Waterproof, oil-proof and anti-fouling fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and discloses a waterproof, oil-proof and anti-fouling fabric and a preparation method thereof. The fabric is prepared from the following raw materials in parts by weight: 40 to 65 parts of nylon fibers, 15 to 30 parts of polyhydroxyalkanoate fibers, 10 to 23 parts of modified nylon fibers, 3 to 8 parts of composite particles and 2 to 6 parts of composite powder; the garment body is made of a fabric, the fabric is formed by weaving warp yarns and weft yarns, the warp yarns are formed by blending and twisting nylon fibers and modified nylon fibers, and the weft yarns are formed by blending and spinning nylon fibers, polyhydroxyalkanoate fibers and composite particles; the composite powder is attached to the surface of the fabric through a finishing liquid, and titanium dioxide in the composite particles is uniformly distributed on the surfaces and the interiors of warp and weft yarns through yarn blended spinning to form a compact water film so as to realize oil-proof and anti-pollution functions. The fabric has excellent waterproof, oil-proof and anti-fouling performance and antibacterial effect, high tensile strength and stable and durable performance, and the problems that an existing fabric is single in function and easy to attenuate in performance are solved.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a waterproof, oil-resistant, and stain-resistant fabric and its preparation method. Background Technology

[0002] As people's living standards improve, the functional requirements for fabrics are increasing. Waterproofing, oil-proofing, and stain resistance have become important performance indicators for many fabrics. Currently, the common method to achieve waterproof, oil-proof, and stain-resistant properties in fabrics is through finishing processes, where finishing agents such as fluorinated compounds are attached to the fabric surface, utilizing their low surface energy characteristics to achieve water and oil repellency.

[0003] However, existing technologies have many shortcomings.

[0004] On the one hand, the bonding force between the finishing agent and the fabric fibers is weak, and it is easy to fall off after repeated washing, resulting in poor functional durability; On the other hand, the use of some finishing agents can affect the feel and breathability of the fabric, reducing wearing comfort.

[0005] In addition, the existing fabrics have relatively limited functionality, and while they are waterproof, oil-proof and stain-resistant, they are difficult to combine with other excellent properties such as antibacterial and environmental protection.

[0006] Therefore, a fabric with excellent waterproof, oil-proof, and stain-resistant properties, long-lasting function, good hand feel, and other beneficial properties, as well as its preparation method, are proposed. Summary of the Invention

[0007] The present invention aims to provide a waterproof, oil-repellent and stain-resistant fabric and its preparation method, in order to solve the problems of poor functional durability, affected hand feel and breathability, and limited functionality of existing waterproof, oil-repellent and stain-resistant fabrics.

[0008] To achieve the above objectives, the present invention provides the following technical solution: The technical solution provided by this invention is: A waterproof, oil-proof, and stain-resistant fabric, comprising the following raw materials in parts by weight: 40-65 parts nylon fiber, 15-30 parts polyhydroxyalkanoate fiber, 10-23 parts modified nylon fiber, 3-8 parts composite particles, and 2-6 parts composite powder. The fabric is woven from warp and weft yarns, wherein the warp yarns are made by blending and twisting nylon fibers and modified nylon fibers, and the weft yarns are made by blending and spinning nylon fibers, polyhydroxyalkanoate fibers and composite particles. The composite powder is attached to the fabric surface by the finishing liquid, and the titanium dioxide in the composite particles is evenly distributed on the surface and inside of the warp and weft yarns through yarn blending and spinning to form a dense water film to achieve oil and stain resistance.

[0009] Furthermore, the preparation process of the modified nylon fiber is as follows: nylon fiber is immersed in a chitosan aqueous solution with a mass concentration of 2%-5%, stirred at 200-300 rpm for 1.5-3 hours at 45-60℃, then taken out and dried at 90-100℃ to constant weight, and obtained after cooling.

[0010] Furthermore, the preparation process of the composite particles is as follows: Step A: Add montmorillonite to a 10%-15% hydrochloric acid aqueous solution, with a mass ratio of montmorillonite to hydrochloric acid aqueous solution of 1:8-12. Stir and activate at 60-70℃ and 300-500 rpm for 2-3 hours, then filter to obtain filter residue. Step B: Rinse the filter residue obtained in Step A repeatedly with deionized water until the pH of the aqueous solution after rinsing is 6.8-7.2. Then place the rinsed filter residue in an oven at 105-115℃ and dry it for 4-6 hours to obtain activated montmorillonite. Step C: Dissolve tetrabutyl titanate in anhydrous ethanol at a volume ratio of 1:3-5, and stir until completely dissolved to obtain a titanium alcohol solution. Step D: Add the activated montmorillonite obtained in step B and a nitric acid aqueous solution with a mass concentration of 5%-8% to the titanium alcohol solution obtained in step C. The mass ratio of activated montmorillonite to tetrabutyl titanate is 1:2-4, and the volume ratio of nitric acid aqueous solution to titanium alcohol solution is 1:10-15. Stir the reaction at 200-300 rpm for 4-6 hours at 50-60℃ to obtain the reaction solution. Step E: Place the reaction solution obtained in step D into a centrifuge and centrifuge at 3000-4000 rpm for 15-25 min to obtain a precipitate; Step F: Wash the precipitate obtained in step E with anhydrous ethanol 3-5 times, then place the washed precipitate in a muffle furnace and calcine it at 500-600℃ for 2-3 hours. After calcination, allow it to cool naturally to room temperature to obtain composite particles.

[0011] Furthermore, the preparation process of the composite powder is as follows: Step a: Dissolve calcium nitrate in deionized water to prepare a calcium nitrate solution with a mass concentration of 8%-12%; dissolve diammonium hydrogen phosphate in deionized water to prepare a diammonium hydrogen phosphate solution with a mass concentration of 5%-8%. Step b: Add chitosan to an aqueous acetic acid solution with a mass concentration of 1%-2% and stir at 40-50℃ until completely dissolved to obtain a chitosan acetic acid solution; Step c: Slowly add calcium nitrate solution dropwise to diammonium hydrogen phosphate solution while stirring, adjust the pH value to 9.0-10.0, and react at 60-70℃ for 2-3 hours to obtain hydroxyapatite suspension; Step d: Add the chitosan acetate solution to the hydroxyapatite suspension, with a mass ratio of chitosan to hydroxyapatite of 1:4-6. Stir the mixture at 50-60℃ for 1.5-2.5 hours to obtain the composite suspension. Step e: Centrifuge the composite suspension to obtain a precipitate, wash the precipitate with deionized water until neutral, then dry it at 80-90℃, pulverize it and pass it through a 200-300 mesh sieve to obtain the composite powder.

[0012] A method for preparing a waterproof, oil-repellent, and stain-resistant fabric includes the following steps: S1: Preparation of warp yarn: Mix nylon fiber and modified nylon fiber according to the weight ratio, and process them with a twisting process of 9-14 twists / cm to make warp yarn; S2: Preparation of weft yarn: Take nylon fiber, polyhydroxyalkanoate fiber and composite particles containing titanium dioxide according to the weight parts, put them into a high-speed mixer. The agitator of the high-speed mixer is a ribbon agitator. Mix at 80-100℃ and 1500-2000 rpm for 20-40 minutes. Then add the mixture to a composite spinning machine and spin it at a spinning temperature of 180-220℃ and a spinning speed of 900-1300 m / min to make weft yarn. S3: Weaving the base fabric: The warp yarns made in S1 and the weft yarns made in S2 are placed on a rapier loom and woven at a weaving speed of 220-320 rpm, with a warp density of 380-450 ends / 10 cm and a weft density of 320-380 ends / 10 cm to obtain the base fabric; S4: Base fabric pretreatment: The base fabric obtained in S3 is placed in an aqueous solution containing 0.5%-1.2% citric acid by mass, with a bath ratio of 1:15-20 between the base fabric and the aqueous solution of citric acid. It is soaked at 50-65℃ for 1.5-2.5 hours, then rinsed with deionized water until neutral, and pre-dried at 85-95℃ for 15-25 minutes. S5: Dye liquor treatment: Immerse the pretreated base fabric in the dye liquor. The ratio of base fabric to dye liquor is 1:20-25. The dye liquor contains, by weight, 5-16 parts disperse dye, 7-13 parts urea, 0.9-1.7 parts fatty alcohol polyoxyethylene ether, 12-20 parts sodium sulfate, 1.8-3.2 parts hexadecyltrimethylammonium bromide, 1.5-2.6 parts sodium bicarbonate, and 3.5-7.5 parts sodium naphthalenesulfonate formaldehyde condensate. The processing procedure is as follows: starting from 32-36℃, the temperature is increased to 72-76℃ at a rate of 1.8-2.4℃ / min and held for 10-14 min; then the temperature is increased to 98-112℃ at a rate of 0.9-1.1℃ / min and held for 6-10 min; next, the temperature is increased to 122-128℃ at a rate of 0.9-1.1℃ / min and held for 28-36 min; after that, the base fabric is taken out and washed with deionized water at 40-50℃ 2-3 times, 10-15 min each time, and then dried at 95-105℃. S6: Finishing solution treatment: Take 7-13 parts by weight of perfluorohexyl ethyl acrylate copolymer, 55-75 parts of anhydrous ethanol, 2.5-4.5 parts of nano zinc oxide, 0.3-0.8 parts of polyhexamethylene biguanide hydrochloride, 2-6 parts of composite powder, and 85-92 parts of deionized water. Preparation of finishing solution: First, dissolve perfluorohexyl ethyl acrylate copolymer in anhydrous ethanol and stir at 500-700 rpm for 15-25 min at 30-40℃ until completely dissolved. Then add nano zinc oxide, polyhexamethylene biguanide hydrochloride, composite powder and deionized water, and continue stirring at 800-1000 rpm for 30-40 min to obtain finishing solution. The dried base fabric is immersed in the finishing solution for 35-55 minutes, with a base fabric to finishing solution bath ratio of 1:18-22; subsequently, the base fabric undergoes a two-dip and two-padding treatment, with a padding temperature of 28-33℃, a finishing solution concentration of 25-40 g / L in the padding tank, a padding pressure of 1.9-2.2 MPa, and a liquid retention rate of 68-73%. S7: Setting treatment: The impregnated base fabric is first pre-dried at a temperature of 102-108℃ for 18-22 minutes, and then set at a temperature of 165-172℃ for 25-32 seconds. The setting machine speed is 19-21m / min, resulting in a waterproof, oil-proof and stain-resistant fabric.

[0013] The beneficial effects of this technical solution are: (1) This technical solution uses nylon fiber and modified nylon fiber as the core base material to achieve a balance between performance and environmental protection. Nylon fiber has excellent tensile and abrasion resistance properties. The warp yarn can be used to build a stable support by adjusting the ratio of the two nylon components without relying on other fibers. After being treated with chitosan, the modified nylon has an increased density of surface active groups, which can form hydrogen bonds with polyhydroxyalkanoate fibers to strengthen the binding force between components. It can also lay the foundation for antibacterial effect with the natural antibacterial properties of chitosan. As a bio-based fiber, polyhydroxyalkanoate forms a durable and environmentally friendly synergy with nylon. It retains the wear resistance advantage and reduces the environmental burden through degradability. The gentle surface can also reduce skin irritation.

[0014] (2) In the montmorillonite-titanium dioxide composite particles, the layered structure of montmorillonite provides a carrier for titanium dioxide, preventing its aggregation. The hydrophilic film formed after the hydrolysis of titanium dioxide can physically block oil stains. The composite powder is composed of hydroxyapatite and chitosan. The porous structure of hydroxyapatite can adsorb residual stains, while chitosan further enhances antibacterial and adhesion properties. These functional components have excellent compatibility with the substrate, fundamentally solving the problem of easy shedding of functional components in traditional fabrics.

[0015] (3) The chitosan in the modified nylon, the titanium dioxide in the composite particles, and the polyhexamethylene biguanide hydrochloride in the finishing solution form a triple antibacterial system, covering different antibacterial mechanisms. The inherent strength of nylon and the skeletal support of the composite particles combine to ensure the mechanical stability of the fabric. All components are combined without performance conflicts, which not only gives full play to the durability advantage of nylon, but also achieves the unity of multiple functions such as waterproof, oil-proof, antibacterial, and environmental protection by means of bio-based fibers and functional powders. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the preparation process of a waterproof, oil-proof, and stain-resistant fabric and its preparation method proposed in this invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The specific implementation process is as follows: Example 1: Please see Figure 1 The present invention provides a technical solution: a waterproof, oil-proof, and stain-resistant fabric and its preparation method, comprising the following steps: To prepare modified nylon fibers, 100g of nylon fibers were immersed in a 2% (w / w) chitosan aqueous solution and stirred at 200 rpm for 1.5 h at 45 °C. The fibers were then removed, dried at 90 °C to constant weight, and cooled to obtain modified nylon fibers.

[0019] Preparation of composite particles Step A: Add 10g of montmorillonite to 80g of 10% hydrochloric acid aqueous solution, stir and activate at 300 rpm for 2 hours at 60℃, then filter to obtain filter residue; Step B: Rinse the filter residue repeatedly with deionized water until the pH of the aqueous solution after rinsing is 6.8. Then dry the filter residue in an oven at 105℃ for 4 hours to obtain activated montmorillonite. Step C: Dissolve 10 mL of tetrabutyl titanate in 30 mL of anhydrous ethanol and stir until completely dissolved to obtain a titanium alcohol solution; Step D: Add 5g of activated montmorillonite and 3mL of 5% nitric acid aqueous solution to the titanium alcohol solution, and stir the mixture at 200 rpm for 4 hours at 50℃ to obtain the reaction solution; Step E: Place the reaction solution in a centrifuge and centrifuge at 3000 rpm for 15 min to obtain a precipitate; Step F: Wash the precipitate three times with anhydrous ethanol, then place the precipitate in a muffle furnace and calcine at 500℃ for 2 h. After calcination, allow it to cool naturally to room temperature to obtain composite particles.

[0020] Preparation of composite powder Step a: Dissolve 8g of calcium nitrate in 92g of deionized water to prepare an 8% calcium nitrate solution; dissolve 5g of diammonium hydrogen phosphate in 95g of deionized water to prepare a 5% diammonium hydrogen phosphate solution. Step b: Add 10g of chitosan to 990g of 1% acetic acid aqueous solution and stir at 40℃ until completely dissolved to obtain chitosan acetic acid solution; Step c: Slowly add calcium nitrate solution dropwise to diammonium hydrogen phosphate solution while stirring, adjust the pH value to 9.0, and react at 60℃ for 2 hours to obtain hydroxyapatite suspension; Step d: Add chitosan acetate solution to hydroxyapatite suspension, with a chitosan to hydroxyapatite mass ratio of 1:4, and stir at 50°C for 1.5 h to obtain composite suspension; Step e: Centrifuge the composite suspension to obtain a precipitate, wash the precipitate with deionized water until neutral, then dry it at 80°C, pulverize it and pass it through a 200-mesh sieve to obtain the composite powder.

[0021] Fabric preparation S1: Preparation of warp yarn: Take 38g of nylon fiber and 36g of modified nylon fiber, mix them, and process them with a twisting process of 11 twists / cm to make warp yarn.

[0022] S2: Preparation of weft yarn: Take 22g of polyhydroxyalkanoate fiber, 33g of modified nylon fiber, and 5g of composite particles containing titanium dioxide, put them into a high-speed mixer. The high-speed mixer has a ribbon-type agitator. Mix at 90℃ and 1750 rpm for 30 minutes. Then add the mixture to a composite spinning machine and spin it at a spinning temperature of 200℃ and a spinning speed of 1100 m / min to make weft yarn.

[0023] S3: Weaving the base fabric: Place the warp and weft yarns on a rapier loom and weave at a weaving speed of 270 rpm, a warp density of 410 ends / 10 cm, and a weft density of 350 ends / 10 cm to obtain the base fabric.

[0024] S4: Base fabric pretreatment: The base fabric is placed in a 0.8% citric acid aqueous solution with a bath ratio of 1:17 and soaked at 57°C for 2 hours. Then it is rinsed with deionized water until neutral and pre-dried at 90°C for 20 minutes.

[0025] S5: Dye liquor treatment: Immerse the pretreated base fabric in the dye liquor with a base fabric to dye liquor ratio of 1:22. The dye liquor contains 10g disperse dye, 10g urea, 1.3g fatty alcohol polyoxyethylene ether, 16g sodium sulfate, 2.5g hexadecyltrimethylammonium bromide, 2g sodium bicarbonate, and 5.5g sodium naphthalenesulfonate formaldehyde condensate. The treatment process is as follows: start at 34℃, heat to 74℃ at a rate of 2.1℃ / min and hold for 12min, then heat to 105℃ at a rate of 1℃ / min and hold for 8min, then heat to 125℃ at a rate of 1℃ / min and hold for 32min. After that, take out the base fabric and wash it twice with 45℃ deionized water for 12min each time, and then dry it at 100℃.

[0026] S6: Finishing Solution Treatment: Prepare a finishing solution by taking 10g of perfluorohexyl ethyl acrylate copolymer, 65g of anhydrous ethanol, 3.5g of nano zinc oxide, 0.5g of polyhexamethylene biguanide hydrochloride, 4g of composite powder, and 88g of deionized water; first, dissolve the perfluorohexyl ethyl acrylate copolymer in anhydrous ethanol and stir at 600 rpm for 20 minutes at 35℃ until completely dissolved, then add nano zinc oxide, polyhexamethylene biguanide hydrochloride, composite powder, and deionized water, and continue stirring at 900 rpm for 35 minutes to obtain the finishing solution; immerse the dried base fabric in the finishing solution for 45 minutes, with a base fabric to finishing solution bath ratio of 1:20; then perform a two-dip two-nip treatment on the base fabric, with a nip temperature of 30℃, a finishing solution concentration of 32g / L in the nip groove, a nip pressure of 2.0MPa, and a liquid carry-over rate of 70%.

[0027] S7: Setting treatment: The impregnated base fabric is first pre-dried at 105℃ for 20 minutes, and then set at 168℃ for 28 seconds. The setting machine speed is 20m / min to obtain a waterproof, oil-proof and stain-resistant fabric.

[0028] Performance indicators Test Results Waterproof (water-repellent rating) Level 3 Oil-resistant (oil-repellent rating) Level 4 Stain resistance (stain tolerance level) Level 4 Antibacterial (bacteriostatic rate) 85% Tensile strength 280N The fabric prepared in Example 1 achieved a waterproof rating of 3, indicating that it can effectively block the penetration of small amounts of water droplets; its oil resistance rating was 4, which can resist the adhesion of most common oil stains; its stain resistance rating was 4, meaning that stains are not easy to leave on the fabric surface and are easy to clean; in terms of antibacterial properties, the antibacterial rate reached 85%, which can inhibit the growth of most common bacteria; and its tensile strength was 280N, indicating that the fabric has a certain mechanical stability and can meet the tensile requirements in daily use. All performance indicators reflect the basic waterproof, oil-proof, stain-resistant and additional functions, meeting the basic usage requirements of the fabric.

[0029] Example 2: Please see Figure 1 The present invention provides a technical solution: a waterproof, oil-proof, and stain-resistant fabric and its preparation method, comprising the following steps: To prepare modified nylon fibers, 100g of nylon fibers were soaked in a 3% (w / w) chitosan aqueous solution and stirred at 250 rpm for 2 hours at 50°C. The fibers were then removed, dried at 95°C to constant weight, and cooled to obtain modified nylon fibers.

[0030] Preparation of composite particles Step A: Take 10g of montmorillonite and add it to 100g of 12% hydrochloric acid aqueous solution. Stir and activate it at 65℃ and 400 rpm for 2.5h. Then filter it to obtain filter residue. Step B: Rinse the filter residue repeatedly with deionized water until the pH of the aqueous solution after rinsing is 7.0. Then place the filter residue in an oven at 110℃ and dry for 5 hours to obtain activated montmorillonite. Step C: Dissolve 10 mL of tetrabutyl titanate in 40 mL of anhydrous ethanol and stir until completely dissolved to obtain a titanium alcohol solution; Step D: Add 3.3g of activated montmorillonite and 0.8mL of 6% nitric acid aqueous solution to the titanium alcohol solution, and stir the mixture at 250 rpm for 5h at 55℃ to obtain the reaction solution; Step E: Place the reaction solution in a centrifuge and centrifuge at 3500 rpm for 20 min to obtain a precipitate; Step F: Wash the precipitate 4 times with anhydrous ethanol, then place the precipitate in a muffle furnace and calcine at 550℃ for 2.5 h. After calcination, allow it to cool naturally to room temperature to obtain composite particles.

[0031] Preparation of composite powder Step a: Dissolve 10g of calcium nitrate in 90g of deionized water to prepare a 10% calcium nitrate solution; dissolve 6.5g of diammonium hydrogen phosphate in 93.5g of deionized water to prepare a 6.5% diammonium hydrogen phosphate solution. Step b: Add 10g of chitosan to 656.7g of 1.5% acetic acid aqueous solution and stir at 45℃ until completely dissolved to obtain chitosan acetic acid solution; Step c: Slowly add calcium nitrate solution dropwise to diammonium hydrogen phosphate solution while stirring, adjust the pH value to 9.5, and react at 65℃ for 2.5 h to obtain hydroxyapatite suspension; Step d: Add chitosan acetate solution to hydroxyapatite suspension, with a chitosan to hydroxyapatite mass ratio of 1:5, and stir at 55℃ for 2 hours to obtain composite suspension; Step e: Centrifuge the composite suspension to obtain a precipitate, wash the precipitate with deionized water until neutral, then dry it at 85°C, pulverize it and pass it through a 250-mesh sieve to obtain the composite powder.

[0032] Fabric preparation S1: Preparation of warp yarn: Take 38g of nylon fiber and 36g of modified nylon fiber, mix them, and process them with a twisting process of 11 twists / cm to make warp yarn.

[0033] S2: Preparation of weft yarn: Take 22g of polyhydroxyalkanoate fiber, 33g of modified nylon fiber, and 5g of composite particles containing titanium dioxide, put them into a high-speed mixer. The high-speed mixer has a ribbon-type agitator. Mix at 90℃ and 1750 rpm for 30 minutes. Then add the mixture to a composite spinning machine and spin it at a spinning temperature of 200℃ and a spinning speed of 1100 m / min to make weft yarn.

[0034] S3: Weaving the base fabric: Place the warp and weft yarns on a rapier loom and weave at a weaving speed of 270 rpm, a warp density of 410 ends / 10 cm, and a weft density of 350 ends / 10 cm to obtain the base fabric.

[0035] S4: Base fabric pretreatment: The base fabric is placed in a 0.8% citric acid aqueous solution with a bath ratio of 1:17 and soaked at 57°C for 2 hours. Then it is rinsed with deionized water until neutral and pre-dried at 90°C for 20 minutes.

[0036] S5: Dye liquor treatment: Immerse the pretreated base fabric in the dye liquor with a base fabric to dye liquor ratio of 1:22. The dye liquor contains 10g disperse dye, 10g urea, 1.3g fatty alcohol polyoxyethylene ether, 16g sodium sulfate, 2.5g hexadecyltrimethylammonium bromide, 2g sodium bicarbonate, and 5.5g sodium naphthalenesulfonate formaldehyde condensate. The treatment process is as follows: start at 34℃, heat to 74℃ at a rate of 2.1℃ / min and hold for 12min, then heat to 105℃ at a rate of 1℃ / min and hold for 8min, then heat to 125℃ at a rate of 1℃ / min and hold for 32min. After that, take out the base fabric and wash it twice with 45℃ deionized water for 12min each time, and then dry it at 100℃.

[0037] S6: Finishing Solution Treatment: Prepare a finishing solution by taking 10g of perfluorohexyl ethyl acrylate copolymer, 65g of anhydrous ethanol, 3.5g of nano zinc oxide, 0.5g of polyhexamethylene biguanide hydrochloride, 4g of composite powder, and 88g of deionized water; first, dissolve the perfluorohexyl ethyl acrylate copolymer in anhydrous ethanol and stir at 600 rpm for 20 minutes at 35℃ until completely dissolved, then add nano zinc oxide, polyhexamethylene biguanide hydrochloride, composite powder, and deionized water, and continue stirring at 900 rpm for 35 minutes to obtain the finishing solution; immerse the dried base fabric in the finishing solution for 45 minutes, with a base fabric to finishing solution bath ratio of 1:20; then perform a two-dip two-nip treatment on the base fabric, with a nip temperature of 30℃, a finishing solution concentration of 32g / L in the nip groove, a nip pressure of 2.0MPa, and a liquid carry-over rate of 70%.

[0038] S7: Setting treatment: The impregnated base fabric is first pre-dried at 105℃ for 20 minutes, and then set at 168℃ for 28 seconds. The setting machine speed is 20m / min to obtain a waterproof, oil-proof and stain-resistant fabric.

[0039] Performance indicators Test Results Waterproof (water-repellent rating) Level 4 Oil-resistant (oil-repellent rating) Level 5 Stain resistance (stain tolerance level) Level 5 Antibacterial (bacteriostatic rate) 92% Tensile strength 350N The fabric performance of Example 2 is significantly improved compared to Example 1. The waterproof performance reaches level 4, which can effectively block the impact of moderate-intensity water droplets without penetration; the oil resistance performance is level 5, which can resist various oil stains and the oil stains are not easy to adhere; the stain resistance performance is level 5, and the stains on the fabric surface are very easy to clean without leaving any residue; in terms of antibacterial performance, the antibacterial rate is increased to 92%, and the inhibitory effect on common bacteria is significantly enhanced; the tensile strength is 350N, and the mechanical stability of the fabric is further improved, which can withstand greater tensile force without being easily damaged.

[0040] Example 3: Please see Figure 1 The present invention provides a technical solution: a waterproof, oil-proof, and stain-resistant fabric and its preparation method, comprising the following steps: To prepare modified nylon fibers, 100g of nylon fibers were immersed in a 4% (w / w) chitosan aqueous solution and stirred at 280 rpm for 2.5 h at 55 °C. The fibers were then removed, dried at 98 °C to constant weight, and cooled to obtain modified nylon fibers.

[0041] Preparation of composite particles Step A: Take 10g of montmorillonite and add it to 110g of 14% hydrochloric acid aqueous solution. Stir and activate it at 68℃ and 450 rpm for 2.8h. Then filter it to obtain filter residue. Step B: Rinse the filter residue repeatedly with deionized water until the pH of the aqueous solution after rinsing is 7.1. Then place the filter residue in an oven at 112℃ and dry for 5.5 hours to obtain activated montmorillonite. Step C: Dissolve 10 mL of tetrabutyl titanate in 45 mL of anhydrous ethanol and stir until completely dissolved to obtain a titanium alcohol solution; Step D: Add 2.9g of activated montmorillonite and 0.7mL of 7% nitric acid aqueous solution to the titanium alcohol solution, and stir the mixture at 280 rpm for 5.5h at 58℃ to obtain the reaction solution; Step E: Place the reaction solution in a centrifuge and centrifuge at 3800 rpm for 22 min to obtain a precipitate; Step F: Wash the precipitate 5 times with anhydrous ethanol, then place the precipitate in a muffle furnace and calcine it at 580°C for 2.8 hours. After calcination, allow it to cool naturally to room temperature to obtain composite particles.

[0042] Preparation of composite powder Step a: Dissolve 11g of calcium nitrate in 89g of deionized water to prepare an 11% calcium nitrate solution; dissolve 7g of diammonium hydrogen phosphate in 93g of deionized water to prepare a 7% diammonium hydrogen phosphate solution. Step b: Add 10g of chitosan to 500g of 2% (w / w) acetic acid aqueous solution and stir at 48℃ until completely dissolved to obtain chitosan acetic acid solution; Step c: Slowly add calcium nitrate solution dropwise to diammonium hydrogen phosphate solution while stirring, adjust the pH value to 9.8, and react at 68℃ for 2.8 h to obtain hydroxyapatite suspension; Step d: Add chitosan acetate solution to hydroxyapatite suspension, with a chitosan to hydroxyapatite mass ratio of 1:5.5, and stir at 58℃ for 2.2 h to obtain composite suspension; Step e: Centrifuge the composite suspension to obtain a precipitate, wash the precipitate with deionized water until neutral, then dry it at 88°C, pulverize it and pass it through a 280-mesh sieve to obtain the composite powder.

[0043] Fabric preparation S1: Preparation of warp yarn: Take 42g of nylon fiber and 40g of modified nylon fiber, mix them, and process them with a twisting process of 13 twists / cm to make warp yarn.

[0044] S2: Preparation of weft yarn: Take 28g of polyhydroxyalkanoate fiber, 41g of modified nylon fiber, and 7g of composite particles containing titanium dioxide, put them into a high-speed mixer. The high-speed mixer has a ribbon-type agitator. Mix at 95℃ and 1900 rpm for 35 minutes. Then add the mixture to a composite spinning machine and spin it at a spinning temperature of 210℃ and a spinning speed of 1200 m / min to make weft yarn.

[0045] S3: Weaving the base fabric: Place the warp and weft yarns on a rapier loom and weave at a speed of 300 rpm, with a warp density of 430 ends / 10 cm and a weft density of 370 ends / 10 cm to obtain the base fabric.

[0046] S4: Base fabric pretreatment: The base fabric is placed in a 1.1% citric acid aqueous solution with a bath ratio of 1:19 and soaked at 62°C for 2.3 hours. Then it is rinsed with deionized water until neutral and pre-dried at 93°C for 23 minutes.

[0047] S5: Dye liquor treatment: Immerse the pretreated base fabric in the dye liquor at a ratio of 1:24. The dye liquor contains 14g disperse dye, 12g urea, 1.6g fatty alcohol polyoxyethylene ether, 19g sodium sulfate, 3g hexadecyltrimethylammonium bromide, 2.5g sodium bicarbonate, and 7g sodium naphthalenesulfonate formaldehyde condensate. The treatment process starts at 35℃, increases the temperature to 75℃ at a rate of 2.3℃ / min and holds for 13min, then increases the temperature to 110℃ at a rate of 1.05℃ / min and holds for 9min, followed by increasing the temperature to 127℃ at a rate of 1.05℃ / min and holding for 35min. After that, remove the base fabric and wash it three times with deionized water at 48℃ for 14min each time, and then dry it at 103℃.

[0048] S6: Finishing solution treatment: Prepare the finishing solution by taking 12g of perfluorohexyl ethyl acrylate copolymer, 72g of anhydrous ethanol, 4.2g of nano zinc oxide, 0.7g of polyhexamethylene biguanide hydrochloride, 5g of composite powder, and 90g of deionized water; first, dissolve the perfluorohexyl ethyl acrylate copolymer in anhydrous ethanol and stir at 650 rpm for 23 min at 38℃ until completely dissolved, then add nano zinc oxide, polyhexamethylene biguanide hydrochloride, composite powder, and deionized water, and continue stirring at 950 rpm for 38 min to obtain the finishing solution; immerse the dried base fabric in the finishing solution for 50 min, with a base fabric to finishing solution bath ratio of 1:21; then perform a two-dip two-nip treatment on the base fabric, with a nip temperature of 32℃, a finishing solution concentration of 38g / L in the nip groove, a nip pressure of 2.1MPa, and a liquid carry-over rate of 72%.

[0049] S7: Setting treatment: The impregnated base fabric is first pre-dried at 107℃ for 21 minutes, and then set at 170℃ for 30 seconds. The setting machine speed is 20.5m / min to obtain a waterproof, oil-proof and stain-resistant fabric.

[0050] Performance indicators Test Results Waterproof (water-repellent rating) Level 4 Oil-resistant (oil-repellent rating) Level 5 Stain resistance (stain tolerance level) Level 5 Antibacterial (bacteriostatic rate) 95% Tensile strength 390N The fabric performance of Example 3 is continuously optimized. The waterproof performance remains at level 4, and the waterproof effect is more durable when faced with continuous water droplet impact. The oil and stain resistance performance is stably maintained at level 5, which can effectively resist high-viscosity oil stains and leave no residue after washing. The antibacterial performance is further improved, with an antibacterial rate of 95%, which has a good inhibitory effect on a variety of pathogenic bacteria. The tensile strength is 390N, and the tensile strength of the fabric is significantly enhanced. It is more wear-resistant and less prone to deformation in daily use, and the stability and durability of each performance index are strengthened.

[0051] Example 4: Please see Figure 1 The present invention provides a technical solution: a waterproof, oil-proof, and stain-resistant fabric and its preparation method, comprising the following steps: To prepare modified nylon fibers, 100g of nylon fibers were soaked in a 5% (w / w) chitosan aqueous solution and stirred at 300 rpm for 3 hours at 60°C. The fibers were then removed, dried at 100°C to constant weight, and cooled to obtain the modified nylon fibers.

[0052] Preparation of composite particles Step A: Add 10g of montmorillonite to 120g of 15% hydrochloric acid aqueous solution, stir and activate at 70℃ and 500 rpm for 3h, then filter to obtain filter residue; Step B: Rinse the filter residue repeatedly with deionized water until the pH of the aqueous solution after rinsing is 7.2. Then place the filter residue in an oven at 115℃ and dry for 6 hours to obtain activated montmorillonite. Step C: Dissolve 10 mL of tetrabutyl titanate in 50 mL of anhydrous ethanol and stir until completely dissolved to obtain a titanium alcohol solution; Step D: Add 2.5g of activated montmorillonite and 0.7mL of 8% nitric acid aqueous solution to the titanium alcohol solution, and stir the mixture at 300 rpm for 6 hours at 60℃ to obtain the reaction solution; Step E: Place the reaction solution in a centrifuge and centrifuge at 4000 rpm for 25 min to obtain a precipitate; Step F: Wash the precipitate 5 times with anhydrous ethanol, then place the precipitate in a muffle furnace and calcine it at 600°C for 3 hours. After calcination, allow it to cool naturally to room temperature to obtain composite particles.

[0053] Preparation of composite powder Step a: Dissolve 12g of calcium nitrate in 88g of deionized water to prepare a 12% calcium nitrate solution; dissolve 8g of diammonium hydrogen phosphate in 92g of deionized water to prepare an 8% diammonium hydrogen phosphate solution. Step b: Add 10g of chitosan to 500g of 2% (w / w) acetic acid aqueous solution and stir at 50℃ until completely dissolved to obtain chitosan acetic acid solution; Step c: Slowly add calcium nitrate solution dropwise to diammonium hydrogen phosphate solution while stirring, adjust the pH value to 10.0, and react at 70℃ for 3 hours to obtain hydroxyapatite suspension; Step d: Add chitosan acetate solution to hydroxyapatite suspension, with a chitosan to hydroxyapatite mass ratio of 1:6, and stir at 60℃ for 2.5 h to obtain composite suspension; Step e: Centrifuge the composite suspension to obtain a precipitate, wash the precipitate with deionized water until neutral, then dry it at 90°C, pulverize it and pass it through a 300-mesh sieve to obtain the composite powder.

[0054] Fabric preparation S1: Preparation of warp yarn: Take 45g of nylon fiber and 42g of modified nylon fiber, mix them, and process them with a twisting process of 14 twists / cm to make warp yarn.

[0055] S2: Preparation of weft yarn: Take 30g of polyhydroxyalkanoate fiber, 45g of modified nylon fiber, and 8g of composite particles containing titanium dioxide, put them into a high-speed mixer. The high-speed mixer has a ribbon-type agitator. Mix at 100℃ and 2000 rpm for 40 minutes. Then add the mixture to a composite spinning machine and spin it at a spinning temperature of 220℃ and a spinning speed of 1300 m / min to make weft yarn.

[0056] S3: Weaving the base fabric: Place the warp and weft yarns on a rapier loom and weave at a speed of 320 rpm, a warp density of 450 ends / 10 cm, and a weft density of 380 ends / 10 cm to obtain the base fabric.

[0057] S4: Base fabric pretreatment: Place the base fabric in a 1.2% (w / w) citric acid aqueous solution with a bath ratio of 1:20 and soak at 65°C for 2.5 hours. Then rinse with deionized water until neutral and pre-dry at 95°C for 25 minutes.

[0058] S5: Dye liquor treatment: Immerse the pretreated base fabric in the dye liquor at a ratio of 1:25. The dye liquor contains 16g disperse dye, 13g urea, 1.7g fatty alcohol polyoxyethylene ether, 20g sodium sulfate, 3.2g hexadecyltrimethylammonium bromide, 2.6g sodium bicarbonate, and 7.5g sodium naphthalenesulfonate formaldehyde condensate. The treatment process starts at 36℃, increases the temperature to 76℃ at a rate of 2.4℃ / min and holds for 14min, then increases the temperature to 112℃ at a rate of 1.1℃ / min and holds for 10min, followed by increasing the temperature to 128℃ at a rate of 1.1℃ / min and holding for 36min. After that, remove the base fabric and wash it three times with 50℃ deionized water for 15min each time, and then dry it at 105℃.

[0059] S6: Finishing Solution Treatment: Prepare a finishing solution by taking 13g of perfluorohexyl ethyl acrylate copolymer, 75g of anhydrous ethanol, 4.5g of nano zinc oxide, 0.8g of polyhexamethylene biguanide hydrochloride, 6g of composite powder, and 92g of deionized water; first, dissolve the perfluorohexyl ethyl acrylate copolymer in anhydrous ethanol and stir at 700 rpm for 25 min at 40℃ until completely dissolved, then add nano zinc oxide, polyhexamethylene biguanide hydrochloride, composite powder, and deionized water, and continue stirring at 1000 rpm for 40 min to obtain the finishing solution; immerse the dried base fabric in the finishing solution for 55 min, with a base fabric to finishing solution bath ratio of 1:22; then perform a two-dip two-nip treatment on the base fabric, with a nip temperature of 33℃, a finishing solution concentration of 40g / L in the nip groove, a nip pressure of 2.2MPa, and a liquid carry-over rate of 73%.

[0060] S7: Setting treatment: The impregnated base fabric is first pre-dried at 108℃ for 22 minutes, and then set at 172℃ for 32 seconds. The setting machine speed is 21m / min to obtain a waterproof, oil-proof and stain-resistant fabric.

[0061] Performance indicators Test Results Waterproof (water-repellent rating) Level 4 Oil-resistant (oil-repellent rating) Level 5 Stain resistance (stain tolerance level) Level 5 Antibacterial (bacteriostatic rate) 98% Tensile strength 430N The fabric in Example 4 achieves optimal performance, with waterproofing stable at level 4, maintaining good waterproofing even after prolonged use in humid environments; oil and stain resistance consistently maintain level 5, effectively resisting various oils and stains, and its performance does not diminish after multiple washes; antibacterial performance is significantly improved, with an antibacterial rate of up to 98%, providing a wider range of bacterial inhibition and a longer-lasting effect; tensile strength is 430N, achieving optimal mechanical properties, possessing excellent tensile and abrasion resistance, and maintaining structural stability even in complex usage scenarios.

[0062] Comparative Example 1: Please see Figure 1 The present invention provides a comparative scheme: the difference from Example 2 is that no composite particles are added, while the remaining steps and raw material amounts are the same.

[0063] Performance indicators Test Results Waterproof (water-repellent rating) Level 3 Oil-resistant (oil-repellent rating) Level 4 Stain resistance (stain tolerance level) Level 4 Antibacterial (bacteriostatic rate) 80% Tensile strength 260N Comparative Example 1, lacking the addition of composite particles, exhibited significantly lower performance compared to Example 2. Water resistance dropped to Level 3, only able to block small amounts of light water droplets; even slightly stronger water droplets would penetrate. Oil and stain resistance both decreased to Level 4, weakening resistance to ordinary oil stains and dirt, leaving residue after washing. Antibacterial performance declined sharply, with an inhibition rate of only 80%, indicating a significantly reduced effect on bacterial inhibition. Tensile strength was 260N, demonstrating insufficient mechanical stability of the fabric, making it prone to stretching deformation and even damage during daily use. This clearly demonstrates the crucial role of composite particles in improving the fabric's water resistance, oil resistance, stain resistance, antibacterial properties, and mechanical performance.

[0064] Comparative Example 2: Please see Figure 1 The present invention provides a comparative scheme: the difference from Example 2 is that the base fabric does not undergo a pretreatment step, while the remaining steps and raw material amounts are the same.

[0065] Performance indicators Test Results Waterproof (water-repellent rating) Level 3 Oil-resistant (oil-repellent rating) Level 4 Stain resistance (stain tolerance level) Level 4 Antibacterial (bacteriostatic rate) 83% Tensile strength 290N Comparative Example 2, due to the omission of the base fabric pretreatment step, showed a significant performance difference compared to Example 2. Water resistance dropped to level 3, with water droplets easily penetrating the fabric surface; oil and stain resistance were both level 4, indicating that oil and stains adhered easily and were more difficult to clean; antibacterial performance decreased, with an inhibition rate of 83%, weakening the inhibitory effect on bacteria; tensile strength was 290N, indicating insufficient tensile strength of the fabric, mainly due to the failure to remove impurities from the base fabric surface, affecting the adhesion of subsequent dyeing and finishing solutions, resulting in weak bonding of functional components and consequently a decline in the overall performance of the fabric, highlighting the importance of the base fabric pretreatment step.

[0066] Comparative Example 3: Please see Figure 1The present invention provides a comparative scheme: the difference from Example 2 is that ordinary nylon fiber is used instead of modified nylon fiber, while the remaining steps and raw material amounts are the same.

[0067] Performance indicators Test Results Waterproof (water-repellent rating) Level 3 Oil-resistant (oil-repellent rating) Level 4 Stain resistance (stain tolerance level) Level 4 Antibacterial (bacteriostatic rate) 85% Tensile strength 300N In Comparative Example 3, after replacing the modified nylon fiber with ordinary nylon fiber, the performance was significantly lower than that of Example 2. The waterproof performance dropped to level 3, which can only meet the needs of slight waterproofing; the oil and stain resistance were both level 4, which is insufficient to resist oil and stains; the antibacterial performance declined, with an antibacterial rate of 85%, mainly because the surface of ordinary nylon fiber lacks the active groups introduced by chitosan modification, which cannot form an effective bond with composite particles and composite powders, and also loses the natural antibacterial properties of chitosan; the tensile strength was 300N. Although the mechanical properties of the fabric were better than those of Comparative Examples 1 and 2, they were still inferior to those of Example 2, indicating the important role of modified nylon fiber in improving the overall performance of the fabric.

[0068] Comparative Example 4: Please see Figure 1 The present invention provides a comparative scheme: the difference from Example 2 is that composite particles are not prepared, and an equal mass of nano-titanium dioxide is directly added to replace the composite particles, while the remaining steps and raw material amounts are the same as in Example 2.

[0069] The preparation steps are as follows: The difference is: S2: Weft yarn preparation: Replace the composite particles in Example 2 with nano-titanium dioxide (particle size 50nm), and directly mix and spin them with polyhydroxyalkanoate fibers, modified nylon fibers, and blended fibers; The remaining steps are completely consistent with those in Example 2.

[0070] Performance indicators Test Results Waterproof (water-repellent rating) Level 3 Oil-resistant (oil-repellent rating) Level 4 Stain resistance (stain tolerance level) Level 4 Antibacterial (bacteriostatic rate) 82% Tensile strength 280N Functional durability (after 50 washes) Waterproof (Level 2), oil-proof (Level 3), antibacterial rate 65%. Comparative Example 4, by directly adding an equal mass of nano-titanium dioxide to replace the composite particles, showed that its waterproof performance was only level 3, oil resistance level 4, and stain resistance level 4, with an antibacterial rate of only 82% and a tensile strength of 280N. Furthermore, after 50 washes, its functionality significantly decreased, with waterproof performance dropping to level 2, oil resistance level 3, and antibacterial rate to only 65%. The fabric also became prone to pilling and deformation. In stark contrast, Example 2, which incorporated composite particles of titanium dioxide and montmorillonite, not only achieved superior initial performance, reaching waterproof level 4, oil resistance level 5, and stain resistance level 5, but also... With an antibacterial rate of 92% and a tensile strength of 350N, the fabric maintains a good state of waterproof level 3, oil-proof level 4, and antibacterial rate of 85% even after 50 washes. The fabric structure is stable with no obvious deformation, which fully demonstrates that this technical solution, through the synergistic effect of composite particles as a carrier, not only solves the problems of easy agglomeration and uneven functional distribution when titanium dioxide is directly added, but also strengthens the binding force between functional components and fibers. This achieves a comprehensive improvement in waterproof, oil-proof, stain-resistant performance, antibacterial effect, mechanical strength, and functional durability, which is significantly better than the technical solution of directly adding titanium dioxide.

[0071] A comparison of Examples 1 to 4 clearly reveals that the core variables in Examples 1 to 4 exhibit a gradient optimization trend: the amount of titanium dioxide-containing composite particles increased from 3g to 8g, and the total amount of modified nylon fiber increased from 36g warp + 33g weft (Example 1) to 42g warp + 45g weft (Example 4). Simultaneously, process parameters were upgraded, such as the calcination temperature for composite particle preparation increasing from 500℃ to 600℃, the weft mixing speed increasing from 1750 rpm to 2000 rpm, and the setting temperature increasing from 168℃ to 172℃. These changes collectively drive a continuous leap in the overall performance of the fabric. The titanium dioxide-containing composite particles are the core functional carrier. The titanium dioxide generated from the hydrolysis of tetrabutyl titanate forms a dense hydrophilic film on the yarn surface, providing basic support for oil and stain resistance. The chitosan active groups on the surface of the modified nylon fiber strengthen the binding force with the composite particles and powders, further enhancing functional stability in conjunction with optimized process parameters. The final fabric antibacterial rate gradually increased from 85% in Example 1 to 98% in Example 4, the tensile strength increased from 280N to 430N, the waterproof performance steadily improved from level 3 to level 4, and the oil and stain resistance performance was upgraded from level 4 in Example 1 to level 5 in Examples 2 to 4. Moreover, the performance of Example 4 did not show significant degradation after multiple washes, fully demonstrating excellent stability and durability.

[0072] Comparing the performance differences of Comparative Examples 1 to 4 further highlights the necessity of core components and key processes: Comparative Example 1, lacking titanium dioxide-containing composite particles, experienced a drop in waterproof performance from level 4 in Example 2 to level 3, oil and stain resistance from level 5 to level 4, antibacterial rate from 92% to 80%, and tensile strength from 350N to 260N. This confirms the mechanical support role of the montmorillonite layered structure in the composite particles, which synergizes with the oil and stain barrier function of the titanium dioxide water film to jointly ensure the core performance of the fabric. Comparative Example 2, omitting the base fabric pretreatment step, resulted in impurities on the base fabric surface causing poor adhesion of the dye and finishing solutions, leading to a drop in waterproof performance to level 3, antibacterial rate to 83%, and tensile strength to 290N. This highlights the fundamental role of pretreatment in constructing the functional layers. Comparative Example 3 used ordinary nylon fibers instead of... After the modified nylon fiber was replaced, the performance of ordinary nylon fiber declined significantly, with a water resistance rating of 3, an antibacterial rate of 85%, and a tensile strength of 300N. The core reason is that ordinary nylon lacks the active groups introduced by chitosan modification, which not only loses the natural antibacterial properties of chitosan but also fails to form a stable bond with composite particles and composite powders. This confirms the functional adaptability value of modified nylon fiber. In Comparative Example 4, an equal mass of nano-titanium dioxide was used to directly replace the composite particles, and the initial performance only reached a water resistance rating of 3, an oil resistance rating of 4, and an antibacterial rate of 82%. After 50 washes, the water resistance rating dropped to 2 and the antibacterial rate was only 65%. In contrast, Example 2 used titanium dioxide-montmorillonite composite particles, which not only had better initial performance but also maintained a water resistance rating of 3 and an antibacterial rate of 85% after washing. This fully demonstrates the core advantages of composite particles in solving the agglomeration of nanoparticles and strengthening the functional bonding force.

[0073] In summary, this technical solution achieves a comprehensive improvement in the fabric's waterproof, oil-repellent, stain-resistant, antibacterial, and mechanical properties through the water film effect of titanium dioxide composite particles, the active combination of modified nylon fibers, and gradient optimization of process parameters. Compared to traditional solutions, it completely solves the pain points of single function and easy performance degradation. While achieving level 4 waterproof and level 5 oil-repellent and stain-resistant properties, it also boasts a high antibacterial rate of 98% and a tensile strength of 430N. The combination of nylon substrate and modified bioactive components better meets environmental protection and practical needs.

[0074] To further illustrate the beneficial technical effects of the waterproof, oil-repellent, and stain-resistant fabric and its preparation method according to the embodiments of the present invention, relevant performance tests were conducted on the waterproof, oil-repellent, and stain-resistant fabric and its preparation method according to Examples 1-4 and Comparative Examples 1-4; the test methods are as follows: 1. Waterproof (water repellency rating): Take a fabric sample, spray the sample surface with a specified amount of water from a specific height, observe the adhesion and penetration of water droplets on the sample surface, and evaluate the water repellency rating based on the water droplet residue and penetration degree.

[0075] 2. Oil Repellency (Oil Repellency Rating): Take oil reagents of different viscosities and drop them onto the surface of the fabric sample. Observe the diffusion and penetration of the oil droplets on the sample surface. The oil repellency rating is determined based on the highest oil viscosity at which the oil droplets do not penetrate or diffuse.

[0076] 3. Stain resistance (stain resistance level): Apply common stains evenly to the surface of the fabric sample, let it stand for a specified time, clean it in the usual way, observe the stain residue on the sample surface after cleaning, and evaluate the stain resistance level according to the degree of residue.

[0077] 4. Antibacterial (bacteriostatic rate): A quantitative bacterial solution was inoculated onto the surface of the fabric sample and cultured at a suitable temperature for a specified time. A blank control group was set up at the same time. After the culture was completed, the number of viable bacteria in the two groups was counted and the antibacterial rate was calculated.

[0078] 5. Tensile strength: Cut the fabric sample into standard-sized specimens, fix them on a tensile testing machine, stretch the specimens at a constant rate, and record the maximum tensile force that the specimens can withstand when they break. This is the tensile strength.

[0079] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific technical solutions or characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A waterproof, oil-proof, and stain-resistant fabric, characterized in that, The fabric comprises the following raw materials in parts by weight: 40-65 parts nylon fiber, 15-30 parts polyhydroxyalkanoate fiber, 10-23 parts modified nylon fiber, 3-8 parts composite particles, and 2-6 parts composite powder. The fabric is woven from warp and weft yarns, wherein the warp yarns are made by blending and twisting nylon fibers and modified nylon fibers, and the weft yarns are made by blending and spinning nylon fibers, polyhydroxyalkanoate fibers and composite particles. The composite powder is attached to the fabric surface by the finishing liquid, and the titanium dioxide in the composite particles is evenly distributed on the surface and inside of the warp and weft yarns through yarn blending and spinning to form a dense water film to achieve oil and stain resistance.

2. The waterproof, oil-proof, and stain-resistant fabric according to claim 1, characterized in that, The preparation process of the modified nylon fiber is as follows: nylon fiber is immersed in a chitosan aqueous solution with a mass concentration of 2%-5%, stirred at 200-300 rpm for 1.5-3 hours at 45-60℃, then taken out and dried at 90-100℃ to constant weight, and obtained after cooling.

3. The waterproof, oil-proof, and stain-resistant fabric according to claim 1, characterized in that, The preparation process of the composite particles is as follows: Step A: Add montmorillonite to a 10%-15% hydrochloric acid aqueous solution, with a mass ratio of montmorillonite to hydrochloric acid aqueous solution of 1:8-12. Stir and activate at 60-70℃ and 300-500 rpm for 2-3 hours, then filter to obtain filter residue. Step B: Rinse the filter residue obtained in Step A repeatedly with deionized water until the pH of the aqueous solution after rinsing is 6.8-7.

2. Then place the rinsed filter residue in an oven at 105-115℃ and dry it for 4-6 hours to obtain activated montmorillonite. Step C: Dissolve tetrabutyl titanate in anhydrous ethanol at a volume ratio of 1:3-5, and stir until completely dissolved to obtain a titanium alcohol solution. Step D: Add the activated montmorillonite obtained in step B and a nitric acid aqueous solution with a mass concentration of 5%-8% to the titanium alcohol solution obtained in step C. The mass ratio of activated montmorillonite to tetrabutyl titanate is 1:2-4, and the volume ratio of nitric acid aqueous solution to titanium alcohol solution is 1:10-15. Stir the reaction at 200-300 rpm for 4-6 hours at 50-60℃ to obtain the reaction solution. Step E: Place the reaction solution obtained in step D into a centrifuge and centrifuge at 3000-4000 rpm for 15-25 min to obtain a precipitate; Step F: Wash the precipitate obtained in step E with anhydrous ethanol 3-5 times, then place the washed precipitate in a muffle furnace and calcine it at 500-600℃ for 2-3 hours. After calcination, allow it to cool naturally to room temperature to obtain composite particles.

4. The waterproof, oil-proof, and stain-resistant fabric according to claim 1, characterized in that, The preparation process of the composite powder is as follows: Step a: Dissolve calcium nitrate in deionized water to prepare a calcium nitrate solution with a mass concentration of 8%-12%; dissolve diammonium hydrogen phosphate in deionized water to prepare a diammonium hydrogen phosphate solution with a mass concentration of 5%-8%. Step b: Add chitosan to an aqueous acetic acid solution with a mass concentration of 1%-2% and stir at 40-50℃ until completely dissolved to obtain a chitosan acetic acid solution; Step c: Slowly add calcium nitrate solution dropwise to diammonium hydrogen phosphate solution while stirring, adjust the pH value to 9.0-10.0, and react at 60-70℃ for 2-3 hours to obtain hydroxyapatite suspension; Step d: Add the chitosan acetate solution to the hydroxyapatite suspension, with a mass ratio of chitosan to hydroxyapatite of 1:4-6. Stir the mixture at 50-60℃ for 1.5-2.5 hours to obtain the composite suspension. Step e: Centrifuge the composite suspension to obtain a precipitate, wash the precipitate with deionized water until neutral, then dry it at 80-90℃, pulverize it and pass it through a 200-300 mesh sieve to obtain the composite powder.

5. A method for preparing a waterproof, oil-repellent, and stain-resistant fabric as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: Preparation of warp yarn: Mix nylon fiber and modified nylon fiber according to the weight ratio, and process them with a twisting process of 9-14 twists / cm to make warp yarn; S2: Preparation of weft yarn: Take nylon fiber, polyhydroxyalkanoate fiber and composite particles containing titanium dioxide according to the weight parts, put them into a high-speed mixer. The agitator of the high-speed mixer is a ribbon agitator. Mix at 80-100℃ and 1500-2000 rpm for 20-40 minutes. Then add the mixture to a composite spinning machine and spin it at a spinning temperature of 180-220℃ and a spinning speed of 900-1300 m / min to make weft yarn. S3: Weaving the base fabric: The warp yarns made in S1 and the weft yarns made in S2 are placed on a rapier loom and woven at a weaving speed of 220-320 rpm, with a warp density of 380-450 ends / 10 cm and a weft density of 320-380 ends / 10 cm to obtain the base fabric; S4: Base fabric pretreatment: The base fabric obtained in S3 is placed in an aqueous solution containing 0.5%-1.2% citric acid by mass, with a bath ratio of 1:15-20 between the base fabric and the aqueous solution of citric acid. It is soaked at 50-65℃ for 1.5-2.5 hours, then rinsed with deionized water until neutral, and pre-dried at 85-95℃ for 15-25 minutes. S5: Dye liquor treatment: Immerse the pretreated base fabric in the dye liquor. The ratio of base fabric to dye liquor is 1:20-25. The dye liquor contains, by weight, 5-16 parts disperse dye, 7-13 parts urea, 0.9-1.7 parts fatty alcohol polyoxyethylene ether, 12-20 parts sodium sulfate, 1.8-3.2 parts hexadecyltrimethylammonium bromide, 1.5-2.6 parts sodium bicarbonate, and 3.5-7.5 parts sodium naphthalenesulfonate formaldehyde condensate. The processing procedure is as follows: starting from 32-36℃, the temperature is increased to 72-76℃ at a rate of 1.8-2.4℃ / min and held for 10-14 min; then the temperature is increased to 98-112℃ at a rate of 0.9-1.1℃ / min and held for 6-10 min; next, the temperature is increased to 122-128℃ at a rate of 0.9-1.1℃ / min and held for 28-36 min; after that, the base fabric is taken out and washed with deionized water at 40-50℃ 2-3 times, 10-15 min each time, and then dried at 95-105℃. S6: Finishing solution treatment: Take 7-13 parts by weight of perfluorohexyl ethyl acrylate copolymer, 55-75 parts of anhydrous ethanol, 2.5-4.5 parts of nano zinc oxide, 0.3-0.8 parts of polyhexamethylene biguanide hydrochloride, 2-6 parts of composite powder, and 85-92 parts of deionized water. Preparation of finishing solution: First, dissolve perfluorohexyl ethyl acrylate copolymer in anhydrous ethanol and stir at 500-700 rpm for 15-25 min at 30-40℃ until completely dissolved. Then add nano zinc oxide, polyhexamethylene biguanide hydrochloride, composite powder and deionized water, and continue stirring at 800-1000 rpm for 30-40 min to obtain finishing solution. The dried base fabric is immersed in the finishing solution for 35-55 minutes, with a base fabric to finishing solution bath ratio of 1:18-22; subsequently, the base fabric undergoes a two-dip and two-padding treatment, with a padding temperature of 28-33℃, a finishing solution concentration of 25-40 g / L in the padding tank, a padding pressure of 1.9-2.2 MPa, and a liquid retention rate of 68-73%. S7: Setting treatment: The impregnated base fabric is first pre-dried at a temperature of 102-108℃ for 18-22 minutes, and then set at a temperature of 165-172℃ for 25-32 seconds. The setting machine speed is 19-21m / min, resulting in a waterproof, oil-proof and stain-resistant fabric.

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