Sun-proof breathable garment material and preparation method thereof

Abstract

The invention discloses a sunscreen breathable garment fabric and a preparation method thereof, and relates to the technical field of composite fabric paints.The sunscreen breathable garment fabric comprises base cloth and a functional layer arranged on the surface of the base cloth, the functional layer is obtained after the surface of the base cloth is coated with paint and dried, and the paint comprises organic silicon modified acrylate, fluorocarbon resin, filler and a cross-linking agent. The organic silicon modified acrylate and the fluorocarbon resin are compounded to form a functional layer which can effectively resist ultraviolet rays in an external environment, so that the water resistance, the wear resistance and the adhesive force of the functional layer are improved, and the softness and the elasticity of the functional layer are improved; the cross-linking agent is added, so that the mechanical property and the water resistance of the functional layer are improved. The filler is compounded from nano titanium dioxide and nano titanium oxide, so that UVB / UVA can be reflected, UV scattering is enhanced, and a good physical sunscreen barrier is formed; and the acrylic monomer containing the cinnamyl oxygen group is used for carrying out copolymerization modification on the filler, and broad-spectrum, lasting and efficient ultraviolet protection is realized through a multi-synergistic mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of composite fabric coatings, and specifically to a sunscreen breathable clothing fabric and a preparation method thereof. Background Art

[0002] With the rapid economic development and the continuous improvement of people's living standards, people's outdoor life and work projects are becoming more and more diverse, and the demand for clothing fabrics is also increasing. Fabrics are increasingly appearing in functional application scenarios such as outdoor sports, children's clothing, and occupational protection. However, when exposed to the outdoor environment for a long time, affected by the radiation of UVB (280–315nm) and UVA (315–400nm), the risk of melanoma and non-melanoma skin cancer increases; and UVA has strong penetration, which can cause collagen degradation, leading to wrinkles and age spots. Traditional sunscreen methods such as sunscreen have incomplete coverage, are prone to failure, and have disadvantages such as chemical sunscreen pollution and high costs. The UPF of ordinary clothes is generally only 5-20, and thick clothes are more stuffy, so sunscreen fabrics fill the protection gap. Therefore, we propose a sunscreen breathable clothing fabric and a preparation method thereof. Summary of the Invention

[0003] The purpose of the present invention is to provide a sunscreen breathable clothing fabric and a preparation method thereof to solve the problems raised in the above background art.

[0004] To solve the above technical problems, the present invention provides the following technical solutions: A sunscreen breathable clothing fabric includes a base fabric and a functional layer disposed on the surface of the base fabric, and the functional layer is obtained by coating a coating on the surface of the base fabric and drying.

[0005] Further, the base fabric is a woven fabric or a non-woven fabric, and the specific material is one or more of polyester, nylon, spandex, cotton, and linen.

[0006] Further, the coating includes the following mass components: 40-50 parts of organosilicon-modified acrylate, 15-20 parts of fluorocarbon resin, 10-35 parts of filler, 1-3 parts of crosslinking agent, and 0.5-10 parts of auxiliary agent.

[0007] Further, the solid content of the coating is 30% - 50%.

[0008] Further, the filler is one or more mixtures of nano-titanium dioxide, nano-zinc oxide, fumed silica, graphene, boron nitride, microcapsules, and nano-silver.

[0009] Further, the crosslinking agent is one or a mixture of two of aziridine and silane coupling agent.

[0010] Further, the auxiliary agent includes one or a mixture of more than one of ultraviolet absorbers, wetting and dispersing agents, thickeners, and leveling agents;

[0011] The ultraviolet absorber is one or a mixture of more than one of benzotriazoles, benzophenones, and triazines; such as a mixture of one or more of Tinuvin326, Tinuvin328, Hostavin3206, CyasorbUV-531, and ADKSTABLA-46;

[0012] The wetting and dispersing agent is anionic or nonionic, such as a mixture of one or more of BYK-190, BYK-194, TEGODispers750W, TritonX-100, and EFKA4580;

[0013] The leveling agent is one or more of silicone-based, fluorocarbon-modified, and acrylate-based; such as a mixture of one or more of BYK-333, BYK-381, TEGOFlow425, and EFKA-3777;

[0014] The thickener is a mixture of one or more of hydroxyethyl cellulose, polyurethane thickeners, polyacrylate thickeners, and fumed silica.

[0015] A preparation method of a sunscreen breathable clothing fabric includes the following processes:

[0016] Mix fluorocarbon resin and organosilicon-modified acrylate, add filler, disperse at high speed, add crosslinking agent and auxiliary agent, and mix evenly to obtain a coating;

[0017] Take the coating obtained in the previous step, coat it on the surface of the base fabric, and dry it to form a functional layer to obtain the fabric.

[0018] Further, the coating is prepared by the following process:

[0019] Take fluorocarbon resin and organosilicon-modified acrylate, stir at a low speed of 300 - 500 rpm for 5 - 10 min to fully mix the resin base material;

[0020] Slowly add the filler, gradually increase the stirring speed to 2000 - 2500 rpm, and continuously disperse for 15 - 20 min to disperse the filler and avoid agglomeration;

[0021] Reduce the speed to 800 - 1000 rpm, add the crosslinking agent and auxiliary agent in sequence, and mix for 10 - 15 min until the system is homogeneous;

[0022] According to the coating requirement, add a diluent to adjust the viscosity of the coating to 2000 - 4000 cP (25 °C).

[0023] Further, the diluent is one or a mixture of two of deionized water and ethylene glycol monobutyl ether.

[0024] Further, the high-speed dispersion process needs to control the temperature ≤ 40 °C throughout the process to avoid demulsification of the resin base material.

[0025] Further, the coating process is as follows: the wet film thickness is controlled at 10 - 15 μm.

[0026] Further, the environmental humidity of the coating process needs to be controlled at 50 ± 5%, to avoid defects on the surface of the functional layer.

[0027] Further, drying is carried out in stages, and the specific process is as follows: at a temperature of 80 - 100 °C, pre-dry for 2 - 3 min to remove most of the solvent; at a temperature of 120 - 150 °C, cure for 3 - 5 min to promote the complete cross-linking reaction.

[0028] Further, the filler is 15 - 20 parts of nano-titanium dioxide and 10 - 15 parts of nano-zinc oxide.

[0029] In the above technical solution, the fluorocarbon resin has good comprehensive properties, such as weather resistance and low surface energy, which enables it to be applied to the preparation of outdoor textiles. The formed functional layer can protect the base fabric and effectively resist ultraviolet rays, wind and rain, pollution, etc. in the external environment, and is not easily damaged by the environment, improving the service life and aesthetics of the fabric. The compounding of organosilicon-modified acrylate and fluorocarbon resin can improve the water resistance, abrasion resistance and adhesion of the functional layer, and improve the softness and elasticity of the functional layer, which helps to overall improve the wearing experience. The addition of the cross-linking agent can improve the mechanical properties and water resistance of the functional layer. The filler can be selected as a compound of nano-titanium dioxide and nano-titanium oxide, which can reflect UVB / UVA, enhance UV scattering, and form a good physical sunscreen barrier.

[0030] The coating is applied to the surface of the base fabric and dried and cured to form a functional layer. The filling of the filler in the fiber gaps of the base fabric and the film formation of the resin base material on the surface of the base fabric reduce the air penetration channels, which will affect the breathability of the fabric produced; 5% - 8% of a pore-forming agent can be added according to requirements. For example, ammonium bicarbonate can decompose during the drying process to form micropores, restoring the breathability of the fabric while maintaining the waterproof performance.

[0031] Further, the filler is surface-modified, and the specific process is as follows:

[0032] Mix methyl methacrylate, butyl acrylate, acrylic acid, cinnamoyloxyethyl methacrylate, dodecafluoroheptyl methacrylate and the filler, heat to 45 - 55 °C, stir and disperse to obtain an oil phase;

[0033] Add sodium bicarbonate and an emulsifier to deionized water to obtain an aqueous phase;

[0034] Under stirring conditions, the oil phase was slowly added to the water phase and the addition was completed within 30 min; stirring was carried out for 20 - 30 min, and then ultrasonic emulsification was carried out at 0 - 4 °C for 15 - 20 min to obtain a pre-emulsion;

[0035] The pre-emulsion was heated to 50 - 60 °C, and potassium persulfate was slowly added under stirring conditions and the addition was completed within 30 - 60 min, and then the reaction was carried out under insulation for 240 - 300 min to obtain a modified filler.

[0036] Furthermore, the modified filler comprises the following mass components: 1.5 - 3.5 parts of methyl methacrylate, 1 - 2.3 parts of butyl acrylate, 0.5 - 1.2 parts of acrylic acid, 3 - 7 parts of cinnamoyloxyethyl methacrylate, 1 - 2 parts of dodecafluoroheptyl methacrylate, 2 - 5 parts of filler, 0.10 - 0.15 parts of sodium bicarbonate, 0.06 - 0.35 parts of emulsifier, 0.12 - 0.46 parts of potassium persulfate, 24 - 50 parts of deionized water.

[0037] Furthermore, the ultrasonic power is 300 W.

[0038] Furthermore, before use, the filler was subjected to coupling modification treatment, and the specific process is as follows:

[0039] Ethanol, deionized water and γ-methacryloxypropyltrimethoxysilane were mixed, the pH was adjusted to 4.5 - 5.5, and stirring was carried out at 60 - 70 °C for 15 - 20 min to obtain a silane hydrolysis solution;

[0040] The filler was taken, and the silane hydrolysis solution was added under stirring conditions, and stirring was carried out at 90 - 110 °C for 15 - 30 min to obtain a coupling-modified filler.

[0041] Furthermore, the mass ratio of ethanol, deionized water and γ-methacryloxypropyltrimethoxysilane is (80 - 90):(10 - 20):(3 - 10);

[0042] Furthermore, the mass ratio of the filler to the silane hydrolysis solution is 10:(5 - 10).

[0043] In the above technical solution, the filler is subjected to coupling modification treatment. Its surface hydroxyl groups can react with the silicon-oxygen bonds in γ-methacryloxypropyltrimethoxysilane to form an organic layer on the surface of the nano-filler, increasing its lipophilicity and reducing the surface free energy. This helps the filler to aggregate and disperse into the oily acrylic monomer during the ultrasonic emulsification process, thereby forming an acrylic monomer containing the filler, i.e., the oil phase. After adding the initiator potassium persulfate, the unsaturated bonds on the surface of the coupled and modified filler participate in the polymerization of the acrylic monomer, and the filler is coated on the copolymer network formed by the acrylic monomer to form a polyacrylic acid modified filler, denoted as modified acrylic acid, which can effectively prevent the de-embedding of the filler, improve the water resistance of the functional layer, and extend its service life.

[0044] The acrylic monomer contains cinnamoyloxyethyl methacrylate, which has a benzene ring conjugated with the α,β-unsaturated carbonyl (C=C-C=O) system and can absorb UVB (280–320 nm) and part of UVA (320 - 400 nm), enhancing the absorption of long-wave ultraviolet rays. When irradiated with ultraviolet light, it converts the ultraviolet light into harmless heat energy or low-energy fluorescence through energy conversion, thereby reducing the damage caused by ultraviolet rays. At the same time, the physical shielding effect of the filler can also reduce the degradation of the filler by ultraviolet rays and extend its service life.

[0045] When cinnamoyloxyethyl methacrylate copolymerizes with other acrylic monomers and is loaded on the surface of the filler, a core-shell structure is formed, improving the dispersibility of the filler in the resin matrix and enhancing the ultraviolet absorption efficiency of the prepared functional layer. The acrylic monomer contains the hydrophilic monomer acrylic acid, which can participate in the crosslinking of the resin matrix and the crosslinking agent. After crosslinking, a network structure is formed, extending the action path of the ultraviolet-resistant filler to ultraviolet rays, increasing the shielding rate of the functional layer to ultraviolet rays, and improving the crosslinking degree of the functional layer. The limitation of the filler also helps to improve the water resistance of the fabric and extend its service life. Methacrylic acid dodecafluorooctyl ester can reduce the surface energy of the functional layer and reduce water blockage. The modified filler and the ultraviolet absorber work together with complementary mechanisms, achieving broad-spectrum, long-lasting, and efficient ultraviolet protection through multiple synergistic mechanisms; and it can balance the heaviness brought by the filler and maintain the softness of the fabric.

[0046] Furthermore, a breathable layer is provided between the functional layer and the base fabric to improve the breathability of the fabric;

[0047] The breathable layer is prepared by the following process:

[0048] Take fluorocarbon resin and organosilicon-modified acrylate, stir for 5 - 10 min to fully mix the resin matrix; add a pore-forming agent and an auxiliary agent to obtain a bottom coating; according to the coating requirements, add a diluent to adjust the viscosity of the coating to 1500 - 2000 cP (25 °C);

[0049] Apply the primer coating on the surface of the base fabric and dry it to form a breathable layer.

[0050] Furthermore, the wet film thickness of the primer coating is 3 - 6 μm.

[0051] Furthermore, the drying process is as follows: pre - bake for 2 - 3 min at a temperature of 80 - 100 °C; cure for 3 - 5 min at a temperature of 120 - 150 °C.

[0052] Furthermore, the primer coating comprises the following mass components: 55 - 65 parts of silicone - modified acrylate, 5 - 10 parts of fluorocarbon resin, 6 - 10 parts of pore - forming agent, 0.5 - 1.0 part of additive;

[0053] The pore - forming agent is a mixture of ammonium bicarbonate and polyvinyl alcohol, and the mass ratio is 8:3. Detailed implementation mode

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0055] In the following detailed implementation mode,

[0056] The base fabric is a polyester - nylon - cotton woven plain fabric, and the mass ratio of polyester - nylon - cotton is 45:15:40, the yarn count is 75D*32, the fabric density is 178×114, and the gram weight is 170 g / m 2 ;

[0057] Fluorocarbon resin: polytetrafluoroethylene emulsion, CP - C, sourced from DuPont;

[0058] Silicone - modified acrylate: Finish CT96E, sourced from Wacker Chemie;

[0059] Cinnamoyloxyethyl methacrylate CAS No: 116107 - 78 - 9;

[0060] The emulsifier is DNS - 86; the cross - linker is aziridine;

[0061] The ultraviolet absorber is Tinuvin 326 and Cyasorb UV - 531, and the mass ratio is 2:1;

[0062] The wetting and dispersing agent is BYK - 190; the leveling agent is BYK - 333;

[0063] Nano-titanium dioxide: particle size 10 nm, DK-TiO2-A10; nano-zinc oxide: particle size 30 nm, DK-ZnO-30, sourced from Beijing Decodaojin Technology Co., Ltd.;

[0064] Polyvinyl alcohol: PVA-1788, dissolved in water at 95 °C to prepare a polyvinyl alcohol solution with a solid content of 40%. The following polyvinyl alcohol is added in the form of a solution.

[0065] Example 1: A preparation method of a sunscreen and breathable clothing fabric, comprising the following processes:

[0066] Step 1: Mix ethanol, deionized water, and γ-methacryloxypropyltrimethoxysilane, adjust the pH to 4.5, place it at 60 °C and stir for 15 min to obtain a silane hydrolysis solution; take the filler and add it to the silane hydrolysis solution under stirring, and stir at 90 °C for 15 min to obtain a coupling-modified filler; the mass ratio of ethanol, deionized water, and γ-methacryloxypropyltrimethoxysilane is 80:20:3; the mass ratio of the filler to the silane hydrolysis solution is 10:5; the filler is 15 parts of nano-titanium dioxide and 10 parts of nano-zinc oxide;

[0067] Mix methyl methacrylate, butyl acrylate, acrylic acid, cinnamoyloxyethyl methacrylate, dodecafluoroheptyl methacrylate, and the coupling-modified filler, heat to 45 °C, stir and disperse to obtain an oil phase; add sodium bicarbonate and emulsifier to deionized water to obtain an aqueous phase; under stirring conditions, slowly add the oil phase to the aqueous phase and finish adding it in 30 min; stir for 20 min, place it at 4 °C and perform ultrasonic emulsification at 300 W for 15 min to obtain a pre-emulsion;

[0068] Heat the pre-emulsion to 50 °C, and slowly add potassium persulfate under stirring conditions and finish adding it in 60 min, then keep the temperature for reaction for 300 min to obtain a modified filler; the modified filler includes the following mass components: 3.5 parts of methyl methacrylate, 2.3 parts of butyl acrylate, 1.2 parts of acrylic acid, 3 parts of cinnamoyloxyethyl methacrylate, 2 parts of the coupling-modified filler, 1 part of dodecafluoroheptyl methacrylate, 0.10 part of sodium bicarbonate, 0.06 part of emulsifier, 0.12 part of potassium persulfate, and 24 parts of deionized water;

[0069] Step 2: Take fluorocarbon resin and organosilicon-modified acrylate, and stir them at a low speed of 300 rpm for 10 min; slowly add the modified filler, gradually increase the stirring speed to 2000 rpm, and continue to disperse for 20 min. Then add the crosslinking agent and additives in sequence and mix for 10 min; according to the coating requirements, add deionized water as a diluent to adjust the viscosity of the coating to 2000 cP (25 °C) to obtain the coating; the coating includes the following mass components: 50 parts of organosilicon-modified acrylate, 15 parts of fluorocarbon resin, 10 parts of modified filler (dry weight), 1 part of crosslinking agent, 4 parts of pore-forming agent ammonium bicarbonate, and 1.1 parts of additives; the additives include 0.5 part of ultraviolet absorber, 0.5 part of wetting and dispersing agent, and 0.1 part of leveling agent;

[0070] Take the coating obtained in the previous step and coat it on the surface of the base fabric, and control the wet film thickness to 10 μm; dry it, and the process is as follows: pre-dry at 80 °C for 3 min; cure at 120 °C for 5 min; form a functional layer to obtain the fabric.

[0071] Example 2: A preparation method of a sunscreen and breathable clothing fabric includes the following processes:

[0072] Step 1: Mix ethanol, deionized water, and γ-methacryloxypropyltrimethoxysilane, adjust the pH to 5, and place it at 65 °C and stir for 18 min to obtain a silane hydrolysis solution; take the filler and add it to the silane hydrolysis solution under stirring, and stir at 100 °C for 20 min to obtain the coupling-modified filler; the mass ratio of ethanol, deionized water, and γ-methacryloxypropyltrimethoxysilane is 85:15:6; the mass ratio of the filler to the silane hydrolysis solution is 10:8; the filler is 18 parts of nano-titanium dioxide and 12 parts of nano-zinc oxide;

[0073] Mix methyl methacrylate, butyl acrylate, acrylic acid, cinnamoyloxyethyl methacrylate, dodecafluoroheptyl methacrylate, and the coupling-modified filler, heat to 50 °C, and stir and disperse to obtain an oil phase; add sodium bicarbonate and an emulsifier to deionized water to obtain an aqueous phase; under stirring conditions, slowly add the oil phase to the aqueous phase and finish adding it in 30 min; stir for 25 min, place it at 2 °C, and perform ultrasonic emulsification at 300 W for 18 min to obtain a pre-emulsion;

[0074] Heat the pre-emulsion to 55 °C, and slowly add potassium persulfate under stirring and finish adding it in 45 min, and then keep the temperature for reaction for 270 min to obtain the modified filler; the modified filler includes the following mass components: 2.5 parts of methyl methacrylate, 1.7 parts of butyl acrylate, 0.8 part of acrylic acid, 5 parts of cinnamoyloxyethyl methacrylate, 3.5 parts of the coupling-modified filler, 1.5 parts of dodecafluoroheptyl methacrylate, 0.12 part of sodium bicarbonate, 0.20 part of emulsifier, 0.30 part of potassium persulfate, and 37 parts of deionized water;

[0075] Step 2: Take fluorocarbon resin and organosilicon-modified acrylate, and stir them at a low speed of 400 rpm for 8 min; slowly add the modified filler, gradually increase the stirring speed to 2200 rpm, and continue to disperse for 18 min; reduce the speed to 900 rpm, add the crosslinking agent and additives in sequence, and mix for 12 min; according to the coating requirement, add diluents deionized water and ethylene glycol monobutyl ether to adjust the viscosity of the coating to 2000 cP (25 °C) to obtain the coating; the coating includes the following mass components: 45 parts of organosilicon-modified acrylate, 18 parts of fluorocarbon resin, 22 parts of modified filler (dry weight), 2 parts of crosslinking agent, 5.8 parts of pore-forming agent ammonium bicarbonate, 3.3 parts of additives; the additives include 1.8 parts of ultraviolet absorber, 1.2 parts of wetting and dispersing agent, 0.3 part of leveling agent;

[0076] Take the coating obtained in the previous step, coat it on the surface of the base fabric, and control the wet film thickness to 12 μm; dry it, and the process is: pre-dry at 90 °C for 2.5 min; cure at 135 °C for 4 min; form a functional layer to obtain the fabric.

[0077] Example 3: A preparation method of a sunscreen and breathable clothing fabric includes the following processes:

[0078] Step 1: Mix ethanol, deionized water and γ-methacryloxypropyltrimethoxysilane, adjust the pH to 5.5, place it at 70 °C and stir for 20 min to obtain a silane hydrolysis solution; take the filler and add it to the silane hydrolysis solution under stirring, and stir at 110 °C for 30 min to obtain the coupling-modified filler; the mass ratio of ethanol, deionized water and γ-methacryloxypropyltrimethoxysilane is 90:10:10; the mass ratio of the filler to the silane hydrolysis solution is 1:1; the filler is 20 parts of nano-titanium dioxide and 15 parts of nano-zinc oxide;

[0079] Mix methyl methacrylate, butyl acrylate, acrylic acid, cinnamoyloxyethyl methacrylate, dodecafluoroheptyl methacrylate and the coupling-modified filler, heat to 55 °C, stir and disperse to obtain an oil phase; add sodium bicarbonate and emulsifier to deionized water to obtain an aqueous phase; under stirring conditions, slowly add the oil phase to the aqueous phase and finish adding it in 30 min; stir for 30 min, place it at 0 °C and carry out ultrasonic emulsification at 300 W for 20 min to obtain a pre-emulsion;

[0080] Heat the pre-emulsion to 60°C. Under stirring, slowly add potassium persulfate and finish adding it within 30 min. Then, keep the temperature for reaction for 240 min to obtain the modified filler. The modified filler includes the following mass components: 1.5 parts of methyl methacrylate, 1 part of butyl acrylate, 0.5 part of acrylic acid, 7 parts of cinnamoyloxyethyl methacrylate, 5 parts of coupling-modified filler, 2 parts of dodecafluoroheptyl methacrylate, 0.15 part of sodium bicarbonate, 0.35 part of emulsifier, 0.46 part of potassium persulfate, and 50 parts of deionized water.

[0081] Take fluorocarbon resin and organosilicon-modified acrylate, and stir them at a low speed of 500 rpm for 5 min. Slowly add the modified filler, gradually increase the stirring speed to 2500 rpm, and continue dispersing for 15 min. Reduce the speed to 1000 rpm, and successively add the crosslinking agent and additives, and mix for 15 min. According to the coating requirements, add the diluents deionized water and ethylene glycol monobutyl ether to adjust the viscosity of the coating to 2000 cP (25°C) to obtain the coating. The coating includes the following mass components: 40 parts of organosilicon-modified acrylate, 20 parts of fluorocarbon resin, 35 parts of modified filler (dry weight), 3 parts of crosslinking agent, 8.2 parts of pore-forming agent ammonium bicarbonate, and 5.5 parts of additives. The additives include 3 parts of ultraviolet absorber, 2 parts of wetting and dispersing agent, and 0.5 part of leveling agent.

[0082] Step 2: Take fluorocarbon resin and organosilicon-modified acrylate, and stir for 8 min to fully mix the resin base materials. Add polyvinyl alcohol, ammonium bicarbonate, and additives to obtain the base coating. According to the coating requirements, add diluents to adjust the viscosity of the coating to 1500 cP (25°C). Coat the base coating on the surface of the base fabric and dry it to form a breathable layer. The base coating includes the following mass components: 60 parts of organosilicon-modified acrylate, 5 parts of fluorocarbon resin, 8 parts of pore-forming agent, and 1.0 part of additives (0.8 part of wetting and dispersing agent + 0.2 part of leveling agent). The pore-forming agent is a mixture of ammonium bicarbonate and polyvinyl alcohol with a mass ratio of 8:3. The wet film thickness of the base coating is 5 μm. The drying process is as follows: pre-bake at 80°C for 23 min; cure at 130°C for 3 min.

[0083] Take the coating obtained in Step 1, coat it on the surface of the breathable layer, and control the wet film thickness at 5 μm. Dry it. The process is as follows: pre-bake at 100°C for 2 min; cure at 150°C for 3 min. Form a functional layer to obtain the fabric.

[0084] Comparative Example 1: A preparation method of a sunscreen breathable clothing fabric includes the following process:

[0085] Step 1: Mix methyl methacrylate, butyl acrylate, acrylic acid, cinnamoyloxyethyl methacrylate and filler, heat to 45°C, stir and disperse to obtain an oil phase; add sodium bicarbonate and emulsifier to deionized water to obtain an aqueous phase; under stirring conditions, slowly add the oil phase to the aqueous phase and finish adding it in 30 min; stir for 20 min, place it at 4°C and carry out ultrasonic emulsification at 300 W for 15 min to obtain a pre-emulsion; the filler is 15 parts of nano-titanium dioxide and 10 parts of nano-zinc oxide;

[0086] Heat the pre-emulsion to 50°C, and slowly add potassium persulfate under stirring conditions and finish adding it in 60 min, then keep the temperature for reaction for 300 min to obtain a modified filler; the modified filler includes the following mass components: 3.5 parts of methyl methacrylate, 2.3 parts of butyl acrylate, 1.2 parts of acrylic acid, 3 parts of cinnamoyloxyethyl methacrylate, 2 parts of filler, 0.10 part of sodium bicarbonate, 0.06 part of emulsifier, 0.12 part of potassium persulfate, 24 parts of deionized water;

[0087] Step 2: Take fluorocarbon resin and organosilicon-modified acrylate, stir at a low speed of 300 rpm for 10 min; slowly add the modified filler, gradually increase the stirring speed to 2000 rpm, continuously disperse for 20 min, and sequentially add a crosslinking agent and an auxiliary agent and mix for 10 min; according to the coating requirement, add deionized water as a diluent to adjust the viscosity of the coating to 2000 cP (25°C) to obtain a coating; the coating includes the following mass components: 50 parts of organosilicon-modified acrylate, 15 parts of fluorocarbon resin, 10 parts of modified filler (dry weight), 1 part of crosslinking agent, 1.1 parts of auxiliary agent; the auxiliary agent includes 0.5 part of ultraviolet absorber, 0.5 part of wetting and dispersing agent, 0.1 part of leveling agent;

[0088] Take the coating obtained in the previous step, coat it on the surface of the base fabric, and control the wet film thickness at 10 μm; dry it, and the process is: pre-dry at 80°C for 3 min; cure at 120°C for 5 min; form a functional layer to obtain a fabric.

[0089] Comparative Example 2: A preparation method of a sunscreen and breathable clothing fabric, including the following process:

[0090] Step 1: Disperse the filler in deionized water, add sodium stearate, stir and heat up to 75°C, add concentrated sulfuric acid, and keep the temperature for reaction for 230 min; wash and dry to obtain sodium stearate-modified filler; the ratio of sodium stearate, filler, and deionized water is 10 g:1.8 g:100 mL; the filler is 15 parts of nano-titanium dioxide and 10 parts of nano-zinc oxide;

[0091] Mix methyl methacrylate, butyl acrylate, acrylic acid, and sodium stearate-modified filler, heat to 45°C, stir and disperse to obtain an oil phase; add sodium bicarbonate and emulsifier to deionized water to obtain an aqueous phase; under stirring conditions, slowly add the oil phase to the aqueous phase, and finish adding in 30 min; stir for 20 min, place at 4°C, and carry out ultrasonic emulsification at 300 W for 15 min to obtain a pre-emulsion.

[0092] Heat the pre-emulsion to 50°C, slowly add potassium persulfate under stirring conditions, and finish adding in 60 min, then keep the temperature for reaction for 300 min to obtain the modified filler; the modified filler includes the following mass components: 4 parts of methyl methacrylate, 6 parts of butyl acrylate, 2 parts of acrylic acid, 2 parts of sodium stearate-modified filler, 0.10 part of sodium bicarbonate, 0.06 part of emulsifier, 0.12 part of potassium persulfate, and 24 parts of deionized water.

[0093] Step 2: Take fluorocarbon resin and organosilicon-modified acrylate, stir at a low speed of 300 rpm for 10 min; slowly add the modified filler, gradually increase the stirring speed to 2000 rpm, and continuously disperse for 20 min. Then add the crosslinking agent and additives in sequence and mix for 10 min; according to the coating requirements, add deionized water as a diluent to adjust the viscosity of the coating to 2000 cP (25°C) to obtain the coating; the coating includes the following mass components: 50 parts of organosilicon-modified acrylate, 15 parts of fluorocarbon resin, 10 parts of modified filler (dry weight), 1 part of crosslinking agent, and 1.1 parts of additives; the additives include 0.5 part of ultraviolet absorber, 0.5 part of wetting and dispersing agent, and 0.1 part of leveling agent.

[0094] Take the coating obtained in the previous step, coat it on the surface of the base fabric, and control the wet film thickness to 10 μm; dry it, and the process is as follows: pre-dry at 80°C for 3 min; cure at 120°C for 5 min; form a functional layer to obtain the fabric.

[0095] Comparative Example 3: A preparation method of a sunscreen and breathable clothing fabric, including the following process:

[0096] Step 1: Mix ethanol, deionized water, and KH-550 with a mass ratio of 9:1:1, adjust the pH to 5, stir at 65°C for 20 min, add the filler, and stir at 85°C for 20 min to obtain the modified filler, and the filler is 50 times the mass of ethanol.

[0097] Step 2: Take fluorocarbon resin and organosilicon-modified acrylate, stir at a low speed of 300 rpm for 10 min; slowly add the modified filler, gradually increase the stirring speed to 2000 rpm, and continue to disperse for 20 min. Then add the crosslinking agent and additives in sequence and mix for 10 min; according to the coating requirements, add deionized water as a diluent to adjust the viscosity of the coating to 2000 cP (25 °C) to obtain the coating; the coating includes the following mass components: 50 parts of organosilicon-modified acrylate, 15 parts of fluorocarbon resin, 10 parts of modified filler (dry weight), 1 part of crosslinking agent, and 1.1 parts of additives; the additives include 0.5 part of ultraviolet absorber, 0.5 part of wetting and dispersing agent, and 0.1 part of leveling agent;

[0098] Take the coating obtained in the previous step and coat it on the surface of the base fabric, controlling the wet film thickness at 10 μm; dry it, and the process is as follows: pre-dry at 80 °C for 3 min; cure at 120 °C for 5 min; form a functional layer to obtain the fabric.

[0099] Experiment: Take the fabrics obtained in Examples 1-3 and Comparative Examples 1-3 to prepare specimens, and detect and record their performance respectively:

[0100] Sun protection performance test: Referring to GB / T 18830 as the reference standard, use a textile sun protection tester to detect the transmittance of the specimen in the wavelength range of 280-400 nm, and calculate its UPF value;

[0101] Air permeability performance test: Use an air permeability tester to detect the air permeability rate of the specimen, with a pressure difference of 100 Pa and a test area of 20 cm 2 ;

[0102] Water resistance performance test: Referring to ISO 6330:2012 as the reference standard, wash the specimen 20 times, dry it after washing, and then detect the sun protection performance of the specimen again. Calculate the change rate of UPF before and after washing of the specimen, which is recorded as the UPF retention rate.

[0103] UVA Transmittance (%) UVB Transmittance (%) UPF Value <![CDATA[Air permeability (L / m 2 / s)]]> UPF Retention Rate (%) Example 1 2.1 1.3 85+ 320 88 Example 2 1.8 1.0 90+ 300 90 Example 3 1.5 0.8 95+ 450 92 Comparative Example 1 5.2 3.0 50 350 65 Comparative Example 2 6.0 3.5 45 380 70 Comparative Example 3 4.0 2.2 60 400 75

[0104] According to the data in the above table, the following conclusions can be clearly obtained:

[0105] The fabrics obtained in Examples 1-3 are compared with the fabrics obtained in Comparative Examples 1-3. From the test results,

[0106] Compared with the comparative examples, the fabrics obtained in Examples 1-3 have lower UVA / UVB transmittance, higher UPF value and UPF retention rate. This fully shows that the present invention has improved the sun protection and water resistance performance of the fabricated fabrics and endows them with good air permeability.

[0107] Compared with Example 1, the filler in Comparative Example 1 was not surface-modified; in Comparative Example 2, cinnamoyloxyethyl methacrylate was not provided; and the modified filler in Comparative Example 3 was KH-550 modified filler. For the fabrics obtained in Comparative Examples 1-3, their UVA / UVB transmittance was lower, and their UPF value and UPF retention rate were even lower. It can be seen that by setting the composition and process of the functional layer, the present invention can promote the comprehensive improvement of the sun protection, water resistance and breathability of the fabric.

[0108] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention.

Claims

1. A sunscreen breathable clothing fabric, characterized in that: It includes a base fabric and a functional layer provided on the surface of the base fabric, and the functional layer is formed by coating and drying a coating material. The coating material includes the following mass components: 40-50 parts of organosilicon-modified acrylate, 15-20 parts of fluorocarbon resin, 10-35 parts of modified filler, 1-3 parts of crosslinking agent, 0.5-10 parts of auxiliary agent.

2. The sunscreen breathable clothing fabric according to claim 1, wherein: The modified filler includes the following mass components: 1.5-3.5 parts of methyl methacrylate, 1-2.3 parts of butyl acrylate, 0.5-1.2 parts of acrylic acid, 3-7 parts of cinnamoyloxyethyl methacrylate, 2-5 parts of filler, 0.10-0.15 parts of sodium bicarbonate, 0.06-0.35 parts of emulsifier, 0.12-0.46 parts of potassium persulfate, 24-50 parts of deionized water.

3. The sunscreen breathable clothing fabric according to claim 2, characterized in that: The filler is one or a mixture of nano-titanium dioxide, nano-zinc oxide, fumed silica, graphene, boron nitride, microcapsules, nano-silver, etc.

4. A preparation method of a sunscreen and breathable clothing fabric, characterized in that: It includes the following processes: Mix the fluorocarbon resin and organosilicon-modified acrylate, add the filler, disperse at high speed, add the crosslinking agent and auxiliary agent, and mix evenly to obtain the coating material. Take the coating material obtained in the previous step, coat it on the surface of the base fabric, and dry it to form a functional layer to obtain the fabric.

5. The preparation method of a sunscreen and breathable clothing fabric according to claim 4, characterized in that: The filler is surface-modified, and the specific process is as follows: Mix methyl methacrylate, butyl acrylate, acrylic acid, cinnamoyloxyethyl methacrylate and the filler, heat to 45-55°C, stir and disperse to obtain an oil phase. Add sodium bicarbonate and emulsifier to deionized water to obtain an aqueous phase. Under stirring conditions, slowly add the oil phase to the aqueous phase, and finish adding in 30 min; stir for 20-30 min, place at 0-4°C and ultrasonically emulsify for 15-20 min to obtain a pre-emulsion. Heat the pre-emulsion to 50-60°C, slowly add potassium persulfate under stirring conditions, and finish adding in 30-60 min, and then keep the temperature for reaction for 240-300 min to obtain the modified filler.

6. The preparation method of a sunscreen breathable clothing fabric according to claim 5, characterized in that: Before use, the filler is subjected to coupling modification treatment, and the specific process is as follows: Mix ethanol, deionized water and γ-methacryloxypropyltrimethoxysilane, adjust the pH to 4.5-5.5, place at 60-70°C and stir for 15-20 min to obtain a silane hydrolysis solution. Take the filler, add it to the silane hydrolysis solution under stirring conditions, and stir at 90-110°C for 15-30 min to obtain the coupling-modified filler.

7. The preparation method of a sunscreen and breathable clothing fabric according to claim 6, characterized in that: The mass ratio of ethanol, deionized water and γ-methacryloxypropyltrimethoxysilane is (80-90):(10-20):(3-10); The mass ratio of the filler to the silane hydrolysis solution is 10:(5-10).

8. The preparation method of a sunscreen and breathable clothing fabric according to claim 4, characterized in that: A breathable layer is provided between the functional layer and the base fabric; The breathable layer is prepared by the following process: Take fluorocarbon resin and organosilicon-modified acrylate, stir for 5-10 min to fully mix the resin base material; add a pore-forming agent and an auxiliary agent to obtain a bottom coating material. Coat the bottom coating material on the surface of the base fabric and dry it to form a breathable layer.

9. The preparation method of a sunscreen breathable clothing fabric according to claim 8, characterized in that: The bottom coating material includes the following mass components: 55-65 parts of organosilicon-modified acrylate, 5-10 parts of fluorocarbon resin, 6-10 parts of pore-forming agent, 0.5-1.0 part of auxiliary agent; The pore former is a mixture of ammonium bicarbonate and polyvinyl alcohol, and the mass ratio is 8:

3.

10. The preparation method of a sunscreen and breathable clothing fabric according to claim 4, characterized in that: Segmented drying is adopted, and the process is as follows: pre-dry at 80-100 °C for 2-3 minutes; cure at 120-150 °C for 3-5 minutes.