A biomass multilayer fabric, its preparation method, and clothing made from the fabric.

Abstract

This invention provides a biomass multilayer fabric, its preparation method, and clothing made from the fabric, belonging to the field of fabric and apparel technology. The preparation process includes the following steps: preparation of antibacterial bamboo fiber; preparation of cooling composite doped fiber; preparation of a skin-friendly inner layer fabric; construction of a gradient unidirectional moisture-wicking layer; and preparation of the biomass multilayer fabric. This invention achieves antibacterial properties by ball milling pretreatment with acetic acid and carboxymethylation modification of bamboo fiber, embedding zinc ions, and constructing a core-shell structure with hydroxylated boron nitride, nano-shell powder, and silica, giving the fabric a dual cooling sensation of thermal conductivity and radiative cooling. The gradient unidirectional moisture-wicking layer design further enhances the fabric's antibacterial, long-lasting cooling, and moisture-wicking quick-drying properties.

Description

Technical Field

[0001] This invention relates to the field of fabric and clothing technology, specifically to a biomass multilayer fabric, its preparation method, and clothing made from the fabric. Background Technology

[0002] Against the backdrop of global advocacy for green and sustainable development, biomass fabrics have become a research hotspot in the textile industry due to their natural, renewable, and environmentally friendly characteristics. With the increasing popularity of outdoor sports and high-temperature work, consumers have placed higher demands on the moisture-wicking and quick-drying performance of clothing: not only do they need the fabric to quickly absorb sweat from the skin's surface, but they also need to keep the skin dry through efficient transmission and evaporation mechanisms, avoiding the stickiness, stuffiness, and bacterial growth caused by sweat retention.

[0003] The existing manufacturing technology for moisture-wicking and quick-drying fabrics mainly faces the following bottlenecks: Traditional unidirectional moisture-wicking structures rely on single fiber modification or coating treatment, which makes it difficult to form a stable surface energy gradient. This causes sweat to easily seep back onto the skin side (inner layer), making continuous unidirectional transmission impossible. As a result, the inner layer of the clothing fabric is prone to dampness and poor comfort. Furthermore, the damp environment is conducive to the growth of bacteria. The antibacterial properties of traditional antibacterial fabrics are achieved by adding antibacterial finishing agents. However, since the antibacterial finishing agents cannot achieve a strong bond with the fabric, the antibacterial ability of the fabric will fail after multiple washes, which seriously affects the durability of the antibacterial fabric.

[0004] Therefore, we propose a biomass multilayer fabric with excellent antibacterial durability, which can keep the inner layer of the fabric dry and comfortable and has a continuous cooling sensation, a preparation method, and clothing made from the fabric. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a biomass multilayer fabric, a preparation method thereof, and clothing made from the fabric.

[0006] A biomass multilayer fabric consists of an inner layer, a middle layer and an outer layer. The inner layer is a skin-friendly inner layer fabric, the middle layer is a gradient one-way moisture-wicking layer, and the outer layer is an antibacterial and wear-resistant outer layer fabric.

[0007] The skin-friendly inner layer fabric is made by blending and weaving collagen fiber, cooling composite doped fiber, diacetate fiber and modal fiber;

[0008] The cooling composite doped fiber is made of silicon dioxide and water-based polyurethane as the outer layer, and hydroxylated boron nitride, nano-shell powder, and water-based polyurethane as the inner layer, obtained by coaxial wet spinning.

[0009] The gradient unidirectional moisture-wicking layer is obtained by hydrophobically finishing the skin-friendly inner layer fabric, followed by electrospinning a hydrophilic spinning solution prepared by hydrolyzed polyacrylonitrile and polyurethane to obtain a hydrophilic-hydrophobic skin-friendly inner layer fabric. The hydrophilic-hydrophobic skin-friendly inner layer fabric is obtained by electrospinning a mixture of hydrolyzed polyacrylonitrile, acrylic acid, acrylamide, potassium persulfate and glutaraldehyde into a superhydrophilic spinning solution prepared by polyurethane.

[0010] The antibacterial and wear-resistant outer fabric is made by blending and weaving antibacterial bamboo fiber, cotton fiber and polyamide fiber.

[0011] A method for preparing a biomass multilayer fabric includes the following steps:

[0012] S1: Preparation of antibacterial bamboo fiber;

[0013] S2: Preparation of cooling composite doped fibers;

[0014] S3: Preparation of skin-friendly inner layer fabric;

[0015] S4: Construction of a gradient unidirectional humidification layer;

[0016] S5: Preparation of biomass multilayer fabric.

[0017] Furthermore, the preparation of antibacterial bamboo fiber in step S1 specifically includes the following steps:

[0018] S1.1: Mix 80-100 mesh dried bamboo powder with acetic acid solution at a solid-liquid ratio of 1:6 (g / mL), then place the mixture in a metal ball mill jar and ball mill for 2-3 hours at 150-180℃ and 300-500rpm under closed conditions to obtain a ball-milled mixture;

[0019] S1.2: The ball-milled mixture is continuously washed with deionized water until neutral, then dried to obtain pretreated bamboo fiber;

[0020] S1.3: Mix 20-23 parts by weight of pretreated bamboo fiber and 200-230 parts by weight of 5 wt% sodium hydroxide solution, and react at 75-80℃ for 1-2 h. After the reaction is complete, add 6.6-7.2 parts by weight of sodium chloroacetate and 240-260 parts by weight of deionized water, and react at 75-80℃ for 2-3 h. After the reaction is complete, wash with anhydrous ethanol 2-3 times, and then dry to obtain carboxymethylated modified bamboo fiber.

[0021] S1.4: Add 10-12 parts by weight of carboxymethylated modified bamboo fiber to 280-300 parts by weight of anhydrous ethanol, then add 140-160 parts by weight of 30wt% zinc chloride solution, then heat in a water bath at 70-80℃ for 2-3 hours, then wash with deionized water 2-3 times, and finally dry to obtain antibacterial bamboo fiber.

[0022] Furthermore, the preparation of the cooling composite doped fiber in step S2 specifically includes the following steps:

[0023] S2.1: Add 10-12 parts by weight of silica to 60-80 parts by weight of dimethylformamide, stir at room temperature for 20-30 minutes, then sonicate for 30-40 minutes, then add 15-20 parts by weight of waterborne polyurethane, stir and mix at 45-50℃ for 4-5 hours, and then let stand at room temperature for 10-12 hours to obtain the outer spinning solution;

[0024] S2.2: Add 5-10 parts by weight of hydroxylated boron nitride and 2-5 parts by weight of nano-shell powder to 80-90 parts by weight of dimethylformamide and stir at room temperature for 20-30 minutes. Then sonicate for 30-40 minutes, add 15-20 parts by weight of waterborne polyurethane, stir and mix at 45-50℃ for 4-5 hours, and then let stand at room temperature for 10-12 hours to obtain the inner layer spinning solution.

[0025] S2.3: Pour the outer spinning solution and the inner spinning solution into the syringe respectively, use a coaxial needle, and wet spin at a spinning speed of 5-8 mL / h. Use an injection pump to squeeze the spinning solution in the syringe into the coagulation bath. The coagulation bath is deionized water. The spinning solution quickly coagulates to obtain cool-feeling composite doped fiber.

[0026] Furthermore, step S3, the preparation of the skin-friendly inner layer fabric, specifically includes the following steps:

[0027] S3.1: Add 8-10 parts by weight of collagen to 85-90 parts by weight of deionized water, then stir at 400-500 r / min for 4-5 h, then filter, degas and allow to stand and swell before adding glutaraldehyde, the amount of glutaraldehyde added is 3-5 wt% of the collagen protein, and stir and mix at 200-300 r / min for 20-30 min to obtain a composite collagen spinning solution;

[0028] S3.2: Use a syringe to draw up the composite collagen spinning solution, and then spin it through a wet spinning device to obtain collagen fibers;

[0029] S3.3: Collagen fiber, cooling composite doped fiber, diacetate fiber and modal fiber are blended in a ratio of 1-3:2-4:2-3:2-4 to make blended yarn. The blended yarn is then woven into fabric using a loom to obtain a skin-friendly inner layer fabric.

[0030] Furthermore, the construction of the gradient unidirectional humidification layer in step S4 specifically includes the following steps:

[0031] S4.1: Dilute the finishing agent UNIDYNETG-5674 with deionized water to prepare a water-repellent finishing solution with a concentration of 30-40g / L. Use the water-repellent finishing solution to finish the skin-friendly inner layer fabric to obtain a hydrophobic and skin-friendly inner layer fabric.

[0032] S4.2: Mix 10-12 parts by weight of polyacrylonitrile and 30-35 parts by weight of 2.5M sodium hydroxide solution, and hydrolyze at 50-52℃ for 15-20 min. Then add acetic acid to neutralize, filter and dry to obtain hydrolyzed polyacrylonitrile. Add 8-10 parts by weight of hydrolyzed polyacrylonitrile to 50-60 parts by weight of dimethylformamide, stir at 80℃ for 2-3 h, then add 3-4 parts by weight of polyurethane, stir and mix for 3-4 h, and finally add 0.2-0.3 parts by weight of crosslinking agent, stir for 1-2 h to obtain hydrophilic spinning solution.

[0033] S4.3: Add 20-30 parts by weight of the above hydrolyzed polyacrylonitrile, 4-5 parts by weight of acrylic acid, 1-2 parts by weight of acrylamide, 0.012-0.013 parts by weight of potassium persulfate and 0.003-0.005 parts by weight of glutaraldehyde to 75-80 parts by weight of deionized water, react at 80-85℃ for 3-4 hours, then wash, filter and dry, and add to 50-60 parts by weight of lithium chloride-dimethylformamide solution at 80-82℃ and 0.3-0.5wt%, stir and mix for 1-2 hours, then add 5-8 parts by weight of polyurethane, stir and mix for 3-4 hours, and finally add 0.2-0.3 parts by weight of crosslinking agent, stir for 1-2 hours to obtain a superhydrophilic spinning solution;

[0034] S4.4: The hydrophilic spinning solution is electrospun onto the hydrophobic skin-friendly inner layer fabric to obtain a hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic spinning solution is electrospun onto the hydrophilic-hydrophobic skin-friendly inner layer fabric to obtain a superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric is heat-treated at 120-123℃ for 20-30 minutes to obtain a skin-friendly inner layer fabric with a gradient unidirectional moisture-wicking functional layer.

[0035] Furthermore, step S5, the preparation of the biomass multilayer fabric, specifically includes the following steps:

[0036] S5.1: Antibacterial bamboo fiber, cotton fiber and polyamide fiber are blended in a ratio of 3-4:3-4:1-2 to form a blended fabric, which is then woven to obtain an antibacterial and wear-resistant outer fabric.

[0037] S5.2: Connect the antibacterial and wear-resistant outer fabric and the skin-friendly inner fabric with a gradient unidirectional moisture-wicking function layer through a splicing wire to obtain a biomass multilayer fabric.

[0038] Furthermore, the crosslinking agent in steps S4.2 and S4.3 is a mixture of isocyanate and polyester polyol in a mass ratio of 1:5.

[0039] A garment made from the aforementioned biomass multilayer fabric.

[0040] Compared with the prior art, the present invention has at least the following beneficial effects:

[0041] 1. The fabric prepared by the present invention through a composite of three layers—a skin-friendly inner fabric, a gradient one-way moisture-wicking layer, and an antibacterial and wear-resistant outer fabric—is skin-friendly, soft, comfortable to wear, and quick-drying. It can be used in the preparation of professional clothing for sports and other activities, and can keep the skin dry and comfortable during high temperatures and strenuous exercise.

[0042] 2. This invention effectively reduces the hemicellulose content in bamboo fiber through acetic acid ball milling pretreatment, disrupting the internal bonds of the fiber, increasing the specific surface area, exposing the cell wall material, and thickening the bamboo fiber cell wall layer. The larger specific surface area provides sufficient chemical contact area for the modification of functional groups and chemical reagents. Bamboo fiber prepared by acetic acid ball milling pretreatment is softer and finer, with a smooth fabric feel. Furthermore, acetic acid ball milling pretreatment enables the bamboo fiber to form more chemical bonds, enhancing the integrity and density between bamboo fibers, thereby improving structural strength. Carboxymethylation further enhances the carboxyl content of the bamboo fiber. The methyl groups on the fiber surface are replaced with hydroxyl groups to improve surface activity. This allows the zinc ions in the subsequently added zinc chloride solution to replace the sodium ions in the sodium carboxymethyl group, enabling the zinc ions to successfully embed into the bamboo fiber and achieve chemical bonding. The antibacterial effect is maintained even after multiple washes. The cell structure of the carboxymethylated bamboo fiber is further decomposed, significantly increasing the specific surface area. The increased specific surface area facilitates rapid moisture absorption and diffusion. At the same time, the introduction of carboxymethyl groups significantly enhances the hydrophilicity of the fiber, improving its moisture absorption rate and water holding capacity. This allows the fabric made from the fiber to quickly absorb and diffuse sweat from the skin, keeping it dry.

[0043] 3. The cooling composite doped fiber prepared by this invention has hydroxylated boron nitride added to its inner layer, which has extremely high thermal conductivity and can quickly conduct heat from the skin surface, forming a cooling sensation upon contact. The hydroxylation treatment enhances its surface hydrophilicity, which not only improves its dispersibility in the fiber but also enhances its interfacial bonding with the matrix, reducing interfacial thermal resistance. Furthermore, the aragonite crystal structure of the nano-shell powder has natural micropores, which can quickly absorb sweat and promote evaporation. After the two are combined, the nano-shell powder can fill the gaps between the hydroxylated boron nitride particles. The polar surface of the hydroxylated boron nitride and the hydroxyl groups and calcium carbonate activity on the surface of the nano-shell powder... Sites can interact with each other through hydrogen bonds and van der Waals forces, reducing phase separation in the matrix and improving thermal conductivity. The porous structure of silica on the outer layer of the cooling composite doped fiber can assist in heat dissipation through air convection. The "core-shell" structure formed by coaxial spinning ensures uniform distribution of filler and prevents it from being lost. After multiple washes, the thermally conductive network remains stable, resulting in a long-lasting cooling effect. Furthermore, the cooling composite doped fiber has good thermal radiation properties, which is beneficial for sunlight reflection and has good radiative cooling properties. It can give the fabric a dual cooling effect of thermal conductivity and radiative cooling, thus maintaining a continuous cooling sensation.

[0044] 4. This invention constructs a gradient unidirectional moisture-wicking layer, enabling the fabric to possess excellent moisture-wicking and quick-drying properties. Through water-repellent treatment, the inner layer is hydrophobic, the middle layer is hydrophilic, and the outer layer is superhydrophilic, forming a surface energy gradient. When sweat comes into contact with the skin (hydrophobic inner layer), it can spontaneously and continuously transport moisture outward under the surface energy and capillary pressure difference, preventing backflow into the skin and achieving "unidirectional moisture wicking." Furthermore, the nanofiber network formed by electrospinning has high porosity and a gradient pore size distribution. Combined with the hydrogen bonding between the polar groups of the superhydrophilic layer and water molecules, the sweat transport rate is fast, achieving rapid drying in a short time. Its hydrophobic inner layer prevents sweat from back-permeating, so even if the outer layer is wet, the inner layer remains dry, avoiding a "sticky" feeling. The superhydrophilic outer layer rapidly diffuses sweat to the fabric surface, increasing the evaporation area and keeping the skin dry during exercise or in high-temperature environments. Attached Figure Description

[0045] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0046] Figure 1 This is a flowchart illustrating the preparation process of a biomass multilayer fabric used in an embodiment of the present invention. Detailed Implementation

[0047] The preparation method of a biomass multilayer fabric provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention. Example

[0048] A method for preparing a biomass multilayer fabric, such as Figure 1 As shown, it includes the following steps:

[0049] S1: Preparation of antibacterial bamboo fiber

[0050] S1.1: Mix 80-100 mesh dried bamboo powder with acetic acid solution at a solid-liquid ratio of 1:6 (g / mL), then place the mixture in a metal ball mill jar. Add zirconia balls with a diameter of 4.25 mm at a ball-to-material ratio of 1:2, and add zirconia balls with a diameter of 8.1 mm at a ball-to-material ratio of 1:1.5. Ball mill at 150℃ and 300 rpm under closed conditions for 2 hours. After ball milling, cool to room temperature to obtain the ball-milled mixture.

[0051] S1.2: The ball-milled mixture was continuously washed with deionized water until neutral, and then dried in a constant temperature oven at 60℃ for 12 hours to obtain pretreated bamboo fiber;

[0052] S1.3: 20 parts by weight of pretreated bamboo fiber and 200 parts by weight of 5 wt% sodium hydroxide solution were mixed and reacted at 75°C for 1 h. After the reaction was completed, 6.6 parts by weight of sodium chloroacetate and 240 parts by weight of deionized water were added and reacted at 75°C for 2 h. After the reaction was completed, the mixture was washed twice with anhydrous ethanol and then dried to obtain carboxymethylated modified bamboo fiber.

[0053] S1.4: 10 parts by weight of carboxymethylated modified bamboo fiber were added to 280 parts by weight of anhydrous ethanol, followed by 140 parts by weight of zinc chloride solution with a concentration of 30 wt%. The mixture was then heated in a water bath at 70°C for 2 hours, washed twice with deionized water, and finally dried to obtain antibacterial bamboo fiber.

[0054] S2: Preparation of Cooling Composite Doped Fibers

[0055] S2.1: Add 10 parts by weight of silica to 60 parts by weight of dimethylformamide, stir at room temperature for 20 min, then sonicate for 30 min, then add 15 parts by weight of waterborne polyurethane, stir and mix at 45°C for 4 h, and then let stand at room temperature for 10 h to obtain the outer spinning solution.

[0056] S2.2: Add 5 parts by weight of hydroxylated boron nitride and 2 parts by weight of nano-shell powder to 80 parts by weight of dimethylformamide and stir at room temperature for 20 min, then sonicate for 30 min, then add 15 parts by weight of waterborne polyurethane, stir and mix at 45°C for 4 h, and then let stand at room temperature for 10 h to obtain the inner layer spinning solution.

[0057] S2.3: Pour the outer spinning solution and the inner spinning solution into the syringe respectively. Use a coaxial needle with an inner diameter of 22G (0.7mm) and an outer diameter of 17G (1.4mm) to perform wet spinning at a spinning speed of 5mL / h. Use an injection pump to squeeze the spinning solution in the syringe into the coagulation bath. The spinning solution will quickly coagulate to obtain a cool-feeling composite doped fiber.

[0058] S3: Preparation of the skin-friendly inner layer fabric

[0059] S3.1: Add 8 parts by weight of collagen to 85 parts by weight of deionized water, then stir at 400 r / min for 4 h, then filter, degas and allow to stand and swell before adding glutaraldehyde. The amount of glutaraldehyde added is 3 wt% of the collagen protein. Stir and mix at 200 r / min for 20 min to obtain a composite collagen spinning solution.

[0060] S3.2: Use a syringe with a diameter of 19.05 mm and a capacity of 20 mL to draw up the composite collagen spinning solution, and then spin it through a wet spinning device to obtain collagen fibers.

[0061] S3.3: Collagen fiber, cooling composite doped fiber, diacetate fiber and modal fiber are blended in a ratio of 1:2:2:2 to make blended yarn. The blended yarn is woven into fabric by a loom to obtain a skin-friendly inner layer fabric.

[0062] S4: Construction of a gradient unidirectional humidification layer

[0063] S4.1: Dilute the finishing agent UNIDYNETG-5674 with deionized water to prepare a water-repellent finishing solution with a concentration of 30g / L. Then immerse the skin-friendly inner layer fabric in the water-repellent finishing solution, place it at room temperature for 1 hour, and then dehydrate and dry it to obtain a hydrophobic and skin-friendly inner layer fabric.

[0064] S4.2: Mix 10 parts by weight of polyacrylonitrile and 30 parts by weight of 2.5M sodium hydroxide solution and hydrolyze at 50°C for 15 min. Then add acetic acid to neutralize, filter and dry to obtain hydrolyzed polyacrylonitrile. Add 8 parts by weight of hydrolyzed polyacrylonitrile to 50 parts by weight of dimethylformamide and stir at 80°C for 2 h. Then add 3 parts by weight of polyurethane and stir for 3 h. Finally add 0.2 parts by weight of crosslinking agent and stir for 1 h to obtain hydrophilic spinning solution.

[0065] S4.3: 20 parts by weight of the above hydrolyzed polyacrylonitrile, 4 parts by weight of acrylic acid, 1 part by weight of acrylamide, 0.012 parts by weight of potassium persulfate and 0.003 parts by weight of glutaraldehyde were added to 75 parts by weight of deionized water and reacted at 80°C for 3 hours. After washing, filtering and drying, the solution was added to 50 parts by weight of 0.3 wt% lithium chloride-dimethylformamide solution at 80°C and stirred for 1 hour. Then, 5 parts by weight of polyurethane were added and stirred for 3 hours. Finally, 0.2 parts by weight of crosslinking agent were added and stirred for 1 hour to obtain a superhydrophilic spinning solution.

[0066] S4.4: The hydrophilic spinning solution is electrospun onto the hydrophobic skin-friendly inner layer fabric under the conditions of voltage 15KV, rotation speed 0.4r / s, and feeding rate 0.8cm / h to obtain the hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic spinning solution is electrospun onto the hydrophilic-hydrophobic skin-friendly inner layer fabric under the conditions of voltage 30KV, rotation speed 0.4r / s, and feeding rate 0.8cm / h to obtain the superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric is heat-treated at 120℃ for 20min to obtain the skin-friendly inner layer fabric with a gradient unidirectional moisture-wicking functional layer.

[0067] S5: Preparation of Biomass Multilayer Fabrics

[0068] S5.1: Antibacterial bamboo fiber, cotton fiber and polyamide fiber are blended in a ratio of 3:3:1 to make blended yarn, which is then woven to obtain an antibacterial and wear-resistant outer fabric.

[0069] S5.2: Connect the antibacterial and wear-resistant outer fabric and the skin-friendly inner fabric with a gradient unidirectional moisture-wicking function layer through a splicing wire to obtain a biomass multilayer fabric. Example

[0070] A method for preparing a biomass multilayer fabric, such as Figure 1 As shown, it includes the following steps:

[0071] S1: Preparation of antibacterial bamboo fiber

[0072] S1.1: Mix 80-100 mesh dried bamboo powder with acetic acid solution at a solid-liquid ratio of 1:6 (g / mL), then place the mixture in a metal ball mill jar. Add zirconia balls with a diameter of 4.25 mm at a ball-to-material ratio of 1:2, and add zirconia balls with a diameter of 8.1 mm at a ball-to-material ratio of 1:1.5. Ball mill at 150℃ and 300 rpm under closed conditions for 2 hours. After ball milling, cool to room temperature to obtain the ball-milled mixture.

[0073] S1.2: The ball-milled mixture was continuously washed with deionized water until neutral, and then dried in a constant temperature oven at 60℃ for 12 hours to obtain pretreated bamboo fiber;

[0074] S1.3: 23 parts by weight of pretreated bamboo fiber and 230 parts by weight of sodium hydroxide solution with a concentration of 5 wt% were mixed and reacted at 75°C for 1 h. After the reaction was completed, 7.2 parts by weight of sodium chloroacetate and 260 parts by weight of deionized water were added and reacted at 75°C for 2 h. After the reaction was completed, the mixture was washed twice with anhydrous ethanol and then dried to obtain carboxymethylated modified bamboo fiber.

[0075] S1.4: 12 parts by weight of carboxymethylated modified bamboo fiber were added to 300 parts by weight of anhydrous ethanol, followed by 160 parts by weight of zinc chloride solution with a concentration of 30wt%, and then heated in a water bath at 70°C for 2 hours. After washing twice with deionized water, the mixture was dried to obtain antibacterial bamboo fiber.

[0076] S2: Preparation of Cooling Composite Doped Fibers

[0077] S2.1: Add 12 parts by weight of silica to 80 parts by weight of dimethylformamide, stir at room temperature for 20 min, then sonicate for 30 min, then add 20 parts by weight of waterborne polyurethane, stir and mix at 45°C for 4 h, and then let stand at room temperature for 10 h to obtain the outer spinning solution.

[0078] S2.2: Add 10 parts by weight of hydroxylated boron nitride and 5 parts by weight of nano-shell powder to 90 parts by weight of dimethylformamide and stir at room temperature for 20 min, then sonicate for 30 min, then add 20 parts by weight of waterborne polyurethane, stir and mix at 45°C for 4 h, and then let stand at room temperature for 10 h to obtain the inner layer spinning solution.

[0079] S2.3: Pour the outer spinning solution and the inner spinning solution into the syringe respectively. Use a coaxial needle with an inner diameter of 22G (0.7mm) and an outer diameter of 17G (1.4mm) to perform wet spinning at a spinning speed of 5mL / h. Use an injection pump to squeeze the spinning solution in the syringe into the coagulation bath. The spinning solution will quickly coagulate to obtain a cool-feeling composite doped fiber.

[0080] S3: Preparation of the skin-friendly inner layer fabric

[0081] S3.1: Add 10 parts by weight of collagen to 90 parts by weight of deionized water, then stir at 400 r / min for 4 h, then filter, degas and allow to stand and swell, then add glutaraldehyde, the amount of glutaraldehyde added is 5 wt% of the collagen protein, stir and mix at 200 r / min for 20 min to obtain the composite collagen spinning solution.

[0082] S3.2: Use a syringe with a diameter of 19.05 mm and a capacity of 20 mL to draw up the composite collagen spinning solution, and then spin it through a wet spinning device to obtain collagen fibers.

[0083] S3.3: Collagen fiber, cooling composite doped fiber, diacetate fiber and modal fiber are blended in a ratio of 3:4:3:4 to make blended yarn. The blended yarn is woven into fabric by a loom to obtain a skin-friendly inner layer fabric.

[0084] S4: Construction of a gradient unidirectional humidification layer

[0085] S4.1: Dilute the finishing agent UNIDYNETG-5674 with deionized water to prepare a water-repellent finishing solution with a concentration of 40g / L. Then immerse the skin-friendly inner layer fabric in the water-repellent finishing solution, place it at room temperature for 1 hour, and then dehydrate and dry it to obtain a hydrophobic and skin-friendly inner layer fabric.

[0086] S4.2: Mix 12 parts by weight of polyacrylonitrile and 35 parts by weight of 2.5M sodium hydroxide solution and hydrolyze at 50°C for 15 min. Then add acetic acid to neutralize, filter and dry to obtain hydrolyzed polyacrylonitrile. Add 10 parts by weight of hydrolyzed polyacrylonitrile to 60 parts by weight of dimethylformamide and stir at 80°C for 2 h. Then add 4 parts by weight of polyurethane and stir for 3 h. Finally add 0.3 parts by weight of crosslinking agent and stir for 1 h to obtain hydrophilic spinning solution.

[0087] S4.3: 30 parts by weight of the above hydrolyzed polyacrylonitrile, 5 parts by weight of acrylic acid, 2 parts by weight of acrylamide, 0.013 parts by weight of potassium persulfate and 0.005 parts by weight of glutaraldehyde were added to 80 parts by weight of deionized water and reacted at 80°C for 3 hours. After washing, filtering and drying, the solution was added to 60 parts by weight of 0.5 wt% lithium chloride-dimethylformamide solution at 80°C and stirred for 1 hour. Then, 8 parts by weight of polyurethane were added and stirred for 3 hours. Finally, 0.3 parts by weight of crosslinking agent were added and stirred for 1 hour to obtain a superhydrophilic spinning solution.

[0088] S4.4: The hydrophilic spinning solution is electrospun onto the hydrophobic skin-friendly inner layer fabric under the conditions of voltage 15KV, rotation speed 0.4r / s, and feeding rate 0.8cm / h to obtain the hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic spinning solution is electrospun onto the hydrophilic-hydrophobic skin-friendly inner layer fabric under the conditions of voltage 30KV, rotation speed 0.4r / s, and feeding rate 0.8cm / h to obtain the superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric is heat-treated at 120℃ for 20min to obtain the skin-friendly inner layer fabric with a gradient unidirectional moisture-wicking functional layer.

[0089] S5: Preparation of Biomass Multilayer Fabrics

[0090] S5.1: Antibacterial bamboo fiber, cotton fiber and polyamide fiber are blended in a ratio of 4:4:2 to make blended yarn, which is then woven to obtain an antibacterial and wear-resistant outer fabric.

[0091] S5.2: Connect the antibacterial and wear-resistant outer fabric and the skin-friendly inner fabric with a gradient unidirectional moisture-wicking function layer through a splicing wire to obtain a biomass multilayer fabric. Example

[0092] A method for preparing a biomass multilayer fabric, such as Figure 1 As shown, it includes the following steps:

[0093] S1: Preparation of antibacterial bamboo fiber

[0094] S1.1: Mix 80-100 mesh dried bamboo powder with acetic acid solution at a solid-liquid ratio of 1:6 (g / mL), then place the mixture in a metal ball mill jar. Add zirconia balls with a diameter of 4.25 mm at a ball-to-material ratio of 1:2, and add zirconia balls with a diameter of 8.1 mm at a ball-to-material ratio of 1:1.5. Ball mill at 180℃ and 500 rpm under closed conditions for 3 hours. After ball milling, cool to room temperature to obtain the ball-milled mixture.

[0095] S1.2: The ball-milled mixture was continuously washed with deionized water until neutral, and then dried in a constant temperature oven at 70℃ for 14 hours to obtain pretreated bamboo fiber;

[0096] S1.3: 20 parts by weight of pretreated bamboo fiber and 200 parts by weight of sodium hydroxide solution with a concentration of 5 wt% were mixed and reacted at 80°C for 2 h. After the reaction was completed, 6.6 parts by weight of sodium chloroacetate and 240 parts by weight of deionized water were added and reacted at 80°C for 3 h. After the reaction was completed, the mixture was washed 3 times with anhydrous ethanol and then dried to obtain carboxymethylated modified bamboo fiber.

[0097] S1.4: 10 parts by weight of carboxymethylated modified bamboo fiber were added to 280 parts by weight of anhydrous ethanol, followed by 140 parts by weight of zinc chloride solution with a concentration of 30wt%, and then heated in a water bath at 80℃ for 3 hours. After washing with deionized water 3 times, the mixture was dried to obtain antibacterial bamboo fiber.

[0098] S2: Preparation of Cooling Composite Doped Fibers

[0099] S2.1: Add 10 parts by weight of silica to 60 parts by weight of dimethylformamide, stir at room temperature for 30 min, then sonicate for 40 min, then add 15 parts by weight of waterborne polyurethane, stir and mix at 50°C for 5 h, and then let stand at room temperature for 12 h to obtain the outer spinning solution.

[0100] S2.2: Add 5 parts by weight of hydroxylated boron nitride and 2 parts by weight of nano-shell powder to 80 parts by weight of dimethylformamide and stir at room temperature for 30 min, then sonicate for 40 min, then add 15 parts by weight of waterborne polyurethane, stir and mix at 50℃ for 5 h, and then let stand at room temperature for 12 h to obtain the inner layer spinning solution.

[0101] S2.3: Pour the outer spinning solution and the inner spinning solution into the syringe respectively. Use a coaxial needle with an inner diameter of 22G (0.7mm) and an outer diameter of 17G (1.4mm) to perform wet spinning at a spinning speed of 8mL / h. Use an injection pump to squeeze the spinning solution in the syringe into the coagulation bath. The spinning solution will quickly coagulate to obtain a cool-feeling composite doped fiber.

[0102] S3: Preparation of the skin-friendly inner layer fabric

[0103] S3.1: Add 8 parts by weight of collagen to 85 parts by weight of deionized water, stir at 500 r / min for 5 h, then filter, degas and allow to stand and swell before adding glutaraldehyde. The amount of glutaraldehyde added is 3 wt% of the collagen protein. Stir and mix at 300 r / min for 30 min to obtain a composite collagen spinning solution.

[0104] S3.2: Use a syringe with a diameter of 19.05 mm and a capacity of 20 mL to draw up the composite collagen spinning solution, and then spin it through a wet spinning device to obtain collagen fibers.

[0105] S3.3: Collagen fiber, cooling composite doped fiber, diacetate fiber and modal fiber are blended in a ratio of 1:2:2:2 to make blended yarn. The blended yarn is woven into fabric by a loom to obtain a skin-friendly inner layer fabric.

[0106] S4: Construction of a gradient unidirectional humidification layer

[0107] S4.1: Dilute the finishing agent UNIDYNETG-5674 with deionized water to prepare a water-repellent finishing solution with a concentration of 30g / L. Then immerse the skin-friendly inner layer fabric in the water-repellent finishing solution, place it at room temperature for 2 hours, and then dehydrate and dry it to obtain a hydrophobic and skin-friendly inner layer fabric.

[0108] S4.2: Mix 10 parts by weight of polyacrylonitrile and 30 parts by weight of 2.5M sodium hydroxide solution and hydrolyze at 52℃ for 20 min. Then add acetic acid to neutralize, filter and dry to obtain hydrolyzed polyacrylonitrile. Add 8 parts by weight of hydrolyzed polyacrylonitrile to 50 parts by weight of dimethylformamide and stir at 80℃ for 3 h. Then add 3 parts by weight of polyurethane and stir for 4 h. Finally add 0.2 parts by weight of crosslinking agent and stir for 2 h to obtain hydrophilic spinning solution.

[0109] S4.3: 20 parts by weight of the above hydrolyzed polyacrylonitrile, 4 parts by weight of acrylic acid, 1 part by weight of acrylamide, 0.012 parts by weight of potassium persulfate and 0.003 parts by weight of glutaraldehyde were added to 75 parts by weight of deionized water and reacted at 85°C for 4 hours. After washing, filtering and drying, the solution was added to 50 parts by weight of 0.3 wt% lithium chloride-dimethylformamide solution at 82°C and stirred for 2 hours. Then, 5 parts by weight of polyurethane were added and stirred for 4 hours. Finally, 0.2 parts by weight of crosslinking agent were added and stirred for 2 hours to obtain a superhydrophilic spinning solution.

[0110] S4.4: The hydrophilic spinning solution is electrospun onto the hydrophobic skin-friendly inner layer fabric under the conditions of voltage 16KV, rotation speed 0.5r / s, and feeding rate 0.9cm / h to obtain the hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic spinning solution is electrospun onto the hydrophilic-hydrophobic skin-friendly inner layer fabric under the conditions of voltage 32KV, rotation speed 0.5r / s, and feeding rate 0.9cm / h to obtain the superhydrophilic-hydrophobic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic-hydrophobic-hydrophobic skin-friendly inner layer fabric is heat-treated at 123℃ for 30min to obtain the skin-friendly inner layer fabric with a gradient unidirectional moisture-wicking functional layer.

[0111] S5: Preparation of Biomass Multilayer Fabrics

[0112] S5.1: Antibacterial bamboo fiber, cotton fiber and polyamide fiber are blended in a ratio of 3:3:1 to make blended yarn, which is then woven to obtain an antibacterial and wear-resistant outer fabric.

[0113] S5.2: Connect the antibacterial and wear-resistant outer fabric and the skin-friendly inner fabric with a gradient unidirectional moisture-wicking function layer through a splicing wire to obtain a biomass multilayer fabric.

[0114] Comparative Example 1

[0115] Compared with Example 1, Comparative Example 1 differs in that steps S1.1-S1.2 are removed, and the pretreated bamboo fiber in S1.3 is replaced with natural bamboo fiber, while the remaining steps remain unchanged to prepare the biomass multilayer fabric, which is referred to as Comparative Example 1.

[0116] Comparative Example 2

[0117] Compared with Example 1, Comparative Example 2 differs in that step S1.3 is removed, and the carboxymethylated bamboo fiber in step S1.4 is replaced with pretreated bamboo fiber, while the remaining steps remain unchanged to prepare the biomass multilayer fabric, which is referred to as Comparative Example 2.

[0118] Comparative Example 3

[0119] Compared with Example 1, Comparative Example 3 differs in that the hydroxylated boron nitride in step S2.2 is replaced with boron nitride, while the other steps remain unchanged to prepare the biomass multilayer fabric, and is referred to as Comparative Example 3.

[0120] Comparative Example 4

[0121] Compared with Example 1, Comparative Example 4 differs in that steps S2.1 and S2.3 are removed in Comparative Example 4, and the inner spinning solution is directly wet spun to obtain cool-feeling composite doped fiber. The remaining steps are unchanged to prepare biomass multilayer fabric, and it is referred to as Comparative Example 4.

[0122] Comparative Example 5

[0123] Compared with Example 1, Comparative Example 5 differs in that step S4 is removed in Comparative Example 5, and the skin-friendly inner fabric with gradient unidirectional moisture-wicking function layer in S5.2 is replaced with the skin-friendly inner fabric in S3.3, while the other steps remain unchanged to prepare the biomass multilayer fabric, which is referred to as Comparative Example 5.

[0124] Comparative Example 6

[0125] Compared with Example 1, Comparative Example 6 differs in that it removes step S4.2, which involves adding 8 parts by weight of hydrolyzed polyacrylonitrile to 50 parts by weight of dimethylformamide, stirring at 80°C for 2 hours, then adding 3 parts by weight of polyurethane, stirring and mixing for 3 hours, and finally adding 0.2 parts by weight of crosslinking agent and stirring for 1-2 hours to obtain a hydrophilic spinning solution. Instead, it directly electrospins the superhydrophilic spinning solution onto a hydrophobic and skin-friendly inner layer fabric, while keeping the other steps unchanged to prepare a biomass multilayer fabric. This is referred to as Comparative Example 6.

[0126] The specific surface area of ​​the antibacterial bamboo fibers prepared in Examples 1-3 and Comparative Examples 1-2 was tested, and the test results are shown in Table 1.

[0127] Table 1. Specific surface area test results of antibacterial bamboo fiber

[0128] <![CDATA[Specific surface area (m 2 / g)]]> Example 1 23.43 Example 2 23.53 Example 3 23.49 Comparative Example 1 18.34 Comparative Example 2 1.23 Natural bamboo fiber 0.57

[0129] As can be seen from the data in Table 1, the acetic acid ball milling pretreatment increases the specific surface area of ​​bamboo fiber, and carboxymethylation further significantly increases the specific surface area of ​​bamboo fiber. The large specific surface area is conducive to the rapid absorption and diffusion of moisture in the prepared fabric.

[0130] The thermal conductivity and reflectance of the biomass multilayer fabrics prepared in Examples 1-3 and Comparative Examples 3-4 were tested. The thermal conductivity was measured again after the biomass multilayer fabrics were washed 500 times. The results are shown in Table 2.

[0131] Table 2. Thermal conductivity test results

[0132] Thermal conductivity (W / m·K) Thermal conductivity (W / m·K) after 500 washes Reflectance of visible and near-infrared light in the 400nm-2500nm range (%) Example 1 2.173 2.172 91 Example 2 2.175 2.172 92 Example 3 2.176 2.174 91 Comparative Example 3 1.834 1.823 90 Comparative Example 4 2.142 1.882 75

[0133] As can be seen from the data in Table 2, the hydroxylated boron nitride added to the inner layer can interact with the nano-shell powder to improve thermal conductivity, and the "core-shell" structure formed by coaxial spinning can maintain the stability of the thermally conductive network and improve the durability of the cooling effect. The reflectance of visible light and near-infrared light in the 400nm-2500nm range shows that the cooling composite doped fiber has good thermal radiation performance, which is beneficial for sunlight reflection and has good radiative cooling performance.

[0134] Evaporation rate and unidirectional transfer index were tested for Examples 1-3 and Comparative Examples 5-6. The test results are shown in Table 3.

[0135] Table 3. Results of Evaporation Rate Test and Unidirectional Transfer Index Measurement

[0136] Evaporation rate (g / h) One-way transmission index Example 1 0.41 Level 5 Example 2 0.43 Level 5 Example 3 0.43 Level 5 Comparative Example 5 0.22 Level 3 Comparative Example 6 0.34 Level 4

[0137] As can be seen from the data in Table 3, the gradient unidirectional humidification layer constructed in this invention can significantly improve the evaporation rate and unidirectional transfer index, indicating that it has unidirectional humidification and quick-drying properties.

[0138] The antibacterial properties of the biomass multilayer fabrics prepared in Examples 1-3 and Comparative Example 2 were tested, and the antibacterial properties were measured again after the fabrics were washed 50 times. The test results are shown in Table 4.

[0139] Table 4. Antibacterial test results

[0140] As can be seen from the data in Table 4, using carboxymethylated bamboo fiber combined with zinc chloride can enable the fabric to maintain its antibacterial effect after multiple washes.

[0141] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A biomass multilayer fabric, characterized in that, It consists of an inner layer, a middle layer and an outer layer. The inner layer is a skin-friendly inner layer fabric, the middle layer is a gradient one-way moisture-wicking layer, and the outer layer is an antibacterial and wear-resistant outer layer fabric. The skin-friendly inner layer fabric is made by blending and weaving collagen fiber, cooling composite doped fiber, diacetate fiber and modal fiber; The cooling composite doped fiber is obtained by coaxial wet spinning of silicon dioxide, waterborne polyurethane as the outer layer, and hydroxylated boron nitride, nano-shell powder, and waterborne polyurethane as the inner layer. The gradient unidirectional moisture-wicking layer is obtained by hydrophobically finishing the skin-friendly inner layer fabric, followed by electrospinning a hydrophilic spinning solution prepared by hydrolyzed polyacrylonitrile and polyurethane to obtain a hydrophilic-hydrophobic skin-friendly inner layer fabric. The hydrophilic-hydrophobic skin-friendly inner layer fabric is obtained by electrospinning a mixture of hydrolyzed polyacrylonitrile, acrylic acid, acrylamide, potassium persulfate and glutaraldehyde into a superhydrophilic spinning solution prepared by polyurethane. The antibacterial and wear-resistant outer fabric is made by blending and weaving antibacterial bamboo fiber, cotton fiber and polyamide fiber. The antibacterial bamboo fiber is prepared by first ball milling bamboo powder with acetic acid solution to obtain pretreated bamboo fiber, then reacting it with sodium hydroxide solution, then adding sodium chloroacetate for modification, and finally modifying it with zinc chloride.

2. A method for preparing a biomass multilayer fabric as described in claim 1, characterized in that, Includes the following steps: S1: Preparation of antibacterial bamboo fiber; S2: Preparation of cooling composite doped fibers; S3: Preparation of skin-friendly inner layer fabric; S4: Construction of a gradient unidirectional humidification layer; S5: Preparation of biomass multilayer fabric.

3. The method for preparing a biomass multilayer fabric according to claim 2, characterized in that, Step S1, the preparation of antibacterial bamboo fiber, specifically includes the following steps: S1.1: Mix 80-100 mesh dried bamboo powder with acetic acid solution at a solid-liquid ratio of 1:6 (g / mL), then place the mixture in a metal ball mill jar and ball mill for 2-3 hours at 150-180℃ and 300-500rpm under closed conditions to obtain a ball-milled mixture; S1.2: The ball-milled mixture is continuously washed with deionized water until neutral, then dried to obtain pretreated bamboo fiber; S1.3: Mix 20-23 parts by weight of pretreated bamboo fiber and 200-230 parts by weight of 5 wt% sodium hydroxide solution, and react at 75-80℃ for 1-2 h. After the reaction is complete, add 6.6-7.2 parts by weight of sodium chloroacetate and 240-260 parts by weight of deionized water, and react at 75-80℃ for 2-3 h. After the reaction is complete, wash with anhydrous ethanol 2-3 times, and then dry to obtain carboxymethylated modified bamboo fiber. S1.4: Add 10-12 parts by weight of carboxymethylated modified bamboo fiber to 280-300 parts by weight of anhydrous ethanol, then add 140-160 parts by weight of 30wt% zinc chloride solution, then heat in a water bath at 70-80℃ for 2-3 hours, then wash with deionized water 2-3 times, and finally dry to obtain antibacterial bamboo fiber.

4. The method for preparing a biomass multilayer fabric according to claim 3, characterized in that, Step S2, the preparation of the cooling composite doped fiber, specifically includes the following steps: S2.1: Add 10-12 parts by weight of silica to 60-80 parts by weight of dimethylformamide, stir at room temperature for 20-30 minutes, then sonicate for 30-40 minutes, then add 15-20 parts by weight of waterborne polyurethane, stir and mix at 45-50℃ for 4-5 hours to obtain the outer spinning solution. S2.2: Add 5-10 parts by weight of hydroxylated boron nitride and 2-5 parts by weight of nano-shell powder to 80-90 parts by weight of dimethylformamide and stir at room temperature for 20-30 minutes. Then sonicate for 30-40 minutes, add 15-20 parts by weight of waterborne polyurethane, stir and mix at 45-50℃ for 4-5 hours, and then let stand at room temperature for 10-12 hours to obtain the inner layer spinning solution. S2.3: The outer spinning solution and the inner spinning solution are wet-spun using a coaxial needle to obtain a cool-feeling composite doped fiber.

5. The method for preparing a biomass multilayer fabric according to claim 4, characterized in that, Step S3, the preparation of the skin-friendly inner layer fabric, specifically includes the following steps: S3.1: Add 8-10 parts by weight of collagen to 85-90 parts by weight of deionized water, then stir at 400-500 r / min for 4-5 h, then filter, degas and allow to stand and swell before adding glutaraldehyde, the amount of glutaraldehyde added is 3-5 wt% of the collagen protein, and stir and mix at 200-300 r / min for 20-30 min to obtain a composite collagen spinning solution; S3.2: Use a syringe to draw up the composite collagen spinning solution, and then spin it through a wet spinning device to obtain collagen fibers; S3.3: Collagen fiber, cooling composite doped fiber, diacetate fiber and modal fiber are blended and woven in a ratio of 1-3:2-4:2-3:2-4 to obtain a skin-friendly inner layer fabric.

6. The method for preparing a biomass multilayer fabric according to claim 5, characterized in that, Step S4, the construction of the gradient unidirectional humidification layer, specifically includes the following steps: S4.1: Dilute the finishing agent UNIDYNETG-5674 with deionized water to prepare a water-repellent finishing solution with a concentration of 30-40g / L. Use the water-repellent finishing solution to finish the skin-friendly inner layer fabric to obtain a hydrophobic and skin-friendly inner layer fabric. S4.2: Mix 10-12 parts by weight of polyacrylonitrile and 30-35 parts by weight of 2.5M sodium hydroxide solution, and hydrolyze at 50-52℃ for 15-20 min. Then add acetic acid to neutralize, filter and dry to obtain hydrolyzed polyacrylonitrile. Add 8-10 parts by weight of hydrolyzed polyacrylonitrile to 50-60 parts by weight of dimethylformamide, stir at 80℃ for 2-3 h, then add 3-4 parts by weight of polyurethane, stir and mix for 3-4 h, and finally add 0.2-0.3 parts by weight of crosslinking agent, stir for 1-2 h to obtain hydrophilic spinning solution. S4.3: Add 20-30 parts by weight of the above hydrolyzed polyacrylonitrile, 4-5 parts by weight of acrylic acid, 1-2 parts by weight of acrylamide, 0.012-0.013 parts by weight of potassium persulfate and 0.003-0.005 parts by weight of glutaraldehyde to 75-80 parts by weight of deionized water, react at 80-85℃ for 3-4 hours, then wash, filter and dry, and add to 50-60 parts by weight of lithium chloride-dimethylformamide solution at 80-82℃ and 0.3-0.5wt%, stir and mix for 1-2 hours, then add 5-8 parts by weight of polyurethane, stir and mix for 3-4 hours, and finally add 0.2-0.3 parts by weight of crosslinking agent, stir for 1-2 hours to obtain a superhydrophilic spinning solution; S4.4: The hydrophilic spinning solution is electrospun onto the hydrophobic skin-friendly inner layer fabric to obtain a hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic spinning solution is electrospun onto the hydrophilic-hydrophobic skin-friendly inner layer fabric to obtain a superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric. The superhydrophilic-hydrophilic-hydrophobic skin-friendly inner layer fabric is heat-treated at 120-123℃ for 20-30 minutes to obtain a skin-friendly inner layer fabric with a gradient unidirectional moisture-wicking functional layer.

7. The method for preparing a biomass multilayer fabric according to claim 6, characterized in that, Step S5, the preparation of the biomass multilayer fabric, specifically includes the following steps: S5.1: Antibacterial bamboo fiber, cotton fiber and polyamide fiber are blended in a ratio of 3-4:3-4:1-2 to form a blended fabric, which is then woven to obtain an antibacterial and wear-resistant outer fabric. S5.2: Connect the antibacterial and wear-resistant outer fabric and the skin-friendly inner fabric with a gradient unidirectional moisture-wicking function layer through a splicing wire to obtain a biomass multilayer fabric.

8. The method for preparing a biomass multilayer fabric according to claim 6, characterized in that, The crosslinking agent in steps S4.2 and S4.3 is a mixture of isocyanate and polyester polyol in a mass ratio of 1:

5.

9. A garment, characterized in that, The garment is made from the biomass multilayer fabric described in claim 1.

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