A wear-resistant and radiation-proof functional fabric and its preparation method

Abstract

This invention discloses a wear-resistant and radiation-proof functional fabric and its preparation method, relating to the field of fabric technology. The fabric prepared by this invention has a three-layer structure, comprising a shielding layer, a wear-resistant layer, and a coating layer disposed on the surface of the wear-resistant layer. The shielding layer of this invention uses cotton fabric as a base material, polymerized and bonded to radiation-proof fillers via an aniline structure, improving the electromagnetic shielding effect of the fabric. Furthermore, it does not easily detach after multiple washes, thus achieving a long-term shielding effect. The coating layer and the wear-resistant layer are chemically bonded, reducing the damaging effect of washing. The addition of graphene and molybdenum disulfide to the coating layer fully utilizes their rigidity and lubricity, effectively improving the wear resistance of the coating layer. Simultaneously, graphene and molybdenum disulfide can participate in the polymerization of coating monomers, forming a flexible alkyl long-chain structure, reducing the friction coefficient of the fabric fibers, and further improving the wear resistance of the fabric.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a wear-resistant and radiation-resistant functional fabric and its preparation method. Background Technology

[0002] Fabric is the material used to make clothing. There are many types of fabrics, and most fabrics used to make clothing have the characteristics of being comfortable to wear, sweat-absorbent, and breathable. In workshop and construction work, clothing is often rubbed against hard and rough objects, and the high-intensity work process can easily cause sweating. Therefore, the abrasion resistance of uniforms determines the lifespan and comfort of clothing. In the current abrasion-resistant fabric preparation process, nylon fiber is usually used. Because nylon fiber has strong toughness and abrasion resistance, it can prevent clothing from being worn. However, its abrasion resistance still cannot meet the requirements.

[0003] With the development of science and technology, radiation, as an "invisible killer" harming the human body, has gradually become recognized, and the research on radiation-shielding materials has become an important direction in current materials research. Electromagnetic radiation refers to the phenomenon of electromagnetic waves emitted or leaking into space, generated by the interaction of electric and magnetic fields. With the widespread application of electromagnetic radiation in fields such as communication, transportation, medicine, and military, the human living environment is increasingly polluted by electromagnetic radiation. Existing research shows that electromagnetic radiation can affect biological tissues and even cause damage through various mechanisms. Electromagnetic radiation protection has become a research hotspot for scholars worldwide.

[0004] Currently, research on processing nanomaterials into fabrics with good wave absorption performance, washability, wearing comfort, and structural stability is still in its early stages. Existing manufacturing technologies for nano-type radiation protection fabrics mainly fall into three categories: composite spinning technology, chemical plating or electroplating technology for fabrics, and coating finishing methods for shielding fabrics. The common drawbacks of these technologies are poor fastness, easy peeling, and uneven distribution. However, the addition of nanomaterials and polymer materials effectively solves these problems. This method can greatly improve the wave absorption capacity of the fabric, thereby providing better protection for the human body. Summary of the Invention

[0005] The purpose of this invention is to provide a wear-resistant and radiation-resistant functional fabric and its preparation method, so as to solve the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a wear-resistant and radiation-proof functional fabric, comprising a shielding layer and a wear-resistant layer, wherein a coating layer is disposed on the surface of the wear-resistant layer, and the shielding layer is prepared by:

[0007] (1) Mix the pretreatment agent, sodium dihydrogen phosphate and deionized water in a mass ratio of 15:5:80, soak the cotton fabric in a bath ratio of 1:20-30 for 10-20 minutes, and use a padding machine to treat the soaked cotton fabric to remove excess water and maintain a padding rate of 80-85%. After two dips and two paddings, bake at 100℃ for 10 minutes to obtain the pretreated fabric.

[0008] (2) Mix radiation-proof filler, 1.0 mol / L hydrochloric acid, and aniline in a ratio of 8-15 g: 160 mL: 3-5 g. Immerse the pretreated fabric in the mixture at a bath ratio of 1:20-30. Add 1% of the total mass of ammonium persulfate. React at 5-15°C for 4 hours under a nitrogen atmosphere, and then react at room temperature for 20 hours. Remove the fabric and wash it with 1.0 mol / L hydrochloric acid until no SO4 is detected by BaCl2 solution. 2- Then rinse with acetone for 3-5 minutes and vacuum dry at 40°C for 12 hours to obtain the shielding layer.

[0009] Further, the pretreatment agent in step (1) is at least one of p-aminophenylacetic acid, 3-aminophenylacetic acid, 2-(4-aminophenyl)propionic acid, and 4-amino-2-methylphenylacetic acid.

[0010] Furthermore, the weight of the cotton fabric in step (1) is 100-120 g / m². 2 .

[0011] Furthermore, the radiation-shielding filler in step (2) includes at least one of nano tin dioxide, nano cerium dioxide, nano erbium oxide, nano tin oxide antimony ATO, boron nitride nanosheets, boron nitride whiskers, graphene, carbon nanotubes, and carbon black.

[0012] Furthermore, the radiation-shielding filler described in step (2) is also surface-modified with p-aminophenyltrimethoxysilane.

[0013] Furthermore, the mass ratio of nylon fiber to polyester fiber in the wear-resistant layer is 10-20:10-20.

[0014] Furthermore, the coating layer comprises, by weight, 20-45 parts solvent, 20-40 parts (meth)acrylic acid, 5-10 parts filler, and 10-15 parts hydroxyethyl methacrylate.

[0015] Furthermore, the solvent is at least one of butanol, isopropanol, n-propanol, isobutanol, sec-butanol, tert-butanol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol monobutyl ether.

[0016] Furthermore, the filler is graphene nanoparticles and molybdenum disulfide nanoparticles, both of which are surface-modified with methacryloyloxymethyltrimethoxysilane.

[0017] Furthermore, the preparation steps include the following:

[0018] S1: The abrasion-resistant layer is pretreated and then sewn together with the shielding layer to obtain the fabric;

[0019] S2: Add (meth)acrylic acid, filler, and hydroxyethyl methacrylate to the solvent, add an initiator, react at 50-120℃ for 30 minutes, then coat it onto one side of the abrasion-resistant layer of the fabric, bake at 140℃ for 30 minutes, coat it again, and bake at 140℃ for 30 minutes. The coating amount each time is 10-15 g / m². 2 .

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0021] The fabric prepared by this invention has a three-layer structure, including a shielding layer, a wear-resistant layer, and a coating layer on the surface of the wear-resistant layer.

[0022] The shielding layer of this invention uses cotton fabric as the base material. It is first pretreated to load a large number of aniline molecular structures on its surface, so that it can polymerize with radiation-shielding filler carrying aniline groups to form polyaniline. At the same time, it also promotes the deposition of radiation-shielding filler on the fiber surface and in the gaps between fibers. Polyaniline contains a large number of benzene ring structures, which have a certain shielding effect on electromagnetic fields. After being exposed to high-energy radiation, it does not produce radiation cross-linking or chemical degradation reactions. Together with the radiation-shielding filler, it improves the electromagnetic shielding effect of the fabric. The filler and the fabric are connected by chemical bonds, and the fabric is sewn together in the later stage to firmly lock the filler on the surface of the cotton fabric, so that the fabric will not easily fall off after multiple washes, thus achieving a long-term shielding effect.

[0023] The wear-resistant layer of this invention is constructed from fibers with excellent wear resistance, which initially improves the wear resistance of the fabric. The coating layer is chemically bonded to the wear-resistant layer, reducing the damaging effect of washing. Graphene and molybdenum disulfide are added to the coating layer. After surface modification, both have high dispersibility, fully utilizing their rigidity and lubricity to effectively improve the wear resistance of the coating layer. At the same time, they can also participate in the polymerization of coating monomers to form a flexible alkyl long-chain structure. When the fabric fibers rub against other objects, the flexible alkyl long chains on the fabric surface undergo compression, deformation, and other movements, thereby reducing the friction coefficient of the fabric fibers, preventing fabric wear, and further improving the wear resistance of the fabric. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of the fabrics produced in the following embodiments are as follows:

[0026] Abrasion resistance: Referring to GB / T21196-2007 "Determination of Abrasion Resistance of Fabrics Using the Martindale Process" standard, under standard atmospheric pressure (level 3), a YG401 flat abrasion tester was used, with a 250g pressure hammer and 240 particles / cm². 2 Sandpaper, 300 revolutions, was weighed before and after grinding using an analytical balance, and the mass loss rate was calculated.

[0027] Electromagnetic radiation protection performance test method: The shielding effectiveness of the fabrics in the example-comparative examples was tested in the frequency range of 150MHz to 18GHz, according to the measurement method of shielding effectiveness of electromagnetic shielding room in GB / T12190-2021.

[0028] Example 1

[0029] (1) Mix p-aminophenylacetic acid, sodium dihydrogen phosphate, and deionized water at a mass ratio of 15:5:80, and add water at a bath ratio of 1:25 to a volume of 120 g / m³. 2 The cotton fabric was soaked for 10 minutes and then processed with a padding machine to remove excess water while maintaining a padding rate of 85%. The fabric was then soaked and rubbed twice and then baked at 100°C for 10 minutes to obtain the pretreated fabric.

[0030] (2) Mix 1 kg of radiation shielding filler with 15 L of 5% p-aminophenyltrimethoxysilane solution. The solvent of the silane coupling agent solution is obtained by mixing water and ethanol in a mass ratio of 9:1. After stirring for 30 min, filter to obtain modified radiation shielding filler.

[0031] (3) Mix carbon nanotubes, 1.0 mol / L hydrochloric acid, and aniline in a ratio of 8 g: 160 mL: 3 g. Immerse the pretreated fabric in the mixture at a bath ratio of 1:25. Add 1% of ammonium persulfate by weight. React at 10°C for 4 h under a nitrogen atmosphere, and then at room temperature for 20 h. Remove the fabric and wash it with 1.0 mol / L hydrochloric acid until no SO4 is detected by BaCl2 solution. 2- Then rinse with acetone for 5 minutes and vacuum dry at 40°C for 12 hours to obtain the shielding layer;

[0032] (4) The wear-resistant layer is placed in a pretreatment solution with a bath ratio of 1:10 and pre-shrinked at 50°C for 30 minutes before being removed; then it is pre-shaped at 180°C to obtain the pretreated wear-resistant layer; the pretreatment solution is prepared by the following method: 30 parts by weight of hydrogen peroxide and 10 parts by weight of sodium gluconate are added to 100 parts by weight of water and stirred evenly to obtain the pretreatment solution; the mass ratio of nylon fiber to polyester fiber in the wear-resistant layer is 20:10;

[0033] (5) The abrasion-resistant layer and the shielding layer are pre-treated and sewn together to obtain the fabric;

[0034] (6) Graphene nanopowder and molybdenum disulfide nanopowder were mixed at a mass ratio of 5:1 to obtain filler; 1 kg of filler and 15 L of 5% methacryloyloxymethyltrimethoxysilane solution were mixed. The solvent of the silane coupling agent solution was obtained by mixing water and ethanol at a mass ratio of 9:1. After stirring for 30 min, the mixture was filtered to obtain modified filler.

[0035] (7) By weight, add 20 parts methacrylic acid, 5 parts modified filler, and 10 parts hydroxyethyl methacrylate to 20 parts isopropanol. After mixing evenly, add 1% ammonium persulfate by weight. React at 80℃ for 30 min, then coat it onto one side of the abrasion-resistant layer of the fabric. After baking at 140℃ for 30 min, coat it again and bake at 140℃ for 30 min. The coating amount each time is 12 g / m². 2 .

[0036] Example 2

[0037] (1) Mix 3-aminophenylacetic acid, sodium dihydrogen phosphate, and deionized water at a mass ratio of 15:5:80, and add water at a bath ratio of 1:25 to a volume of 120 g / m³. 2 The cotton fabric was soaked for 15 minutes and then processed with a padding machine to remove excess water while maintaining a padding rate of 85%. The fabric was then soaked and rubbed twice and then baked at 100°C for 10 minutes to obtain the pretreated fabric.

[0038] (2) Mix 1 kg of radiation shielding filler with 15 L of 5% p-aminophenyltrimethoxysilane solution. The solvent of the silane coupling agent solution is obtained by mixing water and ethanol in a mass ratio of 9:1. After stirring for 30 min, filter to obtain modified radiation shielding filler.

[0039] (3) Mix graphene, 1.0 mol / L hydrochloric acid, and aniline in a ratio of 11 g: 160 mL: 4 g, and immerse the pretreated fabric in the mixture at a bath ratio of 1:25. Add 1% of the total mass of ammonium persulfate, and react at 10°C for 4 h under a nitrogen atmosphere, then react at room temperature for 20 h. Remove the fabric and wash it with 1.0 mol / L hydrochloric acid until no SO4 is detected by BaCl2 solution. 2-Then rinse with acetone for 5 minutes and vacuum dry at 40°C for 12 hours to obtain the shielding layer;

[0040] (4) The wear-resistant layer is placed in a pretreatment solution with a bath ratio of 1:15 and pre-shrinked at 55°C for 35 minutes before being removed; then it is pre-shaped at 190°C to obtain the pretreated wear-resistant layer; the pretreatment solution is prepared by the following method: by weight, 35 parts of hydrogen peroxide and 15 parts of sodium gluconate are added to 150 parts of water and stirred evenly to obtain the pretreatment solution; the mass ratio of nylon fiber to polyester fiber in the wear-resistant layer is 20:15;

[0041] (5) The abrasion-resistant layer and the shielding layer are pre-treated and sewn together to obtain the fabric;

[0042] (6) Graphene nanopowder and molybdenum disulfide nanopowder were mixed at a mass ratio of 5:1 to obtain filler; 1 kg of filler and 15 L of 5% methacryloyloxymethyltrimethoxysilane solution were mixed. The solvent of the silane coupling agent solution was obtained by mixing water and ethanol at a mass ratio of 9:1. After stirring for 30 min, the mixture was filtered to obtain modified filler.

[0043] (7) By weight, add 30 parts methacrylic acid, 8 parts modified filler, and 12 parts hydroxyethyl methacrylate to 32 parts isobutanol. After mixing evenly, add 1% ammonium persulfate by weight. React at 80℃ for 30 min, then coat it onto one side of the abrasion-resistant layer of the fabric. Bake at 140℃ for 30 min, then coat it again and bake at 140℃ for 30 min. The coating amount each time is 12 g / m². 2 .

[0044] Example 3

[0045] (1) Mix 2-(4-aminophenyl)propionic acid, sodium dihydrogen phosphate, and deionized water at a mass ratio of 15:5:80, and add a bath solution of 120 g / m³ at a bath ratio of 1:30. 2 The cotton fabric was soaked for 20 minutes and then processed with a padding machine to remove excess water while maintaining a padding rate of 85%. The fabric was then soaked and rubbed twice and then baked at 100°C for 10 minutes to obtain the pretreated fabric.

[0046] (2) Mix 1 kg of radiation shielding filler with 15 L of 5% p-aminophenyltrimethoxysilane solution. The solvent of the silane coupling agent solution is obtained by mixing water and ethanol in a mass ratio of 9:1. After stirring for 30 min, filter to obtain modified radiation shielding filler.

[0047] (3) Mix the radiation-shielding filler, 1.0 mol / L hydrochloric acid, and aniline in a ratio of 15 g: 160 mL: 5 g. Immerse the pretreated fabric in the mixture at a bath ratio of 1:25. Add 1% of the total mass of ammonium persulfate. React at 15°C for 4 h under a nitrogen atmosphere, and then react at room temperature for 20 h. Remove the fabric and wash it with 1.0 mol / L hydrochloric acid until no SO4 is detected by BaCl2 solution. 2- Then rinse with acetone for 5 minutes and vacuum dry at 40°C for 12 hours to obtain the shielding layer; the mass ratio of graphene to carbon nanotubes in the radiation shielding filler is 1:1;

[0048] (4) The wear-resistant layer is placed in a pretreatment solution with a bath ratio of 1:20 and pre-shrinked at 60°C for 40 minutes before being removed; then it is pre-shaped at 200°C to obtain the pretreated wear-resistant layer; the pretreatment solution is prepared by the following method: by weight, 40 parts of hydrogen peroxide and 20 parts of sodium gluconate are added to 200 parts of water and stirred evenly to obtain the pretreatment solution; the mass ratio of nylon fiber to polyester fiber in the wear-resistant layer is 20:20;

[0049] (5) The abrasion-resistant layer and the shielding layer are pre-treated and sewn together to obtain the fabric;

[0050] (6) Graphene nanopowder and molybdenum disulfide nanopowder were mixed at a mass ratio of 5:1 to obtain filler; 1 kg of filler and 15 L of 5% methacryloyloxymethyltrimethoxysilane solution were mixed. The solvent of the silane coupling agent solution was obtained by mixing water and ethanol at a mass ratio of 9:1. After stirring for 30 min, the mixture was filtered to obtain modified filler.

[0051] (7) By weight, add 40 parts methacrylic acid, 10 parts modified filler, and 15 parts hydroxyethyl methacrylate to 45 parts isopropanol. After mixing evenly, add 1% ammonium persulfate by weight. React at 80℃ for 30 min, then coat it onto one side of the abrasion-resistant layer of the fabric. After baking at 140℃ for 30 min, coat it again and bake at 140℃ for 30 min. The coating amount each time is 12 g / m². 2 .

[0052] Comparative Example 1

[0053] The difference between Comparative Example 1 and Example 1 is that step (1) is omitted, while the remaining steps are the same as in Example 1.

[0054] Comparative Example 2

[0055] The difference between Comparative Example 2 and Example 1 is that the surface modification treatment of the comparative radiation-shielding filler is not performed; the remaining steps are the same as in Example 1.

[0056] Comparative Example 3

[0057] The difference between Comparative Example 3 and Example 1 is that no radiation-shielding filler is added; the remaining steps are the same as in Example 1.

[0058] Comparative Example 4

[0059] The difference between Comparative Example 4 and Example 1 is that graphene nanopowder is not added to the coating layer, while the other steps are the same as in Example 1.

[0060] Comparative Example 5

[0061] The difference between Comparative Example 5 and Example 1 is that molybdenum disulfide nanopowder is not added to the coating layer; the other steps are the same as in Example 1.

[0062] Comparative Example 6

[0063] The difference between Comparative Example 6 and Example 1 is that the wear-resistant layer is not pretreated or modified; the remaining steps are the same as in Example 1.

[0064] Comparative Example 7

[0065] The difference between Comparative Example 7 and Example 1 is that no surface modification treatment is performed on the graphene nanopowder and molybdenum disulfide nanopowder; the remaining steps are the same as in Example 1.

[0066] Example of effect

[0067] Table 1 below shows the performance analysis results of the fabrics using Examples 1 to 3 and Comparative Examples 1 to 7 of the present invention.

[0068] Table 1

[0069]

[0070] A comparison of experimental data from the examples and comparative examples reveals that the shielding layer of the present invention uses cotton fabric as the base material. It is pre-treated to load a large number of aniline molecular structures onto its surface, allowing it to polymerize with radiation-shielding fillers carrying aniline groups to form polyaniline. Simultaneously, the radiation-shielding fillers are deposited on the fiber surface and in the gaps between fibers. Polyaniline contains a large number of benzene ring structures, providing a certain degree of electromagnetic shielding. It does not undergo radiation cross-linking or chemical degradation reactions after being subjected to high-energy radiation. Working together with the radiation-shielding fillers, it enhances the electromagnetic shielding effect of the fabric. Furthermore, the fillers and fabric are connected by chemical bonds, and the fabric is subsequently sewn together, firmly locking the fillers onto the surface of the cotton fabric. This prevents the fabric from easily falling off after multiple washes, thus achieving a long-term shielding effect. The wear-resistant layer of this invention is constructed from fibers with excellent wear resistance, which initially improves the wear resistance of the fabric. The coating layer is chemically bonded to the wear-resistant layer, reducing the damaging effect of washing. Graphene and molybdenum disulfide are added to the coating layer. After surface modification, both have high dispersibility, fully utilizing their rigidity and lubricity to effectively improve the wear resistance of the coating layer. At the same time, they can also participate in the polymerization of coating monomers to form a flexible alkyl long-chain structure. When the fabric fibers rub against other objects, the flexible alkyl long chains on the fabric surface undergo compression, deformation, and other movements, thereby reducing the friction coefficient of the fabric fibers, preventing fabric wear, and further improving the wear resistance of the fabric.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A wear-resistant and radiation-proof functional fabric, comprising a shielding layer and a wear-resistant layer, wherein, The wear-resistant layer has a coating layer on its surface, characterized in that the shielding layer is prepared by: (1) Mix the pretreatment agent, sodium dihydrogen phosphate, and deionized water at a mass ratio of 15:5:80, soak the cotton fabric at a bath ratio of 1:20~30 for 10~20 minutes, and use a padding machine to treat the soaked cotton fabric to remove excess water, while maintaining a padding rate of 80~85%, perform two dips and two paddings, and then bake at 100℃ for 10 minutes to obtain the pretreated fabric; the pretreatment agent is at least one of p-aminophenylacetic acid, 3-aminophenylacetic acid, 2-(4-aminophenyl)propionic acid, and 4-amino-2-methylphenylacetic acid; (2) Mix radiation-proof filler, 1.0 mol / L hydrochloric acid, and aniline in a ratio of 8-15 g: 160 mL: 3-5 g. Soak the pretreated fabric in the mixture at a bath ratio of 1:20-30. Add 1% of the total mass of ammonium persulfate. React at 5-15°C for 4 hours under a nitrogen atmosphere, and then react at room temperature for 20 hours. Remove the fabric and wash it with 1.0 mol / L hydrochloric acid until no SO4 is detected by BaCl2 solution. 2- Then rinse with acetone for 3-5 minutes and vacuum dry at 40°C for 12 hours to obtain the shielding layer; The coating layer comprises, by weight, 20-45 parts solvent, 20-40 parts (meth)acrylic acid, 5-10 parts filler, and 10-15 parts hydroxyethyl methacrylate; the filler is graphene nanoparticles and molybdenum disulfide nanoparticles, both of which are surface-modified with methacryloyloxymethyltrimethoxysilane.

2. The wear-resistant and radiation-proof functional fabric according to claim 1, characterized in that, The cotton fabric in step (1) has a weight of 100~120g / m². 2 .

3. The wear-resistant and radiation-proof functional fabric according to claim 1, characterized in that, The radiation-shielding filler in step (2) includes at least one of nano tin dioxide, nano cerium dioxide, nano erbium oxide, nano tin oxide antimony ATO, boron nitride nanosheets, boron nitride whiskers, graphene, carbon nanotubes, and carbon black.

4. The wear-resistant and radiation-proof functional fabric according to claim 1, characterized in that, The radiation-shielding filler described in step (2) is also surface-modified with p-aminophenyltrimethoxysilane.

5. The wear-resistant and radiation-proof functional fabric according to claim 1, characterized in that, The mass ratio of nylon fiber to polyester fiber in the wear-resistant layer is 10~20:10~20.

6. The wear-resistant and radiation-proof functional fabric according to claim 1, characterized in that, The solvent is at least one of butanol, isopropanol, n-propanol, isobutanol, sec-butanol, tert-butanol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol monobutyl ether.

7. The method for preparing a wear-resistant and radiation-resistant functional fabric according to claim 1, characterized in that, The preparation steps include the following: S1: The abrasion-resistant layer is pretreated and then sewn together with the shielding layer to obtain the fabric; S2: Add (meth)acrylic acid, filler, and hydroxyethyl methacrylate to the solvent, add an initiator, react at 50-120℃ for 30 minutes, then coat it onto one side of the abrasion-resistant layer of the fabric, bake at 140℃ for 30 minutes, coat it again, and bake at 140℃ for 30 minutes. Each coating amount is 10~15g / m². 2 .

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