Toughening film composite fabric and preparation method thereof

Abstract

The invention discloses a toughened film composite fabric and a preparation method thereof, and relates to the technical field of fabrics. The fabric provided by the invention adopts a unique three-layer structural design, and comprises a layer of elastic film, a layer of gel layer and a layer of base material cloth. The composite structure enables the fabric to have various excellent functional characteristics. Firstly, due to the existence of the elastic film and the gel layer, the fabric is endowed with good elastic performance, so that the fabric can adapt to various different wearing requirements, and comfortable wearing experience is provided. And secondly, the elastic film ensures the waterproofness and ultraviolet resistance of the fabric, and the elastic film and the gel layer form a moisture permeable composite layer. According to the fabric, through ingenious combination of the three layers of structures, the multiple effects of water resistance, moisture permeability and elasticity are achieved, and new possibility is provided for application of modern textiles.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and specifically to a toughened film composite fabric and a preparation method thereof. Background Art

[0002] In today's market, thermoplastic elastomer toughened film composite fabrics have attracted much attention due to their unique properties. Such fabrics can not only maintain good waterproof performance while significantly improving the mechanical properties of the fabrics, thus greatly expanding their application scope. However, most of the thermoplastic elastomer toughened film composite fabrics on the market currently adopt a lamination composite technology to composite the fabric with a thermoplastic elastomer film. In this composite process, adhesives are usually added to ensure the tight combination of the fabric and the film. However, the use of such adhesives also brings a problem, that is, the moisture permeability of the thermoplastic elastomer toughened film composite fabric is relatively poor. This has limited its use in some application scenarios that require high moisture permeability to a certain extent. Therefore, how to improve the moisture permeability of the thermoplastic elastomer toughened film composite fabric while maintaining its mechanical properties and waterproof performance has become an urgent problem to be solved in the field of thermoplastic elastomer toughened film composite fabrics. Summary of the Invention

[0003] The purpose of the present invention is to provide a toughened film composite fabric and a preparation method thereof to solve the problems existing in the prior art.

[0004] To solve the above technical problems, the present invention provides the following technical solutions: A toughened film composite fabric includes an elastic film, a gel layer, and a base fabric layer. The elastic film is prepared by electrospinning onto the gel layer from a casting solution obtained by mixing anti-ultraviolet modified polyvinylidene fluoride and poly(1,5-hexanediol acrylate).

[0005] The gel layer is prepared by mixing polyvinyl alcohol, acrylamide, and diallyldimethylammonium chloride to obtain a hydrogel, and then coating it on the surface of the base fabric layer.

[0006] The base fabric layer is woven from cross-shaped cross-section PTT fibers and cotton fibers in a mass ratio of 40:60.

[0007] Further, the grammage of the base fabric layer is 120 - 200 g / m 2 .

[0008] Further, the thickness of the elastic film is 5 - 10 μm.

[0009] Further, the toughened film composite fabric includes the following preparation steps:

[0010] (1) Dissolve 10 - 40 g of polyvinyl alcohol with a molecular weight of 5000 - 145000 and 80 - 200 g of water in a water bath at 60 - 90 °C and stir for 2 h to obtain a polyvinyl alcohol solution. Add 2 - 15 g of β-cyclodextrin, 10 - 25 g of acrylamide, and 2 - 8 g of diallyldimethylammonium chloride. After stirring evenly, add 0.26 g of ammonium persulfate and continue to keep the temperature at 60 - 90 °C in the water bath for reaction for 1 - 4 h to obtain a viscous hydrogel;

[0011] (2) After the base fabric is alkali-treated, coat the hydrogel on its surface with a coating thickness of 0.3 - 2.5 mm to obtain a gel fabric;

[0012] (3) Alkalized polyvinylidene fluoride resin is dissolved in a solvent to prepare a 25% solution. Add an ultraviolet shielding material, and while stirring at 400 r / min, add benzoyl peroxide to the solution and continue stirring for 2 h to obtain a modified polyvinylidene fluoride solution; the mass ratio of alkalized polyvinylidene fluoride resin, ultraviolet shielding material, and benzoyl peroxide is 10:1 - 3:0.2;

[0013] (4) Mix the modified polyvinylidene fluoride solution and poly(1,5-hexanediol acrylate). The mass ratio of poly(1,5-hexanediol acrylate) to alkalized polyvinylidene fluoride resin is 1:10. Among them, poly(1,5-hexanediol acrylate) is prepared by polymerizing 1,5-hexanediol and acrylate in a molar ratio of 1:5. After stirring and dissolving, inject the solution into a nozzle through a liquid supply system at a liquid supply speed of 10 mL / h. Use the gel fabric as the receiving substrate. The distance from the receiving substrate to the spinneret is 50 cm, and the applied voltage is 100 kV. Electrospinning is carried out towards the gel layer side. At the same time, a mixed gas flow of air and ethanol vapor is blown from two directions to the electrospinning jet and the fabric to realize the microporosity of the polyvinylidene fluoride membrane and lay a foundation for the transformation of the hydrogel into an aerogel. After electrospinning is completed, bake at 90 - 100 °C for 30 min and then bake at 120 - 130 °C for 120 s. After baking is completed, the hydrogel is transformed into an aerogel, and the solvent in the hydrogel volatilizes, leaving pores, which helps to improve the moisture permeability, to obtain a toughened thin film composite fabric.

[0014] Further, the solvent in step (3) is acetone.

[0015] Further, the ultraviolet shielding material in step (3) is prepared by mixing porous silicon nitride and porous titanium dioxide in a mass ratio of 2:1 and reacting with methacryloxymethyltrimethoxysilane at 70 - 80 °C for 4 - 6 h.

[0016] Further, the porosity of the porous silicon nitride and porous titanium dioxide is 5 - 50%, and the average pore diameter is 10 - 500 nm.

[0017] Further, the volume fraction of ethanol vapor in the mixed gas stream in step (4) is 40%.

[0018] Further, in step (4), the first direction is that the blowing port of the mixed gas stream forms a 45° angle with the electrospinning jet, and the blowing speed is 50 m / s. The second direction is that the blowing port of the mixed gas stream forms a 90° angle with the side without the coated gel layer, and the blowing speed is 20 m / s.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0020] The fabric involved in the present invention adopts a unique three-layer structure design, including an elastic membrane, a gel layer, and a base fabric. This composite structure endows the fabric with various excellent functional characteristics. The elastic membrane of the present invention is mainly composed of anti-ultraviolet modified polyvinylidene fluoride and supplemented by poly(1,5-hexanediol acrylate) to construct a casting solution, and a microporous membrane is prepared. The poly(1,5-hexanediol acrylate) elastomer has good compatibility with polyvinylidene fluoride molecules, can toughen and modify the polyvinylidene fluoride membrane, thereby obtaining an elastic membrane, improving the elastic properties of the fabric. Moreover, poly(1,5-hexanediol acrylate) contains a certain amount of hydroxyl groups, thus realizing the amphiphilicity of the elastic membrane, which can adsorb water vapor transferred from the gel layer and the base fabric. The water vapor is liquefied when it meets cold and remains at the contact surface of the elastic membrane and the gel. When the external temperature rises, the liquefied water further evaporates, realizing the moisture permeability effect. In addition, poly(1,5-hexanediol acrylate) has good compatibility with polyvinylidene fluoride molecules, can "anchor" poly(1,5-hexanediol acrylate) on the membrane surface, play a certain role in adjusting the micropores of the elastic membrane, prevent the micropores from being too large and destroying the original waterproof effect, and ensure that the finally prepared microporous membrane can prevent the entry of water droplets and ensure the discharge of water vapor molecules, realizing the waterproof and moisture-permeable effect. Specific embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] In order to more clearly illustrate the method provided by the present invention, the following examples and comparative examples are used for detailed description. The test methods for each index of the fabrics prepared in the following examples and comparative examples are as follows:

[0023] Elasticity: According to the test method for the tensile elastic recovery rate of knitted fabrics FZ / T 70006-2004, the Nantong Hongda HD026N electronic fabric strength tester was used to test the examples and comparative examples.

[0024] Moisture permeability: The fabrics obtained from each example and comparative example were respectively sealed on water cups containing the same amount of water, and the moisture permeability after 1 hour of testing the specimens was measured according to GB / T 12704.

[0025] Waterproof: Refer to GB / T 4745-2012.

[0026] Sun protection performance test: The fabrics prepared in the examples and comparative examples were tested for the ultraviolet protection factor (UPF). The national standard for testing was GB / T 18830-2009 Evaluation of ultraviolet protection performance of textiles. The fabrics were respectively cut into specimens with a size of 5 mm×5 mm, and a UV-Vis spectrometer Lambda35 was used to test the specimens. Among them, the scanning range of the set wavelength was 200-400 nm, and the scanning wavelength interval was 1 nm.

[0027] Example 1

[0028] (1) 10 g of polyvinyl alcohol with a molecular weight of 5000 and 80 g of water were stirred in a water bath at 60 °C for 2 h to obtain a polyvinyl alcohol solution. Then, 2 g of β-cyclodextrin, 10 g of acrylamide, and 2 g of diallyldimethylammonium chloride were added, and after stirring evenly, 0.26 g of ammonium persulfate was added. The reaction was continued in a water bath at 60 °C for 2 h to obtain a viscous hydrogel.

[0029] (2) 10 g of deionized water, 80 g of sodium hydroxide solution with a mass concentration of 10%, and 0.01 g of accelerator 1227 were placed in a flask and stirred and dispersed to prepare a pretreatment solution. The base fabric was soaked in the pretreatment solution at a bath ratio of 1:20, impregnated at 60 °C for 5 min, subjected to oscillating reaction, washed with water, and dried to obtain a pretreated fabric. The hydrogel was coated on its surface with a coating thickness of 1.0 mm to obtain a gel fabric.

[0030] (3) Sodium hydroxide was added to deionized water and stirred until completely dissolved. Then, potassium permanganate was added and stirring was continued until potassium permanganate was completely dissolved to prepare an alkalization solution. Polyvinylidene fluoride resin with a molecular weight of 1×10 6 was added to the alkalization solution, and the mixture was heated in a water bath. The alkalization temperature was 70 °C and the alkalization time was 10 h. After the alkalization was completed, the alkalized polyvinylidene fluoride resin was washed with deionized water multiple times until the washing water was neutral. Finally, the alkalized and washed polyvinylidene fluoride resin was placed in a constant temperature drying oven at 60 °C and dried for 12 h to obtain alkalized polyvinylidene fluoride resin; the mass ratio of polyvinylidene fluoride resin:sodium hydroxide:potassium permanganate:deionized water was 5:6:2:50.

[0031] (4) Porous silicon nitride and porous titanium dioxide are mixed at a mass ratio of 2:1 and added to a mixed solution of absolute ethanol, methacryloxymethyltrimethoxysilane and water (mass ratio of 7:2:1) to prepare a solid dispersion with a mass fraction of 1%. Stir for 10 min, ultrasonically disperse for 20 min, and keep the temperature at 70 °C in an oil bath and stir mechanically at 800 r / min. Keep the temperature for reaction for 6 h. After the reaction, filter and wash, and place the product in a vacuum drying oven at 80 °C for drying for 8 h to obtain an ultraviolet shielding material;

[0032] (5) Alkalized polyvinylidene fluoride resin is dissolved in acetone to prepare a solution with a concentration of 25%. Add the ultraviolet shielding material, and while stirring at 400 r / min, add benzoyl peroxide to the solution and continue stirring for 2 h to obtain a modified polyvinylidene fluoride solution; the mass ratio of alkalized polyvinylidene fluoride resin, ultraviolet shielding material, and benzoyl peroxide is 10:1:0.2;

[0033] (6) Mix the modified polyvinylidene fluoride solution and poly(1,5-hexanediol acrylate). The mass ratio of poly(1,5-hexanediol acrylate) and alkalized polyvinylidene fluoride resin is 1:10. After stirring and dissolving, pour the solution into a nozzle through a feeding system. The feeding speed is 10 mL / h. Use the gel fabric as the receiving substrate. The distance from the receiving substrate to the spinneret is 50 cm. The applied voltage is 100 kV. Electrospinning is carried out towards the gel layer side. At the same time, a mixed gas flow of air and ethanol vapor is blown from two directions to the electrospinning jet and the fabric. The first direction is that the mixed gas blowing port forms a 45° angle with the electrospinning jet, and the blowing speed is 50 m / s. The second direction is that the mixed gas blowing port forms a 90° angle with the side without the coated gel layer, and the blowing speed is 20 m / s. The volume fraction of ethanol vapor in the mixed gas flow is 40%. After electrospinning, bake at 90 °C for 30 min and bake at 120 °C for 120 s to obtain a toughened thin film composite fabric.

[0034] Example 2

[0035] (1) 25 g of polyvinyl alcohol with a molecular weight of 75000 and 100 g of water are stirred in a water bath at 80 °C for 2 h to obtain a polyvinyl alcohol solution. Add 7 g of β-cyclodextrin, 10 g of acrylamide, and 2 g of diallyldimethylammonium chloride. After stirring evenly, add 0.26 g of ammonium persulfate and continue to keep the temperature in the water bath at 80 °C for reaction for 2 h to obtain a viscous hydrogel;

[0036] (2) Weigh 10 g of deionized water, 80 g of sodium hydroxide solution with a mass concentration of 10%, and 0.01 g of accelerator 1227 and place them in a flask, stir and disperse to obtain a pretreatment solution; take the base fabric and soak it in the pretreatment solution at a bath ratio of 1:20, impregnate it at 60 °C for 5 min, carry out oscillating reaction, wash with water and dry to obtain a pretreated fabric, coat a hydrogel on its surface with a coating thickness of 1.0 mm to obtain a gel fabric;

[0037] (3) Add sodium hydroxide to deionized water, stir until completely dissolved, then add potassium permanganate and continue to stir until potassium permanganate is completely dissolved to obtain an alkalization solution; add polyvinylidene fluoride resin with a molecular weight of 1×10 6 to the alkalization solution, heat it in a water bath, the alkalization temperature is 70 °C, the alkalization time is 10 h, after the alkalization is completed, wash the alkalized polyvinylidene fluoride resin with deionized water multiple times until the washing water is neutral; finally, place the alkalized and washed polyvinylidene fluoride resin in an oven at 60 °C and dry it for 12 h to obtain alkalized polyvinylidene fluoride resin; the mass ratio of polyvinylidene fluoride resin:sodium hydroxide:potassium permanganate:deionized water is 5:6:2:50;

[0038] (4) Mix porous silicon nitride and porous titanium dioxide according to a mass ratio of 2:1, add them to a mixed solution of anhydrous ethanol, methacryloxymethyltrimethoxysilane and water (mass ratio of 7:2:1), and prepare a solid dispersion with a mass fraction of 1%, stir for 10 min, ultrasonically disperse for 20 min, under the conditions of a constant temperature oil bath at 70 °C and mechanical stirring at 800 r / min, keep the temperature and react for 6 h, after the reaction is completed, filter and wash, and place the product in a vacuum drying oven at 80 °C and dry for 8 h to obtain an ultraviolet shielding material;

[0039] (5) Dissolve the alkalized polyvinylidene fluoride resin in acetone to prepare a solution with a concentration of 25%, add the ultraviolet shielding material, under stirring at 400 r / min, then add benzoyl peroxide to the solution and continue to stir for 2 h to obtain a modified polyvinylidene fluoride solution; the mass ratio of alkalized polyvinylidene fluoride resin:ultraviolet shielding material:benzoyl peroxide is 10:2:0.2;

[0040] (6) Mix the modified polyvinylidene fluoride solution with poly(1,5 - hexanediol acrylate). The mass ratio of poly(1,5 - hexanediol acrylate) to the alkalized polyvinylidene fluoride resin is 1:10. After stirring until dissolved, pour the solution into the nozzle through the liquid supply system. The liquid supply speed is 10 mL / h. Use the gel fabric as the receiving substrate. The distance from the receiving substrate to the spinneret is 50 cm. Apply a voltage of 100 kV and perform electrospinning towards the gel layer side. At the same time, blow the electrospinning jet and the fabric from two directions with a mixed gas flow of air and ethanol vapor. The first direction is that the mixed gas blowing port forms a 45° angle with the electrospinning jet, and the blowing speed is 50 m / s. The second direction is that the mixed gas blowing port forms a 90° angle with the side without the coated gel layer, and the blowing speed is 20 m / s. The volume fraction of ethanol vapor in the mixed gas is 40%. After electrospinning is completed, bake at 95 °C for 30 min and then bake at 125 °C for 120 s to obtain the toughened thin - film composite fabric.

[0041] Example 3

[0042] (1) Mix 40 g of polyvinyl alcohol with a molecular weight of 145000 and 150 g of water in a 90 °C water bath and stir for 2 h to obtain a polyvinyl alcohol solution. Add 15 g of β - cyclodextrin, 25 g of acrylamide, and 8 g of diallyldimethylammonium chloride. After stirring evenly, add 0.26 g of ammonium persulfate and continue to keep warm and react in a 90 °C water bath for 1 - 4 h to obtain a viscous hydrogel.

[0043] (2) Weigh 10 g of deionized water, 80 g of a 10% sodium hydroxide solution, and 0.01 g of accelerator 1227 and place them in a flask, stir and disperse to prepare a pretreatment solution. Take the base fabric and soak it in the pretreatment solution at a bath ratio of 1:20, impregnate it at 60 °C for 5 min, perform oscillating reaction, wash with water and dry to obtain the pretreated fabric. Coat the hydrogel on its surface with a coating thickness of 1.0 mm to obtain the gel fabric.

[0044] (3) Add sodium hydroxide to deionized water, stir until completely dissolved, then add potassium permanganate and continue to stir until potassium permanganate is completely dissolved to prepare an alkalizing solution. Add the polyvinylidene fluoride resin with a molecular weight of 1×10 6 to the alkalizing solution, heat it in a water bath, the alkalizing temperature is 70 °C, and the alkalizing time is 10 h. After the alkalizing is completed, wash the alkalized polyvinylidene fluoride resin with deionized water multiple times until the washing water is neutral. Finally, place the alkalized and washed - clean polyvinylidene fluoride resin in a 60 °C constant - temperature drying oven and dry it for 12 h to obtain the alkalized polyvinylidene fluoride resin. The mass ratio of polyvinylidene fluoride resin:sodium hydroxide:potassium permanganate:deionized water is 5:6:2:50.

[0045] (4) Porous silicon nitride and porous titanium dioxide are mixed at a mass ratio of 2:1 and added to a mixed solution of anhydrous ethanol, methacryloxymethyltrimethoxysilane and water (mass ratio of 7:2:1) to prepare a solid dispersion with a mass fraction of 1%. Stir for 10 min, ultrasonically disperse for 20 min, and under the conditions of a constant temperature oil bath at 70 °C and mechanical stirring at 800 r / min, keep the temperature for reaction for 6 h. After the reaction is completed, filter and wash, and place the product in a vacuum drying oven at 80 °C for drying for 8 h to obtain an ultraviolet shielding material;

[0046] (5) Alkalized polyvinylidene fluoride resin is dissolved in acetone to prepare a solution with a concentration of 25%. Add the ultraviolet shielding material, and under stirring at 400 r / min, add benzoyl peroxide to the solution and continue stirring for 2 h to obtain a modified polyvinylidene fluoride solution; the mass ratio of alkalized polyvinylidene fluoride resin, ultraviolet shielding material, and benzoyl peroxide is 10:3:0.2;

[0047] (6) Mix the modified polyvinylidene fluoride solution and poly(1,5-hexanediol acrylate). The mass ratio of poly(1,5-hexanediol acrylate) to alkalized polyvinylidene fluoride resin is 1:10. After stirring and dissolving, pour the solution into a nozzle through a liquid supply system. The liquid supply speed is 10 mL / h. Use the gel fabric as the receiving substrate. The distance from the receiving substrate to the spinneret is 50 cm. The applied voltage is 100 kV. Electrospinning is carried out towards the gel layer side. At the same time, a mixed gas flow of air and ethanol vapor is blown from two directions to the electrospinning jet and the fabric. The first direction is that the mixed gas flow blowing port forms a 45° angle with the electrospinning jet, and the blowing speed is 50 m / s. The second direction is that the mixed gas flow blowing port forms a 90° angle with the side without the coated gel layer, and the blowing speed is 20 m / s. The volume fraction of ethanol vapor in the mixed gas flow is 40%. After electrospinning is completed, bake at 100 °C for 30 min and bake at 130 °C for 120 s to obtain a toughened film composite fabric.

[0048] Comparative Example 1

[0049] The difference between Comparative Example 1 and Example 3 lies in step (1). Modify step (1) as follows: Polyvinyl alcohol and an organic solvent are heated and dissolved at 120 °C to obtain a polyvinyl alcohol solution. The organic solvent is a blended solvent of dimethyl sulfoxide and N-N-dimethylformamide, wherein the volume ratio of dimethyl sulfoxide to N-N-dimethylformamide is 1; the mass concentration of the obtained polyvinyl alcohol solution is 20%, and then let it stand and cool to room temperature to form a gel; the remaining steps are the same as those in Example 3.

[0050] Comparative Example 2

[0051] The difference between Comparative Example 2 and Example 3 is that no ultraviolet shielding material is added, and the remaining steps are the same as those in Example 3.

[0052] Comparative Example 3

[0053] The difference between Comparative Example 3 and Example 3 is that poly(1,5 - hexanediol acrylate) is not added, and the remaining steps are the same as those in Example 3.

[0054] Effect Example

[0055] The following Table 1 shows the performance analysis results of the fabrics using Examples 1 - 3 and Comparative Examples 1 - 3 of the present invention.

[0056] Table 1

[0057]

[0058] The fabric involved in the present invention adopts a unique three - layer structure design, including an elastic membrane, a gel layer, and a base fabric. This composite structure endows the fabric with various excellent functional characteristics. Firstly, the presence of the elastic membrane and the gel layer gives the fabric good elastic properties, enabling it to adapt to various different wearing needs and providing a comfortable wearing experience. Secondly, the elastic membrane ensures the waterproof and anti - ultraviolet properties of the fabric, and together with the gel layer, a moisture - permeable composite layer is constructed. Through the ingenious combination of the three - layer structure, the fabric of the present invention achieves multiple effects of waterproofing, moisture permeability, and elasticity, providing new possibilities for the application of modern textiles.

[0059] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above - mentioned 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, in any aspect, 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 included in the present invention. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A toughened film composite fabric, comprising an elastic film, a gel layer, and a base fabric layer, characterized in that, The elastic film is prepared by electrospinning onto a gel layer from a casting solution obtained by mixing ultraviolet-resistant modified polyvinylidene fluoride and poly(1,5-hexanediol acrylate). The gel layer is prepared by mixing polyvinyl alcohol, acrylamide, and diallyldimethylammonium chloride to obtain a hydrogel, which is then coated on the surface of the base fabric layer. The base fabric layer is woven from cross-shaped cross-section PTT fibers and cotton fibers in a mass ratio of 40:

60.

2. The toughened film composite fabric according to claim 1, wherein The basis weight of the base fabric layer is 120 to 200 g / m 2 .

3. The toughened film composite fabric according to claim 1, characterized in that, The thickness of the elastic film is 5 - 10 μm.

4. The preparation method of a toughened film composite fabric according to claim 1, characterized in that, It includes the following preparation steps: (1) Mix 10 - 40 g of polyvinyl alcohol with a molecular weight of 5000 - 145000 and 80 - 200 g of water in a water bath at 60 - 90 °C and stir for 2 h to obtain a polyvinyl alcohol solution. Add 2 - 15 g of β-cyclodextrin, 10 - 25 g of acrylamide, and 2 - 8 g of diallyldimethylammonium chloride. After stirring evenly, add 0.26 g of ammonium persulfate and continue to keep warm and react in a water bath at 60 - 90 °C for 1 - 4 h to obtain a viscous hydrogel. (2) After the base fabric is treated with alkali, coat the hydrogel on its surface with a coating thickness of 0.3 - 2.5 mm to obtain a gel fabric. (3) Alkalized polyvinylidene fluoride resin is dissolved in a solvent to prepare a 25% solution. Add an ultraviolet shielding material. Under stirring at 400 r / min, add benzoyl peroxide to the solution and continue stirring for 2 h to obtain a modified polyvinylidene fluoride solution. The mass ratio of alkalized polyvinylidene fluoride resin, ultraviolet shielding material, and benzoyl peroxide is 10:1 - 3:0.

2. (4) Mix the modified polyvinylidene fluoride solution and poly(1,5-hexanediol acrylate). The mass ratio of poly(1,5-hexanediol acrylate) to alkalized polyvinylidene fluoride resin is 1:

10. After stirring and dissolving, pour the solution into a nozzle through a liquid supply system at a liquid supply speed of 10 mL / h. Use the gel fabric as the receiving substrate. The distance from the receiving substrate to the spinneret is 50 cm, and the applied voltage is 100 kV. Electrospin towards the gel layer side. At the same time, blow the electrospinning jet and the fabric from two directions with a mixed gas flow of air and ethanol vapor. After electrospinning is completed, bake at 90 - 100 °C for 30 min and then bake at 120 - 130 °C for 120 s to obtain a toughened thin film composite fabric.

5. The preparation method of a toughened film composite fabric according to claim 4, characterized in that, The solvent in step (3) is acetone.

6. The preparation method of a toughened film composite fabric according to claim 4, wherein The ultraviolet shielding material in step (3) is prepared by mixing porous silicon nitride and porous titanium dioxide in a mass ratio of 2:1 and reacting with methacryloxymethyltrimethoxysilane at 70 - 80 °C for 4 - 6 h.

7. The preparation method of a toughened film composite fabric according to claim 4, characterized in that, The volume fraction of ethanol vapor in the mixed gas flow in step (4) is 40%.

8. The preparation method of a toughened thin film composite fabric according to claim 4, characterized in that, In step (4), the first direction is that the mixed gas flow blowing port forms a 45° angle with the electrospinning jet, and the blowing speed is 50 m / s. The second direction is that the mixed gas flow blowing port forms a 90° angle with the side without the coated gel layer, and the blowing speed is 20 m / s.

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