unchanged. The mass fractions of the components of the adjusted TPU 3D fiber are as follows:

[0124] TPU particles 76.24 parts

[0125] Organically modified montmorillonite 3.76 parts

[0126] Silver phosphate 20 parts

[0127] Other process parameters and operating conditions are exactly the same as those of Embodiment 1.

[0128] Comparative Example 4

[0129] This embodiment provides a TPU 3D fiber, which is different from that of Embodiment 1 in that the mass fraction of silver phosphate in the TPU 3D fiber is adjusted to 3 parts. Compared with Embodiment 1, the mass fraction of silver phosphate in this embodiment is reduced by 12 parts, and the reduced mass fraction is proportionally added to the mass fractions of TPU particles and organically modified montmorillonite, so that the proportion of the mass fractions of other components except silver phosphate remains unchanged. The mass fractions of the components of the adjusted TPU 3D fiber are as follows:

[0130] TPU particles 92.44 parts

[0131] Organically modified montmorillonite 4.56 parts

[0132] 3 parts of silver phosphate

[0133] Other process parameters and operating conditions are exactly the same as those in Example 1.

[0134] Comparative Example 5

[0135] This example provides a TPU 3D fiber, which is different from that in Example 1 in that the voltage of electrospinning in step S2 is changed to 10 kV, and other conditions remain unchanged.

[0136] Comparative Example 6

[0137] This example provides a TPU 3D fiber, which is different from that in Example 1 in that the spinning distance of electrospinning in step S2 is changed to 10 cm, and other conditions remain unchanged.

[0138] Comparative Example 7

[0139] This example provides a TPU 3D fiber, which is different from that in Example 1 in that the injection speed of the spinning solution for electrospinning in step S2 is 2 mL / h, and other conditions remain unchanged.

[0140] Comparative Example 8

[0141] This example provides a TPU 3D fiber, which is different from that in Example 1 in that the humidity of electrospinning in step S2 is changed to 50%RH, and other conditions remain unchanged.

[0142] The performance of the TPU 3D fibers in Examples 1 to 4 and Comparative Examples 1 to 8 was tested as follows:

[0143] The morphology of the modified TPU fiber skeleton, polydopamine-modified TPU fiber skeleton, and TPU 3D fiber in Example 1 was tested by scanning electron microscopy (SEM);

[0144] The air permeability of the TPU 3D fibers in Examples 1 to 4 and Comparative Examples 1 to 8 was tested according to GB / T 5453-1997 "Determination of Air Permeability of Textiles Fabrics";

[0145] The moisture permeability of the TPU 3D fibers in Examples 1 to 4 and Comparative Examples 1 to 8 was tested according to GB / T12704.1-2009 "Test Method for Moisture Permeability of Textiles Fabrics - Part 1: Moisture Absorption Method";

[0146] The antibacterial and bacteriostatic effects were tested according to the antibacterial and bacteriostatic performance test method for non-eluting anti-(or)bacterial products in Appendix C5 of GB 15979-2002;

[0147] All the test results are shown in Table 1:

[0148] Table 1: Performance Test of TPU 3D Fibers in Examples 1-4 and Comparative Examples 1-8

[0149]

[0150] It can be seen from the data in Table 1 that the TPU 3D fibers prepared in Examples 1-4 provided by the present invention have good air permeability, moisture permeability, antibacterial and bacteriostatic properties.

[0151] It can be seen from the test results of Example 1, Comparative Example 1 and Comparative Example 2 that when the mass fraction of organically modified montmorillonite in the TPU 3D fiber is in the range of 4-8 parts, montmorillonite has a layered structure and a high specific surface area, and can adsorb a certain amount of water molecules. After organic modification, its hydrophilicity can be further enhanced, so that the moisture absorption capacity can be increased in the composite material. At the same time, its layered structure and high water conductivity can form microchannels inside the fiber, which can accelerate the transfer of water inside the fiber and improve the overall moisture discharge performance. However, excessive organically modified montmorillonite may lead to uneven dispersion in the TPU matrix, thus forming agglomeration phenomena and reducing the interfacial bonding force of the composite material. At the same time, excessive montmorillonite may increase the density of the fiber, reduce the porosity, and thus reduce the air permeability of the material.

[0152] It can be seen from the test results of Example 1, Comparative Example 3 and Comparative Example 4 that when the mass fraction of silver phosphate in the TPU 3D fiber is in the range of 5-15 parts, silver phosphate has good antibacterial properties under visible light irradiation or in a lightless environment. At the same time, silver phosphate can affect the surface energy of the fiber through the distribution of its particles, enhancing the water adsorption capacity of the fiber. Its hydrophilicity also helps the diffusion of water on the fiber surface and forms a uniform hydrophilic region in the composite fiber, promoting the local absorption and release of water, making the moisture absorption and discharge performance of the overall fiber more balanced. However, exceeding this range cannot further improve the antibacterial performance, but may lead to uneven dispersion in the TPU matrix, generating microscopic defects and reducing the mechanical strength of the fiber. In addition, excessive silver phosphate may make the fiber more brittle, reducing flexibility and air permeability, thus affecting the comfort and functionality of the overall material.

[0153] It can be seen from Example 1 and Comparative Example 5 that when the voltage of electrospinning is too small, the electric field strength decreases, and the tensile force on the fiber decreases, resulting in an increase in the fiber diameter, thus reducing the air permeability and moisture permeability of the material.

[0154] It can be seen from Example 1 and Comparative Example 6 that when the spinning distance of electrospinning is too small, the stretching time of the fiber during flight becomes shorter, resulting in an excessive fiber diameter when it reaches the collector, thus reducing the air permeability and moisture permeability of the material.

[0155] As can be seen from Example 1 and Comparative Example 7, when the injection speed of the spinning solution is too fast during the electrospinning process, more materials are ejected, resulting in an increase in the fiber diameter; and too high a flow rate may cause the solution not to have enough time to spread before ejection, resulting in uneven fiber diameters, thereby reducing the air permeability and moisture permeability.

[0156] As can be seen from Example 1 and Comparative Example 8, when the electrospinning humidity is too high, the high humidity will cause the fibers to absorb moisture during the formation process, which may increase the fiber diameter or cause the fibers to stick together, thereby reducing the air permeability and moisture permeability.

[0157] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A method for preparing TPU 3D air fiber, characterized in that: The preparation method is: S1: dispersing montmorillonite in deionized water, stirring and swelling to obtain a montmorillonite suspension; Dissolving dodecylbenzyldimethylammonium chloride in deionized water to obtain a cationic surfactant solution; dropping the cationic surfactant solution into the montmorillonite suspension to obtain a mixed solution A and continuing to stir, then filtering and washing, and drying the obtained reactant to obtain an organic modified montmorillonite; S2: N,N-dimethylformamide and tetrahydrofuran are mixed to obtain a mixed solution B, TPU particles and organic modified montmorillonite are added thereto and stirred to obtain a spinning solution, a spinning membrane is obtained by electrospinning, and the spinning membrane is dried to obtain a modified TPU fiber skeleton; S3: dissolving tris(hydroxymethylaminomethane) in deionized water, and adjusting the pH value of the solution with hydrochloric acid to obtain a tris(hydroxymethylaminomethane) buffer solution; Dopamine and tris(hydroxymethylaminomethane) buffer solution are mixed to obtain a mixed solution C, the modified TPU fiber skeleton is placed in the mixed solution C and stirred, and then washed with deionized water and dried to obtain a polydopamine-modified TPU fiber skeleton; S4: dissolving silver nitrate in deionized water to obtain a silver nitrate solution, immersing the polydopamine-modified TPU fiber skeleton in the silver nitrate solution, stirring, and obtaining a reaction mixture; dissolving sodium phosphate in deionized water to obtain a sodium phosphate solution, and dropping the sodium phosphate solution into the reaction mixture to obtain a mixed solution D, taking out the material after stirring, washing with deionized water, and drying to obtain TPU 3D air fiber; The mass ratio of the montmorillonite to the deionized water is (1-2):10; The mass ratio of dodecylbenzyldimethylammonium chloride to montmorillonite is (1-2): 1; The mass ratio of dodecylbenzyldimethylammonium chloride to deionized water is (1-2):5; The TPU 3D air fiber comprises the following components in parts by weight: 80-90 parts of TPU particles, 4-8 parts of organically modified montmorillonite, and 5-15 parts of silver phosphate.

2. The method for preparing TPU 3D air fiber according to claim 1, characterized in that: In S1, the cationic surfactant solution is added dropwise to the montmorillonite suspension at a speed of 4-6 mL / min.

3. The method for preparing TPU 3D air fiber according to claim 1, characterized in that: In S1, The stirring temperature of the mixed solution A is 60-70°C; The stirring time of the mixed solution A is 3 to 5 hours; The temperature of drying the reactants is 50-60°C; The drying time of the reactants is 12 to 24 hours.

4. The method for preparing TPU 3D air fiber according to claim 1, characterized in that: In S2, The mass ratio of N,N-dimethylformamide to tetrahydrofuran is (1:9) to (3:7); The temperature at which the spinning solution is stirred is 25-35°C; The spinning solution is stirred for 6 to 8 hours; The voltage of the electrospinning is 15-20 kV.

5. The method for preparing TPU 3D air fiber according to claim 1, characterized in that: In S2, The spinning distance of the electrospinning is 15-20 cm; The spinning solution injection speed is 0.5-1.0 mL / h; The humidity of the electrospinning is 30-40% RH; The spinning film drying temperature is 60-80°C; The spinning membrane is dried for 12 to 24 hours.

6. The method for preparing TPU 3D air fiber according to claim 1, characterized in that: In S3, The pH of the tris(hydroxymethyl)aminomethane buffer solution is adjusted to 8.0-8.5 with hydrochloric acid; The concentration of the tris(hydroxymethyl)aminomethane buffer solution is 10-30 mM; The hydrochloric acid concentration is 1~2M; The concentration of dopamine in the mixed solution C is 1-2 mg / mL; The stirring temperature of the mixed solution C is 20-30°C; The stirring time of the mixed solution C is 4 to 6 hours; The drying temperature of the polydopamine-modified TPU fiber skeleton is 30-40°C; The drying time of the polydopamine-modified TPU fiber skeleton is 1 to 3 hours.

7. The method for preparing TPU 3D air fiber according to claim 1, characterized in that: In S4, The concentration of the silver nitrate solution is 0.01~0.03M; The temperature at which the reaction mixture is stirred is 20-30°C; The reaction mixture is stirred for 1 to 2 hours.

8. The method for preparing TPU 3D air fiber according to claim 1, characterized in that: In S4, The concentration of the sodium phosphate solution is 0.01~0.03M; The sodium phosphate solution is added dropwise at a rate of 3-5 mL / min; The stirring temperature of the mixed solution D is 20-30°C; The stirring time of the mixed solution D is 2 to 4 hours; The drying temperature of the TPU 3D air fiber is 40-60°C; The drying time of the TPU 3D air fiber is 12 to 24 hours.

9. A TPU 3D air fiber prepared by the method for preparing a TPU 3D air fiber according to any one of claims 1 to 8, characterized in that: The TPU 3D air fiber comprises the following components in parts by weight: 80-90 parts of TPU particles, 4-8 parts of organically modified montmorillonite, and 5-15 parts of silver phosphate.

10. Use of the TPU 3D air fiber according to claim 9 in making sportswear, medical aids or household items.

Images