Sunscreen fabric and preparation method thereof

Abstract

The invention discloses a sunscreen fabric and a preparation method thereof. The sunscreen fabric is prepared by soaking a base fabric in different agents for treatment. The sunscreen fabric uses modified nylon as a base material. The modified nylon molecule is a branched structure, and the molecular chain contains a hydroxybenzophenone structure, wherein the ketone group and the hydroxyl group form an internal hydrogen bond to form a chelate ring. After absorbing ultraviolet rays, the hydrogen bond breaks, the chelate ring opens, and the energy of the ultraviolet light is converted into heat energy and released. The sunscreen fabric contains an imidazole zinc framework structure, which has a high specific surface area and a porous structure, can capture and scatter ultraviolet rays, reduce penetration depth, and achieve the effect of shielding ultraviolet rays. At the same time, the surface contains an organic silicon layer and a hydrophobic layer composed of benzene rings and long-chain alkyl groups, which can prevent the imidazole zinc from falling off due to repeated washing, thereby extending the sunscreen life of the fabric.

Description

Technical Field

[0001] The invention relates to the technical field of sun-proof fabric preparation, and in particular to a sun-proof fabric and a preparation method thereof. Background Art

[0002] With the change of greenhouse effect, the ultraviolet rays in the sunlight projected to the ground through the atmosphere are becoming stronger and stronger, which has brought many inconveniences to people's lives. Ultraviolet rays not only make textiles fade and brittle, but also cause sunburn and aging of human skin, and produce melanin and spots. With the development of science and technology, people have gradually developed sun-proof fabrics, and reduced the harm of ultraviolet rays to the human body through sun-proof clothing made of sun-proof fabrics. At present, some sun-proof and anti-ultraviolet fabrics are mainly added to the fibers by zinc oxide, calcium carbide and other substances with anti-ultraviolet properties to give the fabrics anti-ultraviolet properties. Through the above-mentioned related technologies, after the sun-proof and anti-ultraviolet fabrics are immersed in water or washed several times, the anti-ultraviolet substances zinc oxide and calcium carbonate in the fabrics are easy to fall off, so that the anti-ultraviolet performance of the fabrics is gradually weakened, resulting in poor sun protection durability of the sun-proof fabrics. Summary of the invention

[0003] The purpose of the present invention is to provide a sun-proof fabric and a preparation method thereof, which solves the problem that the sun-proof effect of the current sun-proof fabric is poor and the sun-proof effect is significantly reduced after repeated washing.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a sun-proof fabric comprises the following steps:

[0006] Step A1: dissolving 2-vinylimidazole in deionized water, soaking the base fabric therein, performing ultrasonic treatment and adding zinc nitrate hexahydrate at a temperature of 20-25° C. and a frequency of 20-30 kHz, performing ultrasonic treatment for 1-1.5 hours, heating to 40-50° C., soaking for 10-15 hours, taking out and drying to obtain a pretreated fabric;

[0007] Step A2: thioglycerol, benzophenone and deionized water are mixed evenly, and the pretreated fabric is immersed in the mixture. The pretreated fabric is ultrasonically treated for 30-40 minutes at a temperature of 20-25° C. and a frequency of 30-40 kHz. The pretreated fabric is then taken out and irradiated with 365 nm ultraviolet light for 10-15 seconds. The surface is coated with a mixture of KH570 and ethanol, and the pretreated fabric is dried through ventilation to obtain a modified fabric.

[0008] Step A3: Evenly mix butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water, immerse the modified fabric therein, perform ultrasonic treatment for 30-40 minutes at a temperature of 20-25° C. and a frequency of 30-40 kHz, take out and perform heat preservation treatment for 6-8 hours at a temperature of 65-70° C. to obtain a sun-proof fabric.

[0009] Furthermore, the usage ratio of 2-vinylimidazole, deionized water and zinc nitrate hexahydrate described in step A1 is 5g:300mL:8g.

[0010] Furthermore, the dosage ratio of thioglycerol, benzophenone and deionized water in step A2 is 20 mL: 1 g: 200 mL, and the volume ratio of KH570 and ethanol is 1:5.

[0011] Furthermore, the amount ratio of butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water described in step A3 is 45g:24g:20g:1g:350mL.

[0012] Furthermore, the base fabric is made by the following steps:

[0013] Step B1: 2, 4-dihydroxybenzophenone, triethylamine and tetrahydrofuran are mixed evenly, stirred and acryloyl chloride is added at a speed of 120-150 r / min and a temperature of 0-5°C, and the mixture is reacted for 4-6 hours to obtain a modifier, tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF are mixed evenly, and the mixture is reacted for 5-7 hours at a speed of 120-150 r / min and a temperature of 60-70°C to obtain a capping agent;

[0014] Step B2: Tetramethylcyclotetrasiloxane, 2-vinylimidazole, chloroplatinic acid and DMF are mixed evenly, and reacted for 3-5 hours at a speed of 120-150 r / min and a temperature of 70-80° C. to obtain functionalized cyclotetrasiloxane; octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane, a capping agent, potassium ethoxide, dimethyl sulfoxide and toluene are mixed evenly, and reacted for 5-7 hours at a speed of 150-200 r / min and a temperature of 110-120° C. to obtain a modified monomer;

[0015] Step B3: caprolactam and sodium hydride are mixed, stirred for 30-40 minutes at a speed of 60-80r / min and a temperature of 85-90°C, a modified monomer is added, the temperature is raised to 180-190°C, N-acetyl caprolactam is added, and the reaction is carried out for 5-7 hours to obtain modified nylon, and the modified nylon is dissolved in hexafluoroisopropanol to obtain a spinning solution, and the spinning solution is electrospun and hot-pressed at a voltage of 20-25kV, a receiving distance of 18-20cm, a receiving roller speed of 100-120r / min, and an infusion speed of 0.1-0.2mm / min to obtain a basic fabric.

[0016] Furthermore, the molar ratio of 2, 4-dihydroxybenzophenone, triethylamine and acryloyl chloride in step B1 is 1:1:1.1, the molar ratio of tetramethyldisiloxane and the modifier is 1:2, and the amount of chloroplatinic acid used is 1‰ of the mass of tetramethyldisiloxane.

[0017] Further, the molar ratio of tetramethylcyclotetrasiloxane and 2-vinylimidazole described in step B2 is 1:4, the amount of chloroplatinic acid is 1‰ of the mass of tetramethylcyclotetrasiloxane, the molar ratio of octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane and capping agent is 30:15:3:2, the amount of sodium ethoxide is 3‰ of the mass of octamethylcyclotetrasiloxane, and the amount of dimethyl sulfoxide is 1% of the mass of octamethylcyclotetrasiloxane.

[0018] Furthermore, the mass ratio of caprolactam to modified monomer in step B3 is 2:15, the amount of sodium hydride is 5‰ of the mass of caprolactam, the amount of N-acetyl caprolactam is 1% of the mass of caprolactam, and the amount ratio of modified nylon to hexafluoroisopropanol is 10mg:1mL.

[0019] The beneficial effects of the present invention are as follows: a sunscreen fabric prepared by the present invention comprises dissolving 2-vinylimidazole in deionized water and immersing a base fabric therein, ultrasonicating and adding zinc nitrate hexahydrate, so that the imidazole on the surface of the base fabric and the imidazole on the 2-vinylimidazole can cooperate with the zinc ions in the zinc nitrate hexahydrate to form a framework structure of imidazole zinc on the surface of the base fabric, and the surface contains double bonds to prepare a pretreated fabric, mixing thioglycerol, benzophenone and deionized water, immersing the pretreated fabric therein, irradiating with 365 ultraviolet light, so that the thiol on the thioglycerol and the double bonds on the surface of the pretreated fabric are grafted, so that a large number of hydroxyl groups are grafted on the surface, and then coating the surface with a coating agent. After the coated KH570 comes into contact with moisture in the air, the siloxane on the KH570 is hydrolyzed to produce silanol groups, one part of which is grafted to the surface hydroxyl groups, and the other part is grafted to the adjacent silanol groups to form an organic silicon protective layer on the surface to obtain a modified fabric. Butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water are mixed, and the modified fabric is immersed in them and taken out for high temperature insulation. The unsaturated double bonds on the surface of butyl acrylate, isooctyl acrylate, styrene and the modified fabric are polymerized under the action of azobisisobutyronitrile to form a polyacrylate layer on the surface. At the same time, the surface contains a large number of benzene rings and long-chain alkyls to obtain a sunscreen fabric.

[0020] The basic fabric is prepared by reacting 2,4-dihydroxybenzophenone as a raw material with acryloyl chloride under the action of triethylamine, so that the hydroxyl group on the 4-position of 2,4-dihydroxybenzophenone reacts with the acyl chloride group on the acryloyl chloride to obtain a modifier, reacting tetramethyldisiloxane with the modifier, so that the Si-H bond on the tetramethyldisiloxane reacts with the double bond on the modifier to obtain a capping agent, reacting tetramethylcyclotetrasiloxane with 2-vinylimidazole, so that the Si-H bond on the tetramethylcyclotetrasiloxane reacts with the double bond on the 2-vinylimidazole to obtain a functionalized cyclotetrasiloxane, ring-opening octamethylcyclotetrasiloxane and the functionalized cyclotetrasiloxane, and then condensing with 3-aminopropylmethyldimethoxysilane, and finally capping with a capping agent to obtain a modified monomer, ring-opening caprolactam and polymerizing it with the modified monomer to obtain a modified nylon, and electrospinning and hot-pressing the modified nylon to obtain the basic fabric.

[0021] The sunscreen fabric uses modified nylon as its base material. The modified nylon molecules have a branched structure and contain a hydroxybenzophenone structure on the molecular chain. The keto group and the hydroxyl group form an intrinsic hydrogen bond to form a chelate ring. After absorbing ultraviolet rays, the hydrogen bond breaks, the chelate ring opens, and the energy of the ultraviolet light is converted into heat and released. The sunscreen fabric contains an imidazole zinc framework structure. Its high specific surface area and porous structure can capture and scatter ultraviolet rays, reduce the penetration depth, and achieve the effect of shielding ultraviolet rays. At the same time, the surface contains a silicone layer and a hydrophobic layer of benzene rings and long-chain alkyl groups, which can prevent the imidazole zinc from falling off due to repeated washing, thereby extending the sunscreen life of the fabric. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: A method for preparing a sunscreen fabric, comprising the following steps:

[0024] Step A1: 2-vinylimidazole is dissolved in deionized water, and the base fabric is immersed therein, and ultrasonic treatment is performed and zinc nitrate hexahydrate is added under the conditions of temperature of 20° C. and frequency of 20 kHz. After ultrasonic treatment for 1 hour, the temperature is raised to 40° C., and the base fabric is immersed for 10 hours. The base fabric is taken out and dried to obtain a pretreated fabric.

[0025] Step A2: thioglycerol, benzophenone and deionized water are mixed evenly, and the pretreated fabric is immersed in the mixture. After ultrasonic treatment for 30 minutes at a temperature of 20°C and a frequency of 30kHz, the pretreated fabric is taken out and irradiated with 365nm ultraviolet light for 10 seconds, and the surface is coated with a mixture of KH570 and ethanol, and the mixture is ventilated and dried to obtain a modified fabric.

[0026] Step A3: Evenly mix butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water, immerse the modified fabric therein, treat it with ultrasound at a temperature of 20°C and a frequency of 30 kHz for 30 minutes, take it out and keep it warm for 6 hours at a temperature of 65°C to obtain a sun-proof fabric.

[0027] The usage ratio of 2-vinylimidazole, deionized water and zinc nitrate hexahydrate described in step A1 is 5g:300mL:8g.

[0028] The dosage ratio of thioglycerol, benzophenone and deionized water in step A2 is 20mL:1g:200mL, and the volume ratio of KH570 and ethanol is 1:5.

[0029] The usage ratio of butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water described in step A3 is 45g:24g:20g:1g:350mL.

[0030] The base fabric is made by the following steps:

[0031] Step B1: 2, 4-dihydroxybenzophenone, triethylamine and tetrahydrofuran were mixed evenly, stirred and acryloyl chloride was added at a speed of 120 r / min and a temperature of 0°C, and reacted for 4 hours to obtain a modifier; tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF were mixed evenly, and reacted at a speed of 120 r / min and a temperature of 60°C for 5 hours to obtain a capping agent;

[0032] Step B2: Tetramethylcyclotetrasiloxane, 2-vinylimidazole, chloroplatinic acid and DMF are mixed evenly, and reacted at a speed of 120 r / min and a temperature of 70° C. for 3 h to obtain functionalized cyclotetrasiloxane; octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane, a capping agent, potassium ethoxide, dimethyl sulfoxide and toluene are mixed evenly, and reacted at a speed of 150 r / min and a temperature of 110° C. for 5 h to obtain a modified monomer;

[0033] Step B3: caprolactam and sodium hydride are mixed, stirred for 30 minutes at a speed of 60 r / min and a temperature of 85°C, a modified monomer is added, the temperature is raised to 180°C, N-acetyl caprolactam is added, and the reaction is carried out for 5 hours to obtain modified nylon, and the modified nylon is dissolved in hexafluoroisopropanol to obtain a spinning solution, and the spinning solution is electrospun and hot-pressed at a voltage of 20 kV, a receiving distance of 18 cm, a receiving roller speed of 100 r / min, and an infusion speed of 0.1 mm / min to obtain a basic fabric.

[0034] The molar ratio of 2, 4-dihydroxybenzophenone, triethylamine and acryloyl chloride in step B1 is 1:1:1.1, the molar ratio of tetramethyldisiloxane and modifier is 1:2, and the amount of chloroplatinic acid used is 1‰ of the mass of tetramethyldisiloxane.

[0035] The molar ratio of tetramethylcyclotetrasiloxane and 2-vinylimidazole described in step B2 is 1:4, the amount of chloroplatinic acid is 1‰ of the mass of tetramethylcyclotetrasiloxane, the molar ratio of octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane and capping agent is 30:15:3:2, the amount of sodium ethoxide is 3‰ of the mass of octamethylcyclotetrasiloxane, and the amount of dimethyl sulfoxide is 1% of the mass of octamethylcyclotetrasiloxane.

[0036] The mass ratio of caprolactam to modified monomer in step B3 is 2:15, the amount of sodium hydride is 5‰ of the mass of caprolactam, the amount of N-acetyl caprolactam is 1% of the mass of caprolactam, and the amount ratio of modified nylon to hexafluoroisopropanol is 10mg:1mL.

[0037] Embodiment 2: A method for preparing a sunscreen fabric, comprising the following steps:

[0038] Step A1: 2-vinylimidazole is dissolved in deionized water, and the base fabric is immersed in the water. Under the conditions of temperature of 20° C. and frequency of 25 kHz, the base fabric is subjected to ultrasonic treatment and zinc nitrate hexahydrate is added. After the ultrasonic treatment for 1 hour, the base fabric is heated to 45° C. and immersed for 15 hours. The base fabric is taken out and dried to obtain a pretreated fabric.

[0039] Step A2: thioglycerol, benzophenone and deionized water are mixed evenly, and the pretreated fabric is immersed in the mixture. After ultrasonic treatment for 35 minutes at a temperature of 25° C. and a frequency of 35 kHz, the pretreated fabric is taken out and irradiated with 365 nm ultraviolet light for 15 seconds. The surface is coated with a mixture of KH570 and ethanol, and the mixture is ventilated and dried to obtain a modified fabric.

[0040] Step A3: Evenly mix butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water, immerse the modified fabric therein, treat it with ultrasound at a temperature of 20°C and a frequency of 35 kHz for 35 minutes, take it out and keep it warm for 7 hours at a temperature of 65°C to obtain a sun-proof fabric.

[0041] The usage ratio of 2-vinylimidazole, deionized water and zinc nitrate hexahydrate described in step A1 is 5g:300mL:8g.

[0042] The dosage ratio of thioglycerol, benzophenone and deionized water in step A2 is 20mL:1g:200mL, and the volume ratio of KH570 and ethanol is 1:5.

[0043] The usage ratio of butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water described in step A3 is 45g:24g:20g:1g:350mL.

[0044] The base fabric is made by the following steps:

[0045] Step B1: 2, 4-dihydroxybenzophenone, triethylamine and tetrahydrofuran were mixed evenly, and acryloyl chloride was added under the conditions of a rotation speed of 120 r / min and a temperature of 5°C, and the mixture was stirred for 5 hours to obtain a modifier, and tetramethyldisiloxane, a modifier, chloroplatinic acid and DMF were mixed evenly, and the mixture was reacted for 6 hours under the conditions of a rotation speed of 120 r / min and a temperature of 65°C to obtain a capping agent;

[0046] Step B2: Tetramethylcyclotetrasiloxane, 2-vinylimidazole, chloroplatinic acid and DMF are mixed evenly, and reacted at a speed of 120 r / min and a temperature of 75° C. for 4 hours to obtain functionalized cyclotetrasiloxane; octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane, a capping agent, potassium ethoxide, dimethyl sulfoxide and toluene are mixed evenly, and reacted at a speed of 150 r / min and a temperature of 115° C. for 6 hours to obtain a modified monomer;

[0047] Step B3: caprolactam and sodium hydride are mixed, stirred for 35 minutes at a speed of 80 r / min and a temperature of 85°C, a modified monomer is added, the temperature is raised to 185°C, N-acetyl caprolactam is added, and the reaction is carried out for 6 hours to obtain modified nylon, and the modified nylon is dissolved in hexafluoroisopropanol to obtain a spinning solution, and the spinning solution is electrospun and hot-pressed at a voltage of 20 kV, a receiving distance of 20 cm, a receiving roller speed of 100 r / min, and an infusion speed of 0.2 mm / min to obtain a basic fabric.

[0048] The molar ratio of 2, 4-dihydroxybenzophenone, triethylamine and acryloyl chloride in step B1 is 1:1:1.1, the molar ratio of tetramethyldisiloxane and modifier is 1:2, and the amount of chloroplatinic acid used is 1‰ of the mass of tetramethyldisiloxane.

[0049] The molar ratio of tetramethylcyclotetrasiloxane and 2-vinylimidazole described in step B2 is 1:4, the amount of chloroplatinic acid is 1‰ of the mass of tetramethylcyclotetrasiloxane, the molar ratio of octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane and capping agent is 30:15:3:2, the amount of sodium ethoxide is 3‰ of the mass of octamethylcyclotetrasiloxane, and the amount of dimethyl sulfoxide is 1% of the mass of octamethylcyclotetrasiloxane.

[0050] The mass ratio of caprolactam to modified monomer in step B3 is 2:15, the amount of sodium hydride is 5‰ of the mass of caprolactam, the amount of N-acetyl caprolactam is 1% of the mass of caprolactam, and the amount ratio of modified nylon to hexafluoroisopropanol is 10mg:1mL.

[0051] Embodiment 3: A method for preparing a sunscreen fabric, comprising the following steps:

[0052] Step A1: 2-vinylimidazole is dissolved in deionized water, and the base fabric is immersed therein, and ultrasonic treatment is performed and zinc nitrate hexahydrate is added under the conditions of temperature of 25° C. and frequency of 30 kHz. After ultrasonic treatment for 1.5 hours, the temperature is raised to 50° C., and the base fabric is immersed for 15 hours. The base fabric is taken out and dried to obtain a pretreated fabric.

[0053] Step A2: thioglycerol, benzophenone and deionized water are mixed evenly, and the pretreated fabric is immersed in the mixture. After ultrasonic treatment for 40 minutes at a temperature of 25° C. and a frequency of 40 kHz, the pretreated fabric is taken out and irradiated with 365 nm ultraviolet light for 15 seconds. The surface is coated with a mixture of KH570 and ethanol, and the mixture is ventilated and dried to obtain a modified fabric.

[0054] Step A3: Evenly mix butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water, immerse the modified fabric therein, treat it with ultrasound at a temperature of 25°C and a frequency of 40 kHz for 40 minutes, take it out and keep it warm for 8 hours at a temperature of 70°C to obtain a sun-proof fabric.

[0055] The usage ratio of 2-vinylimidazole, deionized water and zinc nitrate hexahydrate described in step A1 is 5g:300mL:8g.

[0056] The dosage ratio of thioglycerol, benzophenone and deionized water in step A2 is 20mL:1g:200mL, and the volume ratio of KH570 and ethanol is 1:5.

[0057] The usage ratio of butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water described in step A3 is 45g:24g:20g:1g:350mL.

[0058] The base fabric is made by the following steps:

[0059] Step B1: 2, 4-dihydroxybenzophenone, triethylamine and tetrahydrofuran were mixed evenly, stirred and acryloyl chloride was added at a speed of 150 r / min and a temperature of 5°C, and the reaction was carried out for 6 hours to obtain a modifier; tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF were mixed evenly, and the reaction was carried out at a speed of 150 r / min and a temperature of 70°C for 7 hours to obtain a capping agent;

[0060] Step B2: Tetramethylcyclotetrasiloxane, 2-vinylimidazole, chloroplatinic acid and DMF are mixed evenly, and reacted at a speed of 150 r / min and a temperature of 80° C. for 5 hours to obtain functionalized cyclotetrasiloxane; octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane, a capping agent, potassium ethoxide, dimethyl sulfoxide and toluene are mixed evenly, and reacted at a speed of 200 r / min and a temperature of 120° C. for 7 hours to obtain a modified monomer;

[0061] Step B3: caprolactam and sodium hydride are mixed, stirred for 40 minutes at a speed of 80 r / min and a temperature of 90°C, a modified monomer is added, the temperature is raised to 190°C, N-acetyl caprolactam is added, and the reaction is carried out for 7 hours to obtain modified nylon, and the modified nylon is dissolved in hexafluoroisopropanol to obtain a spinning solution, and the spinning solution is electrospun and hot-pressed at a voltage of 25 kV, a receiving distance of 20 cm, a receiving roller speed of 120 r / min, and an infusion speed of 0.2 mm / min to obtain a basic fabric.

[0062] The molar ratio of 2, 4-dihydroxybenzophenone, triethylamine and acryloyl chloride in step B1 is 1:1:1.1, the molar ratio of tetramethyldisiloxane and modifier is 1:2, and the amount of chloroplatinic acid used is 1‰ of the mass of tetramethyldisiloxane.

[0063] The molar ratio of tetramethylcyclotetrasiloxane and 2-vinylimidazole described in step B2 is 1:4, the amount of chloroplatinic acid is 1‰ of the mass of tetramethylcyclotetrasiloxane, the molar ratio of octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane and capping agent is 30:15:3:2, the amount of sodium ethoxide is 3‰ of the mass of octamethylcyclotetrasiloxane, and the amount of dimethyl sulfoxide is 1% of the mass of octamethylcyclotetrasiloxane.

[0064] The mass ratio of caprolactam to modified monomer in step B3 is 2:15, the amount of sodium hydride is 5‰ of the mass of caprolactam, the amount of N-acetyl caprolactam is 1% of the mass of caprolactam, and the amount ratio of modified nylon to hexafluoroisopropanol is 10mg:1mL.

[0065] Comparative Example 1: Compared with Example 1, this comparative example uses pretreated fabric instead of modified fabric, and the other steps are the same.

[0066] Comparative Example 2: Compared with Example 1, this comparative example uses pretreated fabric as sunscreen fabric, and the remaining steps are the same.

[0067] Comparative Example 3: Compared with Example 1, this comparative example uses modified fabric as the sunscreen fabric, and the other steps are the same.

[0068] Comparative Example 4: Compared with Example 1, nylon 6 is used instead of modified nylon, and the other steps are the same.

[0069] The sunscreen fabrics with a thickness of 0.5 mm prepared in Examples 1-3 and Comparative Examples 1-4 were tested for UPF value, UVA transmittance value and UVB transmittance value according to the standard of GB / T18830-2009. The tested sunscreen fabrics were subjected to 300 standard washes to test the UPF value of the sunscreen fabrics. The test results are shown in Table 1 below.

[0070] Table 1

[0071]

[0072] It can be seen from Table 1 above that the present invention has a very good UV protection effect, and the UV protection effect does not decrease significantly after multiple washings.

[0073] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a sunscreen fabric, characterized in that: The specific steps include: Step A1: dissolving 2-vinylimidazole in deionized water, soaking the base fabric therein, ultrasonically treating the base fabric and adding zinc nitrate hexahydrate, and after ultrasonic treatment, heating the base fabric for soaking, taking the base fabric out and drying the base fabric to obtain a pretreated fabric; Step A2: thioglycerol, benzophenone and deionized water are mixed evenly, and the pretreated fabric is immersed therein, and after ultrasonic treatment, the pretreated fabric is taken out and irradiated with 365 nm ultraviolet light, and the surface is coated with a mixture of KH570 and ethanol, and the mixture is ventilated and dried to obtain a modified fabric; Step A3: uniformly mixing butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water, immersing the modified fabric therein, ultrasonically treating the mixture, taking the mixture out and heat-treating the mixture at 65-70° C. to obtain a sun-proof fabric; The base fabric is made by the following steps: Step B1: 2, 4-dihydroxybenzophenone, triethylamine and tetrahydrofuran are mixed and stirred, and acryloyl chloride is added to react to obtain a modifier, and tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF are mixed and reacted to obtain a capping agent; Step B2: tetramethylcyclotetrasiloxane, 2-vinylimidazole, chloroplatinic acid and DMF are mixed and reacted to obtain functionalized cyclotetrasiloxane, and octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane, a capping agent, potassium ethoxide, dimethyl sulfoxide and toluene are mixed and reacted to obtain a modified monomer; Step B3: Mix caprolactam and sodium hydride, add modified monomer, heat up and add N-acetyl caprolactam to react to obtain modified nylon, dissolve the modified nylon in hexafluoroisopropanol to obtain spinning solution, electrospin the spinning solution and heat press to obtain basic fabric.

2. The method for preparing a sunscreen fabric according to claim 1, characterized in that: The usage ratio of 2-vinylimidazole, deionized water and zinc nitrate hexahydrate described in step A1 is 5g:300mL:8g.

3. The method for preparing a sunscreen fabric according to claim 1, characterized in that: The dosage ratio of thioglycerol, benzophenone and deionized water in step A2 is 20mL:1g:200mL, and the volume ratio of KH570 and ethanol is 1:

5.

4. The method for preparing a sunscreen fabric according to claim 1, characterized in that: The usage ratio of butyl acrylate, isooctyl acrylate, styrene, azobisisobutyronitrile and deionized water described in step A3 is 45g:24g:20g:1g:350mL.

5. The method for preparing a sunscreen fabric according to claim 1, characterized in that: The molar ratio of 2, 4-dihydroxybenzophenone, triethylamine and acryloyl chloride in step B1 is 1:1:1.1, and the molar ratio of tetramethyldisiloxane and the modifier is 1:

2.

6. The method for preparing a sunscreen fabric according to claim 1, characterized in that: The molar ratio of tetramethylcyclotetrasiloxane and 2-vinylimidazole in step B2 is 1:4, and the molar ratio of octamethylcyclotetrasiloxane, functionalized cyclotetrasiloxane, 3-aminopropylmethyldimethoxysilane and capping agent is 30:15:3:

2.

7. The method for preparing a sunscreen fabric according to claim 1, characterized in that: The mass ratio of caprolactam to modified monomer in step B3 is 2:15, and the amount ratio of modified nylon to hexafluoroisopropanol is 10 mg:1 mL.

8. A sun-proof fabric, characterized in that: Prepared according to any one of claims 1 to 7.

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