A fabric with both waterproof and UV-resistant properties and its preparation method

Abstract

This invention discloses a fabric with both waterproof and UV-resistant functions and its preparation method. The fabric preparation method includes the following steps: alkali reduction treatment of the greige fabric, followed by UV-resistant and waterproof treatment using a padding process, and baking. The UV-resistant finishing agent used comprises: benzophenone-based UV absorbers, dispersants, stabilizers, defoamers, and water; the waterproof finishing agent used is a polymer. This invention employs two padding sequences: simultaneous padding of the waterproof agent and the UV-resistant finishing agent in a specific bath, and padding the UV-resistant finishing agent first followed by the waterproof agent, to obtain a composite functional fabric. The resulting fabric exhibits excellent waterproof and UV-resistant properties, and good durability. The preparation process is simple, low-cost, and more suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of textile fabric technology, specifically relating to a composite functional fabric with both waterproof and UV-resistant functions and its preparation method. Background Technology

[0002] Waterproof and breathable fabrics are of great importance in the fields of hygiene, agriculture, protective clothing, sportswear, and construction. Waterproofing fabrics is a necessary process to give them hydrophobicity and water resistance. After being treated with a waterproofing agent, the fabric surface becomes hydrophobic, effectively preventing it from getting wet. This treatment meets people's needs for waterproof fabrics.

[0003] Prolonged exposure to ultraviolet (UV) radiation from the sun can lead to various skin problems, such as accelerated aging, burns, blemishes, and even cancer. Even when wearing clothing, there is still a risk of UV exposure and skin damage. Therefore, it is necessary to treat clothing and fabrics with UV protection to ensure the wearer's safety.

[0004] Chemical finishing of fabrics can effectively achieve strong waterproof and UV-resistant properties. However, currently used chemical finishing agents mainly involve the use of fluorinated compounds, which does not conform to environmental protection principles. Some existing fluorine-free waterproof and UV-resistant finishing agents, such as CN104328664A, require separate waterproofing and UV-resistant finishing of the greige fabric because the waterproofing agent and UV-resistant finishing agent cannot be used simultaneously, resulting in low processing efficiency. Moreover, the waterproofing agent is a composition with relatively poor compatibility between the components, making it unstable during industrial production and affecting the actual waterproofing effect. Furthermore, the component procurement cost is high, as is the fabric processing cost. In addition, its UV-resistant finishing agent contains salicylic acid, which has relatively poor stability, a narrow absorption wavelength, and poor binding ability of metal ion chelates to fibers, resulting in poor durability.

[0005] Therefore, it is essential to develop a fluorine-free waterproof and UV-resistant finishing agent for textiles, which would give the finished textiles excellent waterproof and UV-resistant properties and simplify the finishing process. Summary of the Invention

[0006] The purpose of this invention is to provide a composite functional fabric. By using a specific fluorine-free waterproofing agent formula and an anti-ultraviolet finishing agent formula to impregnate and finish the greige fabric, the fabric not only has excellent waterproof and anti-ultraviolet properties at the same time, but also has very good durability. At the same time, it further simplifies the chemical finishing process, improves efficiency, reduces the cost of chemical finishing, is more suitable for industrial production, and has better practicality.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] In a first aspect, the present invention provides a method for preparing a fabric, comprising the following steps: subjecting the greige fabric to alkali reduction treatment, then subjecting the greige fabric to UV resistance and waterproofing treatment using an impregnation process, and baking;

[0009] The UV-resistant finishing agent used in the UV-resistant treatment comprises the following components: 100 parts of benzophenone-based UV absorber, 20-90 parts of dispersant, 80-230 parts of stabilizer, 4-15 parts of defoamer, and 800-1800 parts of water; preferably, the UV-resistant finishing agent comprises the following components: 100 parts of benzophenone-based UV absorber, 30-70 parts of dispersant, 100-180 parts of stabilizer, 5-12 parts of defoamer, and 950-1550 parts of water;

[0010] The waterproofing agent used in the waterproofing treatment is a polymer, and its structural formula is as follows:

[0011]

[0012] Where x, y, and z represent the degree of aggregation, where x is any integer from 1 to 40, y is any integer from 1 to 40, and z is any integer from 1 to 40.

[0013] The UV protection treatment and the waterproofing treatment can be performed simultaneously, or the UV protection treatment can be performed first, followed by the waterproofing treatment.

[0014] When the UV-resistant treatment and the waterproof treatment are performed simultaneously, the working fluid used in the padding process is prepared by mixing the UV-resistant finishing agent and the waterproof finishing agent in a mass ratio of 1:1.

[0015] In the preparation method, the alkali solution used in the alkali reduction treatment is a NaOH solution with a mass concentration of 6-8%.

[0016] The conditions for the alkali reduction treatment are: temperature 60-80℃, time 50-60 minutes. Alkali treatment loosens the fabric structure, which is more conducive to improving the subsequent waterproofing and UV resistance effects of padding.

[0017] In the UV-resistant finishing agent, the benzophenone-based UV absorber is 2-hydroxy-4-methoxybenzophenone and / or 2,4-dihydroxybenzophenone.

[0018] The dispersant is a polyethyleneimine derivative, such as dispersant FK-420 from Beijing Zhongfang Chemical Co., Ltd.

[0019] The stabilizer is a hydrophilic self-crosslinking polyurethane emulsion, such as the waterborne polyurethane finishing agent MFA from Beijing Zhongfang Chemical Co., Ltd.

[0020] The defoamer is an organosilicon defoamer, such as the water- and oil-repellent defoamer FK-300 from Beijing Zhongfang Chemical Co., Ltd.

[0021] The UV-resistant finishing agent is prepared according to the following steps: first, the benzophenone-based UV absorber is mixed with the stabilizer and water, stirred once, then the dispersant and defoamer are added, stirred a second time, and filtered.

[0022] The conditions for the first stirring are: a rotation speed of 70-150 rpm and a time of 20-30 min. The conditions for the second stirring are: a rotation speed of 100-200 rpm and a time of 20-30 min.

[0023] The waterproofing agent is prepared according to the following steps:

[0024] S1. Mix the monomer, emulsifier, solvent and water, then add the crosslinking agent, and shear to homogenize to obtain a pre-emulsion;

[0025] S2. Stir the pre-emulsion, then add initiator and water to carry out the polymerization reaction, and cool to room temperature to obtain the waterproof finishing agent.

[0026] In step S1, the polymerizing monomers are long-chain fatty alcohol acrylates, butyl acrylate, and methyl methacrylate. The mass ratio of the long-chain fatty alcohol acrylates, butyl acrylate, and methyl methacrylate is (0.4-0.5):(0.6-0.7):1.

[0027] In step S1, the long-chain acrylic fatty alcohol ester is hexadecyl acrylate and / or octadecyl acrylate.

[0028] In step S1, the emulsifier is a cationic surfactant. The amount of the emulsifier is 0.7-12% of the total mass of the polymeric monomers, preferably 3.5-9%.

[0029] In step S1, the cationic surfactant is one or more of dodecyl dimethyl benzyl ammonium chloride, octadecyl trimethyl ammonium chloride, and bis(dodecyl dimethyl ammonium chloride).

[0030] In step S1, the solvent is diethylene glycol diethyl ether.

[0031] In step S1, the mixing conditions are: a rotation speed of 200-300 rpm and a time of 20-30 min.

[0032] In step S1, the crosslinking agent is N-hydroxymethylacrylamide; the amount of the crosslinking agent is 0.8-10% of the total mass of the polymeric monomers, preferably 3.4-7.3%.

[0033] In step S1, the shearing conditions are: rotation speed of 2500-3000 rpm and time of 4-5 min.

[0034] In step S1, the homogenization conditions are as follows: the pressure in the low-pressure stage is 10 MPa and the time is 5-6 min, and the pressure in the high-pressure stage is 30 MPa and the time is 2-3 min.

[0035] In step S2, the stirring conditions are: temperature of 40-50℃, preferably 45℃, speed of 80-120rpm, preferably 100rpm, and time of 9-11min, preferably 10min.

[0036] In step S2, the initiator is azobisisobutyramidine hydrochloride. The initiator is added to the preemulsion in batches, preferably in three batches within one hour.

[0037] In step S2, the amount of the initiator is 10-15% of the total mass of the polymerizing monomers, preferably 10.4-12%. The mass ratio of the initiator to the water is 1:(20-50), preferably 1:35.

[0038] In step S2, the conditions for the polymerization reaction are: a temperature of 60-70℃, preferably 65℃, and a time of 3-5h, preferably 4h.

[0039] In the fabric preparation method, the padding process is a one-dip-one-padding process.

[0040] The conditions for the dip-rolling process are: a liquor ratio of 35-45 g / L, preferably 40 g / L, and a roll pressure of 1-4 kgf / cm. 2 The preferred value is 2.5 kgf / cm². 2 The vehicle speed is 30-50 m / min, preferably 40 m / min, and the liquid carrying rate is 30%-120%, preferably above 50%, and even more preferably above 70%.

[0041] The baking conditions are: temperature 160-180℃, preferably 170℃, and time 1-3 min, preferably 2 min.

[0042] The fabric is made of cotton, polyester-cotton blend, polyester or nylon woven together.

[0043] Secondly, the present invention further provides a composite fabric obtained by the preparation method.

[0044] The beneficial effects achieved by this invention are as follows:

[0045] 1. This invention selects benzophenone-based ultraviolet absorbers as anti-ultraviolet finishing agents, and selects specific dispersants, stabilizers and defoamers to be compatible with benzophenone-based ultraviolet absorbers based on their characteristics, thereby significantly improving the anti-ultraviolet efficacy of the absorber, resulting in better stability and higher fabric durability.

[0046] 2. This invention obtains a polymer with a specific structure through the polymerization of three monomers: long-chain fatty alcohol acrylate, butyl acrylate, and methyl methacrylate. This polymer not only has a significant waterproof effect, but can also be used in conjunction with benzophenone-based ultraviolet absorbers, simplifying the chemical finishing steps of the fabric. At the same time, due to the readily available and inexpensive raw materials and the simple synthesis method, the cost of the polymer waterproofing agent is lower than that of commercially available waterproofing agent compositions.

[0047] 3. The waterproofing agent and UV-resistant finishing agent used in this invention produce fabrics with a waterproof rating of 4 or higher, a UV protection factor (UPF) of 80-140, and excellent durability, capable of being washed at least 20 times. The processing is also simpler, making it suitable for industrial production and more practical. Detailed Implementation

[0048] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to the following embodiments.

[0049] Unless otherwise specified, all methods described herein are conventional methods.

[0050] Unless otherwise specified, all raw materials are available from publicly available commercial sources.

[0051] The reagents used in the following examples are of the following types and sources:

[0052] Stabilizer MFA: Waterborne polyurethane finishing agent MFA, purchased from Beijing Zhongfang Chemical Co., Ltd.

[0053] Dispersant FK-420: purchased from Beijing Zhongfang Chemical Co., Ltd.

[0054] Defoamer FK-300: Water- and oil-repellent defoamer, purchased from Beijing Zhongfang Chemical Co., Ltd.

[0055] Example 1

[0056] The preparation steps for composite functional fabrics are as follows:

[0057] S1. Preparation of Waterproofing Agent for Fabrics

[0058] 26g hexadecyl acrylate, 30g butyl acrylate, 54g methyl methacrylate, 12g dodecyl dimethyl ammonium chloride, 21g diethylene glycol diethyl ether and 155g deionized water were mixed to obtain a mixture, stirred at 200 rpm for 20 minutes, and then 10g N-hydroxymethyl acrylamide and 10g deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0059] Add the pre-emulsion to a flask, heat to 45°C, and stir at 100 rpm for 10 minutes. Add 15g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65°C for 4 hours. After the reaction is complete, cool the system to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0060] S2. Preparation of UV-resistant finishing agents for fabrics

[0061] Mix 10g of 2-hydroxy-4-methoxybenzophenone, 10g of 2,4-dihydroxybenzophenone, 24g of stabilizer MFA and 210g of deionized water, and stir at 150 rpm for 24 minutes; then add 8g of dispersant FK-420 and 2g of defoamer FK-300, set the stirring speed to 200 rpm and stir for 20 minutes; turn off the stirring, filter and obtain the fabric anti-UV finishing agent.

[0062] S3, Alkali Reduction Treatment

[0063] At a high temperature of 67°C, polyester fabric is immersed in a 6.5% caustic soda solution for 60 minutes. After the fabric surface is etched by the alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0064] S4, Waterproof and UV-resistant treatment

[0065] The alkali-reduced fabric is impregnated with the working solution and then baked.

[0066] The immersion rolling process employs a one-dip-one-roll process, with a roll pressure of 2.5 kgf / cm. 2 The vehicle speed is 40 m / min;

[0067] The working solution is prepared by mixing a fluorine-free waterproofing agent and an anti-UV finishing agent in a 1:1 mass ratio; the bath ratio is 40 g / L, and the liquid retention rate is over 70%; it is baked at 170℃ for 2 minutes.

[0068] Example 2

[0069] The preparation steps for composite functional fabrics are as follows:

[0070] S1. Preparation of Waterproofing Agent for Fabrics

[0071] 14g hexadecyl acrylate, 7g octadecyl acrylate, 40g butyl acrylate, 64g methyl methacrylate, 8g octadecyltrimethylammonium chloride, 40g diethylene glycol diethyl ether and 110g deionized water were mixed to obtain a mixture. The mixture was stirred at 300 rpm for 25 minutes. Then, 1g N-hydroxymethylacrylamide and 10g deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0072] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 13g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in 3 portions over 1 hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0073] S2. Preparation of UV-resistant finishing agents for fabrics

[0074] Mix 20g of 2,4-dihydroxybenzophenone, 21g of MFA and 190g of deionized water and stir at 70rpm for 20 minutes; add 7g of FK-420 and 1g of FK-300, set the stirring speed to 200rpm and stir for 20 minutes; turn off the stirring and filter to obtain the fabric UV-resistant finishing agent.

[0075] S3, Alkali Reduction Treatment

[0076] At a high temperature of 73°C, polyester fabric is immersed in an 8% caustic soda solution for 55 minutes. After the fabric surface is etched by the alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0077] S4, UV resistant treatment

[0078] The alkali-reduced fabric is impregnated with the working solution and then baked.

[0079] The immersion rolling process employs a one-dip-one-roll process, with a roll pressure of 2.5 kgf / cm. 2 The vehicle speed is 40 m / min;

[0080] The working solution is an anti-UV finishing agent, the bath ratio is 40g / L, the liquid retention rate is measured to be over 70%, and it is baked at 170℃ for 2 minutes;

[0081] S5, Waterproofing

[0082] The UV-resistant fabric was treated with a fluorine-free waterproofing agent at a liquor ratio of 40 g / L using a one-dip-one-nip process. After treatment, the liquid retention rate was measured to be over 70%, and the fabric was baked at 170℃ for 2 minutes. The fabric treated with the waterproofing agent became waterproof.

[0083] Example 3

[0084] The preparation steps for composite functional fabrics are as follows:

[0085] S1. Preparation of fabric waterproofing finishing agent

[0086] 14g hexadecyl acrylate, 14g octadecyl acrylate, 35g butyl acrylate, 54g methyl methacrylate, 1g dodecyl dimethyl benzyl ammonium chloride, 35g diethylene glycol diethyl ether, and 147g deionized water were mixed to obtain a mixture. The mixture was stirred at 248 rpm for 30 minutes. Then, 4g N-hydroxymethyl acrylamide and 10g deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0087] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 12g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0088] S2, Preparation of UV-resistant finishing agents for fabrics

[0089] Mix 12g of 2-hydroxy-4-methoxybenzophenone, 6g of 2,4-dihydroxybenzophenone, 26g of MFA and 206g of deionized water, and stir at 118 rpm for 30 minutes; add 8g of FK-420 and 2g of FK-300, set the stirring speed to 200 rpm, and stir for 20 minutes; turn off the stirring, filter, and obtain the fabric UV-resistant finishing agent.

[0090] S3, Alkali Reduction Treatment

[0091] At a high temperature of 80℃, polyester fabric is immersed in a caustic soda solution with a mass concentration of 8% for 50 minutes. After the fabric surface is etched by alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0092] S4, UV resistant treatment

[0093] The alkali-reducing fabric was treated with an anti-UV finishing agent at a liquor ratio of 40 g / L using a one-dip-one-paste process; the pad pressure was 2.5 kgf / cm.2 The speed of the vehicle was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and it was baked at 170℃ for 2 minutes; the fabric treated with the anti-ultraviolet finishing agent has anti-ultraviolet properties.

[0094] S5, Waterproofing

[0095] The UV-resistant fabric was treated with a fluorine-free waterproofing agent at a liquor ratio of 40 g / L using a one-dip-one-nip process. After treatment, the liquid retention rate was measured to be over 70%, and the fabric was baked at 170℃ for 2 minutes. The fabric treated with the waterproofing agent became waterproof.

[0096] Example 4

[0097] The preparation steps for composite functional fabrics are as follows:

[0098] S1. Preparation of fabric waterproofing finishing agent

[0099] 21g hexadecyl acrylate, 32g butyl acrylate, 80g methyl methacrylate, 12g dodecyl dimethyl ammonium chloride, 26g diethylene glycol diethyl ether and 120g deionized water were mixed to obtain a mixture. The mixture was stirred at 200 rpm for 26 minutes. Then, 5g N-hydroxymethyl acrylamide and 10g deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0100] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 15g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0101] S2, Preparation of UV-resistant finishing agents for fabrics

[0102] Mix 15g of 2-hydroxy-4-methoxybenzophenone, 26g of MFA and 230g of deionized water, and stir at 70 rpm for 30 minutes; add 6g of FK-420 and 1g of FK-300, set the stirring speed to 200 rpm and stir for 20 minutes; turn off the stirring and filter to obtain the fabric UV-resistant finishing agent.

[0103] S3, Alkali Reduction Treatment

[0104] At a high temperature of 75°C, polyester fabric is immersed in a 6% caustic soda solution for 56 minutes. After the fabric surface is etched by the alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0105] S4, Waterproof and UV-resistant treatment

[0106] Fabrics treated with alkali reduction were treated with a working solution prepared by mixing a fluorine-free waterproofing agent and an anti-UV finishing agent in a 1:1 mass ratio, with a liquor ratio of 40 g / L, using a one-dip-one-paste process; the padding pressure was 2.5 kgf / cm. 2 The speed of the vehicle was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and it was baked at 170℃ for 2 minutes; the fabric treated with the prepared working solution has both waterproof and UV-resistant properties.

[0107] Example 5

[0108] The preparation steps for composite functional fabrics are as follows:

[0109] S1. Preparation of fabric waterproofing finishing agent

[0110] 8g hexadecyl acrylate, 16g octadecyl acrylate, 46g butyl acrylate, 66g methyl methacrylate, 7g dodecyl dimethyl benzyl ammonium chloride, 10g diethylene glycol diethyl ether, and 144g deionized water were mixed to obtain a mixture. The mixture was stirred at 261 rpm for 22 minutes. Then, 10g N-hydroxymethyl acrylamide and 10g deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0111] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 14g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0112] S2, Preparation of UV-resistant finishing agents for fabrics

[0113] Mix 6.8g of 2-hydroxy-4-methoxybenzophenone, 10.2g of 2,4-dihydroxybenzophenone, 22g of MFA and 235g of deionized water, and stir at 146 rpm for 28 minutes; add 8g of FK-420 and 2g of FK-300, set the stirring speed to 200 rpm and stir for 20 minutes; turn off the stirring, filter and obtain the fabric UV-resistant finishing agent.

[0114] S3, Alkali Reduction Treatment

[0115] At a high temperature of 68°C, polyester fabric is immersed in a 7.4% caustic soda solution for 60 minutes. After the fabric surface is etched by alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0116] S4, UV resistant treatment

[0117] The alkali-reducing fabric was treated with an anti-UV finishing agent at a liquor ratio of 40 g / L using a one-dip-one-paste process; the pad pressure was 2.5 kgf / cm. 2 The speed of the vehicle was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and it was baked at 170℃ for 2 minutes; the fabric treated with the anti-ultraviolet finishing agent has anti-ultraviolet properties.

[0118] S5, Waterproofing

[0119] The UV-resistant fabric was treated with a fluorine-free waterproofing agent at a liquor ratio of 40 g / L using a one-dip-one-paste process; the padding pressure was 2.5 kgf / cm. 2 The vehicle speed was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and the fabric was baked at 170℃ for 2 minutes; the fabric treated with the waterproofing agent has a waterproof effect.

[0120] Example 6

[0121] The preparation steps for composite functional fabrics are as follows:

[0122] S1. Preparation of fabric waterproofing finishing agent

[0123] 8g hexadecyl acrylate, 16g octadecyl acrylate, 46g butyl acrylate, 66g methyl methacrylate, 7g dodecyl dimethyl benzyl ammonium chloride, 10g diethylene glycol diethyl ether, and 144g deionized water were mixed to obtain a mixture. The mixture was stirred at 261 rpm for 22 minutes. Then, 10g N-hydroxymethyl acrylamide and 10g deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0124] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 14g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0125] S2, Preparation of UV-resistant finishing agents for fabrics

[0126] Mix 17g of 2-hydroxy-4-methoxybenzophenone, 22g of MFA and 235g of deionized water, and stir at 146 rpm for 20 minutes; add 7g of FK-420 and 2g of FK-300, set the stirring speed to 200 rpm and stir for 20 minutes; turn off the stirring and filter to obtain the fabric UV-resistant finishing agent.

[0127] S3, Alkali Reduction Treatment

[0128] At a high temperature of 64°C, polyester fabric was immersed in a 6.8% caustic soda solution for 58 minutes. After the fabric surface was etched by the alkali, its mass was reduced, the surface of the fabric became uneven, the aurora of the fabric was eliminated, the gaps at the interlacing points of the fabric were increased, the fabric felt soft and had a soft luster, and the fabric structure became loose, which laid the foundation for subsequent waterproof and UV-resistant treatment.

[0129] S4, Waterproof and UV-resistant treatment

[0130] Fabrics treated with alkali reduction were treated with a working solution prepared by mixing a fluorine-free waterproofing agent and an anti-UV finishing agent in a 1:1 mass ratio, with a liquor ratio of 40 g / L, using a one-dip-one-paste process; the padding pressure was 2.5 kgf / cm. 2 The speed of the vehicle was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and it was baked at 170℃ for 2 minutes; the fabric treated with the prepared working solution has both waterproof and UV-resistant properties.

[0131] Example 7

[0132] The preparation steps for composite functional fabrics are as follows:

[0133] S1. Preparation of fabric waterproofing finishing agent

[0134] 25g of octadecyl acrylate, 32g of butyl acrylate, 75g of methyl methacrylate, 1g of octadecyltrimethylammonium chloride, 40g of diethylene glycol diethyl ether and 128g of deionized water were mixed to obtain a mixture. The mixture was stirred at 205 rpm for 30 minutes. Then, 8g of N-hydroxymethylacrylamide and 10g of deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0135] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 15g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0136] S2, Preparation of UV-resistant finishing agents for fabrics

[0137] Mix 12g of 2-hydroxy-4-methoxybenzophenone, 8g of 2,4-dihydroxybenzophenone, 20g of MFA and 200g of deionized water, and stir at 130 rpm for 30 minutes; add 8g of FK-420 and 2g of FK-300, set the stirring speed to 200 rpm and stir for 20 minutes; turn off the stirring, filter and obtain the fabric UV-resistant finishing agent.

[0138] S3, Alkali Reduction Treatment

[0139] At a high temperature of 65°C, polyester fabric is immersed in a 7% caustic soda solution for 53 minutes. After the fabric surface is etched by the alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0140] S4, UV resistant treatment

[0141] The alkali-reducing fabric was treated with an anti-UV finishing agent at a liquor ratio of 40 g / L using a one-dip-one-paste process; the pad pressure was 2.5 kgf / cm. 2 The speed of the vehicle was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and it was baked at 170℃ for 2 minutes; the fabric treated with the anti-ultraviolet finishing agent has anti-ultraviolet properties.

[0142] S5, Waterproofing

[0143] The UV-resistant fabric was treated with a fluorine-free waterproofing agent at a liquor ratio of 40 g / L using a one-dip-one-paste process; the padding pressure was 2.5 kgf / cm. 2 The vehicle speed was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and the fabric was baked at 170℃ for 2 minutes; the fabric treated with the waterproofing agent has a waterproof effect.

[0144] Example 8

[0145] The preparation steps for composite functional fabrics are as follows:

[0146] S1. Preparation of fabric waterproofing finishing agent

[0147] 25g hexadecyl acrylate, 32g butyl acrylate, 75g methyl methacrylate, 1g octadecyltrimethylammonium chloride, 40g diethylene glycol diethyl ether and 128g deionized water were mixed to obtain a mixture. The mixture was stirred at 205 rpm for 30 minutes. Then, 8g N-hydroxymethylacrylamide and 10g deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0148] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 15g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0149] S2, Preparation of UV-resistant finishing agents for fabrics

[0150] Mix 20g of 2,4-dihydroxybenzophenone, 20g of MFA and 200g of deionized water, and stir at 120rpm for 30 minutes; add 6g of FK-420 and 2g of FK-300, set the stirring speed to 200rpm and stir for 20 minutes; turn off the stirring and filter to obtain the fabric UV-resistant finishing agent.

[0151] S3, Alkali Reduction Treatment

[0152] At a high temperature of 80℃, polyester fabric is immersed in a 6% caustic soda solution for 50 minutes. After the fabric surface is etched by the alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0153] S4, UV resistant treatment

[0154] The alkali-reducing fabric was treated with an anti-UV finishing agent at a liquor ratio of 40 g / L using a one-dip-one-paste process; the pad pressure was 2.5 kgf / cm. 2 The speed of the vehicle was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and it was baked at 170℃ for 2 minutes; the fabric treated with the anti-ultraviolet finishing agent has anti-ultraviolet properties.

[0155] S5, Waterproofing

[0156] The UV-resistant fabric was treated with a fluorine-free waterproofing agent at a liquor ratio of 40 g / L using a one-dip-one-paste process; the padding pressure was 2.5 kgf / cm. 2 The vehicle speed was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and the fabric was baked at 170℃ for 2 minutes; the fabric treated with the waterproofing agent has a waterproof effect.

[0157] Example 9

[0158] The preparation steps for composite functional fabrics are as follows:

[0159] S1. Preparation of fabric waterproofing finishing agent

[0160] 24g of octadecyl acrylate, 30g of butyl acrylate, 57g of methyl methacrylate, 5g of dodecyl dimethyl ammonium chloride, 19g of diethylene glycol diethyl ether and 175g of deionized water were mixed to obtain a mixture. The mixture was stirred at 200 rpm for 25 minutes. Then, 1g of N-hydroxymethyl acrylamide and 10g of deionized water were added. The mixture was emulsified by a shear mill and a homogenizer to obtain a pre-emulsion.

[0161] Add the pre-emulsion to a flask, set the temperature to 45℃, and stir at 100 rpm for 10 minutes; add 12g of azobisisobutyramidine hydrochloride solution to the pre-emulsion in three portions over one hour, and react at 65℃ for 4 hours; after the reaction is complete, lower the system temperature to room temperature, filter, and obtain the fabric waterproofing finishing agent.

[0162] S2, Preparation of UV-resistant finishing agents for fabrics

[0163] Mix 5g of 2-hydroxy-4-methoxybenzophenone, 10g of 2,4-dihydroxybenzophenone, 26g of MFA and 196g of deionized water, and stir at 150 rpm for 22 minutes; add 8g of FK-420 and 1g of FK-300, set the stirring speed to 200 rpm and stir for 20 minutes; turn off the stirring, filter and obtain the fabric UV-resistant finishing agent.

[0164] S3, Alkali Reduction Treatment

[0165] At a high temperature of 60°C, polyester fabric is immersed in a 7.7% caustic soda solution for 54 minutes. After the fabric surface is etched by the alkali, its mass is reduced, the surface of the fabric becomes uneven, the aurora of the fabric is eliminated, the gaps at the interlacing points of the fabric are increased, the fabric feels soft and has a soft luster, and the fabric structure becomes loose after treatment, which lays the foundation for subsequent waterproof and UV-resistant treatment.

[0166] S4, Waterproof and UV-resistant treatment

[0167] Fabrics treated with alkali reduction were treated with a working solution prepared by mixing a fluorine-free waterproofing agent and an anti-UV finishing agent in a 1:1 mass ratio, with a liquor ratio of 40 g / L, using a one-dip-one-paste process; the padding pressure was 2.5 kgf / cm. 2 The speed of the vehicle was 40m / min; after treatment, the liquid retention rate was measured to be over 70%, and it was baked at 170℃ for 2 minutes; the fabric treated with the prepared working solution has both waterproof and UV-resistant properties.

[0168] Effect test

[0169] 1. Waterproof and UV resistant properties

[0170] The waterproof and UV-resistant properties of the fabric samples obtained in Examples 1-9 were tested, as shown in Table 1.

[0171] Test method for waterproof performance: GB / T 4745-2012 "Test and evaluation of waterproof performance of textiles - water-soaking method".

[0172] Test method for UV protection performance: GB / T 18830-2009 "Evaluation of UV protection performance of textiles".

[0173] Table 1. Waterproof rating, UPF, and UVA transmittance results of the samples.

[0174] sample Waterproof rating Ultraviolet UPF UVA transmittance Example 1 5 107 ＜5％ Example 2 5 121 ＜5％ Example 3 5 138 ＜5％ Example 4 4 89 ＜5％ Example 5 5 123 ＜5％ Example 6 4 95 ＜5％ Example 7 5 140 ＜5％ Example 8 5 102 ＜5％ Example 9 4 96 ＜5％

[0175] As shown in Table 1, this invention optimizes the formulation and preparation method of the waterproofing agent and the UV-resistant finishing agent, thereby achieving the preparation of fabrics with excellent waterproof and UV-resistant functions.

[0176] 2. Durability test:

[0177] The test method is as follows: The fabric samples obtained in Examples 1-9 are first washed and dried, and then their ultraviolet UPF and UVA transmittance are tested.

[0178] The washing process conditions are: temperature 40℃, washing liquid is Tide laundry detergent with a concentration of 1g / L, and washing time is 15min / cycle;

[0179] The drying conditions were: temperature 65℃, time 40 min.

[0180] Test method for UV protection performance: GB / T 18830-2009 "Evaluation of UV Protection Performance of Textiles", results are as follows:

[0181] Table 2. Results of UV UPF test.

[0182]

[0183] Table 3 UVA transmittance test results

[0184]

[0185]

[0186] a represents unwashed fabric, b represents 5 washes, c represents 10 washes, and d represents 20 washes.

[0187] As can be seen from the results in Tables 2 and 3, the finishing effect of the method described in this invention has excellent durability. Even after 20 washes, it still maintains a high ultraviolet UPF and UVA transmittance.

[0188] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for preparing a fabric, comprising the following steps: subjecting the greige fabric to alkali reduction treatment, then subjecting the greige fabric to UV resistance and waterproofing treatment using a padding process, and baking; The UV-resistant finishing agent used in the UV-resistant treatment comprises the following components: 100 parts of benzophenone-based UV absorber, 20-90 parts of dispersant, 80-230 parts of stabilizer, 4-15 parts of defoamer, and 800-1800 parts of water. The benzophenone-based ultraviolet absorber is 2-hydroxy-4-methoxybenzophenone and / or 2,4-dihydroxybenzophenone; The dispersant is a polyethyleneimine derivative; The stabilizer is a hydrophilic self-crosslinking polyurethane emulsion; The defoamer is an organosilicon defoamer; The waterproofing agent used in the waterproofing treatment is a polymer, and its structural formula is as follows: Where x, y, and z represent the degree of aggregation, where x is any integer from 1 to 40, y is any integer from 1 to 40, and z is any integer from 1 to 40.

2. The preparation method according to claim 1, characterized in that: The UV protection treatment and the waterproofing treatment are performed simultaneously, or the UV protection treatment is performed first and then the waterproofing treatment is performed.

3. The preparation method according to claim 1 or 2, characterized in that: The waterproofing agent is prepared according to the following steps: S1. Mix the monomer, emulsifier, solvent and water, then add the crosslinking agent, and shear to homogenize to obtain a pre-emulsion; S2. Stir the pre-emulsion, then add initiator and water to carry out the polymerization reaction, and cool to room temperature to obtain the waterproof finishing agent.

4. The preparation method according to claim 3, characterized in that: In step S1, the polymerizing monomers are long-chain fatty alcohol acrylates, butyl acrylates, and methyl methacrylates; The mass ratio of the long-chain acrylate fatty alcohol ester, butyl acrylate, and methyl methacrylate is (0.4-0.5):(0.6-0.7):1; The long-chain acrylic fatty alcohol ester is hexadecyl acrylate and / or octadecyl acrylate; The emulsifier is a cationic surfactant; The amount of the emulsifier is 0.7-12% of the total mass of the polymeric monomers; The cationic surfactant is one or more of dodecyl dimethyl benzyl ammonium chloride, octadecyl trimethyl ammonium chloride, and didodecyl dimethyl ammonium chloride; The solvent is diethylene glycol diethyl ether; The crosslinking agent is N-hydroxymethylacrylamide; The amount of the crosslinking agent is 0.8-10% of the total mass of the polymeric monomers; The mixing conditions are: rotation speed of 200-300 rpm and time of 20-30 min; The shearing conditions are: rotation speed of 2500-3000 rpm and time of 4-5 min; The homogenization conditions are as follows: the pressure in the low-pressure stage is 10 MPa and the time is 5-6 min; the pressure in the high-pressure stage is 30 MPa and the time is 2-3 min.

5. The preparation method according to claim 3, characterized in that: In step S2, the stirring conditions are: temperature 40-50℃, rotation speed 80-120 rpm, and time 9-11 min; The initiator is azobisisobutyramidine hydrochloride; The initiator is added to the preemulsion in batches; The amount of the initiator is 10-15% of the total mass of the polymerizing monomers; The mass ratio of the initiator to the water is 1:(20-50); The polymerization reaction conditions are: temperature 60-70℃, time 3-5h.

6. The preparation method according to claim 1, characterized in that: The immersion rolling process is a one-immersion-one-rolling process; The conditions for the dip-rolling process are: a liquor ratio of 35-45 g / L and a roll pressure of 1-4 kgf / cm. 2 The vehicle speed is 30-50 m / min, and the liquid carrying rate is 30%-120%.

7. The preparation method according to claim 1, characterized in that: The baking conditions are: temperature 160-180℃, time 1-3 min.

8. The fabric obtained by the preparation method according to any one of claims 1-7.

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