Anti-pilling cashmere fabric and preparation method thereof

Abstract

The invention relates to the technical field of textile, and discloses an anti-pilling cashmere fabric and a preparation method thereof, and the anti-pilling cashmere fabric is prepared by a plurality of novel preparation processes such as an in-situ polymerization method, a microemulsion method and ultrasonic-assisted modification. According to the in-situ polymerization method, new components are polymerized on a polyurethane molecular chain in situ by accurately controlling reaction steps and conditions; according to the microemulsion method, the microemulsion type finishing agent is obtained through the steps of homogeneous solution formation, neutralization reaction, organic solvent removal and the like. Ultrasonic treatment is introduced in a key reaction step of ultrasonic-assisted modification, so that intermolecular collision and diffusion are promoted, the reaction is accelerated, and the uniformity and stability of the finishing agent are improved, thereby preparing the cashmere fabric finishing agent which has excellent anti-pilling performance and keeps soft and comfortable characteristics. The anti-pilling performance and the hand feeling comfort of the cashmere fabric are both improved, and the urgent demand of the market for the high-quality cashmere fabric is met.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and specifically to an anti-pilling cashmere fabric and a preparation method thereof. Background Art

[0002] The present invention relates to the technical field of textiles, and specifically to an anti-pilling cashmere fabric and a preparation method thereof. Cashmere fabrics, with their unique softness and excellent warmth retention performance, occupy an important position in the textile market and are deeply loved by consumers. However, the natural scale structure of cashmere fibers has become a major drawback during their use. This structural characteristic causes cashmere fabrics to easily pill during friction and wearing, not only damaging the aesthetic appearance of the fabric but also affecting its durability and wearing experience.

[0003] To address the pilling problem of cashmere fabrics, the industry has conducted extensive exploration and research, and developed a variety of anti-pilling finishing agents. Among them, waterborne polyurethane-based and modified colloidal polysilicate-based finishing agents are two relatively common types. Waterborne polyurethane-based finishing agents improve the anti-pilling performance of cashmere fabrics by forming a wear-resistant network resin film covering the surface of cashmere fibers. However, after multiple washes, the anti-pilling effect of such finishing agents often significantly decreases, and their water wash resistance is poor, limiting their long-term application effect. On the other hand, modified colloidal polysilicate-based finishing agents can form a protective film on the fiber surface, effectively reducing the friction and entanglement between fibers, achieving the anti-pilling effect. Unfortunately, the handle of cashmere fabrics treated with such finishing agents often becomes too hard, sacrificing the original soft and comfortable characteristics of cashmere fabrics. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an anti-pilling cashmere fabric and a preparation method thereof, achieving a double improvement in the anti-pilling performance and handle comfort of cashmere fabrics, and meeting the urgent market demand for high-quality cashmere fabrics.

[0005] An anti-pilling cashmere fabric is obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of a cashmere fabric, followed by drying and curing.

[0006] Among them, the cashmere anti-pilling finishing agent comprises the following components: 32 - 42 parts of polycarbonate diol, 18 - 28 parts of isophorone diisocyanate, 3 - 7 parts of dimethylolpropionic acid, 2 - 3 parts of chitin nanofibers, 8 - 12 parts of polyether silicone oil, 2 - 3 parts of triethylamine, 1 - 2 parts of nano-silica, 1 - 2 parts of crosslinking agent, 0.5 - 1.5 parts of graphene quantum dots, 3 - 5 parts of plant tannins, 1 - 3 parts of fluorosilicone copolymer, and 20 - 50 parts of deionized water.

[0007] Preferably, the diameter of the chitin nanofibers is 50-100 nm, the particle size of the nano-silica is 15 nm, and the nano-silica is surface aminated.

[0008] Preferably, a method for preparing a pilling-resistant cashmere fabric includes the following steps:

[0009] (1) Vacuum dehydrate the polycarbonate diol at 110-120 °C for 1-2 hours, cool down to 70-80 °C, add isophorone diisocyanate and dibutyltin dilaurate, and react for 2-3 hours to generate a polyurethane prepolymer with terminal isocyanate groups;

[0010] (2) Add the polyurethane prepolymer, graphene quantum dots, vegetable tannins, and fluorosilicon copolymer into a reaction kettle, simultaneously add dimethylolpropionic acid, continue to react for 1-2 hours, cool down to 40-50 °C, add triethylamine to neutralize the carboxyl groups in the system, adjust the pH value to 7.5-8.5, and slowly add deionized water for emulsification under stirring conditions to obtain an aqueous polyurethane emulsion;

[0011] (3) Add nano-silica and a crosslinking agent into the aqueous polyurethane emulsion, stir evenly to obtain a finishing agent;

[0012] (4) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0013] Preferably, a method for preparing a pilling-resistant cashmere fabric further includes the following steps:

[0014] (1) Mix the polycarbonate diol, isophorone diisocyanate, dimethylolpropionic acid, chitin nanofibers, polyether silicone oil, graphene quantum dots, vegetable tannins, and fluorosilicon copolymer, add acetone, and stir evenly to form a homogeneous solution;

[0015] (2) Dissolve triethylamine in a small amount of deionized water, slowly drop it into the homogeneous solution, while stirring vigorously, carry out a neutralization reaction to form a water-in-oil emulsion, then remove the organic solvent by vacuum distillation, while continuing to stir, form a microemulsion, add nano-silica, a crosslinking agent, and deionized water, stir evenly to obtain a final microemulsion-type aqueous polyurethane-based cashmere pilling-resistant finishing agent;

[0016] (3) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0017] Beneficial technical effects:

[0018] The present invention has developed a variety of new preparation processes such as in-situ polymerization method, microemulsion method, and ultrasonic-assisted modification. The in-situ polymerization method enables the in-situ polymerization of new components onto the polyurethane molecular chain by precisely controlling the reaction steps and conditions; the microemulsion method obtains a microemulsion-type finishing agent through steps such as forming a homogeneous solution, neutralization reaction, and removal of organic solvents; ultrasonic-assisted modification introduces ultrasonic treatment in key reaction steps, promoting intermolecular collision and diffusion, accelerating the reaction, and improving the uniformity and stability of the finishing agent, thereby preparing a cashmere fabric finishing agent with excellent anti-pilling performance and maintaining soft and comfortable characteristics.

[0019] By precisely controlling the prepolymer preparation process, optimizing the finishing agent formulation and preparation process, the anti-pilling performance of cashmere fabrics has been significantly improved. With the addition and ratio optimization of new components, it is expected that the anti-pilling grade can be improved by 1-2 levels from the existing level, effectively reducing the formation of pills on the surface of cashmere fabrics. While improving the anti-pilling performance, attention is paid to maintaining the original soft and comfortable characteristics of cashmere fabrics; introducing plant tannins, whose rich phenolic hydroxyl structure can form hydrogen bonds and cross-linking reactions with polyurethane molecules, making the finishing agent have good antibacterial properties, and the antibacterial rate against common bacteria such as Staphylococcus aureus and Escherichia coli can reach more than 90%. Adding fluorosilicone copolymer, which combines the low surface energy of fluorine element and the softness and lubricity of silicon element, can significantly reduce the surface energy of the fabric, making the contact angle of the fabric reach 120°-140°, achieving good waterproof and oil-proof effects, and increasing the practicality of cashmere fabrics in complex environments such as outdoors. Specific embodiments

[0020] Example 1

[0021] 1. Anti-pilling cashmere fabric obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of cashmere fabric and drying and curing it;

[0022] Among them, the cashmere anti-pilling finishing agent has the following components: 42 parts of polycarbonate diol, 28 parts of isophorone diisocyanate, 7 parts of dimethylolpropionic acid, 3 parts of chitin nanofibers with a diameter of 100 nm, 12 parts of polyether silicone oil, 3 parts of triethylamine, 2 parts of nano-silica with a particle size of 15 nm, 2 parts of cross-linking agent, 1.5 parts of graphene quantum dots, 5 parts of plant tannins, 3 parts of fluorosilicone copolymer, and 20 parts of deionized water.

[0023] 2. A preparation method of anti-pilling cashmere fabric, comprising the following steps:

[0024] (1) Vacuum dehydrate polycarbonate diol at 110 °C for 1 hour, cool down to 70 °C, add isophorone diisocyanate and dibutyltin dilaurate, and react for 2 hours to generate a polyurethane prepolymer with terminal isocyanate groups.

[0025] (2) Add the polyurethane prepolymer, graphene quantum dots, vegetable tannins, and fluorosilicon copolymer into a reaction kettle, and simultaneously add dimethylolpropionic acid. Continue the reaction for 1 hour, cool down to 40 °C, add triethylamine to neutralize the carboxyl groups in the system, adjust the pH value to 7.5, and slowly add deionized water for emulsification under stirring conditions to obtain an aqueous polyurethane emulsion.

[0026] (3) Add nano-silica and a crosslinking agent into the aqueous polyurethane emulsion, and stir evenly to obtain a finishing agent.

[0027] (4) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0028] Example 2

[0029] 1. An anti-pilling cashmere fabric obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of the cashmere fabric, followed by drying and curing;

[0030] Among them, the cashmere anti-pilling finishing agent comprises the following components: 32 parts of polycarbonate diol, 18 parts of isophorone diisocyanate, 3 parts of dimethylolpropionic acid, 2 parts of chitin nanofibers with a diameter of 50 nm, 8 parts of polyether silicone oil, 2 parts of triethylamine, 1 part of nano-silica with a particle size of 15 nm, 1 part of crosslinking agent, 0.5 part of graphene quantum dots, 3 parts of vegetable tannins, 1 part of fluorosilicon copolymer, and 50 parts of deionized water.

[0031] 2. A preparation method of an anti-pilling cashmere fabric, comprising the following steps:

[0032] (1) Vacuum dehydrate polycarbonate diol at 120 °C for 2 hours, cool down to 80 °C, add isophorone diisocyanate and dibutyltin dilaurate, and react for 3 hours to generate a polyurethane prepolymer with terminal isocyanate groups.

[0033] (2) Add the polyurethane prepolymer, graphene quantum dots, vegetable tannins, and fluorosilicon copolymer into a reaction kettle, and simultaneously add dimethylolpropionic acid. Continue the reaction for 2 hours, cool down to 50 °C, add triethylamine to neutralize the carboxyl groups in the system, adjust the pH value to 8.5, and slowly add deionized water for emulsification under stirring conditions to obtain an aqueous polyurethane emulsion.

[0034] (3) Add nano-silica and a crosslinking agent into the aqueous polyurethane emulsion, and stir evenly to obtain a finishing agent.

[0035] (4) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0036] Example 3

[0037] 1. An anti-pilling cashmere fabric obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of a cashmere fabric and then drying and curing it.

[0038] Among them, the cashmere anti-pilling finishing agent consists of the following components: 40 parts of polycarbonate diol, 20 parts of isophorone diisocyanate, 5 parts of dimethylolpropionic acid, 2 parts of chitin nanofibers with a diameter of 80 nm, 10 parts of polyether silicone oil, 2 parts of triethylamine, 1 part of nano-silica with a particle size of 15 nm, 1 part of cross-linking agent, 1 part of graphene quantum dots, 4 parts of plant tannins, 2 parts of fluorosilicone copolymer, and 30 parts of deionized water.

[0039] 2. A preparation method of an anti-pilling cashmere fabric, comprising the following steps:

[0040] (1) Vacuum dehydrate polycarbonate diol at 115 °C for 1 hour, cool it down to 75 °C, add isophorone diisocyanate and dibutyltin dilaurate, and react for 2 hours to form a polyurethane prepolymer with terminal isocyanate groups.

[0041] (2) Add the polyurethane prepolymer, graphene quantum dots, plant tannins, and fluorosilicone copolymer into a reaction kettle, simultaneously add dimethylolpropionic acid, continue to react for 1 hour, cool it down to 45 °C, add triethylamine to neutralize the carboxyl groups in the system, adjust the pH value to 8, and slowly add deionized water for emulsification under stirring conditions to obtain an aqueous polyurethane emulsion.

[0042] (3) Add nano-silica and cross-linking agent into the aqueous polyurethane emulsion, stir evenly to obtain a finishing agent.

[0043] (4) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0044] Example 4

[0045] 1. An anti-pilling cashmere fabric obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of a cashmere fabric and then drying and curing it.

[0046] Among them, the cashmere anti-pilling finishing agent consists of the following components: 38 parts of polycarbonate diol, 25 parts of isophorone diisocyanate, 6 parts of dimethylolpropionic acid, 2 parts of chitin nanofibers with a diameter of 100 nm, 9 parts of polyether silicone oil, 3 parts of triethylamine, 1 part of nano-silica with a particle size of 15 nm, 1 part of cross-linking agent, 1.5 parts of graphene quantum dots, 5 parts of plant tannins, 3 parts of fluorosilicone copolymer, and 30 parts of deionized water.

[0047] 2. A preparation method of an anti-pilling cashmere fabric, comprising the following steps:

[0048] (1) Vacuum dehydrate the polycarbonate diol at 110 °C for 1 hour, cool down to 80 °C, add isophorone diisocyanate and dibutyltin dilaurate, and react for 2 hours to produce a polyurethane prepolymer with terminal isocyanate groups;

[0049] (2) Add the polyurethane prepolymer, graphene quantum dots, vegetable tannins and fluorosilicone copolymer into a reaction kettle, add dimethylolpropionic acid at the same time, continue to react for 2 hours, cool down to 50 °C, add triethylamine to neutralize the carboxyl groups in the system, adjust the pH value to 8, and slowly add deionized water for emulsification under stirring conditions to obtain an aqueous polyurethane emulsion;

[0050] (3) Add nano-silica and a crosslinking agent into the aqueous polyurethane emulsion, stir evenly to obtain a finishing agent;

[0051] (4) Evenly coat the prepared finishing agent on the surface of the cashmere fabric.

[0052] Example 5

[0053] 1. A pilling-resistant cashmere fabric obtained by evenly coating a cashmere pilling-resistant finishing agent on the surface of the cashmere fabric, drying and curing;

[0054] Among them, the cashmere pilling-resistant finishing agent has the following components: 42 parts of polycarbonate diol, 18 parts of isophorone diisocyanate, 4 parts of dimethylolpropionic acid, 2 parts of 100 nm chitin nanofibers, 12 parts of polyether silicone oil, 3 parts of triethylamine, 1 part of 15 nm nano-silica, 2 parts of crosslinking agent, 1.5 parts of graphene quantum dots, 3 parts of vegetable tannins, 2 parts of fluorosilicone copolymer, and 45 parts of deionized water.

[0055] 2. A preparation method of a pilling-resistant cashmere fabric, comprising the following steps:

[0056] (1) Vacuum dehydrate the polycarbonate diol at 115 °C for 1 hour, cool down to 70 °C, add isophorone diisocyanate and dibutyltin dilaurate, and react for 2 hours to produce a polyurethane prepolymer with terminal isocyanate groups;

[0057] (2) Add the polyurethane prepolymer, graphene quantum dots, vegetable tannins and fluorosilicone copolymer into a reaction kettle, add dimethylolpropionic acid at the same time, continue to react for 2 hours, cool down to 40 °C, add triethylamine to neutralize the carboxyl groups in the system, adjust the pH value to 8.5, and slowly add deionized water for emulsification under stirring conditions to obtain an aqueous polyurethane emulsion;

[0058] (3) Add nano-silica and a crosslinking agent into the aqueous polyurethane emulsion, stir evenly to obtain a finishing agent;

[0059] (4) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0060] Example 6

[0061] 1. A pilling-resistant cashmere fabric obtained by uniformly coating a cashmere pilling-resistant finishing agent on the surface of the cashmere fabric, followed by drying and curing;

[0062] Among them, the cashmere pilling-resistant finishing agent comprises: 42 parts of polycarbonate diol, 28 parts of isophorone diisocyanate, 7 parts of dimethylolpropionic acid, 3 parts of chitin nanofibers with a diameter of 100 nm, 12 parts of polyether silicone oil, 3 parts of triethylamine, 2 parts of nano-silica with a particle size of 15 nm, 2 parts of cross-linking agent, 1.5 parts of graphene quantum dots, 5 parts of plant tannins, 3 parts of fluorosilicone copolymer, and 20 parts of deionized water.

[0063] 2. A preparation method of the pilling-resistant cashmere fabric further comprises the following steps:

[0064] (1) Mix polycarbonate diol, isophorone diisocyanate, dimethylolpropionic acid, chitin nanofibers, polyether silicone oil, graphene quantum dots, plant tannins, and fluorosilicone copolymer, add acetone, and stir evenly to form a homogeneous solution.

[0065] (2) Dissolve triethylamine in a small amount of deionized water, slowly drop it into the homogeneous solution, and stir vigorously at the same time to carry out a neutralization reaction to form a water-in-oil emulsion. Then remove the organic solvent by vacuum distillation while continuing to stir to form a microemulsion. Add nano-silica, cross-linking agent, and deionized water, and stir evenly to obtain the final microemulsion-type aqueous polyurethane-based cashmere pilling-resistant finishing agent.

[0066] (3) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0067] Example 7

[0068] 1. A pilling-resistant cashmere fabric obtained by uniformly coating a cashmere pilling-resistant finishing agent on the surface of the cashmere fabric, followed by drying and curing;

[0069] Among them, the cashmere pilling-resistant finishing agent comprises: 32 parts of polycarbonate diol, 18 parts of isophorone diisocyanate, 3 parts of dimethylolpropionic acid, 2 parts of chitin nanofibers with a diameter of 50 nm, 8 parts of polyether silicone oil, 2 parts of triethylamine, 1 part of nano-silica with a particle size of 15 nm, 1 part of cross-linking agent, 0.5 parts of graphene quantum dots, 3 parts of plant tannins, 1 part of fluorosilicone copolymer, and 50 parts of deionized water.

[0070] 2. A preparation method of the pilling-resistant cashmere fabric further comprises the following steps:

[0071] (1) Mix polycarbonate diol, isophorone diisocyanate, dimethylolpropionic acid, chitin nanofibers, polyether silicone oil, graphene quantum dots, plant tannins and fluorosilicone copolymer, add acetone, and stir evenly to form a homogeneous solution.

[0072] (2) Dissolve triethylamine in a small amount of deionized water, slowly drop it into the homogeneous solution, stir vigorously at the same time, carry out a neutralization reaction to form a water-in-oil emulsion, then remove the organic solvent by vacuum distillation, continue to stir at the same time to form a microemulsion, add nano-silica, crosslinking agent and deionized water, stir evenly to obtain the final microemulsion-type waterborne polyurethane cashmere anti-pilling finishing agent.

[0073] (3) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0074] Example 8

[0075] 1. Anti-pilling cashmere fabric obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of the cashmere fabric, drying and curing;

[0076] Among them, the cashmere anti-pilling finishing agent has the following components: 40 parts of polycarbonate diol, 25 parts of isophorone diisocyanate, 4 parts of dimethylolpropionic acid, 2 parts of 100nm chitin nanofibers, 8 parts of polyether silicone oil, 2 parts of triethylamine, 1 part of 15nm nano-silica, 2 parts of crosslinking agent, 1.5 parts of graphene quantum dots, 5 parts of plant tannins, 1 part of fluorosilicone copolymer, 50 parts of deionized water.

[0077] 2. A preparation method of anti-pilling cashmere fabric further includes the following steps:

[0078] (1) Mix polycarbonate diol, isophorone diisocyanate, dimethylolpropionic acid, chitin nanofibers, polyether silicone oil, graphene quantum dots, plant tannins and fluorosilicone copolymer, add acetone, and stir evenly to form a homogeneous solution;

[0079] (2) Dissolve triethylamine in a small amount of deionized water, slowly drop it into the homogeneous solution, stir vigorously at the same time, carry out a neutralization reaction to form a water-in-oil emulsion, then remove the organic solvent by vacuum distillation, continue to stir at the same time to form a microemulsion, add nano-silica, crosslinking agent and deionized water, stir evenly to obtain the final microemulsion-type waterborne polyurethane cashmere anti-pilling finishing agent;

[0080] (3) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0081] Comparative Example 1

[0082] 1. An anti-pilling cashmere fabric obtained by drying and curing the surface of a cashmere fabric;

[0083] Comparative Example 2

[0084] 1. An anti-pilling cashmere fabric obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of a cashmere fabric and then drying and curing it;

[0085] Among them, the cashmere anti-pilling finishing agent consists of: 42 parts of polycarbonate diol, 28 parts of isophorone diisocyanate, 3 parts of triethylamine, 2 parts of nano-silica with a particle size of 15 nm, 2 parts of cross-linking agent, and 20 parts of deionized water.

[0086] 2. A preparation method of an anti-pilling cashmere fabric, comprising the following steps:

[0087] (1) Vacuum dehydrate polycarbonate diol at 110 °C for 1 hour, cool down to 70 °C, add isophorone diisocyanate and dibutyltin dilaurate, and react for 2 hours to generate a polyurethane prepolymer with terminal isocyanate groups.

[0088] (2) Add nano-silica and cross-linking agent to the polyurethane prepolymer, stir evenly to obtain a finishing agent.

[0089] (4) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

[0090] According to GB / T 4802.3, the anti-pilling performance of the examples and comparative examples was tested. The test conditions were: sample size 125 mm × 125 mm, rotation speed 60 r / min, the coarse fabric was flipped 7200 times, the fine fabric was flipped 14400 times, the rating light source was the D65 standard light source, and the number of raters was ≥ 3.

[0091] Table 1 shows the anti-pilling performance test results of the examples and comparative examples

[0092]

[0093] It can be seen from Examples 1-8 and Comparative Examples 1-2 that the anti-pilling grades of Examples 1-8 are better than those of Comparative Examples 1-2, and the pilling density and pill height are significantly reduced, verifying the enhancement of interfacial adhesion and wear resistance by nanomaterials. In Examples 6-8, due to the uniformly dispersed nano-silica and cross-linking agent forming a dense three-dimensional network, the washability is better and the anti-pilling grade is improved to 4.5.

[0094] In the finishing agent, polycarbonate diol is a bio-based soft segment that provides elasticity and toughness and reduces the brittleness of the film; isophorone diisocyanate is a hard segment monomer that forms rigid nodes and enhances the film-forming strength; dimethylolpropionic acid is a hydrophilic chain extender that introduces carboxyl groups to achieve water dispersion and control the molecular weight distribution; the diameter of chitin nanofibers is 50-100 nm, which binds to the polyurethane chain segment through hydrogen bonds, enhancing the interfacial adhesion and wear resistance; polyether silicone oil is grafted onto the polyurethane main chain to form a flexible side chain, improving the hand feeling and reducing the friction coefficient between fibers; triethylamine is a neutralizing agent that adjusts the pH of the emulsion to weakly alkaline to stabilize the dispersion system; the particle size of nano-silica is 15 nm, and its surface is amino-functionalized and uniformly dispersed in the film layer to enhance the anti-wear performance; the crosslinking agent is a post-crosslinking agent that forms a three-dimensional network during the baking process to enhance the wash resistance of the film layer; deionized water is a dispersion medium that participates in the formation and reaction of the emulsion.

[0095] In the present invention, due to the addition of new components and the optimization of the formulation, as well as the improvement of the preparation process, it is expected that the anti-pilling grade can be increased by 1-2 levels from the existing level, significantly reducing the formation of pills on the surface of cashmere fabrics; the introduction of plant tannins makes the finishing agent have good antibacterial properties, and the antibacterial rate against common bacteria such as Staphylococcus aureus and Escherichia coli can reach more than 90%. The addition of fluorosilicon copolymer significantly reduces the surface energy of the fabric, and the contact angle can reach 120°-140°, achieving good water and oil repellent effects. Graphene quantum dots endow the finishing agent with certain conductivity, reducing the surface resistance of cashmere fabrics and shortening the electrostatic half-life to 1-3 seconds, effectively reducing the static electricity phenomenon. Through the close combination of new components with polyurethane molecules and the three-dimensional network structure formed by the crosslinking agent, after more than 50 standard washes, the performance indicators of the finishing agent can still maintain more than 80% of the initial value.

[0096] Utilizing its water and oil repellent, antistatic and good anti-pilling properties, it is suitable for making cashmere warm clothing for outdoor sports, such as ski suits, mountaineering clothes, etc., to meet the functional requirements of outdoor environments for clothing. The antibacterial properties, good hand feeling and excellent anti-pilling properties make the finished cashmere products more suitable for business occasions, improving the product grade and comfort. The antibacterial properties can be applied to cashmere products in the field of medical care, such as cashmere scarves, shawls, etc., providing more hygienic and comfortable products for patients. By introducing new components, optimizing the formulation and developing new preparation processes, the comprehensive performance of waterborne polyurethane-based cashmere anti-pilling finishing agents has been significantly improved, including anti-pilling, antibacterial, water and oil repellent, antistatic and wash resistance, etc. Endowing cashmere fabrics with more functions expands their application scenarios and meets the special needs of different fields for cashmere products. The quality of the finished cashmere products has been improved, making them more competitive in the market and bringing higher economic benefits to enterprises. New processes such as in-situ polymerization, microemulsion method and ultrasonic-assisted modification have reduced the use of organic solvents to a certain extent and improved the reaction efficiency, meeting the requirements of environmental protection and sustainable development.

Claims

1. An anti-pilling cashmere fabric, characterized in that, The anti-pilling cashmere fabric is obtained by uniformly coating a cashmere anti-pilling finishing agent on the surface of the cashmere fabric and then drying and curing it. The cashmere anti-pilling finishing agent comprises the following components: 32-42 parts of polycarbonate diol, 18-28 parts of isophorone diisocyanate, 3-7 parts of dimethylolpropionic acid, 2-3 parts of chitin nanofibers, 8-12 parts of polyether silicone oil, 2-3 parts of triethylamine, 1-2 parts of nano-silica, 1-2 parts of cross-linking agent, 0.5-1.5 parts of graphene quantum dots, 3-5 parts of plant tannins, 1-3 parts of fluorosilicone copolymer, and 20-50 parts of deionized water.

2. The anti-pilling cashmere fabric according to claim 1, characterized in that, The diameter of the chitin nanofibers is 50-100 nm, the particle size of the nano-silica is 15 nm, and the nano-silica is subjected to surface amination treatment.

3. A method for preparing an anti-pilling cashmere fabric according to any one of claims 1, characterized in that, It includes the following steps: (1) Vacuum dehydrate the polycarbonate diol at 110-120 °C for 1-2 hours, cool it down to 70-80 °C, add isophorone diisocyanate and an organotin catalyst, and react for 2-3 hours to generate a polyurethane prepolymer with terminal isocyanate groups. (2) Add the polyurethane prepolymer, graphene quantum dots, plant tannins, and fluorosilicone copolymer to a reaction kettle, simultaneously add dimethylolpropionic acid, continue to react for 1-2 hours, cool down, add triethylamine to neutralize the carboxyl groups in the system, adjust the pH value, and slowly add deionized water for emulsification under stirring conditions to obtain an aqueous polyurethane emulsion. (3) Add nano-silica and a cross-linking agent to the aqueous polyurethane emulsion, stir evenly to obtain a finishing agent. (4) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

4. The preparation method of the anti-pilling cashmere fabric according to claim 3, characterized in that, It also includes the following steps: (1) Mix polycarbonate diol, isophorone diisocyanate, dimethylolpropionic acid, chitin nanofibers, polyether silicone oil, graphene quantum dots, plant tannins, and fluorosilicone copolymer, add an organic solvent, and stir evenly to form a homogeneous solution. (2) Dissolve triethylamine in a small amount of deionized water, slowly drop it into the homogeneous solution, and stir vigorously at the same time to carry out a neutralization reaction to form a water-in-oil emulsion. Then remove the organic solvent, and continue to stir to form a microemulsion. Add nano-silica, a cross-linking agent, and deionized water, and stir evenly to obtain the final microemulsion-type aqueous polyurethane-based cashmere anti-pilling finishing agent. (3) Uniformly coat the prepared finishing agent on the surface of the cashmere fabric.

5. The preparation method of the anti-pilling cashmere fabric according to claim 3, characterized in that, The organotin catalyst is dibutyltin dilaurate.

6. The preparation method of the anti-pilling cashmere fabric according to claim 3, characterized in that, In step (2), cool down to 40-50 °C.

7. The preparation method of the anti-pilling cashmere fabric according to claim 3, characterized in that, In step (2), adjust the pH value to 7.5-8.

5.

8. The preparation method of the anti-pilling cashmere fabric according to claim 4, characterized in that In step (1), the organic solvent added is acetone.

9. The preparation method of the anti-pilling cashmere fabric according to claim 4, characterized in that, In step (2), the operation of removing the organic solvent is vacuum distillation.

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