Anti-ultraviolet photochromic fabric and preparation process thereof

Abstract

The invention relates to the technical field of layered composite fabrics, in particular to an anti-ultraviolet photochromic fabric and a preparation process thereof. The anti-ultraviolet photochromic fabric comprises a double-layer structure of an inner-layer fabric and an outer-layer fabric, the inner-layer fabric is a skin-friendly fabric, the outer-layer fabric is a polyester fabric with an anti-ultraviolet photochromic function, the polyester fabric with the anti-ultraviolet photochromic function is prepared by dipping finishing and curing of a polyester fabric base cloth through a composite finishing agent, and the polyester fabric base cloth is a polyester fabric with an anti-ultraviolet photochromic function. The composite finishing agent comprises a photosensitive component and an anti-ultraviolet component, so that the anti-ultraviolet photochromic fabric can be endowed with a good photochromic effect and anti-ultraviolet performance, and meanwhile, the fabric also has good antistatic performance and antibacterial performance.

Description

Technical Field

[0001] This invention relates to the field of layered composite fabric technology, specifically to a UV-sensitive color-changing fabric and its preparation process. Background Technology

[0002] With the improvement of living standards, people's pursuit of clothing has gone beyond just warmth; they also increasingly demand comfort, safety, and aesthetics. The color of clothing is basically determined by the color of the fabric. Traditional fabrics generally do not change color; the color is determined by the dyeing process at the factory. However, due to the pursuit of fashion, this can become monotonous after prolonged wear. Therefore, a demand for color-changing fabrics has emerged. One trend is to use photosensitive color-changing materials to prepare finishing agents that alter the fabric's color when excited by a light source.

[0003] For example, Chinese patent application CN119459065A discloses a high-performance photosensitive color-changing composite fabric. This fabric consists of a longitudinal fiber layer, a waterproof layer, combed cotton, cooling fibers, and a photosensitive color-changing fiber layer. The photosensitive color-changing slurry is added to a spinning solution and spun into filaments, which are then spun with synthetic fibers to obtain the photosensitive color-changing fiber layer. A layer of ultraviolet absorber is then coated onto the surface of the photosensitive color-changing fiber layer to achieve the fabric's photosensitive color-changing and ultraviolet protection properties. The photosensitive color-changing slurry is composed of a thickener, binder, cellulose, photosensitive color-changing dye capsule powder, and water. However, when the ultraviolet absorber is coated onto the surface of the photosensitive color-changing fiber layer, there is a problem of poor adhesion, and the ultraviolet protection performance needs improvement. Furthermore, the fabric's antistatic and antibacterial properties also need to be improved. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a UV-resistant photosensitive color-changing fabric, thereby solving the problems that the UV protection, antistatic, and antibacterial properties of photosensitive color-changing fabrics in existing technologies need to be improved.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a UV-sensitive color-changing fabric, comprising an inner layer fabric and an outer layer fabric; the inner layer fabric is a skin-friendly fabric; the outer layer fabric comprises a polyester fabric with UV-sensitive color-changing function; the polyester fabric with UV-sensitive color-changing function is obtained by impregnating and curing a polyester fabric base with a composite finishing agent; the composite finishing agent is prepared by the following steps: Organic photosensitive monomers were prepared by reacting S1, cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane. S2, organic photosensitizing monomers, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomers are reacted to prepare a composite finishing agent.

[0006] Preferably, the skin-friendly fabric includes bamboo cotton fabric.

[0007] Preferably, in step S1, the preparation of the organic photosensitizing monomer specifically includes: adding cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane to diethyl ether, reacting, separating and drying after the reaction, and obtaining the organic photosensitizing monomer; wherein the molar ratio of cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane is 1:1:1, the amount of diethyl ether is 3-5 times the mass of amino-terminated polydimethylsiloxane, and the reaction is carried out under reflux at 40-50℃ for 8-12 hours.

[0008] Preferably, in step S2, the preparation of the composite finishing agent specifically includes: mixing an organic photosensitizing monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and an alkenyl-containing UV-resistant monomer to obtain a mixed monomer; adding a composite emulsifier to deionized water and stirring to obtain an emulsifier solution, dividing the emulsifier solution into a first part of the emulsifier solution and a second part of the emulsifier solution; adding an initiator to deionized water and stirring to obtain an initiator solution, dividing the initiator solution into a first part of the initiator solution and a second part of the initiator solution; in Under stirring conditions, the mixed monomers are added dropwise to the first part of the emulsifier solution, and stirring is continued to obtain a monomer pre-emulsion. The mixed monomers are then divided into a first part of the monomer pre-emulsion and a second part of the monomer pre-emulsion. The second part of the emulsifier solution is heated to a first set temperature, and the first part of the monomer pre-emulsion and the first part of the initiator solution are added to react. After the reaction is completed, the second part of the monomer pre-emulsion and the second part of the initiator solution are added dropwise, the temperature is raised to a second set temperature, and the reaction is continued. After the reaction is completed, the mixture is cooled to room temperature to obtain a mixed solution. A photoinitiator is added to the mixed solution, and the mixture is stirred to obtain a composite finishing agent.

[0009] Preferably, the mass ratio of the mixed monomer, composite emulsifier, and initiator is 100:(3-5):(0.5-1), and the reaction conditions are: reacting at a first set temperature for 30-60 min, and continuing the reaction at a second set temperature for 50-70 min; the first set temperature is 70-80℃, and the second set temperature is 85-90℃; the mixed monomer contains organic photosensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and... The mass ratio of the alkenyl-containing UV-resistant monomers is (126-152):(55-66):(59.6-71.5):(11.6-12.9):(8.7-9.1):(15.6-16); the composite emulsifier is composed of sodium dodecylbenzenesulfonate and AEO-9 in a mass ratio of 1:1; the initiator is potassium persulfate; the amount of photoinitiator added is 0.5%-1.5% of the mass of the mixture; the photoinitiator is lithium phenyl (2,4,6-trimethylbenzoyl) phosphate.

[0010] Preferably, when preparing the emulsifier solution, the mass ratio of the composite emulsifier to deionized water is 1:(20-30); when preparing the initiator solution, the mass ratio of the initiator to deionized water is 1:(30-50).

[0011] Preferably, the first part of the emulsifier solution accounts for 30%-50% of the total mass of the emulsifier solution, and the second part of the emulsifier solution accounts for 50%-70% of the total mass of the emulsifier solution; the first part of the initiator solution accounts for 25%-45% of the total mass of the initiator solution, and the second part of the initiator solution accounts for 55%-75% of the total mass of the initiator solution; the first part of the monomer preemulsion accounts for 15%-35% of the total mass of the monomer preemulsion, and the second part of the monomer preemulsion accounts for 65%-85% of the total mass of the monomer preemulsion.

[0012] Preferably, the alkenyl-modified nano-tungsten trioxide is prepared by the following steps: adjusting the pH of the ethanol aqueous solution to 3.5-4.5, adding γ-(methacryloyloxy)propyltrimethoxysilane (silane coupling agent KH570), stirring and hydrolyzing, adding nano-tungsten trioxide, reacting, filtering, washing, and drying after the reaction is completed to obtain alkenyl-modified nano-tungsten trioxide; wherein, the mass ratio of nano-tungsten trioxide, ethanol aqueous solution, and γ-(methacryloyloxy)propyltrimethoxysilane is 21.5:(200-300):(18-24), and the reaction conditions are reflux reaction at 75-85℃ for 2.5-3.5h.

[0013] Preferably, the alkenyl-modified nano zinc oxide is prepared by the following steps: adjusting the pH of the ethanol aqueous solution to 3.5-4.5, adding γ-glycidoxypropyltrimethoxysilane (silane coupling agent KH560), stirring and hydrolyzing, adding nano zinc oxide, reacting, filtering, washing, and drying after the reaction is complete to obtain epoxy-modified nano zinc oxide; wherein, the mass ratio of nano zinc oxide, ethanol aqueous solution, and γ-glycidoxypropyltrimethoxysilane is 8:(80-120):(6-10), and the reaction conditions are 75- The reaction was carried out under reflux at 85℃ for 2.5-3.5 h. 2-Allylphenol was dissolved in toluene, and epoxy-modified nano zinc oxide and N,N-dimethylbenzylamine were added. After the reaction was completed, the mixture was filtered, washed, and dried to obtain alkenyl-modified nano zinc oxide. The mass ratio of 2-allylphenol, toluene, epoxy-modified nano zinc oxide, and N,N-dimethylbenzylamine was (12-14):(150-250):(8-12):(1-2). The reaction conditions were reflux at 110-130℃ for 3-5 h under nitrogen protection.

[0014] Preferably, the alkenyl-containing UV-resistant monomer comprises 2-hydroxy-4-(methacryloyloxy)benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl-2H-benzotriazole; the molar ratio of 2-hydroxy-4-(methacryloyloxy)benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl-2H-benzotriazole is 1:1.

[0015] This invention also discloses a preparation process for the UV-sensitive color-changing fabric described above, comprising the following steps: Step 1: The polyester fabric base is impregnated in a composite finishing agent. After impregnation, it is light-cured, washed, and dried to obtain a polyester fabric with UV-sensitive color-changing function. Step 2: Use polyester fabric with UV protection and photosensitive color-changing function as the outer layer fabric and skin-friendly fabric as the inner layer fabric. Combine the outer layer fabric and the inner layer fabric to obtain UV protection and photosensitive color-changing fabric.

[0016] Preferably, when preparing the polyester fabric with UV-sensitive color-changing function, the mass ratio of polyester fabric base to composite finishing agent is 1:(10-20), the impregnation finishing is carried out at room temperature, with two dips and two nips, and the liquid retention rate is 80%-90%. The photocuring process includes: irradiating both sides of the polyester fabric base after impregnation finishing under blue light with a wavelength of 405nm for 30 minutes to carry out the curing reaction.

[0017] Preferably, the skin-friendly fabric includes bamboo cotton fabric.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The UV-sensitive color-changing fabric of the present invention comprises a double-layer structure of an inner layer fabric and an outer layer fabric. The inner layer fabric is a skin-friendly fabric, soft and gentle on the skin, while the outer layer fabric is a polyester fabric with UV-sensitive color-changing function. It is obtained by impregnating and curing the polyester fabric base in a composite finishing agent. The composite finishing agent includes photosensitive components and UV-resistant components, exhibiting good photosensitive color-changing effect and UV protection performance. The composite finishing agent of the present invention consists of organic photosensitive monomers, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing... Anti-UV monomers, as various polymerizing monomers, react under the action of an initiator to obtain polymers as effective components; nano-tungsten trioxide, as an inorganic photosensitizing component, has good photochromic effects; organic photosensitizing monomers, as organic photosensitizing components, are prepared by reacting cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane. The introduced cinnamyl group can serve as a chromophore in the organic photosensitizing monomer, enabling photochromism; Schiff base (-C=N-) groups are generated during the reaction of cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane. Schiff base compounds have unique optical, thermal, and electrical properties and can also serve as photochromic components. Color-changing materials; in addition, the introduction of organosiloxane molecular chains can improve the softness of polyester fabrics after impregnation and curing with composite finishing agents, and the generated Schiff base groups have good antibacterial properties, which can also improve the antibacterial performance of polyester fabrics; in this invention, the hydroxyl groups introduced on the hydroxyethyl acrylate monomer during the preparation of the composite finishing agent can improve the moisture absorption of polyester fabrics, thereby improving the antistatic properties of polyester fabrics; pentaerythritol triacrylate is a multifunctional monomer, and the polymer formed contains unreacted acrylate groups, which can enable the polymer molecules to react under the action of photoinitiators and light conditions on the surface of polyester fabrics. The cross-linking polymerization between the pores of the polyester fabric and the solidification to form a continuous film layer achieves the finishing modification of the polyester fabric base. The introduction of alkenyl-containing UV-resistant monomers can effectively improve the UV resistance of the fabric. The introduction of alkenyl-modified nano zinc oxide can improve the UV resistance and antibacterial properties of the fabric. In the preparation process of alkenyl-modified nano zinc oxide, the nano zinc oxide first reacts with γ-glycidoxypropyltrimethoxysilane to introduce epoxy groups, and then reacts with 2-allylphenol through the epoxy groups to introduce alkenyl groups that can participate in the polymerization reaction. The hydroxyl groups formed by the ring-opening reaction of the epoxy groups can further improve the antistatic properties of the polyester fabric. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the preparation of alkenyl-modified nano-zinc oxide by reacting epoxy-modified nano-zinc oxide with 2-allylphenol in Example 2 of the present invention. Figure 2This is a schematic diagram illustrating the preparation of organic photosensitive monomers by the reaction of cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane in this invention. Detailed Implementation

[0020] 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.

[0021] Example 1 This embodiment discloses a method for preparing alkenyl-modified nano-tungsten trioxide, comprising the following steps: adjusting the pH of a 95wt% ethanol aqueous solution to 4 with 1mol / L hydrochloric acid, adding γ-(methacryloyloxy)propyltrimethoxysilane, and hydrolyzing by stirring at 300r / min for 30min at room temperature, then adding nano-tungsten trioxide, wherein the mass ratio of nano-tungsten trioxide, 95wt% ethanol aqueous solution, and γ-(methacryloyloxy)propyltrimethoxysilane is 21.5:250:21, and refluxing at 80℃ for 3h. After the reaction is completed, filtering is performed, washing three times with ethanol, and drying in a vacuum drying oven at 50℃ to constant weight to obtain alkenyl-modified nano-tungsten trioxide.

[0022] Example 2 This embodiment discloses a method for preparing alkenyl-modified nano-zinc oxide, comprising the following steps: adjusting the pH of a 95wt% ethanol aqueous solution to 4 with 1mol / L hydrochloric acid, adding γ-glycidoxypropyltrimethoxysilane, and hydrolyzing by stirring at 300 r / min for 30 min at room temperature, then adding nano-zinc oxide, wherein the mass ratio of nano-zinc oxide, 95wt% ethanol aqueous solution, and γ-glycidoxypropyltrimethoxysilane is 8:100:8, and refluxing at 80℃ for 3 h, after which the reaction is completed, filtering, and using ethanol... The product was washed three times with ethanol and dried to constant weight in a vacuum drying oven at 50°C to obtain epoxy-modified nano-zinc oxide. 2-Allylphenol was dissolved in toluene, and epoxy-modified nano-zinc oxide and N,N-dimethylbenzylamine were added. The mass ratio of 2-allylphenol, toluene, epoxy-modified nano-zinc oxide, and N,N-dimethylbenzylamine was 13:200:10:1.5. The mixture was refluxed at 120°C for 4 hours under nitrogen protection. After the reaction was complete, the product was filtered, washed three times with ethanol, and dried to constant weight in a vacuum drying oven at 50°C to obtain alkenyl-modified nano-zinc oxide.

[0023] Example 3 This embodiment discloses a preparation process for a UV-sensitive color-changing fabric, including the following steps: Step 1: The polyester fabric base is immersed in the composite finishing agent and impregnated at room temperature. The mass ratio of the polyester fabric base to the composite finishing agent is 1:15. Two dips and two nips are performed, with a liquid retention rate of 85%. After impregnation, both sides of the polyester fabric base are irradiated with blue light at a wavelength of 405nm for 30 minutes to cure the reaction. After the reaction, it is washed three times with deionized water and air-dried naturally to obtain a polyester fabric with UV-sensitive color-changing function. The composite finishing agent is prepared using the following steps: S1, cinnamaldehyde, o-propyleneoxybenzaldehyde, and amino-terminated... Polydimethylsiloxane was added to diethyl ether, with the molar ratio of cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane being 1:1:1. The amount of diethyl ether was three times the mass of the amino-terminated polydimethylsiloxane. The mixture was refluxed at 40°C for 12 hours. After the reaction, ethanol with a mass three times that of diethyl ether was added to separate the mixture into layers. The solvent in the upper layer was removed, and the mixture was dried with anhydrous sodium sulfate to obtain an organic photosensitizing monomer. S2: The organic photosensitizing monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer were mixed. The organic photosensitizing monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer were combined in a mass ratio of 126:55:59.6:11.6:8.7:15.6 to obtain a mixed monomer. A composite emulsifier was added to deionized water at a mass ratio of 1:20, and stirred at 500 r / min for 30 min to obtain an emulsifier solution. This emulsifier solution was divided into a first part and a second part, with the first part accounting for a certain percentage. The first part of the emulsifier solution comprises 30% of the total mass of the emulsifier solution, and the second part comprises 70% of the total mass of the emulsifier solution. The initiator is added to deionized water at a mass ratio of 1:30, and stirred at 500 r / min for 30 min to obtain an initiator solution. The initiator solution is then divided into a first part and a second part, with the first part comprising 25% of the total mass of the initiator solution and the second part comprising 75% of the total mass of the initiator solution. The mass ratio of the mixed monomer, composite emulsifier, and initiator is 100:3:0.5. Under stirring conditions of 500 r / min, the mixed monomers were added dropwise to the first part of the emulsifier solution, and stirring was continued at 500 r / min for 30 min to obtain a monomer pre-emulsion. The mixed monomers were then divided into a first part of the monomer pre-emulsion and a second part of the monomer pre-emulsion, with the first part accounting for 15% of the total mass of the monomer pre-emulsion and the second part accounting for 85% of the total mass of the monomer pre-emulsion. The second part of the emulsifier solution was heated to 70°C, and the first part of the monomer pre-emulsion and the first part of the initiator solution were added. The reaction was carried out at 70°C for 60 min. After the reaction was completed, the second part of the monomer pre-emulsion and the second part of the initiator solution were added dropwise, and the temperature was raised to 85°C. The reaction was continued at 85°C for 70 min. After the reaction was completed, the mixture was cooled to room temperature to obtain the desired product. Add 0.5% (by mass) of the photoinitiator phenyl (2,4,6-trimethylbenzoyl) lithium phosphate to the mixture, and stir at 500 r / min for 30 min to obtain the composite finishing agent; wherein, the composite emulsifier is sodium dodecylbenzenesulfonate and AEO-9 in a mass ratio of 1:1; the initiator is potassium persulfate; the alkenyl-modified nano tungsten trioxide is the alkenyl-modified nano tungsten trioxide prepared in Example 1; the alkenyl-modified nano zinc oxide is the alkenyl-modified nano zinc oxide prepared in Example 2; the alkenyl-containing UV-resistant monomer is 2-hydroxy-4-(methacryloyloxy)benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl-2H-benzotriazole in a molar ratio of 1:1. Step 2: Use polyester fabric with UV protection and photosensitive color-changing function as the outer layer fabric and bamboo cotton fabric as the inner layer fabric. Sew the outer and inner layers together with polyester thread in equal areas to obtain UV protection and photosensitive color-changing fabric.

[0024] Example 4 This embodiment discloses a preparation process for a UV-sensitive color-changing fabric, including the following steps: Step 1: The polyester fabric base is immersed in a composite finishing agent and impregnated at room temperature. The mass ratio of the polyester fabric base to the composite finishing agent is 1:15. Two dips and two nips are performed, with a liquid retention rate of 85%. After impregnation, both sides of the polyester fabric base are irradiated with blue light at a wavelength of 405nm for 30 minutes to cure the reaction. After the reaction, it is washed three times with deionized water and air-dried naturally to obtain a polyester fabric with UV-sensitive color-changing function. The composite finishing agent is prepared using the following steps: S1: Cinnamaldehyde, o-propylene oxybenzaldehyde, and amino-terminated polydimethylsiloxane are added to diethyl ether. The molar ratio of cinnamaldehyde, o-propylene oxybenzaldehyde, and amino-terminated polydimethylsiloxane... The ratio of the organic photosensitive monomer to the amino-terminated polydimethylsiloxane was 1:1:1. The amount of diethyl ether used was 3 times the mass of the amino-terminated polydimethylsiloxane. The mixture was refluxed at 50°C for 8 hours. After the reaction was completed, ethanol with a mass of 3 times the mass of diethyl ether was added to separate the mixture into layers. The solvent in the upper layer was removed, and the mixture was dried with anhydrous sodium sulfate to obtain the organic photosensitive monomer. S2. The organic photosensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer were mixed. The mass ratio of the organic photosensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer was 152:66:71.5:12.9:9.A 1:16 ratio of composite emulsifier to deionized water was used to obtain a mixed monomer. The composite emulsifier was added to deionized water at a mass ratio of 1:30, and stirred at 500 rpm for 30 minutes to obtain an emulsifier solution. This solution was then divided into a first part and a second part, each comprising 50% of the total mass of the emulsifier solution. An initiator was added to deionized water at a mass ratio of 1:50, and stirred at 500 rpm for 30 minutes to obtain an initiator solution. The initiator solution was divided into a first initiator solution and a second initiator solution, with the first initiator solution accounting for 45% of the total mass of the initiator solution and the second initiator solution accounting for 55% of the total mass of the initiator solution. The mass ratio of mixed monomers, composite emulsifiers, and initiators was 100:5:1. Under stirring conditions of 500 r / min, the mixed monomers were added dropwise to the first emulsifier solution, and stirring was continued at 500 r / min for 30 min to obtain a monomer pre-emulsion. The mixed monomers were then divided into a first monomer pre-emulsion and a second monomer pre-emulsion, with the first monomer pre-emulsion accounting for 55% of the total mass of the monomers. The first part of the preemulsion comprises 35% of the total mass of the preemulsion, and the second part of the monomer preemulsion comprises 65% of the total mass of the monomer preemulsion. The second part of the emulsifier solution is heated to 80°C, and the first part of the monomer preemulsion and the first part of the initiator solution are added. The reaction is carried out at 80°C for 30 min. After the reaction is completed, the second part of the monomer preemulsion and the second part of the initiator solution are added dropwise, the temperature is raised to 90°C, and the reaction is continued at 90°C for 50 min. After the reaction is completed, the mixture is cooled to room temperature to obtain a mixture. 1.5% of the photoinitiator phenyl (2,4,6-trimethylbenzoyl) lithium phosphate is added to the mixture, and the mixture is heated to 500 °C. The composite finishing agent was obtained by stirring and mixing at a speed of r / min for 30 min; wherein, the composite emulsifier was composed of sodium dodecylbenzenesulfonate and AEO-9 in a mass ratio of 1:1; the initiator was potassium persulfate; the alkenyl-modified nano-tungsten trioxide was the alkenyl-modified nano-tungsten trioxide prepared in Example 1; the alkenyl-modified nano-zinc oxide was the alkenyl-modified nano-zinc oxide prepared in Example 2; the alkenyl-containing UV-resistant monomer was composed of 2-hydroxy-4-(methacryloyloxy)benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl-2H-benzotriazole in a molar ratio of 1:1. Step 2: Use polyester fabric with UV protection and photosensitive color-changing function as the outer layer fabric and bamboo cotton fabric as the inner layer fabric. Sew the outer and inner layers together with polyester thread in equal areas to obtain UV protection and photosensitive color-changing fabric.

[0025] Example 5 This embodiment discloses a preparation process for a UV-sensitive color-changing fabric, including the following steps: Step 1: The polyester fabric base is immersed in the composite finishing agent and impregnated at room temperature. The mass ratio of the polyester fabric base to the composite finishing agent is 1:15. Two dips and two nips are performed, with a liquid retention rate of 85%. After impregnation, both sides of the polyester fabric base are irradiated with blue light at a wavelength of 405nm for 30 minutes to cure the reaction. After the reaction, it is washed three times with deionized water and air-dried naturally to obtain a polyester fabric with UV-sensitive color-changing function. The composite finishing agent is prepared using the following steps: S1, cinnamaldehyde, o-propyleneoxybenzaldehyde, and amino-terminated... Polydimethylsiloxane was added to diethyl ether, with the molar ratio of cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane being 1:1:1. The amount of diethyl ether was three times the mass of the amino-terminated polydimethylsiloxane. The mixture was refluxed at 45°C for 10 hours. After the reaction, ethanol with a mass three times that of diethyl ether was added to separate the mixture into layers. The solvent in the upper layer was removed, and the mixture was dried with anhydrous sodium sulfate to obtain an organic photosensitive monomer. S2: The organic photosensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer were mixed. A mixed monomer was obtained by combining organic photosensitizing monomers, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomers in a mass ratio of 140:60:65.6:12.2:8.9:15.8. A composite emulsifier was added to deionized water at a mass ratio of 1:25, and stirred at 500 r / min for 30 min to obtain an emulsifier solution. This solution was then divided into a first emulsifier solution and a second emulsifier solution, with the first emulsifier solution accounting for a certain percentage. The first part of the emulsifier solution comprises 40% of the total mass of the emulsifier solution, and the second part comprises 60% of the total mass of the emulsifier solution. The initiator is added to deionized water at a mass ratio of 1:40, and stirred at 500 r / min for 30 min to obtain an initiator solution. The initiator solution is then divided into a first part and a second part, with the first part comprising 35% of the total mass of the initiator solution and the second part comprising 65% of the total mass of the initiator solution. The mass ratio of the mixed monomer, composite emulsifier, and initiator is 100:4:0.8. Under stirring conditions of 500 rpm, the mixed monomers were added dropwise to the first part of the emulsifier solution. Stirring continued at 500 rpm for 30 minutes to obtain a monomer pre-emulsion. The mixed monomers were then divided into a first part of the monomer pre-emulsion and a second part of the monomer pre-emulsion, with the first part comprising 25% of the total mass and the second part comprising 75%. The second part of the emulsifier solution was heated to 75°C, and the first part of the monomer pre-emulsion and the first part of the initiator solution were added. The reaction was carried out at 75°C for 45 minutes. After the reaction was completed, the second part of the monomer pre-emulsion and the second part of the initiator solution were added dropwise, the temperature was raised to 88°C, and the reaction continued at 88°C for 60 minutes. After the reaction was completed, the mixture was cooled to room temperature. A mixture was obtained, and 1% (by mass) of the photoinitiator phenyl (2,4,6-trimethylbenzoyl) lithium phosphate was added to the mixture. The mixture was stirred at 500 r / min for 30 min to obtain a composite finishing agent. The composite emulsifier was sodium dodecylbenzenesulfonate and AEO-9 in a 1:1 mass ratio; the initiator was potassium persulfate; the alkenyl-modified nano-tungsten trioxide was the alkenyl-modified nano-tungsten trioxide prepared in Example 1; the alkenyl-modified nano-zinc oxide was the alkenyl-modified nano-zinc oxide prepared in Example 2; the alkenyl-containing UV-resistant monomer was 2-hydroxy-4-(methacryloyloxy)benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl-2H-benzotriazole in a 1:1 molar ratio. Step 2: Use polyester fabric with UV protection and photosensitive color-changing function as the outer layer fabric and bamboo cotton fabric as the inner layer fabric. Sew the outer and inner layers together with polyester thread in equal areas to obtain UV protection and photosensitive color-changing fabric.

[0026] Comparative Example 1 This comparative example discloses a preparation process for a UV-sensitive color-changing fabric, including the following steps: Step 1: The polyester fabric base is immersed in the composite finishing agent and impregnated at room temperature. The mass ratio of the polyester fabric base to the composite finishing agent is 1:15. Two dips and two nips are performed, with a liquid retention rate of 85%. After impregnation, both sides of the polyester fabric base are irradiated with blue light at a wavelength of 405nm for 30 minutes to cure the reaction. After the reaction, it is washed three times with deionized water and air-dried naturally to obtain a polyester fabric with UV-sensitive color-changing function. The composite finishing agent is prepared using the following steps: S1, cinnamaldehyde, o-propyleneoxybenzaldehyde, and amino-terminated... Polydimethylsiloxane was added to diethyl ether, with the molar ratio of cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane being 1:1:1. The amount of diethyl ether was three times the mass of the amino-terminated polydimethylsiloxane. The mixture was refluxed at 40°C for 12 hours. After the reaction, ethanol with a mass three times that of diethyl ether was added to separate the mixture into layers. The solvent in the upper layer was removed, and the mixture was dried with anhydrous sodium sulfate to obtain an organic photosensitive monomer. S2: The organic photosensitive monomer, ethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer were mixed. The organic photosensitizing monomer, ethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer were combined in a mass ratio of 126:55:59.6:11.6:8.7:15.6 to obtain a mixed monomer. A composite emulsifier was added to deionized water at a mass ratio of 1:20, and stirred at 500 r / min for 30 min to obtain an emulsifier solution. This emulsifier solution was divided into a first part and a second part, with the first part accounting for a certain percentage of the emulsion. The first part of the emulsifier solution comprises 30% of the total mass of the emulsifier solution, and the second part comprises 70% of the total mass of the emulsifier solution. The initiator is added to deionized water at a mass ratio of 1:30, and stirred at 500 r / min for 30 min to obtain an initiator solution. The initiator solution is then divided into a first part and a second part, with the first part comprising 25% of the total mass of the initiator solution and the second part comprising 75% of the total mass of the initiator solution. The mass ratio of the mixed monomer, composite emulsifier, and initiator is 100:3:0.5. Under stirring conditions of 500 r / min, the mixed monomers were added dropwise to the first part of the emulsifier solution, and stirring was continued at 500 r / min for 30 min to obtain a monomer preemulsion. The mixed monomers were then divided into a first part of monomer preemulsion and a second part of monomer preemulsion, with the first part accounting for 15% of the total mass of the monomer preemulsion and the second part accounting for 85% of the total mass of the monomer preemulsion. The second part of the emulsifier solution was heated to 70°C, and the first part of monomer preemulsion and the first part of the initiator solution were added. The solution was reacted at 70℃ for 60 min. After the reaction, the second part of the monomer pre-emulsion and the second part of the initiator solution were added dropwise. The temperature was raised to 85℃ and the reaction was continued at 85℃ for 70 min. After the reaction, the solution was cooled to room temperature to obtain a mixture. 0.5% (by mass) of the photoinitiator phenyl (2,4,6-trimethylbenzoyl) lithium phosphate was added to the mixture, and the mixture was stirred at 500 r / min for 30 min to obtain the composite finishing agent. The composite emulsifier was dodecylbenzene sulfonate. Sodium sulfate and AEO-9 were compounded in a mass ratio of 1:1; potassium persulfate was used as the initiator; the alkenyl-modified nano-tungsten trioxide was the alkenyl-modified nano-tungsten trioxide prepared in Example 1; the alkenyl-containing UV-resistant monomer was a compound of 2-hydroxy-4-(methacryloyloxy)benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl-2H-benzotriazole in a molar ratio of 1:1; the alkenyl-modified nano-zinc oxide was prepared by the following steps: adjusting 95wt% ethanol-water with 1mol / L hydrochloric acid. The solution had a pH of 4. γ-(methacryloyloxy)propyltrimethoxysilane was added, and the mixture was hydrolyzed at 300 rpm for 30 min at room temperature. Then, nano-zinc oxide was added. The mass ratio of nano-zinc oxide, 95 wt% ethanol aqueous solution, and γ-(methacryloyloxy)propyltrimethoxysilane was 8:100:8. The mixture was refluxed at 80 °C for 3 h. After the reaction was complete, the mixture was filtered, washed three times with ethanol, and dried in a vacuum drying oven at 50 °C to constant weight to obtain alkenyl-modified nano-zinc oxide. Step 2: Use polyester fabric with UV protection and photosensitive color-changing function as the outer layer fabric and bamboo cotton fabric as the inner layer fabric. Sew the outer and inner layers together with polyester thread in equal areas to obtain UV protection and photosensitive color-changing fabric.

[0027] Comparative Example 2 This comparative example discloses a preparation process for a UV-sensitive color-changing fabric, including the following steps: Step 1: The polyester fabric base is immersed in a composite finishing agent and impregnated at room temperature. The mass ratio of the polyester fabric base to the composite finishing agent is 1:15. Two dips and two nips are performed, with a liquid retention rate of 85%. After impregnation, both sides of the polyester fabric base are irradiated with blue light at a wavelength of 405nm for 30 minutes to cure the reaction. After the reaction, it is washed three times with deionized water and air-dried naturally to obtain a polyester fabric with UV-sensitive color-changing function. The composite finishing agent is prepared using the following steps: S1, o-propylene-oxybenzaldehyde, amino-terminated polydidimethylformaldehyde... Methylsiloxane was added to diethyl ether, with a molar ratio of o-propenyloxybenzaldehyde to amino-terminated polydimethylsiloxane of 1:1. The amount of diethyl ether was three times the mass of the amino-terminated polydimethylsiloxane. The mixture was refluxed at 40°C for 12 hours. After the reaction, ethanol with a mass three times that of diethyl ether was added to separate the mixture into layers. The solvent in the upper layer was removed, and the mixture was dried with anhydrous sodium sulfate to obtain an organic photosensitive monomer. S2: The organic photosensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomers were mixed to form an organic photosensitive monomer. The mass ratio of the following monomers—sensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano-tungsten trioxide, alkenyl-modified nano-zinc oxide, and alkenyl-containing UV-resistant monomer—was 126:55:59.6:11.6:8.7:15.6, yielding a mixed monomer. A composite emulsifier was added to deionized water at a mass ratio of 1:20, and stirred at 500 r / min for 30 min to obtain an emulsifier solution. This solution was then divided into a first emulsifier solution and a second emulsifier solution. The first emulsifier solution constituted the majority of the emulsifier solution. The first part of the emulsifier solution accounts for 30% of the total mass of the solution, and the second part accounts for 70% of the total mass of the emulsifier solution. The initiator is added to deionized water at a mass ratio of 1:30 and stirred at 500 r / min for 30 min to obtain the initiator solution. The initiator solution is divided into a first part and a second part, with the first part accounting for 25% of the total mass of the initiator solution and the second part accounting for 75% of the total mass of the initiator solution. The mass ratio of the mixed monomer, composite emulsifier, and initiator is 100:3:0.5. Under stirring conditions of 500 r / min, the mixed monomers were added dropwise to the first part of the emulsifier solution, and stirring was continued at 500 r / min for 30 min to obtain a monomer pre-emulsion. The mixed monomers were then divided into a first part of the monomer pre-emulsion and a second part of the monomer pre-emulsion, with the first part accounting for 15% of the total mass of the monomer pre-emulsion and the second part accounting for 85% of the total mass of the monomer pre-emulsion. The second part of the emulsifier solution was heated to 70°C, and the first part of the monomer pre-emulsion and the first part of the initiator solution were added. The reaction was carried out at 70°C for 60 min. After the reaction was completed, the second part of the monomer pre-emulsion and the second part of the initiator solution were added dropwise, and the temperature was raised to 85°C. The reaction was continued at 85°C for 70 min. After the reaction was completed, the mixture was cooled to room temperature to obtain the desired product. Add 0.5% (by mass) of the photoinitiator phenyl (2,4,6-trimethylbenzoyl) lithium phosphate to the mixture, and stir at 500 r / min for 30 min to obtain the composite finishing agent; wherein, the composite emulsifier is sodium dodecylbenzenesulfonate and AEO-9 in a mass ratio of 1:1; the initiator is potassium persulfate; the alkenyl-modified nano tungsten trioxide is the alkenyl-modified nano tungsten trioxide prepared in Example 1; the alkenyl-modified nano zinc oxide is the alkenyl-modified nano zinc oxide prepared in Example 2; the alkenyl-containing UV-resistant monomer is 2-hydroxy-4-(methacryloyloxy)benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl-2H-benzotriazole in a molar ratio of 1:1. Step 2: Use polyester fabric with UV protection and photosensitive color-changing function as the outer layer fabric and bamboo cotton fabric as the inner layer fabric. Sew the outer and inner layers together with polyester thread in equal areas to obtain UV protection and photosensitive color-changing fabric.

[0028] In the above embodiments and comparative examples, the particle size of nano-tungsten trioxide is 100 nm; the particle size of nano-zinc oxide is 1200 nm; the polyester fabric base is knitted polyester fabric, composed of 100% polyester fiber, with a basis weight of 220 g / m². 2 The yarn count is 32s; the molecular weight of amino-terminated polydimethylsiloxane is 1000; the bamboo-cotton fabric contains 70% bamboo fiber and 30% cotton fiber, with a weight of 130g / m². 2 The yarn count is 32s.

[0029] Test case (1) Photosensitive color-changing performance: The color change of the polyester fabric samples with UV protection photosensitive color-changing function prepared in Examples 3-5 and Comparative Examples 1-2 was measured after irradiation with a 365nm UV lamp for 1 min. The results are shown in Table 1:

[0030] As shown in Table 1, the polyester fabric with UV protection and photosensitive color-changing function prepared in this invention has a good photosensitive color-changing effect. Nano-tungsten trioxide, as an inorganic photosensitive component, has photochromic properties; the organic photosensitive monomer prepared by reacting cinnamaldehyde, o-propenyloxybenzaldehyde, and amino-terminated polydimethylsiloxane, with the introduced cinnamyl group serving as a chromophore group of the organic photosensitive monomer, can achieve photochromism; the Schiff base group generated during the reaction has unique optical, thermal, and electrical properties, and can also serve as a photochromic material.

[0031] (2) UV protection performance: The UV protection performance of the polyester fabric samples with UV protection and photosensitive color-changing function prepared in Examples 3-5 and Comparative Examples 1-2 was tested after 30 washes, in accordance with the standard GB / T18830-2009 "Evaluation of UV Protection Performance of Textiles". The results of the UPF (ultraviolet protection factor) test are shown in Table 2.

[0032] As shown in Table 2, the polyester fabric with UV-sensitive color-changing function prepared in this invention has good UV protection performance. The introduction of alkenyl-containing UV-resistant monomers and nano-zinc oxide during the preparation of the composite finishing agent effectively improves the fabric's UV resistance.

[0033] (3) Antistatic properties: The antistatic properties of the polyester fabric samples with UV-sensitive color-changing function prepared in Examples 3-5 and Comparative Examples 1-2 were tested in accordance with the standard GB / T12703.4-2010 "Evaluation of electrostatic properties of textiles - Part 4: resistivity". The surface resistivity measurement results are shown in Table 3.

[0034] As shown in Table 3, the polyester fabric with UV-sensitive color-changing function prepared in this invention exhibits good antistatic properties. During the preparation of the composite finishing agent, the hydroxyl groups introduced from the hydroxyethyl acrylate monomer improve the moisture absorption of the polyester fabric, thereby enhancing its antistatic properties. In the preparation of the alkenyl-modified nano-zinc oxide, the nano-zinc oxide first reacts with γ-glycidyl etheroxypropyltrimethoxysilane to introduce epoxy groups. These epoxy groups then react with the phenolic hydroxyl groups on the 2-allylphenol molecule to form hydroxyl groups, further improving the antistatic properties of the polyester fabric. Compared to Example 3, in Comparative Example 1, no hydroxyl groups were introduced through hydroxyethyl acrylate and alkenyl-modified nano-zinc oxide, resulting in a decrease in the fabric's antistatic properties.

[0035] (4) Antibacterial performance: The antibacterial rate of the polyester fabric samples with UV protection and color-changing function prepared in Examples 3-5 and Comparative Examples 1-2 was determined according to the standard FZ / T73023-2006 "Antibacterial Knitted Fabrics" after 30 washes. The results are shown in Table 4.

[0036] As shown in Table 4, the polyester fabric with UV-sensitive color-changing function prepared in this invention exhibits good antibacterial properties. During the preparation of the composite finishing agent, cinnamaldehyde, o-propyleneoxybenzaldehyde, and amino-terminated polydimethylsiloxane react to generate Schiff base groups, which possess good antibacterial properties. The introduction of nano-zinc oxide also enhances the antibacterial properties of the fabric. Compared to Example 3, Comparative Example 2 lacks the Schiff base generated from the reaction of cinnamaldehyde and amino-terminated polydimethylsiloxane; that is, the Schiff base content in the composite finishing agent is reduced, resulting in a decrease in antibacterial properties.

[0037] 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. An ultraviolet light resistant, photochromic fabric, characterized in that, The application relates to a fabric, which comprises an inner layer fabric and an outer layer fabric; the inner layer fabric is a skin-friendly fabric; the outer layer fabric comprises a terylene fabric with an anti-ultraviolet light sensitive color-changing function; the terylene fabric with the anti-ultraviolet light sensitive color-changing function is prepared by impregnation finishing and solidification of a composite finishing agent on a terylene fabric base cloth; and the composite finishing agent is prepared by the following steps: S1, reacting cinnamyl aldehyde, o-propenyl-oxybenzaldehyde and amino-terminated polydimethylsiloxane to prepare an organic photosensitive monomer; S2, reacting the organic photosensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano tungsten trioxide, alkenyl-modified nano zinc oxide and an alkenyl-containing anti-ultraviolet monomer to prepare a composite finishing agent.

2. The ultraviolet light resistant color-shifting fabric according to claim 1, wherein, In the S1, the organic photosensitive monomer is prepared by adding cinnamyl aldehyde, o-propenyl-oxybenzaldehyde and amino-terminated polydimethylsiloxane into diethyl ether, reacting, separating, and drying to obtain the organic photosensitive monomer; wherein the molar ratio of cinnamyl aldehyde, o-propenyl-oxybenzaldehyde and amino-terminated polydimethylsiloxane is 1:1:1, and the reaction is carried out at a temperature of 40-50 DEG C under reflux for 8-12 h.

3. The ultraviolet light resistant color-shifting fabric according to claim 1, wherein, In the S2, the composite finishing agent is prepared by mixing the organic photosensitive monomer, hydroxyethyl acrylate, pentaerythritol triacrylate, alkenyl-modified nano tungsten trioxide, alkenyl-modified nano zinc oxide and the alkenyl-containing anti-ultraviolet monomer to obtain a mixed monomer; adding a composite emulsifier into deionized water, stirring to obtain an emulsifier solution, and dividing the emulsifier solution into a first part of the emulsifier solution and a second part of the emulsifier solution; adding an initiator into deionized water, stirring to obtain an initiator solution, and dividing the initiator solution into a first part of the initiator solution and a second part of the initiator solution; under stirring, dropping the mixed monomer into the first part of the emulsifier solution, continuing to stir to obtain a monomer pre-emulsion, and dividing the mixed monomer into a first part of the monomer pre-emulsion and a second part of the monomer pre-emulsion; heating the second part of the emulsifier solution to a first set temperature, adding the first part of the monomer pre-emulsion and the first part of the initiator solution, reacting, adding the second part of the monomer pre-emulsion and the second part of the initiator solution after the reaction is completed, heating to a second set temperature, continuing to react, cooling to room temperature after the reaction is completed, adding a photoinitiator into the mixed solution, stirring and mixing to obtain the composite finishing agent.

4. The ultraviolet light resistant color-shifting fabric according to claim 3, wherein, The mass ratio of the mixed monomers, the composite emulsifier and the initiator is 100: (3-5): (0.5-1), the reaction condition is that the reaction is carried out at a first set temperature for 30-60 min, and the continuous reaction condition is that the reaction is carried out at a second set temperature for 50-70 min; the first set temperature is 70-80℃, and the second set temperature is 85-90℃; the mass ratio of the organic photosensitive monomer, the hydroxyethyl acrylate, the pentaerythritol triacrylate, the alkenyl modified nano tungsten trioxide, the alkenyl modified nano zinc oxide and the alkenyl containing anti-ultraviolet monomer in the mixed monomers is (126-152):(55-66):(59.6-71.5):(11.6-12.9):(8.7-9.1):(15.6-16); the composite emulsifier comprises sodium dodecyl benzene sulfonate and AEO-9 compounded in a mass ratio of 1:1; the initiator comprises potassium persulfate; the addition amount of the photoinitiator is 0.5%-1.5% of the mass of the mixed solution; and the photoinitiator comprises phenyl (2,4,6-trimethylbenzoyl) lithium phosphate.

5. The ultraviolet light resistant color-shifting fabric according to claim 1, wherein, The alkenyl modified nano tungsten trioxide, is prepared by the following steps: adjusting the pH value of an ethanol aqueous solution to 3.5-4.5, adding γ-(methacryloyloxy) propyl trimethoxysilane, stirring and hydrolyzing, then adding nano tungsten trioxide, reacting, filtering, washing and drying after the reaction is completed, to obtain the alkenyl modified nano tungsten trioxide; wherein the mass ratio of the nano tungsten trioxide, the ethanol aqueous solution and the γ-(methacryloyloxy) propyl trimethoxysilane is 21.5:(200-300):(18-24), and the reaction condition is refluxing at 75-85℃ for 2.5-3.5h.

6. The ultraviolet light resistant color-shifting fabric of claim 1, wherein, The alkenyl modified nano zinc oxide is prepared by the following steps: adjusting the pH value of an ethanol aqueous solution to 3.5-4.5, adding γ-glycidyl ether oxygen propyl trimethoxysilane, stirring and hydrolyzing, then adding nano zinc oxide, reacting, filtering, washing and drying after the reaction is completed, to obtain the epoxy modified nano zinc oxide; dissolving 2-allyl phenol in toluene, adding the epoxy modified nano zinc oxide and N,N-dimethyl benzylamine, reacting, filtering, washing and drying after the reaction is completed, to obtain the alkenyl modified nano zinc oxide.

7. The ultraviolet light resistant color-shifting fabric according to claim 6, wherein, When the epoxy modified nano zinc oxide is prepared, the mass ratio of the nano zinc oxide, the ethanol aqueous solution and the γ-glycidyl ether oxygen propyl trimethoxysilane is 8:(80-120):(6-10), and the reaction condition is refluxing at 75-85℃ for 2.5-3.5h; when the alkenyl modified nano zinc oxide is prepared, the mass ratio of the 2-allyl phenol, the toluene, the epoxy modified nano zinc oxide and the N,N-dimethyl benzylamine is (12-14):(150-250):(8-12):(1-2), and the reaction condition is refluxing at 110-130℃ for 3-5h under nitrogen protection.

8. The ultraviolet light resistant color-shifting fabric of claim 1, wherein, The anti-ultraviolet monomer containing alkenyl group includes 2-hydroxy-4-(methacryloyloxy) benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy) ethyl] phenyl-2H-benzotriazole; the molar ratio of the 2-hydroxy-4-(methacryloyloxy) benzophenone and 2-[2-hydroxy-5-[2-(methacryloyloxy) ethyl] phenyl-2H-benzotriazole is 1:

1.

9. A process for the preparation of an ultraviolet light sensitive colour changeable fabric as claimed in any one of claims 1 to 8, wherein, The method comprises the following steps: Step one, the polyester fabric base cloth is placed in the composite finishing agent for impregnation finishing, after the impregnation finishing is completed, photocuring treatment, washing, drying, and the polyester fabric with the function of preventing ultraviolet light sensitive discoloration is obtained; Step two, the polyester fabric with the function of preventing ultraviolet light sensitive discoloration is used as the outer layer fabric, the skin-friendly fabric is used as the inner layer fabric, and the outer layer fabric and the inner layer fabric are compounded to obtain the anti-ultraviolet light sensitive discoloration fabric.

10. The process for preparing an ultraviolet light resistant photochromic fabric according to claim 9, characterized in that, In the step one, the mass ratio of the polyester fabric base cloth and the composite finishing agent is 1: (10-20), the impregnation finishing is carried out at room temperature, two impregnation and two rolling are carried out, the liquid carrying rate is 80%-90%, and the photocuring treatment process comprises that the two sides of the polyester fabric base cloth after the impregnation finishing are irradiated under the blue light with the wavelength of 405 nm for 30 min for the curing reaction.

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