A stain-resistant coating for fabrics and its preparation method

Abstract

This invention discloses a stain-resistant coating for fabrics and its preparation method. The invention utilizes modified nano-silica surface fluorinated alkyl groups to form a dual oleophobic system with fluorinated polyether modified acrylate fluorinated polyether segments. This significantly reduces the surface energy of the coating, making it difficult for oil stains to adhere to the fabric surface and allowing them to roll off easily. Furthermore, the hollow structure of the mesoporous silica microspheres reduces the actual contact area between oil stains and the fabric. The surface mesopores also synergistically work with the three-dimensional network structure formed by the crosslinking agent to construct multi-level breathable channels, ensuring good air circulation in the fabric. This results in a fabric coating that combines excellent stain resistance with good breathability. The invention also uses plant-derived dispersants, polyglycerol castor oil, and high-purity ethanol, ensuring that the coating has no irritating odor during preparation and application, making it environmentally friendly and suitable for operators.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to an anti-fouling coating for fabrics and its preparation method. Background Technology

[0002] In the field of fabric application, stain resistance is one of the key indicators for improving the practicality and service life of fabrics. The common fabric stain resistance treatment methods in existing technologies are mainly divided into two categories: surface coating type and fiber modification type.

[0003] Surface-coated stain-resistant technologies typically achieve oil and stain barrier effects by forming a dense stain-resistant film on the fabric surface. However, these technologies generally suffer from poor breathability of the stain-resistant film. The dense film structure hinders air exchange between the fabric and the outside environment, leading to stuffiness and lack of breathability during use, making it particularly unsuitable for clothing and other close-fitting fabrics. Fiber-modified stain-resistant technologies, on the other hand, introduce stain-resistant groups by chemically modifying the fabric fibers themselves. While this can avoid the breathability problem of surface-coated technologies to some extent, the degree of fiber modification is difficult to control precisely. Insufficient modification results in poor stain resistance, while excessive modification damages the original physical structure of the fibers, reducing the fabric's tensile strength and softness, and affecting its basic performance characteristics.

[0004] Based on the above reasons, this invention proposes a stain-resistant coating for fabrics and its preparation method, which enables the fabric coating to have both excellent stain resistance and good breathability, meeting the needs of multi-performance synergy in daily life scenarios. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention modifies the fluoroalkyl groups on the surface of nano-silica to form a dual oleophobic system with the fluoropolyether segments of fluorinated polyether-modified acrylate. This significantly reduces the surface energy of the coating, making it difficult for oil stains to adhere to the fabric surface and allowing them to roll off easily. Furthermore, the hollow structure of the mesoporous silica microspheres reduces the actual contact area between oil stains and the fabric. The surface mesopores also synergize with the three-dimensional network structure formed by the crosslinking agent to create multi-level breathable channels, ensuring good air circulation in the fabric. This results in a fabric coating that also possesses excellent stain resistance. Performance and good breathability: This invention uses plant-derived dispersants, polyglycerol ricinoleate, and high-purity ethanol to ensure that the coating has no irritating odor during preparation and application, making it environmentally friendly and friendly to operators. Furthermore, the double bonds of the fluorinated polyether modified acrylate will undergo a copolymerization reaction with the hydroxyl groups of the waterborne polyurethane emulsion and the silicone resin, firmly fixing the fluorine component in the coating and preventing the loss of fluorine component during water washing. At the same time, the special structure of the silicone resin can enhance the hydrolysis resistance of the coating, improving the long-term anti-fouling performance of the coating even after multiple water washes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stain-resistant coating for fabrics, comprising the following components (by mass parts): 18-28 parts modified nano-silica, 25-50 parts waterborne polyurethane emulsion, 8-15 parts organosilicon resin, 3-8 parts plant-derived dispersant, 10-15 parts ethanol, 15-20 parts deionized water, 1.5-4.5 parts crosslinking agent, 7-12 parts fluorinated polyether modified acrylate, 4-10 parts hollow mesoporous silica microspheres, and 1-5 parts polyglycerol ricinoleate.

[0007] Preferably, the modified nano-silica is prepared by modifying nano-silica with KH-550 silane coupling agent and fluoroalkyl phosphate, wherein the amount of KH-550 silane coupling agent is 5-8% of the mass of nano-silica, the amount of fluoroalkyl phosphate is 3-6% of the mass of nano-silica, and the particle size of nano-silica is 50-100 nm.

[0008] Preferably, the fluorinated polyether modified acrylate has a number average molecular weight of 2000-3000, a fluorine content of 25-30%, and the molecule contains fluorinated polyether segments and acrylate double bonds.

[0009] Preferably, the hollow mesoporous silica microspheres and modified nano-silica are graded by 200-300nm hollow particles and 50-100nm solid particles. The hollow mesoporous silica microspheres have a particle size of 200-300nm, a hollowness of 40-50%, and a mesopore size of 2-5nm.

[0010] Preferably, the polyglycerol ricinoleate has a hydrophilic-lipophilic balance value of 8-10, and the polyglycerol ricinoleate is prepared by esterification reaction of castor oil and polyglycerol, and the molecule contains polyhydroxyl groups and long-chain fatty acid ester groups.

[0011] Preferably, the organosilicon grease is hydroxyl-terminated polydimethylsiloxane, the plant-derived dispersant is a mixture of tea saponin and gum arabic in a mass ratio of 2:1, the ethanol has a purity of 95% or higher, and the crosslinking agent is an isocyanate crosslinking agent.

[0012] A method for preparing a stain-resistant coating for fabrics, comprising the following steps: S1: Pretreatment of hollow mesoporous silica microspheres: Add hollow mesoporous silica microspheres to deionized water, add 0.5-1 part of polyglycerol ricinoleate, stir at 200-300 r / min for 10 minutes to form a stable dispersion for later use; S2: To prepare modified nano-silica, nano-silica was added to a solvent of ethanol and deionized water and ultrasonically dispersed for 15-25 minutes at a frequency of 20-30 kHz to obtain a nano-silica dispersion. KH-550 silane coupling agent was added to the dispersion and stirred at 60-70℃ for 2-3 hours. Then, fluoroalkyl phosphate was added, and the temperature was raised to 75-85℃ and the reaction was continued with stirring for 1.5-2.5 hours. After the reaction was completed, the mixture was centrifuged at 8000-10000 r / min for 10-15 minutes. The precipitate was washed with ethanol 3-4 times and dried at 80-90℃ for 2-3 hours to obtain modified nano-silica. S3: Mix the basic components. Add the aqueous polyurethane emulsion to the reactor and stir at 300-400 r / min. Add the plant-derived dispersant and the remaining polyglycerol ricinoleate in sequence, with a mass ratio of 1:2-3, and stir for 10 minutes. Then add the silicone resin and fluorinated polyether modified acrylate, heat to 50-55℃ and stir for 15 minutes. Subsequently, add the modified nano silica and the hollow mesoporous silica dispersion prepared in S1, reduce the speed to 450-500 r / min, and stir for 25-30 minutes to form a mixture. S4: Adjustment and crosslinking. Add ethanol to the mixture obtained in S3 and stir at 400-500 r / min for 10-15 minutes to adjust the viscosity of the mixture to 200-300 mPa·s. Then add the crosslinking agent, control the temperature inside the reactor to 40-50℃, and continue stirring for 25-35 minutes. After stirring, let it stand at room temperature for 1-2 hours to remove bubbles and obtain the antifouling coating for fabrics.

[0013] Preferably, in step S1, the hollow mesoporous silica microspheres account for 1 / 3 of the total deionized water, and in step S2, the nano-silica and deionized water are mixed at a mass ratio of 3:1.

[0014] Compared with existing technologies, this invention provides a stain-resistant coating for fabrics and its preparation method, which has the following beneficial effects: This invention modifies the fluoroalkyl groups on the surface of nano-silica to form a dual oleophobic system with the fluoropolyether segments of fluorinated polyether-modified acrylate, significantly reducing the surface energy of the coating, making it difficult for oil stains to adhere to the fabric surface and easy to roll off. Furthermore, the hollow structure of the hollow mesoporous silica microspheres reduces the actual contact area between oil stains and the fabric. The surface mesopores also synergistically work with the three-dimensional network structure formed by the crosslinking agent to construct multi-level breathable channels, ensuring good airflow in the fabric. The general properties of the coating give it both excellent stain resistance and good breathability. This invention uses plant-derived dispersants, polyglycerol ricinoleate, and high-purity ethanol to ensure the coating has no irritating odor during preparation and application, making it environmentally friendly and suitable for operators. Furthermore, the double bonds of the fluorinated polyether-modified acrylate undergo a copolymerization reaction with the hydroxyl groups of the waterborne polyurethane emulsion and silicone resin, firmly fixing the fluorine component within the coating and preventing its loss during washing. Simultaneously, the special structure of the silicone resin enhances the coating's hydrolysis resistance, improving its long-term stain resistance even after multiple washes. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the preparation process of the antifouling coating of the present invention. Detailed Implementation

[0016] To better understand the purpose, structure, and function of this invention, and to achieve the stain resistance and breathability of the coated fabric, this invention modifies the fluoroalkyl groups on the surface of nano-silica to form a dual oleophobic system with the fluoropolyether segments of fluoropolyether-modified acrylate. This significantly reduces the surface energy of the coating, making it difficult for oil stains to adhere to the fabric surface and allowing them to roll off easily. Furthermore, the hollow structure of the mesoporous silica microspheres reduces the actual contact area between oil stains and the fabric. The surface mesopores also synergistically work with the three-dimensional network structure formed by the crosslinking agent to construct multi-level breathable channels, ensuring good airflow in the fabric. The general properties of the coating allow it to possess both excellent stain resistance and good breathability. This invention utilizes plant-derived dispersants, polyglycerol ricinoleate, and high-purity ethanol to ensure the coating produces no irritating odor during preparation and application, making it environmentally friendly and suitable for operators. Furthermore, the double bonds of the fluorinated polyether-modified acrylate undergo a copolymerization reaction with the hydroxyl groups of the waterborne polyurethane emulsion and silicone resin, firmly fixing the fluorine component within the coating and preventing its loss during washing. Simultaneously, the special structure of the silicone resin enhances the coating's hydrolysis resistance, improving its long-term stain resistance even after multiple washes. The present invention provides a more detailed description of a stain-resistant coating for fabrics and its preparation method. Example

[0017] refer to Figure 1This invention relates to a stain-resistant coating for fabrics, comprising the following components (by mass): 18 parts modified nano-silica, 25 parts waterborne polyurethane emulsion, 8 parts organosilicon resin, 3 parts plant-derived dispersant, 10 parts ethanol, 15 parts deionized water, 1.5 parts crosslinking agent, 7 parts fluorinated polyether modified acrylate, 4 parts hollow mesoporous silica microspheres, and 1 part polyglycerol ricinoleate.

[0018] Specifically, the fluorinated polyether modified acrylate has a number average molecular weight of 2000-3000, a fluorine content of 28%, and contains fluorinated polyether segments and acrylate double bonds. The hollow mesoporous silica microspheres and modified nano-silica are graded by 200-300nm hollow particles and 50-100nm solid particles. The hollow mesoporous silica microspheres have a particle size of 200-300nm, a hollowness of 40-50%, and a mesopore size of 2-5nm. The polyglycerol ricinoleate has a hydrophilic-lipophilic balance value of 9 and is obtained by esterification reaction of castor oil and polyglycerol. The molecule contains polyhydroxyl groups and long-chain fatty acid ester groups. The organosilicon is hydroxyl-terminated polydimethylsiloxane. The plant-derived dispersant is a mixture of tea saponin and gum arabic in a mass ratio of 2:1. The ethanol has a purity of 98%. The crosslinking agent is an isocyanate crosslinking agent.

[0019] A method for preparing a stain-resistant coating for fabrics, comprising the following steps: S1: Pretreatment of hollow mesoporous silica microspheres: Hollow mesoporous silica microspheres are added to deionized water, with the hollow mesoporous silica microspheres accounting for 1 / 3 of the total deionized water volume. 0.5 parts of polyglycerol ricinoleate are added, and the mixture is stirred at 250 r / min for 10 minutes to form a stable dispersion for later use. S2: Preparation of modified nano-silica: Nano-silica was added to a solvent of ethanol and deionized water at a mass ratio of 3:1 and ultrasonically dispersed for 20 minutes at a frequency of 25 kHz to obtain a nano-silica dispersion. KH-550 silane coupling agent was added to the dispersion and stirred at 65°C for 2.5 hours. Then, fluoroalkyl phosphate was added, and the temperature was raised to 80°C and stirred for another 2 hours. After the reaction was completed, the mixture was centrifuged at 9000 r / min for 12 minutes. The precipitate was washed three times with ethanol and dried at 85°C for 2.5 hours to obtain modified nano-silica. S3: Mix the basic components. Add the aqueous polyurethane emulsion to the reactor and stir at 350 r / min. Add the plant-derived dispersant and the remaining polyglycerol ricinoleate in sequence, with a mass ratio of 1:2.5, and stir for 10 minutes. Then add the silicone resin and fluorinated polyether modified acrylate, heat to 55℃ and stir for 15 minutes. Subsequently, add the modified nano silica and the hollow mesoporous silica dispersion prepared in S1, reduce the speed to 475 r / min and stir for 28 minutes to form a mixture. S4: Adjustment and crosslinking. Add ethanol to the mixture obtained in S3 and stir for 12 minutes at 450 r / min to adjust the viscosity of the mixture to 250 mPa·s. Then add the crosslinking agent, control the temperature inside the reactor to 45℃, and continue stirring for 30 minutes. After stirring, let it stand at room temperature for 1.5 hours to remove bubbles and obtain the antifouling coating for fabric. Example

[0020] refer to Figure 1 This invention relates to a stain-resistant coating for fabrics, comprising the following components (by mass): 23 parts modified nano-silica, 33 parts waterborne polyurethane emulsion, 12 parts organosilicon resin, 5 parts plant-derived dispersant, 13 parts ethanol, 18 parts deionized water, 3 parts crosslinking agent, 10 parts fluorinated polyether modified acrylate, 7 parts hollow mesoporous silica microspheres, and 3 parts polyglycerol ricinoleate.

[0021] Specifically, the fluorinated polyether modified acrylate has a number average molecular weight of 2000-3000, a fluorine content of 28%, and contains fluorinated polyether segments and acrylate double bonds. The hollow mesoporous silica microspheres and modified nano-silica are graded by 200-300nm hollow particles and 50-100nm solid particles. The hollow mesoporous silica microspheres have a particle size of 200-300nm, a hollowness of 40-50%, and a mesopore size of 2-5nm. The polyglycerol ricinoleate has a hydrophilic-lipophilic balance value of 9 and is obtained by esterification reaction of castor oil and polyglycerol. The molecule contains polyhydroxyl groups and long-chain fatty acid ester groups. The organosilicon is hydroxyl-terminated polydimethylsiloxane. The plant-derived dispersant is a mixture of tea saponin and gum arabic in a mass ratio of 2:1. The ethanol has a purity of 98%. The crosslinking agent is an isocyanate crosslinking agent.

[0022] A method for preparing a stain-resistant coating for fabrics, comprising the following steps: S1: Pretreatment of hollow mesoporous silica microspheres: Hollow mesoporous silica microspheres are added to deionized water, with the hollow mesoporous silica microspheres accounting for 1 / 3 of the total deionized water volume. 0.5 parts of polyglycerol ricinoleate are added, and the mixture is stirred at 250 r / min for 10 minutes to form a stable dispersion for later use. S2: Preparation of modified nano-silica: Nano-silica was added to a solvent of ethanol and deionized water at a mass ratio of 3:1 and ultrasonically dispersed for 20 minutes at a frequency of 25 kHz to obtain a nano-silica dispersion. KH-550 silane coupling agent was added to the dispersion and stirred at 65°C for 2.5 hours. Then, fluoroalkyl phosphate was added, and the temperature was raised to 80°C and stirred for another 2 hours. After the reaction was completed, the mixture was centrifuged at 9000 r / min for 12 minutes. The precipitate was washed three times with ethanol and dried at 85°C for 2.5 hours to obtain modified nano-silica. S3: Mix the basic components. Add the aqueous polyurethane emulsion to the reactor and stir at 350 r / min. Add the plant-derived dispersant and the remaining polyglycerol ricinoleate in sequence, with a mass ratio of 1:2.5, and stir for 10 minutes. Then add the silicone resin and fluorinated polyether modified acrylate, heat to 55℃ and stir for 15 minutes. Subsequently, add the modified nano silica and the hollow mesoporous silica dispersion prepared in S1, reduce the speed to 475 r / min and stir for 28 minutes to form a mixture. S4: Adjustment and crosslinking. Add ethanol to the mixture obtained in S3 and stir for 12 minutes at 450 r / min to adjust the viscosity of the mixture to 250 mPa·s. Then add the crosslinking agent, control the temperature inside the reactor to 45℃, and continue stirring for 30 minutes. After stirring, let it stand at room temperature for 1.5 hours to remove bubbles and obtain the antifouling coating for fabric. Example

[0023] refer to Figure 1 This invention relates to a stain-resistant coating for fabrics, comprising the following components (by mass): 28 parts modified nano-silica, 50 parts waterborne polyurethane emulsion, 15 parts organosilicon resin, 8 parts plant-derived dispersant, 15 parts ethanol, 20 parts deionized water, 4.5 parts crosslinking agent, 12 parts fluorinated polyether modified acrylate, 10 parts hollow mesoporous silica microspheres, and 5 parts polyglycerol ricinoleate.

[0024] Specifically, the fluorinated polyether modified acrylate has a number average molecular weight of 2000-3000, a fluorine content of 28%, and contains fluorinated polyether segments and acrylate double bonds. The hollow mesoporous silica microspheres and modified nano-silica are graded by 200-300nm hollow particles and 50-100nm solid particles. The hollow mesoporous silica microspheres have a particle size of 200-300nm, a hollowness of 40-50%, and a mesopore size of 2-5nm. The polyglycerol ricinoleate has a hydrophilic-lipophilic balance value of 9 and is obtained by esterification reaction of castor oil and polyglycerol. The molecule contains polyhydroxyl groups and long-chain fatty acid ester groups. The organosilicon is hydroxyl-terminated polydimethylsiloxane. The plant-derived dispersant is a mixture of tea saponin and gum arabic in a mass ratio of 2:1. The ethanol has a purity of 98%. The crosslinking agent is an isocyanate crosslinking agent.

[0025] A method for preparing a stain-resistant coating for fabrics, comprising the following steps: S1: Pretreatment of hollow mesoporous silica microspheres: Hollow mesoporous silica microspheres are added to deionized water, with the hollow mesoporous silica microspheres accounting for 1 / 3 of the total deionized water volume. 0.5 parts of polyglycerol ricinoleate are added, and the mixture is stirred at 250 r / min for 10 minutes to form a stable dispersion for later use. S2: Preparation of modified nano-silica: Nano-silica was added to a solvent of ethanol and deionized water at a mass ratio of 3:1 and ultrasonically dispersed for 20 minutes at a frequency of 25 kHz to obtain a nano-silica dispersion. KH-550 silane coupling agent was added to the dispersion and stirred at 65°C for 2.5 hours. Then, fluoroalkyl phosphate was added, and the temperature was raised to 80°C and stirred for another 2 hours. After the reaction was completed, the mixture was centrifuged at 9000 r / min for 12 minutes. The precipitate was washed three times with ethanol and dried at 85°C for 2.5 hours to obtain modified nano-silica. S3: Mix the basic components. Add the aqueous polyurethane emulsion to the reactor and stir at 350 r / min. Add the plant-derived dispersant and the remaining polyglycerol ricinoleate in sequence, with a mass ratio of 1:2.5, and stir for 10 minutes. Then add the silicone resin and fluorinated polyether modified acrylate, heat to 55℃ and stir for 15 minutes. Subsequently, add the modified nano silica and the hollow mesoporous silica dispersion prepared in S1, reduce the speed to 475 r / min and stir for 28 minutes to form a mixture. S4: Adjustment and crosslinking. Add ethanol to the mixture obtained in S3 and stir for 12 minutes at 450 r / min to adjust the viscosity of the mixture to 250 mPa·s. Then add the crosslinking agent, control the temperature inside the reactor to 45℃, and continue stirring for 30 minutes. After stirring, let it stand at room temperature for 1.5 hours to remove bubbles and obtain the antifouling coating for fabric.

[0026] Fabric modification: Select cotton-polyester blended fabric, preheat the fabric at 70℃ for 15 minutes to remove moisture and impurities; use 5% sodium hydroxide solution, boil at 80℃ for 25 minutes, wash with deionized water until neutral and dry to remove wax and pectin from the fabric surface, increase fiber hydroxyl groups and improve coating adhesion. The modified fabric was coated using a pad-on method with a padding pressure of 0.2 MPa and a roll-off rate of 65%. After coating, it was pre-baked at 80°C for 6 minutes, cured at 120°C for 10 minutes, and then naturally cooled to room temperature to obtain the modified antifouling fabric.

[0027] The antifouling coating of Example 1 has an oil contact angle of 130° and an air permeability of 1150 mm / s; The antifouling coating of Example 2 has an oil contact angle of 145° and an air permeability of 1320 mm / s; The antifouling coating of Example 3 has an oil contact angle of 136° and an air permeability of 1250 mm / s; In summary, this antifouling coating has both excellent antifouling performance and good breathability, and the component ratio of Example 2 is good.

[0028] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A stain-resistant coating for fabrics, characterized in that, It includes the following components (by mass): 18-28 parts modified nano silica, 25-50 parts waterborne polyurethane emulsion, 8-15 parts organosilicon resin, 3-8 parts plant-derived dispersant, 10-15 parts ethanol, 15-20 parts deionized water, 1.5-4.5 parts crosslinking agent, 7-12 parts fluorinated polyether modified acrylate, 4-10 parts hollow mesoporous silica microspheres, and 1-5 parts polyglycerol ricinoleate.

2. The anti-fouling coating for fabrics according to claim 1, characterized in that, The modified nano-silica is prepared by modifying nano-silica with KH-550 silane coupling agent and fluoroalkyl phosphate. The amount of KH-550 silane coupling agent is 5-8% of the mass of nano-silica, the amount of fluoroalkyl phosphate is 3-6% of the mass of nano-silica, and the particle size of nano-silica is 50-100 nm.

3. The anti-fouling coating for fabrics according to claim 1, characterized in that, The fluorinated polyether modified acrylate has a number average molecular weight of 2000-3000, a fluorine content of 25-30%, and the molecule contains fluorinated polyether segments and acrylate double bonds.

4. The anti-fouling coating for fabrics according to claim 1, characterized in that, The hollow mesoporous silica microspheres and modified nano-silica are graded by 200-300nm hollow particles and 50-100nm solid particles. The hollow mesoporous silica microspheres have a particle size of 200-300nm, a hollowness of 40-50%, and a mesopore size of 2-5nm.

5. The anti-fouling coating for fabrics according to claim 1, characterized in that: The polyglycerol ricinoleate has a hydrophilic-lipophilic balance value of 8-10, and is prepared by esterification of castor oil with polyglycerol. The molecule contains polyhydroxyl groups and long-chain fatty acid ester groups.

6. The anti-fouling coating for fabrics according to claim 1, characterized in that, The organosilicon grease is hydroxyl-terminated polydimethylsiloxane, the plant-derived dispersant is a mixture of tea saponin and gum arabic in a mass ratio of 2:1, the ethanol has a purity of 95% or higher, and the crosslinking agent is an isocyanate crosslinking agent.

7. A method for preparing a stain-resistant coating for fabrics, used to prepare the stain-resistant coating for fabrics according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Pretreatment of hollow mesoporous silica microspheres: Add hollow mesoporous silica microspheres to deionized water, add 0.5-1 part of polyglycerol ricinoleate, stir at 200-300 r / min for 10 minutes to form a stable dispersion for later use; S2: To prepare modified nano-silica, nano-silica was added to a solvent of ethanol and deionized water and ultrasonically dispersed for 15-25 minutes at a frequency of 20-30 kHz to obtain a nano-silica dispersion. KH-550 silane coupling agent was added to the dispersion and stirred at 60-70℃ for 2-3 hours. Then, fluoroalkyl phosphate was added, and the temperature was raised to 75-85℃ and the reaction was continued with stirring for 1.5-2.5 hours. After the reaction was completed, the mixture was centrifuged at 8000-10000 r / min for 10-15 minutes. The precipitate was washed with ethanol 3-4 times and dried at 80-90℃ for 2-3 hours to obtain modified nano-silica. S3: Mix the basic components. Add the aqueous polyurethane emulsion to the reactor and stir at 300-400 r / min. Add the plant-derived dispersant and the remaining polyglycerol ricinoleate in sequence, with a mass ratio of 1:2-3, and stir for 10 minutes. Then add the silicone resin and fluorinated polyether modified acrylate, heat to 50-55℃ and stir for 15 minutes. Subsequently, add the modified nano silica and the hollow mesoporous silica dispersion prepared in S1, reduce the speed to 450-500 r / min, and stir for 25-30 minutes to form a mixture. S4: Adjustment and crosslinking. Add ethanol to the mixture obtained in S3 and stir at 400-500 r / min for 10-15 minutes to adjust the viscosity of the mixture to 200-300 mPa·s. Then add the crosslinking agent, control the temperature inside the reactor to 40-50℃, and continue stirring for 25-35 minutes. After stirring, let it stand at room temperature for 1-2 hours to remove bubbles and obtain the antifouling coating for fabrics.

8. The anti-fouling coating for fabrics and its preparation method according to claim 7, characterized in that, In step S1, the hollow mesoporous silica microspheres account for 1 / 3 of the total deionized water volume, and in step S2, nano-silica and deionized water are mixed at a mass ratio of 3:1.

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