A layered composite fabric based on an ultraviolet-resistant coating, a method of preparation and use in sunshade fabrics

Abstract

The application relates to the technical field of layered composite fabrics, and discloses a layered composite fabric based on an anti-ultraviolet coating, a preparation method and application in sunshade fabrics, the preparation method of the layered composite fabric based on the anti-ultraviolet coating comprises the following steps: in-situ growth of zirconium-doped nano cerium oxide on a polydopamine modified ZIF-L surface, then modification with a silane coupling agent to obtain a surface-modified ZIF-L hybrid nanomaterial; the surface-modified ZIF-L hybrid nanomaterial is treated with a modifier and 1-chlorohexane to obtain a functional filler; an anti-ultraviolet emulsion containing the functional filler is used to treat a polyacrylonitrile base cloth to form an anti-ultraviolet coating, so that a sunscreen fabric is obtained; and the polyester base cloth fabric, the antibacterial fabric and the sunscreen fabric are compounded to obtain the layered composite fabric based on the anti-ultraviolet coating; the product is excellent in water-proofness, sun-proofness, antibacterial and mildew-proofness and mosquito-repelling effect, and can be used in outdoor or indoor sunshade fabrics.

Description

Technical Field

[0001] This invention relates to the field of layered composite fabric technology, specifically to a layered composite fabric based on an anti-UV coating, its preparation method, and its application in sunshade fabrics. Background Technology

[0002] With the progress of social productivity and the development of urbanization in my country, people's demand for sun shading is increasing. Traditional sun shading methods are no longer suitable for modern public spaces, and sun shading decorative fabrics have been greatly developed. The most basic requirement for the application of sun shading decorative fabrics is UV resistance. Adding a surface UV-resistant coating to the sun shading fabric is one of the common methods to improve the UV resistance of the sun shading fabric.

[0003] For example, Chinese patent application CN110409190A discloses an ultra-thin fiberglass sunshade fabric, including a fabric and a coating applied to the surface of the fabric. Chinese patent application CN110409190A not only improves the UV resistance of the fabric, but also solves the problem of mildew on the sunshade fabric; however, the waterproof performance of the ultra-thin fiberglass sunshade fabric needs to be improved, and it is easily affected by rain when used in outdoor environments. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for preparing a layered composite fabric based on an anti-UV coating, comprising the following steps: Step 1: Zirconium-doped cerium oxide nanoparticles are grown in situ on the surface of polydopamine-modified ZIF-L, and then the surface is modified with silane coupling agent KH-560 to obtain surface-modified ZIF-L hybrid nanomaterials; wherein, the polydopamine-modified ZIF-L is obtained by polymerizing dopamine on the surface of ZIF-L. Step 2: 5-Formylnicotinic acid reacts with 2,2-bis(4-aminophenyl)hexafluoropropane to obtain a modifier; the surface-modified ZIF-L hybrid nanomaterials are then treated with the modifier and 1-chlorohexane to obtain a functional filler. Step 3: Mix acrylic emulsion, deionized water, functional filler, and additives to obtain an anti-UV emulsion; use the anti-UV emulsion to impregnate and pad polyacrylonitrile base fabric to form an anti-UV coating on the polyacrylonitrile base fabric, thereby obtaining a sunscreen layer fabric. Step 4: Lay the layers together in the following order from bottom to top: polyester base fabric, antibacterial fabric, and sun protection fabric, to obtain a layered composite fabric based on an anti-UV coating.

[0005] Preferably, in step one, the preparation method of the surface-modified ZIF-L hybrid nanomaterial is as follows: Under stirring, polydopamine-modified ZIF-L, cerium nitrate hexahydrate, zirconium oxychloride, polyvinylpyrrolidone, and an aqueous ethanol solution were mixed in a mass ratio of (2-3):(2.07-3.31):(1.61-2.57):(8-13.8):(350-550). The pH of the reaction mixture was adjusted to 8, and the mixture was subjected to hydrothermal reaction at 190-210℃ for 2.5-3.5 h. The product was purified to obtain ZIF-L hybrid nanomaterials. 25wt% ammonia, deionized water, and ethanol were mixed in a volume ratio of 0.7:10:30 to obtain a mixed solvent. ZIF-L hybrid nanomaterials were added to the mixed solvent and sonicated. Silane coupling agent KH-560 and ethanol were added, and the mixture was heated to 58-62℃ for 100-150 min with stirring. The product was purified to obtain surface-modified ZIF-L hybrid nanomaterials. The mass ratio of the ZIF-L hybrid nanomaterials, mixed solvent, silane coupling agent KH-560, and ethanol was (2-3):(140-210):(0.1-0.5):(32-48). In the above process, the abundant phenolic hydroxyl groups on the surface of polydopamine-modified ZIF-L can promote the adsorption of cerium and zirconium ions on the polydopamine-modified ZIF-L, providing growth sites for zirconium-doped cerium oxide nanoparticles. During the growth of zirconium-doped cerium oxide nanoparticles, the larger cerium ions in cerium oxide are replaced by smaller zirconium ions, leading to lattice shrinkage and deformation, promoting the formation of oxygen vacancies. Due to its suitable band gap (3.1 eV), cerium oxide can absorb ultraviolet light, and the formation of oxygen vacancies endows zirconium-doped cerium oxide nanoparticles with better anti-ultraviolet sun protection properties. In addition, cerium oxide can also form a dense and stable carbonized layer during the pyrolysis of polymers, thereby inhibiting the combustion of organic polymer matrices. Therefore, the in-situ growth of zirconium-doped nanoparticles on the surface of polydopamine-modified ZIF-L is a promising development. The resulting ZIF-L hybrid nanomaterials, using cerium oxide, combine the advantages of polydopamine-modified ZIF-L and cerium oxide. Furthermore, the polydopamine-modified ZIF-L can serve as a dispersion platform for cerium oxide, promoting its uniform dispersion within the polymer matrix. Additionally, the growth of zirconium-doped cerium oxide nanoparticles further extends the water's path, endowing the ZIF-L hybrid nanomaterials with better waterproof properties. Therefore, the polydopamine-modified ZIF-L and zirconium-doped cerium oxide nanoparticles mutually promote and synergistically enhance each other, resulting in ZIF-L hybrid nanomaterials exhibiting excellent antibacterial, waterproof, sun-proof, and flame-retardant properties. Furthermore, surface modification of the ZIF-L hybrid nanomaterials using the silane coupling agent KH-560 introduces epoxy groups into the ZIF-L hybrid nanomaterials.

[0006] Preferably, in step one, the preparation method of the polydopamine-modified ZIF-L is as follows: At 23-25℃, a 3.85wt% zinc nitrate aqueous solution was added to an equal volume of a 9.91wt% 2-methylimidazole aqueous solution, and the mixture was stirred at 600-700 r / min for 1.5-2.5 h to purify the solution and obtain ZIF-L. Dopamine hydrochloride, Tris-HCl buffer, and ethanol were mixed at a mass ratio of (0.18-0.2):(150-180):(40-50) to obtain a modified solution. ZIF-L was added to the modified solution for soaking and treatment, and stirred at 24-26℃ for 20-28 h to purify the product, thereby obtaining polydopamine-modified ZIF-L. The mass ratio of ZIF-L to the modified solution was (5-8):(50-70). In the above process, a two-dimensional leaf-shaped metal-organic framework material ZIF-L was prepared using zinc nitrate and 2-methylimidazole as raw materials. ZIF-L can release zinc ions and imidazole groups with bactericidal effects, and the imidazole groups can absorb ultraviolet radiation, thus exhibiting excellent anti-ultraviolet sun protection effects. In addition, the two-dimensional structure of ZIF-L can extend the movement path of water, giving it waterproof properties. At the same time, during combustion, ZIF-L can inhibit the combustion of organic polymer matrices by passing through physical barriers and the formation of catalytic layers. Therefore, ZIF-L has multiple functions of antibacterial, waterproof, sun protection, and flame retardant. Then, polydopamine is polymerized on the surface of ZIF-L to form polydopamine. The introduction of polydopamine promotes the improvement of antibacterial, sun protection, and flame retardant properties of ZIF-L. Furthermore, it introduces a large number of phenolic hydroxyl groups, promoting the uniform growth of zirconium-doped cerium oxide nanoparticles. In addition, the modification of polydopamine makes ZIF-L have better dispersion effects in polymer matrices.

[0007] Preferably, in step two, the preparation method of the functional filler is as follows: 5-Formylnicotinic acid, 2,2-bis(4-aminophenyl)hexafluoropropane and N,N-dimethylformamide were mixed in a mass ratio of (3-6):(3.7-7.1):(80-120), heated to 70-80℃, stirred for 3-5 h, and the product was purified to obtain the modifier. Surface-modified ZIF-L hybrid nanomaterials were added to N,N-dimethylformamide, along with a modifier, triethylamine, and hydroquinone. After the acid value of the reaction system remained unchanged, the mixture was purified to obtain grafted modified ZIF-L hybrid nanomaterials. The mass ratio of the surface-modified ZIF-L hybrid nanomaterials, N,N-dimethylformamide, modifier, triethylamine, and hydroquinone was (2-3):(120-150):(4.7-7.5):(0.02-0.04):(0.01-0.03). The grafted modified ZIF-L hybrid nanomaterials were added to ethanol, sonicated, and then 1-chlorohexane was added. The mixture was stirred at 23-27℃ for 5-7 hours, and the product was purified to obtain the functional filler. The mass ratio of the grafted modified ZIF-L hybrid nanomaterials, ethanol and 1-chlorohexane was (2-3):(80-100):(1.2-2.6). In the above process, the aldehyde group of 5-formylnicotinic acid reacts with the amino groups at both ends of 2,2-bis(4-aminophenyl)hexafluoropropane to generate Schiff base bonds, yielding a modifier. This modifier contains carboxyl groups, a benzene ring, a pyridine ring, a trifluoromethyl group, and a Schiff base bond. The benzene ring and pyridine ring, through the formation of a conjugated system, exhibit UV protection. The trifluoromethyl group possesses excellent hydrophobic and waterproof properties as well as UV protection. The Schiff base bond exhibits certain antibacterial properties. Furthermore, during combustion, the benzene ring and pyridine ring also contribute to the formation of a strong and dense carbon layer, thereby improving the flame retardancy of the organic polymer matrix. Performance: During the reaction, the epoxy groups on the surface-modified ZIF-L hybrid nanomaterials undergo ring-opening and react with the carboxyl groups in the modifier to generate hydroxyl and ester groups, thereby grafting the modifier onto the surface-modified ZIF-L hybrid nanomaterials. This results in grafted modified ZIF-L hybrid nanomaterials with excellent antibacterial, waterproof, sun-proof, and flame-retardant properties. Then, 1-chlorohexane reacts with the hydroxyl groups generated in the reaction through a substitution reaction to introduce hydrophobic alkyl chains, thus obtaining a functional filler. Therefore, compared with the grafted modified ZIF-L hybrid nanomaterials, the waterproof performance of the functional filler is further improved.

[0008] Preferably, in step three, the UV-resistant emulsion comprises, by weight, 100 parts acrylic emulsion, 150-200 parts deionized water, 16-38 parts functional filler, and 11.8-26.1 parts additives.

[0009] Preferably, in step three, the additives include 6.5-15 parts of wetting agent, 0.3-1.1 parts of defoamer, and 5-10 parts of thickener by weight.

[0010] Preferably, in step three, the wetting agent includes 5-chloro-2-methyl-4-isothiazolin-3-one; and the defoamer includes a mineral oil defoamer.

[0011] Preferably, in step three, the thickener is obtained by mixing white oil, polyacrylamide, and Tween-20 in a mass ratio of 1:1:0.4.

[0012] Preferably, in step three, the roll residue of the dip-rolling treatment is 50-80%, and the baking conditions are: baking temperature of 150-170℃ and baking time of 1-3 minutes.

[0013] Preferably, in step three, the warp density of the polyacrylonitrile base fabric is 74-78 threads / inch, and the weft density is 35-38 threads / inch.

[0014] Preferably, in step four, the layers of the layered composite fabric based on the UV-resistant coating are bonded together by polyurethane hot melt adhesive.

[0015] Preferably, in step four, the basis weight of the polyester base fabric layer is 100-120 g / m². 2 .

[0016] In step three and step four, the method for preparing the antibacterial layer fabric is as follows: Step S1: Boil lemon leaf powder in distilled water for 5-10 minutes, then filter to obtain lemon leaf water extract; mix lemon leaf water extract and 20mM silver nitrate aqueous solution at a volume ratio of (5-10):(50-90), and continuously stir and react for 2-3 hours under dark conditions at 25-28℃. During the reaction, maintain the pH value of the reaction system at 7.5-8.0, purify the product, and obtain nano-silver with a particle size of 100-245nm. Step S2: Add silane coupling agent KH-550 hydrolysate to a 2.5-10 wt% nano-silver ethanol dispersion, stir for 20-40 min, and react at 60-80℃ for 4-6 h. Purify the product to obtain surface-modified nano-silver. The mass ratio of silane coupling agent KH-550 to nano-silver is (0.01-0.02):1. The silane coupling agent KH-550 hydrolysate is obtained by mixing silane coupling agent KH-550, deionized water, and ethanol in a mass ratio of 2.5:1:9, and then adjusting the pH to 4 with acetic acid. Surface-modified nano-silver was added to ethanol, then coumaric acid was added, and the mixture was stirred at 20-30℃ for 1-3 hours. The product was purified to obtain modified nano-silver. The mass ratio of the surface-modified nano-silver, ethanol and coumaric acid was (3-4):(120-150):(1.4-2.8). Step S3: Modified nano-silver and polyester masterbatch are mixed at a mass ratio of (75-95):(5-25) and melt-spun at 230-250℃ to obtain modified polyester fiber; the polyester fiber and modified polyester fiber are blended at a mass ratio of (30-60):(40-70) to form yarn, and knitted to obtain antibacterial layer fabric; wherein the weight of the antibacterial layer fabric is 120-150 g / m². 2 ; In the above process, lemon leaf extract is used as a natural reducing agent to prepare nano-silver. The resulting nano-silver retains secondary metabolites from the natural lemon leaf extract, such as flavonoids, terpenes, and phenolic compounds. These flavonoids, terpenes, and phenolic compounds synergistically enhance the antibacterial effect with the nano-silver. Furthermore, the nano-silver can also achieve a certain mosquito-repellent effect by reducing the microbial community that produces volatile attractants. Further, the surface of the nano-silver is modified using the silane coupling agent KH-550, introducing amino groups onto the surface. These amino groups then bind with coumaric acid through electrostatic interactions between the carboxyl and amino groups, thereby... Coumaric acid grafted onto surface-modified silver nanoparticles exhibits excellent antibacterial and bactericidal properties. Furthermore, the presence of ester groups within the pyran ring and carboxylic acid ester groups further enhances its mosquito-repellent properties. Additionally, the chromophore group (-COOH) in coumaric acid demonstrates superior UV absorption in the 200–400 nm wavelength range, with a maximum absorption rate of 285 nm. Therefore, the modified silver nanoparticles not only possess excellent antibacterial and mosquito-repellent effects but also exhibit some UV protection. Moreover, compared to pure silver nanoparticles, the modified silver nanoparticles show better interfacial compatibility with the polyester matrix.

[0017] The layered composite fabric based on the anti-ultraviolet coating was prepared by the aforementioned method for preparing layered composite fabric based on anti-ultraviolet coating.

[0018] The layered composite fabric based on the anti-UV coating of the present invention can be used in sunshade fabrics.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The layered composite fabric based on an anti-UV coating of the present invention comprises, from bottom to top, a polyester base fabric, an antibacterial layer, and a sun-protective layer. The polyester base fabric has advantages such as high durability, strong weather resistance, and easy cleaning; the antibacterial layer has excellent antibacterial properties, preventing the growth of bacteria and mold, and also has a good mosquito-repellent effect; the sun-protective layer has excellent waterproof and sun-protective properties, and also has certain antibacterial and flame-retardant properties; the layers of the layered composite fabric based on the anti-UV coating are interconnected. This synergistic material not only boasts excellent waterproof, sunproof, antibacterial, and mildew-proof properties, but also provides a good mosquito-repellent effect. The layered composite fabric based on the UV-resistant coating can be used in sunshade fabrics, which can be used both outdoors and indoors. When used indoors, it can be made into roller blinds or vertical blinds and hung near windows, effectively preventing mosquitoes from entering the room when the windows are open. Furthermore, the sunshade fabric based on the UV-resistant coating also possesses certain flame-retardant properties, meeting the needs of public places with high requirements for flame-retardant and fire-resistant performance.

[0020] 2. The sun protection layer of the layered composite fabric based on the anti-UV coating of the present invention is obtained by impregnating a polyacrylonitrile base fabric with an anti-UV emulsion. The anti-UV emulsion contains functional fillers, including ZIF-L hybrid nanomaterials with zirconium-doped cerium oxide nanoparticles on the surface, and modifiers and 1-chlorohexane grafted onto the ZIF-L hybrid nanomaterials. The ZIF-L hybrid nanomaterials combine the advantages of polydopamine-modified ZIF-L and cerium oxide, and have excellent antibacterial, waterproof, sun protection, and flame retardant properties. Dopamine-modified ZIF-L can serve as a dispersion platform for cerium oxide, promoting its uniform dispersion in the polymer matrix. Furthermore, the production of zirconium-doped nano-cerium oxide further extends the water's path, giving ZIF-L hybrid nanomaterials better waterproof performance. The introduction of modifiers and 1-chlorohexane into ZIF-L hybrid nanomaterials improves the antibacterial, waterproof, sun-protective, and flame-retardant properties of the functional filler, as well as its dispersibility in acrylic emulsions, thereby giving the sun-protective layer fabric excellent antibacterial, waterproof, sun-protective, and flame-retardant properties.

[0021] 3. The antibacterial layer of the layered composite fabric based on the anti-UV coating of the present invention is prepared by modified nano-silver and polyester masterbatch. The modified nano-silver includes nano-silver prepared from natural lemon leaves and coumaric acid on its surface. The nano-silver retains the secondary metabolites in the natural lemon leaf extract, which not only has a better antibacterial effect, but also repels mosquitoes. The coumaric acid on the surface of the nano-silver improves the compatibility between the nano-silver and the polyester matrix, and gives the modified nano-silver better antibacterial properties, sun protection properties and mosquito repellent effects. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the layered composite fabric based on the anti-UV coating of the present invention; Among them, 1 is the polyester base fabric, 2 is the antibacterial fabric, and 3 is the sun protection fabric. Figure 2 This is a comparison chart of UPF test results for the layered composite fabrics based on anti-UV coatings prepared in Examples 2-4 and Comparative Examples 3-7 of the present invention. Figure 3 These are comparative hydrostatic pressure test results of the layered composite fabrics based on anti-UV coatings prepared in Examples 2-4 and Comparative Examples 2-5 of the present invention. Figure 4 This is a comparison chart of the repellency test results of the layered composite fabrics based on anti-UV coatings prepared in Examples 2-4 and Comparative Examples 2-5 of the present invention. Figure 5 This is a comparison chart of the antibacterial rates of Staphylococcus aureus and Escherichia coli on the layered composite fabrics based on anti-UV coatings prepared in Examples 2-4 and Comparative Examples 2-5. Figure 6This is a schematic diagram of the synthesis of the modifier of the present invention. Detailed Implementation

[0023] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Example 1 This embodiment discloses a method for preparing an acyl antibacterial layer fabric, including the following steps: Step S1: Rinse 10g of fresh lemon leaves with tap water, then wash with distilled water to remove surface impurities, dry and grind into powder. Boil the powder in 100g of distilled water for 8 minutes, then filter through Whatman No. 1 filter paper to obtain lemon leaf water extract. Add 8mL of lemon leaf water extract dropwise to 70mL of 20mM silver nitrate aqueous solution, and stir continuously for 2-3 hours in the dark at 26°C. During the reaction, maintain the pH of the reaction system at 7.8 with 10wt% sodium hydroxide aqueous solution. After the reaction is completed, centrifuge, wash the centrifuged product with deionized water, and dry at 25°C to obtain silver nanoparticles with a particle size of 150nm. Step S2: Add silane coupling agent KH-550 hydrolysate to a 7wt% nano-silver ethanol dispersion, stir for 30 min, and react at 70℃ for 5 h. After the reaction, centrifuge, wash, and dry to obtain surface-modified nano-silver. The mass ratio of silane coupling agent KH-550 to nano-silver is 0.015:1. The silane coupling agent KH-550 hydrolysate is obtained by mixing silane coupling agent KH-550, deionized water, and ethanol in a mass ratio of 2.5:1:9, and then adjusting the pH to 4 with acetic acid. 3.5g of surface-modified nano-silver was added to 135g of ethanol and sonicated for 60min. Then 2.1g of coumaric acid was added and the mixture was stirred at 25℃ for 2h. After the reaction was completed, the nano-silver was centrifuged, washed, and dried to obtain the modified nano-silver. Step S3: Mix modified nano-silver and polyester masterbatch at a mass ratio of 85:15, and melt-spin at 240℃ to obtain modified polyester fiber; blend polyester fiber and modified polyester fiber at a mass ratio of 45:55 to form yarn, and knit to obtain a yarn with a basis weight of 135 g / m². 2 The antibacterial layer fabric.

[0025] Example 2 This embodiment discloses a method for preparing a layered composite fabric based on an anti-UV coating, including the following steps: Step 1: At 23°C, zinc nitrate hexahydrate and 2-methylimidazole were dissolved in deionized water to prepare a 3.85 wt% zinc nitrate aqueous solution and a 9.91 wt% 2-methylimidazole aqueous solution. The 3.85 wt% zinc nitrate aqueous solution was added to an equal volume of the 9.91 wt% 2-methylimidazole aqueous solution, and the mixture was stirred at 600 r / min for 1.5 h. After the reaction was completed, the mixture was centrifuged at 8000 rpm for 30 min. The centrifuged product was washed three times each with deionized water and methanol, and dried at 65°C to obtain ZIF-L. 0.18 g of dopamine hydrochloride, 150 g of Tris-HCl buffer solution with pH 8.5, and 40 g of ethanol were mixed to obtain a modified solution; then 5 g of ZIF-L was added to 50 g of the modified solution for soaking treatment, stirred at 24 °C for 28 h, centrifuged, the centrifuged product was washed 3 times with deionized water, and vacuum dried at 55 °C to obtain polydopamine modified ZIF-L; At a stirring speed of 600 r / min, 2 g of polydopamine-modified ZIF-L, 2.07 g of cerium nitrate hexahydrate, 1.61 g of zirconium oxychloride and 8 g of polyvinylpyrrolidone were added to 350 g of 50% ethanol aqueous solution. The pH of the reaction mixture was then adjusted to 8 with 25 wt% ammonia. The mixture was hydrothermally reacted at 190 °C for 3.5 h. The precipitate was collected by filtration and washed alternately with deionized water and ethanol. The precipitate was then vacuum dried at 50 °C to obtain ZIF-L hybrid nanomaterials. 25wt% ammonia, deionized water, and ethanol were mixed in a volume ratio of 0.7:10:30 to obtain a mixed solvent. 2g of ZIF-L hybrid nanomaterials were added to 140g of the mixed solvent and sonicated for 40min. Then, 0.1g of silane coupling agent KH-560 and 32g of ethanol were added. The mixture was heated to 58℃ for 150min with stirring. After the reaction was completed, the precipitate was collected by filtration, washed with ethanol, and then vacuum dried at 40℃ to obtain surface-modified ZIF-L hybrid nanomaterials. Step 2: Mix 3g of 5-formylnicotinic acid, 3.7g of 2,2-bis(4-aminophenyl)hexafluoropropane and 80g of N,N-dimethylformamide, heat to 70℃, stir and react for 5h. After the reaction is completed, remove the solvent by rotary evaporation to obtain the crude product. Wash the crude product with deionized water and methanol, and then dry it under vacuum at 70℃ to obtain the modifier. 2g of surface-modified ZIF-L hybrid nanomaterials were added to 120g of N,N-dimethylformamide and sonicated for 40min. Then, 4.7g of modifier, 0.02g of catalyst triethylamine, and 0.01g of inhibitor hydroquinone were added. After the acid value of the reaction system remained unchanged, the precipitate was collected by filtration and washed successively with ethanol and N,N-dimethylformamide. Then, it was vacuum dried at 40℃ to obtain grafted modified ZIF-L hybrid nanomaterials. 2g of grafted modified ZIF-L hybrid nanomaterials were added to 80g of ethanol and sonicated for 40min. Then 1.2g of 1-chlorohexane was added and the mixture was stirred at 23℃ for 7h. After the reaction was completed, the precipitate was collected by filtration, washed with ethanol and deionized water in sequence, and then vacuum dried at 37℃ to obtain the functional filler. Step 3: By weight, take 100 parts of acrylic emulsion, 150 parts of deionized water, 16 parts of functional filler, 6.5 parts of 5-chloro-2-methyl-4-isothiazolin-3-one, 0.3 parts of mineral oil defoamer, and 5 parts of thickener, and mix them evenly to obtain an anti-UV emulsion; wherein, the thickener is obtained by mixing white oil, polyacrylamide, and Tween-20 in a mass ratio of 1:1:0.4. An anti-UV emulsion is used to impregnate a polyacrylonitrile base fabric, followed by baking and cooling to form an anti-UV coating on the polyacrylonitrile base fabric, thereby obtaining a sun-protective layer fabric; wherein, the warp density of the polyacrylonitrile base fabric is 74 threads / inch and the weft density is 35 threads / inch; the padding residue of the impregnation treatment is 50%; the baking conditions are: temperature of 150°C and baking time of 3 minutes. Step 4: Composite the following layers in the following order from bottom to top: polyester base fabric, antibacterial layer fabric prepared in Example 1, and sun-protective layer fabric, to obtain a layered composite fabric based on an anti-UV coating; wherein, the layers of the layered composite fabric based on the anti-UV coating are bonded together with polyurethane hot melt adhesive; the basis weight of the polyester base fabric is 100 g / m². 2 .

[0026] Example 3 This embodiment discloses a method for preparing a layered composite fabric based on an anti-UV coating, including the following steps: Step 1: At 25°C, zinc nitrate hexahydrate and 2-methylimidazole were dissolved in deionized water to prepare a 3.85 wt% zinc nitrate aqueous solution and a 9.91 wt% 2-methylimidazole aqueous solution. The 3.85 wt% zinc nitrate aqueous solution was added to an equal volume of the 9.91 wt% 2-methylimidazole aqueous solution, and the mixture was stirred at 700 r / min for 2.5 h. After the reaction was completed, the mixture was centrifuged at 8000 rpm for 30 min. The centrifuged product was washed three times each with deionized water and methanol, and dried at 65°C to obtain ZIF-L. 0.2 g of dopamine hydrochloride, 180 g of Tris-HCl buffer solution with pH 8.5, and 50 g of ethanol were mixed to obtain a modified solution; then 8 g of ZIF-L was added to 70 g of the modified solution for soaking treatment, stirred at 26 °C for 20 h, centrifuged, the centrifuged product was washed 3 times with deionized water, and vacuum dried at 55 °C to obtain polydopamine modified ZIF-L; At a stirring speed of 700 r / min, 3 g of polydopamine-modified ZIF-L, 3.31 g of cerium nitrate hexahydrate, 2.57 g of zirconium oxychloride and 13.8 g of polyvinylpyrrolidone were added to 550 g of 50% ethanol aqueous solution. The pH of the reaction mixture was then adjusted to 8 with 25 wt% ammonia. The mixture was hydrothermally reacted at 210 °C for 2.5 h. The precipitate was collected by filtration and washed alternately with deionized water and ethanol. The precipitate was then vacuum dried at 50 °C to obtain ZIF-L hybrid nanomaterials. 25wt% ammonia, deionized water, and ethanol were mixed in a volume ratio of 0.7:10:30 to obtain a mixed solvent. 3g of ZIF-L hybrid nanomaterials were added to 210g of the mixed solvent and sonicated for 80min. Then, 0.5g of silane coupling agent KH-560 and 48g of ethanol were added. The mixture was heated to 62℃ for 100min with stirring. After the reaction was completed, the precipitate was collected by filtration, washed with ethanol, and dried under vacuum at 40℃ to obtain surface-modified ZIF-L hybrid nanomaterials. Step 2: Mix 6g of 5-formylnicotinic acid, 7.1g of 2,2-bis(4-aminophenyl)hexafluoropropane and 120g of N,N-dimethylformamide, heat to 80℃, stir and react for 3h. After the reaction is completed, remove the solvent by rotary evaporation to obtain the crude product. Wash the crude product with deionized water and methanol, and then dry it under vacuum at 70℃ to obtain the modifier. 3g of surface-modified ZIF-L hybrid nanomaterials were added to 150g of N,N-dimethylformamide and sonicated for 80min. Then, 7.5g of modifier, 0.04g of catalyst triethylamine, and 0.03g of inhibitor hydroquinone were added. After the acid value of the reaction system remained unchanged, the precipitate was collected by filtration and washed successively with ethanol and N,N-dimethylformamide. Then, it was vacuum dried at 40℃ to obtain grafted modified ZIF-L hybrid nanomaterials. 3g of grafted modified ZIF-L hybrid nanomaterials were added to 100g of ethanol and sonicated for 80min. Then 2.6g of 1-chlorohexane was added and the mixture was stirred at 27℃ for 5h. After the reaction was completed, the precipitate was collected by filtration, washed with ethanol and deionized water in sequence, and then dried under vacuum at 37℃ to obtain the functional filler. Step 3: By weight, take 100 parts of acrylic emulsion, 200 parts of deionized water, 38 parts of functional filler, 15 parts of 5-chloro-2-methyl-4-isothiazolin-3-one, 1.1 parts of mineral oil defoamer, and 10 parts of thickener, and mix them evenly to obtain an anti-UV emulsion; wherein, the thickener is obtained by mixing white oil, polyacrylamide, and Tween-20 in a mass ratio of 1:1:0.4. An anti-UV emulsion is used to impregnate a polyacrylonitrile base fabric, followed by baking and cooling to form an anti-UV coating on the polyacrylonitrile base fabric, thereby obtaining a sun-protective layer fabric; wherein, the warp density of the polyacrylonitrile base fabric is 78 threads / inch and the weft density is 38 threads / inch; the padding residue of the impregnation treatment is 80%; the baking conditions are: temperature 170℃ and baking time 1 minute. Step 4: Composite the following layers in the following order from bottom to top: polyester base fabric, antibacterial layer fabric prepared in Example 1, and sun-protective layer fabric, to obtain a layered composite fabric based on an anti-UV coating; wherein, the layers of the layered composite fabric based on the anti-UV coating are bonded together with polyurethane hot melt adhesive; the basis weight of the polyester base fabric is 120 g / m². 2 .

[0027] Example 4 This embodiment discloses a method for preparing a layered composite fabric based on an anti-UV coating, including the following steps: Step 1: At 24°C, zinc nitrate hexahydrate and 2-methylimidazole were dissolved in deionized water to prepare a 3.85 wt% zinc nitrate aqueous solution and a 9.91 wt% 2-methylimidazole aqueous solution. The 3.85 wt% zinc nitrate aqueous solution was added to an equal volume of the 9.91 wt% 2-methylimidazole aqueous solution, and the mixture was stirred at 650 r / min for 2 h. After the reaction was completed, the mixture was centrifuged at 8000 rpm for 30 min. The centrifuged product was washed three times each with deionized water and methanol, and dried at 65°C to obtain ZIF-L. 0.19 g of dopamine hydrochloride, 165 g of Tris-HCl buffer solution with pH 8.5, and 445 g of ethanol were mixed to obtain a modified solution. Then, 6.5 g of ZIF-L was added to 60 g of the modified solution for soaking and treatment. The mixture was stirred at 25 °C for 24 h, centrifuged, and the centrifuged product was washed three times with deionized water and dried under vacuum at 55 °C to obtain polydopamine-modified ZIF-L. At a stirring speed of 650 r / min, 2.5 g of polydopamine-modified ZIF-L, 2.69 g of cerium nitrate hexahydrate, 2.09 g of zirconium oxychloride and 10.9 g of polyvinylpyrrolidone were added to 450 g of 50% ethanol aqueous solution. The pH of the reaction mixture was then adjusted to 8 with 25 wt% ammonia. The mixture was hydrothermally reacted at 200 °C for 3 h. The precipitate was collected by filtration and washed alternately with deionized water and ethanol. The precipitate was then vacuum dried at 50 °C to obtain ZIF-L hybrid nanomaterials. 25wt% ammonia, deionized water, and ethanol were mixed in a volume ratio of 0.7:10:30 to obtain a mixed solvent. 2.5g of ZIF-L hybrid nanomaterials were added to 175g of the mixed solvent and sonicated for 6min. Then, 0.3g of silane coupling agent KH-560 and 40g of ethanol were added. The mixture was heated to 60℃ for 125min with stirring. After the reaction was completed, the precipitate was collected by filtration, washed with ethanol, and then vacuum dried at 40℃ to obtain surface-modified ZIF-L hybrid nanomaterials. Step 2: Mix 4.5g of 5-formylnicotinic acid, 5.4g of 2,2-bis(4-aminophenyl)hexafluoropropane and 100g of N,N-dimethylformamide, heat to 75℃, stir and react for 4h. After the reaction is completed, remove the solvent by rotary evaporation to obtain the crude product. Wash the crude product with deionized water and methanol, and then dry it under vacuum at 70℃ to obtain the modifier. 2.5g of surface-modified ZIF-L hybrid nanomaterials were added to 135g of N,N-dimethylformamide and sonicated for 60min. Then, 6.1g of modifier, 0.03g of catalyst triethylamine, and 0.02g of inhibitor hydroquinone were added. After the acid value of the reaction system remained unchanged, the precipitate was collected by filtration and washed successively with ethanol and N,N-dimethylformamide. Then, it was vacuum dried at 40℃ to obtain grafted modified ZIF-L hybrid nanomaterials. 2.5g of grafted modified ZIF-L hybrid nanomaterials were added to 90g of ethanol and sonicated for 60min. Then 1.9g of 1-chlorohexane was added and the mixture was stirred at 25℃ for 6h. After the reaction was completed, the precipitate was collected by filtration, washed with ethanol and deionized water in sequence, and then dried under vacuum at 37℃ to obtain the functional filler. Step 3: By weight, take 100 parts of acrylic emulsion, 175 parts of deionized water, 27 parts of functional filler, 10.8 parts of 5-chloro-2-methyl-4-isothiazolin-3-one, 0.7 parts of mineral oil defoamer, and 7.5 parts of thickener, and mix them evenly to obtain an anti-UV emulsion; wherein, the thickener is obtained by mixing white oil, polyacrylamide, and Tween-20 in a mass ratio of 1:1:0.4. An anti-UV emulsion is used to impregnate a polyacrylonitrile base fabric, followed by baking and cooling to form an anti-UV coating on the polyacrylonitrile base fabric, thereby obtaining a sun-protective layer fabric; wherein, the warp density of the polyacrylonitrile base fabric is 76 threads / inch and the weft density is 37 threads / inch; the padding residue of the impregnation treatment is 65%; the baking conditions are: temperature 160℃ and baking time 2 minutes. Step 4: Composite the following layers in the following order from bottom to top: polyester base fabric, antibacterial layer fabric prepared in Example 1, and sun-protective layer fabric, to obtain a layered composite fabric based on an anti-UV coating; wherein, the layers of the layered composite fabric based on the anti-UV coating are bonded together with polyurethane hot melt adhesive; the basis weight of the polyester base fabric is 110 g / m². 2 .

[0028] Comparative Example 1 Compared with Example 1, Comparative Example 1 used surface-modified nano-silver prepared in Example 1 instead of modified nano-silver in the process of preparing modified polyester fiber, while other conditions remained unchanged.

[0029] Comparative Example 2 Compared with Example 1, Comparative Example 2 used commercially available nanosilver in the preparation of surface-modified nanosilver, while other conditions remained unchanged.

[0030] Comparative Example 3 Compared with Example 4, Comparative Example 3 used the antibacterial layer fabric prepared in Comparative Example 1 in the process of preparing the layered composite fabric based on the anti-UV coating, while keeping other conditions unchanged.

[0031] Comparative Example 4 Compared with Example 4, Comparative Example 4 used the antibacterial layer fabric prepared in Comparative Example 2 in the process of preparing the layered composite fabric based on the anti-UV coating, while keeping other conditions unchanged.

[0032] Comparative Example 5 Compared with Example 4, Comparative Example 5 used surface-modified ZIF-L hybrid nanomaterials instead of functional fillers in the preparation of the UV-resistant emulsion, while other conditions remained unchanged.

[0033] Comparative Example 6 Compared with Example 4, Comparative Example 6 did not add zirconium oxychloride during the preparation of ZIF-L hybrid nanomaterials, while all other conditions remained unchanged.

[0034] Comparative Example 7 Compared with Example 4, Comparative Example 7 used a modifier instead of a functional filler in the preparation of the UV-resistant emulsion, while all other conditions remained unchanged.

[0035] In the above examples and comparative examples, the polyester masterbatch, model CB-608S, was provided by Shandong Shoucheng Chemical Co., Ltd.; the mineral oil defoamer, with a pH value of 6.9 and a viscosity of 155 mPa·s, was provided by Hejian Baikeda Chemical Building Materials Co., Ltd.; the white oil, model FG 15, was provided by Yihao (Shanghai) Chemical Technology Co., Ltd.; the polyacrylamide, model LX-3610, was provided by Henan Junfa Chemical Co., Ltd.; Tween-20, CAS number 9005-64-5, was provided by Wuhan Beileye Biomedical Technology Co., Ltd.; the acrylic emulsion, with a solid content of 45-47%, product number HH0250XJGJKX, was provided by Luoyang Yiyuan New Materials Co., Ltd.; and the commercially available nano-silver, with an average particle size of 150 nm, was provided by Suzhou Lengshi Nanomaterials Technology Co., Ltd.

[0036] Experimental Example Performance tests were conducted on the layered composite fabrics based on anti-UV coatings prepared in Examples 2-4 and Comparative Examples 3-7: I. UV protection performance test: UPF (ultraviolet protection factor) test was conducted in accordance with standard GB / T 18830-2009, with sample size 5cm×5cm; II. Waterproof performance test: The waterproof performance test was conducted in accordance with the standard GB / T 4744-2013. III. Antibacterial performance test: The antibacterial effect of each group of fabric samples against Staphylococcus aureus and Escherichia coli was tested in accordance with the standard GB / T 20944.3-2008. IV. Mosquito repellent performance test: Refer to standard GB / T 30126 Avoidance rate testing was conducted in 2013.

[0037] The test results are shown in Table 1: Table 1

[0038] As can be seen from the test results in Table 1, the layered composite fabric based on the anti-ultraviolet coating prepared in Examples 2-4 of the present invention not only has excellent sun protection and waterproof performance and antibacterial performance, but also has a good mosquito repellent effect. As can be seen from the comparison between Comparative Example 3 and Example 4, the nano-silver prepared by the present invention, compared with commercially available nano-silver, retains secondary metabolites from natural lemon leaf extract, such as flavonoids, terpenoids and phenolic compounds. These flavonoids, terpenoids and phenolic compounds synergistically enhance the antibacterial and mosquito-repellent effects of nano-silver. As can be seen from the comparison between Comparative Example 4 and Example 4, when coumaric acid is grafted onto surface-modified nano-silver, coumaric acid and its esters have excellent antibacterial and mosquito-repellent properties. In addition, the chromophore group (-COOH) in coumaric acid exhibits excellent ultraviolet absorption performance in the wavelength range of 200-400nm. Therefore, modified nano-silver not only has good antibacterial and mosquito-repellent effects, but also has a certain degree of anti-ultraviolet sun protection effect. Furthermore, compared with nano-silver, modified nano-silver has better interfacial compatibility with the polyester matrix. Therefore, the antibacterial layer fabric containing modified nano-silver has better antibacterial, mosquito-repellent and sun protection properties. As can be seen from the comparison between Comparative Example 5 and Example 4, grafting the surface-modified ZIF-L hybrid nanomaterials with a modifier and 1-chlorohexane imparts better antibacterial and waterproof / sunscreen properties to the sunscreen layer fabric. This is because the modifier contains carboxyl groups, benzene rings, pyridine rings, trifluoromethyl groups, and Schiff base bonds. Among them, the benzene rings and pyridine rings exhibit anti-UV sunscreen function by forming a conjugated system, the trifluoromethyl group has good hydrophobic and waterproof properties and anti-UV properties, and the Schiff base bonds have certain antibacterial properties. The introduction of hydrophobic alkyl chains by 1-chlorohexane further improves the waterproof performance of the functional filler compared with the grafted modified ZIF-L hybrid nanomaterials.

[0039] As can be seen from the comparison between Comparative Example 6 and Example 4, during the growth of zirconium-doped nano-cerium oxide, the larger cerium ions in cerium oxide are replaced by smaller zirconium ions, resulting in lattice shrinkage and deformation, which promotes the formation of oxygen vacancies. Due to its suitable band gap (3.1 eV), cerium oxide can absorb ultraviolet rays, and the formation of oxygen vacancies gives zirconium-doped nano-cerium oxide better anti-ultraviolet sun protection performance. Therefore, fabrics containing zirconium-doped nano-cerium oxide have better sun protection performance. As can be seen from the comparison between Comparative Example 7 and Example 4, the UV-resistant emulsion of the present invention contains functional fillers, including ZIF-L hybrid nanomaterials with zirconium-doped cerium oxide nanoparticles on the surface, and modifiers and 1-chlorohexane grafted onto the ZIF-L hybrid nanomaterials. The ZIF-L hybrid nanomaterials combine the advantages of polydopamine-modified ZIF-L and cerium oxide, exhibiting excellent antibacterial, waterproof, sun-protective, and flame-retardant properties. Furthermore, polydopamine-modified ZIF-L can serve as a dispersion platform for cerium oxide, promoting its uniform dispersion in the polymer matrix. In addition, the production of zirconium-doped cerium oxide nanoparticles further extends the water's path, giving the ZIF-L hybrid nanomaterials better waterproof performance. Therefore, the presence of ZIF-L hybrid nanomaterials in the functional fillers has a significant impact on the antibacterial, waterproof, and sun-protective properties of the sun-protective layer fabric.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a layered composite fabric based on an anti-UV coating, characterized in that, Includes the following steps: Step 1: Zirconium-doped cerium oxide nanoparticles are grown in situ on the surface of polydopamine-modified ZIF-L, and then the surface is modified with silane coupling agent KH-560 to obtain surface-modified ZIF-L hybrid nanomaterials; wherein, the polydopamine-modified ZIF-L is obtained by polymerizing dopamine on the surface of ZIF-L. Step 2: 5-Formylnicotinic acid reacts with 2,2-bis(4-aminophenyl)hexafluoropropane to obtain a modifier; the surface-modified ZIF-L hybrid nanomaterials are then treated with the modifier and 1-chlorohexane to obtain a functional filler. Step 3: Mix acrylic emulsion, deionized water, functional filler, and additives to obtain an anti-UV emulsion; use the anti-UV emulsion to impregnate and pad polyacrylonitrile base fabric to form an anti-UV coating on the polyacrylonitrile base fabric, thereby obtaining a sunscreen layer fabric. Step 4: Lay the layers together in the following order from bottom to top: polyester base fabric, antibacterial fabric, and sun-protective fabric, to obtain a layered composite fabric based on an anti-UV coating.

2. The method for preparing the layered composite fabric based on the anti-UV coating according to claim 1, characterized in that, In step one, the preparation method of the surface-modified ZIF-L hybrid nanomaterial is as follows: Under stirring, polydopamine-modified ZIF-L, cerium nitrate hexahydrate, zirconium oxychloride, polyvinylpyrrolidone, and an aqueous ethanol solution were mixed in a mass ratio of (2-3):(2.07-3.31):(1.61-2.57):(8-13.8):(350-550). The pH of the reaction mixture was adjusted to 8, and the mixture was subjected to hydrothermal reaction at 190-210℃ for 2.5-3.5 h. The product was purified to obtain ZIF-L hybrid nanomaterials. 25wt% ammonia, deionized water, and ethanol were mixed in a volume ratio of 0.7:10:30 to obtain a mixed solvent. ZIF-L hybrid nanomaterials were added to the mixed solvent and sonicated. Silane coupling agent KH-560 and ethanol were added, and the mixture was heated to 58-62℃ for 100-150 min with stirring. The product was purified to obtain surface-modified ZIF-L hybrid nanomaterials. The mass ratio of the ZIF-L hybrid nanomaterials, mixed solvent, silane coupling agent KH-560, and ethanol was (2-3):(140-210):(0.1-0.5):(32-48).

3. The method for preparing the layered composite fabric based on the anti-UV coating according to claim 1, characterized in that, In step one, the preparation method of the polydopamine-modified ZIF-L is as follows: At 23-25℃, a 3.85wt% zinc nitrate aqueous solution was added to an equal volume of a 9.91wt% 2-methylimidazole aqueous solution, and the mixture was stirred at 600-700 r / min for 1.5-2.5 h to purify the solution and obtain ZIF-L. Dopamine hydrochloride, Tris-HCl buffer, and ethanol were mixed at a mass ratio of (0.18-0.2):(150-180):(40-50) to obtain a modified solution. ZIF-L was added to the modified solution for soaking and treatment, and stirred at 24-26℃ for 20-28 h to purify the product, thereby obtaining polydopamine-modified ZIF-L. The mass ratio of ZIF-L to the modified solution was (5-8):(50-70).

4. The method for preparing the layered composite fabric based on the anti-UV coating according to claim 1, characterized in that, In step two, the preparation method of the functional filler is as follows: 5-Formylnicotinic acid, 2,2-bis(4-aminophenyl)hexafluoropropane and N,N-dimethylformamide were mixed in a mass ratio of (3-6):(3.7-7.1):(80-120), heated to 70-80℃, stirred for 3-5 h, and the product was purified to obtain the modifier. Surface-modified ZIF-L hybrid nanomaterials were added to N,N-dimethylformamide, along with a modifier, triethylamine, and hydroquinone. After the acid value of the reaction system remained unchanged, the mixture was purified to obtain grafted modified ZIF-L hybrid nanomaterials. The mass ratio of the surface-modified ZIF-L hybrid nanomaterials, N,N-dimethylformamide, modifier, triethylamine, and hydroquinone was (2-3):(120-150):(4.7-7.5):(0.02-0.04):(0.01-0.03). The grafted modified ZIF-L hybrid nanomaterials were added to ethanol, sonicated, and then 1-chlorohexane was added. The mixture was stirred at 23-27℃ for 5-7 hours, and the product was purified to obtain the functional filler. The mass ratio of the grafted modified ZIF-L hybrid nanomaterials, ethanol and 1-chlorohexane was (2-3):(80-100):(1.2-2.6).

5. The method for preparing the layered composite fabric based on the anti-UV coating according to claim 1, characterized in that, In step three, the UV-resistant emulsion comprises, by weight, 100 parts acrylic emulsion, 150-200 parts deionized water, 16-38 parts functional filler, and 11.8-26.1 parts additives.

6. The method for preparing the layered composite fabric based on the anti-UV coating according to claim 1, characterized in that, In step three, the roll residue of the dip-rolling treatment is 50-80%, and the baking conditions are: baking temperature of 150-170℃ and baking time of 1-3 minutes.

7. The method for preparing the layered composite fabric based on the anti-UV coating according to claim 1, characterized in that, In step four, the layers of the layered composite fabric based on the anti-UV coating are bonded together by polyurethane hot melt adhesive.

8. The method for preparing the layered composite fabric based on the anti-UV coating according to claim 1, characterized in that, In step four, the method for preparing the antibacterial layer fabric is as follows: Step S1: Boil lemon leaf powder in distilled water for 5-10 minutes, then filter to obtain lemon leaf water extract; mix lemon leaf water extract and 20mM silver nitrate aqueous solution at a volume ratio of (5-10):(50-90), and continuously stir and react for 2-3 hours under dark conditions at 25-28℃. During the reaction, maintain the pH value of the reaction system at 7.5-8.0, purify the product, and obtain nano-silver with a particle size of 100-245nm. Step S2: Add silane coupling agent KH-550 hydrolysate to a 2.5-10 wt% nano-silver ethanol dispersion, stir for 20-40 min, and react at 60-80℃ for 4-6 h. Purify the product to obtain surface-modified nano-silver; wherein the mass ratio of silane coupling agent KH-550 to nano-silver is (0.01-0.02):

1. Surface-modified nano-silver was added to ethanol, then coumaric acid was added, and the mixture was stirred at 20-30℃ for 1-3 hours. The product was purified to obtain modified nano-silver. The mass ratio of the surface-modified nano-silver, ethanol and coumaric acid was (3-4):(120-150):(1.4-2.8). Step S3: Mix modified nano-silver and polyester masterbatch at a mass ratio of (75-95):(5-25), and melt spin at 230-250℃ to obtain modified polyester fiber; blend polyester fiber and modified polyester fiber at a mass ratio of (30-60):(40-70) to form yarn, and knit to obtain antibacterial layer fabric.

9. A layered composite fabric based on an anti-ultraviolet coating, prepared by the method for preparing a layered composite fabric based on an anti-ultraviolet coating as described in any one of claims 1-8.

10. The application of the layered composite fabric based on the anti-UV coating according to claim 9 in sunshade fabrics.

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