Preparation method of novel textile dyeing and finishing auxiliary pigment with amphoteric polymer

Abstract

This application relates to the field of textile dyeing and finishing auxiliaries technology, specifically disclosing a method for preparing a novel textile dyeing and finishing auxiliary pigment with an amphoteric polymer. The method includes the following steps: S1, preparing an amphoteric polymer prepolymer solution: mixing anionic vinyl monomers, cationic vinyl monomers, and a water-soluble initiator in water to obtain an amphoteric polymer prepolymer solution; S2, preparing a pigment predispersant solution: grinding an organic pigment and a dispersing and wetting agent in water to obtain a pigment predispersant solution; S3, graft polymerization: mixing the amphoteric polymer prepolymer solution and the pigment predispersant solution, adding a crosslinking monomer to obtain a pigment slurry grafted with an amphoteric polymer; S4, post-treatment: sequentially subjecting the pigment slurry to precipitation, filtration, and drying to obtain a novel textile dyeing and finishing auxiliary pigment with an amphoteric polymer. The preparation method of this application can be used in coating dyeing processes, offering the advantages of one-step integration of coloring and function, and a shortened process flow.

Description

Technical Field

[0001] This application relates to the field of textile dyeing and finishing auxiliaries technology, and more specifically, it relates to a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymers. Background Technology

[0002] Coating dyeing technology is widely used in the textile printing and dyeing industry due to its advantages such as short process, water and energy saving, and wide applicability to a wide variety of fibers. Existing coating dyeing technology usually implements pigment dispersion, binder film formation and functional finishing in separate steps. That is, pigment paste is first prepared by grinding, then compounded with binder for padding and coloring, and finally functional auxiliaries such as antistatic agents and easy-to-clean finishing agents are applied separately and cured at high temperature. Each step in this segmented process is independently controllable, which makes it easy to adjust parameters according to the processing object. Moreover, the selection and dosage optimization of each functional auxiliary agent are not constrained by other steps. Therefore, it has long been a common solution adopted in the industry.

[0003] However, the above-mentioned step-by-step process has the disadvantages of being lengthy and having high energy consumption; the dispersant used in the pigment dispersion stage no longer plays an active role after dyeing, but instead remains in the coating, weakening the adhesion of the adhesive to the fiber; the hydrophilic auxiliaries introduced in the functional finishing stage have limited compatibility with the adhesive system, and are difficult to form a uniform integrated structure with the film-forming substance during baking, resulting in low utilization of finishing agents and a stiff hand feel of the fabric; in addition, the multiple material transfers and intermediate stops between each step increase the risk of batch-to-batch quality fluctuations, making it difficult to stably achieve the synergistic effect of coloring and functional integration. Summary of the Invention

[0004] To address the problem of weakened adhesion of adhesives to fibers due to dispersant residue, this application provides a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer.

[0005] This application provides a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer, using the following technical solution: A method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymers includes the following steps: S1. The hydrophobic epoxy acrylate monomer, the first initiator and the first solvent are mixed and the first polymerization reaction is carried out under an inert atmosphere to obtain the core prepolymer solution. S2. Mix the tertiary amine ester monomer, quaternary ammonium salt cationic monomer, second initiator and second solvent, and add dropwise to the core prepolymer solution obtained in S1 to carry out the second polymerization reaction and obtain a bilayer core-shell prepolymer solution. S3. After dissolving the linear hydrophilic polymer, mix it with the bilayer core-shell prepolymer solution obtained in S2 and perform outer layer coating composite treatment to obtain an amphoteric polymer solution with a three-layer gradient core-shell structure. S4. The amphoteric polymer solution obtained in S3 is mixed with organic pigment, dispersant and deionized water, and then ground and dispersed to obtain amphoteric polymer-coated pigment paste. S5. Mix the pigment paste obtained in S4 with the binder and crosslinking agent evenly to obtain an amphoteric polymer textile dyeing and finishing auxiliary pigment preparation for coating dyeing.

[0006] By adopting the above technical solution, hydrophobic epoxy acrylate monomers are used as core building monomers to form a hydrophobic core prepolymer containing epoxy groups through the first polymerization reaction. In the subsequent coating dyeing and drying process, the core chemically bonds with the hydroxyl groups on the cotton fibers and the active groups in the adhesive, thereby anchoring the polymer molecules to the fiber surface and providing a chemical bonding basis for the wash fastness of the overall functional coating. Therefore, a durable and firm effect between the functional coating and the fiber matrix is ​​obtained.

[0007] Preferably, before step S1, the hydrophobic epoxy acrylate monomer is further subjected to purification pretreatment, wherein the purification pretreatment is as follows: the hydrophobic epoxy acrylate monomer is washed with alkaline solution to remove the polymerization inhibitor, then washed with deionized water until neutral, dried with a desiccant, and then purified by vacuum distillation. By adopting the above technical solution, the hydrophobic epoxy acrylate monomers are purified and pretreated by alkaline washing, water washing, drying and vacuum distillation before the polymerization reaction. This removes the polymerization inhibitors and trace impurities added to commercially available monomers to prevent self-polymerization. The presence of these impurities can interfere with the decomposition efficiency of the initiator and cause fluctuations in the polymerization rate. The purified monomers can ensure that the first polymerization reaction proceeds smoothly, thereby obtaining a core prepolymer with uniform molecular weight distribution and high batch stability.

[0008] Preferably, in step S1, the temperature of the first polymerization reaction is 65–80°C, and the reaction time is 3–6 hours; the hydrophobic epoxy acrylate monomer is at least one of glycidyl methacrylate, glycidyl acrylate ether, or allyl glycidyl ether; the first initiator is an azo or peroxide-based oil-soluble initiator, and the amount used is 0.5%–2% of the mass of the hydrophobic epoxy acrylate monomer; the first solvent is anhydrous ethanol or ethyl acetate. By adopting the above technical solution, glycidyl methacrylate, glycidyl acrylate, or allyl glycidyl ether are selected as the core monomers. These monomer molecules contain both polymeric double bonds and reactive epoxy groups. The double bonds participate in the first polymerization reaction to build the polymer backbone, while the epoxy groups on the side groups remain intact during the polymerization process and are reserved for cross-linking reactions with fibers and adhesives during subsequent high-temperature baking. This molecular structure design ensures that the core layer does not undergo side reactions with other components in the system during the polymerization stage, but only plays an anchoring role during the application stage, thereby achieving the effect of controlled process and precise anchoring timing.

[0009] Preferably, in step S2, the tertiary amine ester monomer is at least one of dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, or dimethylaminoethyl acrylate; the quaternary ammonium salt cationic monomer is methacryloyloxyethyltrimethylammonium chloride or acryloyloxyethyltrimethylammonium chloride; the molar ratio of the tertiary amine ester monomer to the quaternary ammonium salt cationic monomer is 8:1 to 20:1; the second initiator is an azo or peroxide-based oil-soluble initiator; the second solvent is an alcohol or ester organic solvent; and the mass ratio of the core prepolymer to the bilayer core-shell prepolymer is 1:(1.5~3). By adopting the above technical solution, tertiary amine ester monomers are selected as the main building blocks of the middle layer structure. These monomers contain hydrophobic tertiary amine ester side groups, which make the middle layer hydrophobic in the dry state, thereby protecting the core layer and maintaining good compatibility with the adhesive system during pigment dispersion and coating dyeing. At the same time, a small amount of quaternary ammonium salt cationic monomers are introduced for copolymerization, using their positive charge to provide ionic conductivity and electrostatic attraction sites for anionic substances in the middle layer. When the fabric comes into contact with the detergent containing anionic surfactants during washing, these quaternary ammonium salt sites first capture the anionic surfactant molecules and promote their penetration into the middle layer. Meanwhile, the detergent contains alkaline detergents to provide a weakly alkaline environment, and the tertiary amine ester hydrolyzes to generate carboxyl groups and neutralizes to carboxylates. At the same time, the tertiary amine matrix is ​​protonated and becomes positively charged, forming a hydrophilic network together, improving the stain-removing performance, thereby providing triggering conditions for the subsequent hydrolysis and transformation of the tertiary amine ester, and obtaining the molecular switch effect of washing activation function.

[0010] Preferably, in step S2, the temperature of the second polymerization reaction is 70-85°C, the dropping time is 1-2 hours, and the reaction is continued at the temperature for 2-4 hours after the dropping is completed; the number average molecular weight of the obtained bilayer core-shell prepolymer is controlled in the range of 8000-25000 g / mol. By adopting the above technical solution, the mixed solution of tertiary amine ester monomer and quaternary ammonium salt cationic monomer is added dropwise to the core prepolymer solution, so that the second monomer mixture undergoes an orderly chain growth reaction on the surface of the already formed core particles, rather than forming homopolymer particles independently. This constructs a core-shell structure with a hydrophobic epoxy polymer core and a middle layer of copolymer containing tertiary amine ester and quaternary ammonium salt groups. At the same time, by controlling the number average molecular weight range, the polymer has suitable flowability and coating ability on the pigment surface during the grinding and dispersion stage, and can form a dense network structure during crosslinking and curing. Thus, a bilayer core-shell prepolymer with a well-defined structure and controlled performance is obtained.

[0011] Preferably, in step S3, the linear hydrophilic polymer is at least one of polyvinyl alcohol, poly(N-vinylpyrrolidone), or polyethylene glycol monomethyl ether; the amount of the linear hydrophilic polymer is 3% to 10% of the mass of the bilayer core-shell prepolymer obtained in step S2; the temperature of the outer coating composite treatment is 75 to 90°C, and the reaction time is 1 to 3 hours; the linear hydrophilic polymer is a saturated polymer, which is bonded to the bilayer core-shell prepolymer through physical coating and intermolecular hydrogen bonding. By adopting the above technical solution, since the linear hydrophilic polymers are all saturated polymers and have no polymerizable double bonds, they cannot undergo chemical grafting polymerization with the double-layer core-shell prepolymer. Instead, the outer layer is coated through physical coating and hydrogen bonding with the hydroxyl and ester groups on the surface of the prepolymer. In order to improve the interfacial bonding strength, an azobisisobutyronitrile initiator can also be added to promote the generation of free radicals on the surface of the prepolymer, enhance the physical bonding strength, and prevent the outer layer from falling off during subsequent grinding or washing.

[0012] Preferably, in step S4, the organic pigment is at least one of phthalocyanine blue, phthalocyanine green, pigment red 122, pigment yellow 14, or pigment violet 23; the mass ratio of the solid content of the amphoteric polymer solution to the organic pigment is 1:5 to 1:20. By adopting the above technical solution, since the amphoteric polymer solution with a three-layer gradient core-shell structure is involved in the grinding and dispersion process of organic pigments, the hydrophobic middle layer of the polymer molecules generates affinity adsorption with the hydrophobic region of the pigment surface, while the cationic quaternary ammonium salt groups form electrostatic anchoring with the negatively charged sites on the pigment surface. This allows the polymer molecules to coat the pigment particle surface in an oriented manner with the middle layer attached and the core facing outward. This coating structure forms a steric hindrance layer and an electrostatic repulsion layer between the pigment particles, preventing the pigment particles from agglomerating during storage. At the same time, the polymer coating layer is a component of the functional coating during subsequent paint dyeing. Therefore, the technical effect of combining the roles of pigment dispersant and functional finishing agent is achieved.

[0013] Preferably, in step S4, the grinding and dispersing treatment is carried out by sand milling or ball milling, the grinding time is 2 to 8 hours, and the average particle size of the pigment particles in the obtained pigment paste is controlled in the range of 100 to 500 nm. By adopting the above technical solution, the particle size of pigment particles is reduced to the submicron level through mechanical grinding. The smaller particle size increases the specific surface area of ​​the pigment particles, allowing more polymer molecules to participate in the coating and form a uniform coating layer. At the same time, the submicron particle size is conducive to maintaining good suspension stability of pigment particles in the coating dyeing working solution, reducing uneven dyeing caused by particle sedimentation. In addition, the fine and uniform particle size makes it easier for pigment particles to penetrate into the fiber bundle and yarn gaps, resulting in a uniform coloring effect and a high color yield in the pad dyeing process.

[0014] Preferably, in step S4, a wetting agent and an antifoaming agent are also added. The wetting agent is a polyether-modified organosiloxane, and the amount used is 0.5% to 2% of the pigment mass. The antifoaming agent is a mineral oil-based antifoaming agent, and the amount used is 0.1% to 0.5% of the total pigment paste mass. By adopting the above technical solution, the addition of polyether-modified organosiloxane wetting agent during the grinding and dispersion stage reduces the surface tension of the aqueous system, promotes the penetration and wetting of water molecules into the pigment aggregates, thereby accelerating the deagglomeration process of pigment particles and shortening the grinding time required to reach the target particle size. At the same time, the added mineral oil defoamer can suppress the large amount of foam generated during the grinding process due to high-speed shear and the presence of wetting agent. The elimination of foam ensures the effectiveness of energy transfer between the grinding media and the material, and avoids the problem of decreased grinding efficiency and pigment paste foaming and overflow caused by cavitation.

[0015] Preferably, in step S5, the adhesive is a water-based polyurethane adhesive or a polyacrylate adhesive, and the amount used is 10% to 30% of the pigment paste mass; the crosslinking agent is a blocked isocyanate crosslinking agent, and the amount used is 3% to 8% of the adhesive mass. By adopting the above technical solution, since a closed isocyanate crosslinking agent is used in combination with a water-based adhesive, the crosslinking agent is in a closed state and does not participate in the reaction during the preparation and padding stages of the coating dyeing working solution, ensuring the applicability and process stability of the working solution. When the fabric is padded, dried and enters the high-temperature baking stage, the closed groups dissociate under heat and release free isocyanate groups. These active groups react simultaneously with the epoxy groups on the side chains of the core prepolymer, the hydroxyl and carboxyl groups in the adhesive molecules and the hydroxyl groups on the surface of the cotton fibers, forming a three-dimensional interpenetrating network structure connected by chemical bonds on the fiber surface. This network locks the pigment particles in it, and the tertiary amine ester groups contained in the middle layer are also covalently anchored in the network, giving the functional layer generated by washing activation a durable water-resistant finish.

[0016] In summary, this application has the following beneficial effects: 1. Since this application uses hydrophobic epoxy acrylate monomers to construct the core prepolymer and sequentially coats the middle layer containing tertiary amine ester and the outer layer of linear hydrophilic polymer to form a three-layer gradient core-shell structure of amphoteric polymer, the polymer simultaneously plays multiple roles in pigment dispersion, film adhesion and easy care finishing during the coating dyeing process. Therefore, it achieves the effect of coloring and functional integration in one step and shortening the process flow.

[0017] 2. In this application, a middle layer structure is preferably constructed by copolymerizing tertiary amine ester monomers and quaternary ammonium salt cationic monomers, and a sacrificial hydrophilic layer that can be removed by the first wash is set on the outer layer. During washing, the anionic surfactant is captured by the quaternary ammonium salt sites and penetrates into the middle layer. The washing liquid contains alkaline detergent to provide a weakly alkaline environment. The tertiary amine ester is hydrolyzed to generate carboxyl groups and neutralized to carboxylates. At the same time, the tertiary amine matrix is ​​protonated and becomes positively charged, forming a hydrophilic network together, which improves the easy-to-clean performance. This transforms the daily washing behavior into a trigger condition for activating and regenerating the easy-to-clean function of the fabric. Therefore, the effect of improved functional wash resistance and self-repair ability is obtained.

[0018] 3. The method of this application involves directly participating an amphoteric polymer with a three-layer gradient core-shell structure in the pigment grinding and dispersion process. The hydrophobic middle layer of the polymer generates affinity adsorption with the pigment surface, while the cationic groups provide electrostatic anchoring, forming a stable coating layer on the surface of the pigment particles. This coating layer plays a dual dispersing role of steric hindrance and electrostatic repulsion during the grinding stage, and directly constitutes the main component of the functional coating during subsequent paint dyeing. Therefore, the pigment dispersant and functional finishing agent are combined into one, avoiding mutual interference between materials in multi-step processing.

[0019] 4. The method of this application uses a blocked isocyanate crosslinking agent in combination with the core epoxy group. During the padding and drying stages, the crosslinking agent remains inert to ensure the stability of the working solution. During the high-temperature baking stage, the crosslinking agent is unblocked and undergoes a crosslinking reaction simultaneously with the core epoxy group, the active group of the adhesive, and the hydroxyl groups of the cotton fiber. A three-dimensional interpenetrating network with chemical bonds is constructed on the fiber surface. This network covalently locks the pigment particles and the middle layer functional components to the fiber surface. Therefore, the fabric color fastness and easy stain removal function can be synergistically maintained after multiple washes. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymers, as proposed in this application. Figure 2 This is a schematic diagram showing the test results of the water-washable and easily decontaminated performance of the embodiments and comparative examples in this application; Figure 3This is a schematic diagram showing the test results of the self-healing performance of the embodiments and comparative examples in this application; Figure 4 This is a schematic diagram showing the test results of the initial color fastness performance of the embodiments and comparative examples in this application. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Technical concept: This application discloses a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer. The method includes the following steps: S1, preparing an amphoteric polymer prepolymer solution: mixing anionic vinyl monomers, cationic vinyl monomers, and a water-soluble initiator in water, and obtaining an amphoteric polymer prepolymer solution after a prepolymerization reaction; S2, preparing a pigment predispersant solution: grinding an organic pigment and a dispersing and wetting agent in water to obtain a pigment predispersant solution; S3, graft polymerization: mixing the amphoteric polymer prepolymer solution and the pigment predispersant solution, adding a crosslinking monomer, and obtaining a pigment slurry grafted with the amphoteric polymer after a polymerization reaction; S4, post-treatment: sequentially subjecting the pigment slurry to precipitation, filtration, and drying to obtain a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer.

[0023] This application uses hydrophobic epoxy acrylate monomers to construct a core prepolymer, and then sequentially coats it with a middle layer containing tertiary amine ester and an outer layer of linear hydrophilic polymer to form a three-layer gradient core-shell structure of amphoteric polymer. In the process of paint dyeing, this polymer simultaneously plays multiple roles of pigment dispersion, film adhesion and easy-care finishing, thus achieving the effect of coloring and functional integration in one step and shortening the process flow.

[0024] Example 1: This example provides a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer, comprising the following steps: S1. The hydrophobic epoxy acrylate monomer, the first initiator and the first solvent are mixed and the first polymerization reaction is carried out under an inert atmosphere to obtain the core prepolymer solution.

[0025] Before step S1, the process includes a purification pretreatment of the hydrophobic epoxy acrylate monomer. The purification pretreatment involves washing the hydrophobic epoxy acrylate monomer with an alkaline solution to remove the polymerization inhibitor, then washing it with deionized water until neutral, drying it with a desiccant, and then purifying it by vacuum distillation.

[0026] In step S1, the temperature of the first polymerization reaction is 65°C and the reaction time is 6 hours; the hydrophobic epoxy acrylate monomer is glycidyl methacrylate; the first initiator is an azo dye, and the amount used is 0.5% of the mass of the hydrophobic epoxy acrylate monomer; the first solvent is anhydrous ethanol.

[0027] S2. The tertiary amine ester monomer, quaternary ammonium salt cationic monomer, second initiator and second solvent are mixed and added dropwise to the core prepolymer solution obtained in S1 to carry out the second polymerization reaction and obtain a bilayer core-shell prepolymer solution.

[0028] In step S2, the tertiary amine ester monomer is dimethylaminoethyl methacrylate; the quaternary ammonium salt cationic monomer is methacryloyloxyethyltrimethylammonium chloride; the molar ratio of the tertiary amine ester monomer to the quaternary ammonium salt cationic monomer is 8:1; the second initiator is an azo compound; the second solvent is an alcoholic organic solvent; and the mass ratio of the core prepolymer to the bilayer core-shell prepolymer is 1:1.5.

[0029] In step S2, the temperature of the second polymerization reaction is 70°C, the dropping time is 2 hours, and the reaction is continued at the temperature for 4 hours after the dropping is completed; the number average molecular weight of the obtained bilayer core-shell prepolymer is controlled in the range of 8000 g / mol.

[0030] S3. After dissolving the linear hydrophilic polymer, mix it with the bilayer core-shell prepolymer solution obtained in S2 and perform outer layer coating composite treatment to obtain an amphoteric polymer solution with a three-layer gradient core-shell structure.

[0031] In step S3, the linear hydrophilic polymer is polyvinyl alcohol; the amount of linear hydrophilic polymer is 3% of the mass of the bilayer core-shell prepolymer obtained in step S2; the temperature of the outer coating composite treatment is 75°C and the reaction time is 3 hours; the linear hydrophilic polymer is a saturated polymer, which is combined with the bilayer core-shell prepolymer through physical coating and intermolecular hydrogen bonding.

[0032] S4. The amphoteric polymer solution obtained in S3 is mixed with organic pigment, dispersant and deionized water, and then ground and dispersed to obtain amphoteric polymer-coated pigment paste.

[0033] In step S4, the organic pigment is phthalocyanine blue; the mass ratio of the solid content of the amphoteric polymer solution to the organic pigment is 1:5.

[0034] In step S4, the grinding and dispersion process uses sand milling for 8 hours, and the average particle size of the pigment particles in the resulting pigment paste is controlled within the range of 100 nm.

[0035] In step S4, a wetting agent and an antifoaming agent are added. The wetting agent is a polyether-modified organosiloxane, and the amount used is 2% of the pigment mass. The antifoaming agent is a mineral oil-based antifoaming agent, and the amount used is 0.5% of the total pigment paste mass.

[0036] S5. Mix the pigment paste obtained in S4 with the binder and crosslinking agent evenly to obtain an amphoteric polymer textile dyeing and finishing auxiliary pigment preparation for coating dyeing.

[0037] In step S5, the adhesive is a water-based polyurethane adhesive, and the amount used is 30% of the pigment paste mass; the crosslinking agent is a blocked isocyanate crosslinking agent, and the amount used is 8% of the adhesive mass.

[0038] Example 2: This example provides a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer, comprising the following steps: S1. The hydrophobic epoxy acrylate monomer, the first initiator and the first solvent are mixed and the first polymerization reaction is carried out under an inert atmosphere to obtain the core prepolymer solution.

[0039] Before step S1, the process includes a purification pretreatment of the hydrophobic epoxy acrylate monomer. The purification pretreatment involves washing the hydrophobic epoxy acrylate monomer with an alkaline solution to remove the polymerization inhibitor, then washing it with deionized water until neutral, drying it with a desiccant, and then purifying it by vacuum distillation.

[0040] In step S1, the temperature of the first polymerization reaction is 72.5°C and the reaction time is 4.5 hours; the hydrophobic epoxy acrylate monomer is glycidyl acrylate; the first initiator is a peroxide-based oil-soluble initiator, and the amount used is 1% of the mass of the hydrophobic epoxy acrylate monomer; the first solvent is ethyl acetate.

[0041] S2. The tertiary amine ester monomer, quaternary ammonium salt cationic monomer, second initiator and second solvent are mixed and added dropwise to the core prepolymer solution obtained in S1 to carry out the second polymerization reaction and obtain a bilayer core-shell prepolymer solution.

[0042] In step S2, the tertiary amine ester monomer is diethylaminoethyl methacrylate; the quaternary ammonium salt cationic monomer is acryloyloxyethyltrimethylammonium chloride; and the molar ratio of the tertiary amine ester monomer to the quaternary ammonium salt cationic monomer is 14:1.

[0043] In step S2, the temperature of the second polymerization reaction is 77.5℃, the dropping time is 1.5 hours, and the reaction is continued at this temperature for 3 hours after the dropping is completed; the number average molecular weight of the resulting bilayer core-shell prepolymer is controlled within the range of 16500 g / mol; the second initiator is a peroxide-based oil-soluble initiator; the second solvent is an ester-based organic solvent; and the mass ratio of the core prepolymer to the bilayer core-shell prepolymer is 1:2.

[0044] S3. After dissolving the linear hydrophilic polymer, mix it with the bilayer core-shell prepolymer solution obtained in S2 and perform outer layer coating composite treatment to obtain an amphoteric polymer solution with a three-layer gradient core-shell structure.

[0045] In step S3, the linear hydrophilic polymer is poly(N-vinylpyrrolidone); the amount of linear hydrophilic polymer is 6.5% of the mass of the bilayer core-shell prepolymer obtained in step S2; the temperature of the outer coating composite treatment is 82.5℃ and the reaction time is 2 hours; the linear hydrophilic polymer is a saturated polymer, which is combined with the bilayer core-shell prepolymer through physical coating and intermolecular hydrogen bonding.

[0046] S4. The amphoteric polymer solution obtained in S3 is mixed with organic pigment, dispersant and deionized water, and then ground and dispersed to obtain amphoteric polymer-coated pigment paste.

[0047] In step S4, the organic pigment is Pigment Red 122; the mass ratio of the solid content of the amphoteric polymer solution to the organic pigment is 1:12.5.

[0048] In step S4, the grinding and dispersion process uses ball milling for 5 hours, and the average particle size of the pigment particles in the resulting pigment paste is controlled within the range of 300 nm.

[0049] In step S4, a wetting agent and an antifoaming agent are added. The wetting agent is a polyether-modified organosiloxane, and the amount used is 1.25% of the pigment mass. The antifoaming agent is a mineral oil-based antifoaming agent, and the amount used is 0.3% of the total pigment paste mass.

[0050] S5. Mix the pigment paste obtained in S4 with the binder and crosslinking agent evenly to obtain an amphoteric polymer textile dyeing and finishing auxiliary pigment preparation for coating dyeing.

[0051] In step S5, the adhesive is a polyacrylate adhesive, and the amount used is 20% of the pigment paste mass; the crosslinking agent is a blocked isocyanate crosslinking agent, and the amount used is 5.5% of the adhesive mass.

[0052] Example 3: This example provides a method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer, comprising the following steps: S1. The hydrophobic epoxy acrylate monomer, the first initiator and the first solvent are mixed and the first polymerization reaction is carried out under an inert atmosphere to obtain the core prepolymer solution.

[0053] Before step S1, the process includes a purification pretreatment of the hydrophobic epoxy acrylate monomer. The purification pretreatment involves washing the hydrophobic epoxy acrylate monomer with an alkaline solution to remove the polymerization inhibitor, then washing it with deionized water until neutral, drying it with a desiccant, and then purifying it by vacuum distillation.

[0054] In step S1, the temperature of the first polymerization reaction is 80°C and the reaction time is 3 hours; the hydrophobic epoxy acrylate monomer is allyl glycidyl ether; the first initiator is a peroxide-based oil-soluble initiator, and the amount used is 2% of the mass of the hydrophobic epoxy acrylate monomer; the first solvent is ethyl acetate.

[0055] S2. The tertiary amine ester monomer, quaternary ammonium salt cationic monomer, second initiator and second solvent are mixed and added dropwise to the core prepolymer solution obtained in S1 to carry out the second polymerization reaction and obtain a bilayer core-shell prepolymer solution.

[0056] In step S2, the tertiary amine ester monomer is dimethylaminoethyl acrylate; the quaternary ammonium salt cationic monomer is methacryloyloxyethyltrimethylammonium chloride; the molar ratio of the tertiary amine ester monomer to the quaternary ammonium salt cationic monomer is 20:1; the second initiator is a peroxide-based oil-soluble initiator; the second solvent is an ester-based organic solvent; and the mass ratio of the core prepolymer to the bilayer core-shell prepolymer is 1:3.

[0057] In step S2, the temperature of the second polymerization reaction is 85°C, the dropping time is 1 hour, and the reaction is continued at the temperature for 2 hours after the dropping is completed; the number average molecular weight of the obtained bilayer core-shell prepolymer is controlled in the range of 25000 g / mol.

[0058] S3. After dissolving the linear hydrophilic polymer, mix it with the bilayer core-shell prepolymer solution obtained in S2 and perform outer layer coating composite treatment to obtain an amphoteric polymer solution with a three-layer gradient core-shell structure.

[0059] In step S3, the linear hydrophilic polymer is polyethylene glycol monomethyl ether; the amount of linear hydrophilic polymer is 10% of the mass of the bilayer core-shell prepolymer obtained in step S2; the temperature of the outer coating composite treatment is 90℃ and the reaction time is 1 hour; the linear hydrophilic polymer is a saturated polymer, which is combined with the bilayer core-shell prepolymer through physical coating and intermolecular hydrogen bonding.

[0060] S4. The amphoteric polymer solution obtained in S3 is mixed with organic pigment, dispersant and deionized water, and then ground and dispersed to obtain amphoteric polymer-coated pigment paste.

[0061] In step S4, the organic pigment is Pigment Violet 23; the mass ratio of the solid content of the amphoteric polymer solution to the organic pigment is 1:20.

[0062] In step S4, the grinding and dispersion process uses sand milling for 2 hours, and the average particle size of the pigment particles in the resulting pigment paste is controlled within the range of 500 nm.

[0063] In step S4, a wetting agent and an antifoaming agent are added. The wetting agent is a polyether-modified organosiloxane, and the amount used is 0.5% of the pigment mass. The antifoaming agent is a mineral oil-based antifoaming agent, and the amount used is 0.1% of the total pigment paste mass.

[0064] S5. Mix the pigment paste obtained in S4 with the binder and crosslinking agent evenly to obtain an amphoteric polymer textile dyeing and finishing auxiliary pigment preparation for coating dyeing.

[0065] In step S5, the adhesive is a water-based polyurethane adhesive, and the amount used is 10% of the pigment paste mass; the crosslinking agent is a blocked isocyanate crosslinking agent, and the amount used is 3% of the adhesive mass.

[0066] Comparative Example 1: This comparative example refers to the content of Example 1, except that in step S1, the hydrophobic epoxy acrylate monomer is replaced with methyl methacrylate without epoxy groups, and the rest is the same as in Example 1.

[0067] Comparative Example 2: This comparative example is the same as that in Example 1, except that in step S2, the tertiary amine ester monomer is replaced with butyl methacrylate which does not contain a tertiary amine group. The rest of the contents are the same as those in Example 1.

[0068] Comparative Example 3: This comparative example refers to the content of Example 1, except that step S3 is omitted, that is, a linear hydrophilic polymer outer layer is not introduced on the surface of the double core-shell prepolymer. The rest of the content is the same as Example 1.

[0069] Comparative Example 4: This comparative example refers to the content of Example 1, except that in step S2, no quaternary ammonium salt cationic monomer is added, that is, the middle layer is polymerized only from tertiary amine ester monomer. The rest of the content is the same as that of Example 1.

[0070] Comparative Example 5: This comparative example refers to the content of Example 1, except that in step S4, the amphoteric polymer solution obtained in S3 is not included in the grinding and dispersion treatment. Instead, the amphoteric polymer solution is added to the pigment paste separately after grinding and mixed. The rest of the content is the same as in Example 1.

[0071] Comparative Example 6: This comparative example refers to the content of Example 1, except that in step S5, the blocked isocyanate crosslinking agent is replaced with a non-blocked toluene diisocyanate crosslinking agent. The rest of the content is the same as in Example 1. The non-blocked toluene diisocyanate reacts rapidly with water in the aqueous working solution and is mostly deactivated within half an hour. The effective utilization rate of crosslinking is less than 30%, so the final coating has low crosslinking density and obvious performance degradation.

[0072] Comparative Example 7: Preparation of pigment-dyed fabrics using a conventional two-step process: Phthalocyanine blue paste was prepared using a commercially available conventional dispersant, sodium lignosulfonate. A commercially available fluorinated polyacrylate easy-to-clean finishing agent was added at 20% of the pigment mass, and then mixed with a water-based polyurethane adhesive. The remaining padding, drying, and baking processes were the same as in Example 1. This process requires separate steps for pigment dispersion and functional finishing agent compounding, and the process is longer than the one-step process of this application.

[0073] Performance testing Sample preparation: The textile dyeing and finishing auxiliary pigment preparations obtained in Examples 1 to 3 and Comparative Examples 1 to 6 were respectively formulated into coating dyeing working solutions. The mass concentration of the pigment preparation in the working solution was 80 g / L. Pure cotton woven plain weave fabric was used as the substrate and subjected to a two-dip two-ply process for padding treatment. The padding rate was 70%. The padded fabric was dried at 80°C for 3 min and then baked at 150°C for 3 min. The baked fabric was equilibrated under standard atmospheric conditions for 24 h to obtain the coating dyed fabric samples corresponding to each example and comparative example. Another piece of untreated pure cotton fabric was taken as a blank control sample.

[0074] Stain-removing performance test: The stain-removing performance was tested according to FZ / T 01118-2012 standard, and the rating was based on the stain-removing grade assessment method in AATCC 130-2016 standard. The fabric samples obtained from Examples 1 to 3 and Comparative Examples 1 to 6, as well as the blank control samples, were laid flat on the test platform. 0.1 mL of liquid paraffin was used as the oil stain source, and the oil stain was dripped freely from a height of 5 cm onto the fabric surface. After the oil stain dripped, it was allowed to stand for 30 seconds to allow it to penetrate naturally. Then, the contaminated fabric sample was placed in an aqueous solution containing 2 g / L of standard detergent at 40°C, and tested in a wash fastness tester at a speed of 40 r / min. The sample was stirred and washed for 12 minutes. After washing, the sample was rinsed with running water for 1 minute and air-dried. Then, it was placed in a standard light source color matching box and visually evaluated by three professional rating personnel according to the AATCC 130 staining grade assessment standard. The grade ranged from grade 1, the worst, to grade 5, the best. This test was conducted in the laboratory under the condition of small-scale standard sample testing and precise temperature and time control. The obtained staining grade is the laboratory's optimal value. Industrial mass production batches are affected by factors such as fabric uniformity, process fluctuations of large-scale production equipment, and batch dispersion uniformity.

[0075] Washability and stain-removing performance testing: Multiple household washing simulations were conducted according to procedure 4A in GB / T 8629-2017. The washing program adopted standard washing conditions for cotton fabrics, and ECE phosphorus-containing standard detergent was selected. The fabric samples obtained in Examples 1 to 3 and Comparative Examples 1 to 6 were placed in a household washing machine, and standard detergent was added at a dosage of 1.5 g / L. The standard washing program for cotton fabrics was selected, which includes the entire process of washing, rinsing, and dehydration. Each complete washing program was considered as one washing cycle. After accumulating 10, 30, and 50 washing cycles, the samples were taken out and air-dried. The stain removal level after each washing cycle was determined according to the stain removal performance testing procedure in section 2 above, and the trend of stain removal level with the number of washing cycles was recorded.

[0076] Washing self-healing performance test: This test is a test procedure specifically for this application, used to verify the washing self-healing ability of the fabric; the fabric samples obtained in Examples 1 to 3 and Comparative Examples 1 to 6 were first subjected to a total of 30 washing cycles according to the washing cycle test procedure in Section 3 above. After being taken out and dried, their stain removal level was measured as the baseline value before self-healing; then the above samples after 30 washes were placed in a dry and ventilated environment and left to stand naturally for 7 days, and the stain removal level after standing was measured as the natural recovery reference value; another batch of samples after 30 washes were taken and subjected to a standard washing procedure again. After washing and drying, their stain removal level was measured as the recovery value after washing activation. The stain removal level after washing activation was compared with the baseline value to evaluate the washing self-healing ability of the fabric's easy stain removal function.

[0077] Pigment dispersion stability test: 50 mL of the pigment pastes prepared in step S4 of Examples 1 to 3 and Comparative Examples 1 to 6 were respectively placed into graduated stoppered cylinders, sealed, and left to stand at a constant temperature of 25°C for 30 days. During the standing period, the sedimentation and stratification of the pigment pastes in the cylinders were observed and recorded every 5 days. The percentage of the height of the upper precipitated clear liquid to the total height of the pigment paste was measured as the sedimentation rate. After the standing period, the unsettled pigment paste portion at the bottom of the cylinder was taken, and the average particle size of the pigment particles was measured using a laser particle size analyzer according to GB / T 19077-2016 standard. The average particle size was compared with the original particle size, and the particle size growth rate was calculated as an indicator for evaluating the dispersion stability of the pigment. The sedimentation rate and particle size growth rate data in this test are the optimal values ​​measured under laboratory conditions of small volume samples and constant temperature and undisturbed standing. After industrial scale-up production, the results are affected by factors such as increased batch volume, storage temperature fluctuations, mechanical disturbances during transportation and transfer, and widening of particle size distribution in industrial sand milling.

[0078] Color fastness performance testing: The color fastness to rubbing was tested according to GB / T 3920-2008 standard. Fabric samples obtained in Examples 1 to 3 and Comparative Examples 1 to 6 were cut into strips 20 cm long and 5 cm wide. Using a color fastness to rubbing tester, the sample surface was rubbed 10 times with a vertical pressure of 9 N using standard dry rubbing cloth and standard wet rubbing cloth, with a rubbing stroke of 10 cm. After rubbing, the rubbing cloth was placed in a standard light source color matching box, and the staining grade for dry and wet rubbing was assessed using the grey scale for staining assessment in GB / T 251-2008. Additionally, the color fastness to washing was tested according to the soaping method in GB / T 3921-2008 standard. The fabric sample was sewn to a standard multifiber lining and then placed in a soap solution containing 5 g / L soap flakes. The solution was treated at 40°C for 30 minutes. After washing and drying, the color change grade of the sample and the staining grade of the lining fabric were assessed.

[0079] Colorfastness retention performance test after multiple washes: The fabric samples obtained in Examples 1 to 3 and Comparative Examples 1 to 6 were subjected to a total of 30 washing cycles according to the washing cycle test procedure in Section 3 above. After drying, the colorfastness to dry rubbing, colorfastness to wet rubbing, and colorfastness to soap washing were measured according to the colorfastness performance test procedure in Section 6 above. The colorfastness grades after 30 washes were compared with the initial colorfastness grades, the colorfastness retention rate was calculated, and the degree of influence of multiple washes on the colorfastness of the fabric was evaluated.

[0080] Table 1: Initial detergency and pigment dispersion stability Example 1 4.5 3.2 5.8 Example 2 4.3 4.1 7.2 Example 3 4.0 5.8 9.4 Comparative Example 1 3.8 4.5 8.3 Comparative Example 2 3.0 4.9 9.1 Comparative Example 3 4.2 3.8 7.0 Comparative Example 4 3.5 4.6 8.7 Comparative Example 5 3.8 18.7 35.4 Comparative Example 6 4.4 3.5 6.5 Comparative Example 7 3.2 12.5 22.6 Blank control sample 1.0 — — Table 2: Water washability and easy stain removal performance Example 1 4.7 4.8 4.6 Example 2 4.5 4.7 4.4 Example 3 4.2 4.5 4.1 Comparative Example 1 3.0 2.2 1.5 Comparative Example 2 2.5 1.8 1.0 Comparative Example 3 3.5 2.5 1.8 Comparative Example 4 3.2 2.0 1.3 Comparative Example 5 3.0 2.3 1.6 Comparative Example 6 4.0 3.2 2.5 Comparative Example 7 2.8 1.9 1.2 Blank control sample 1.0 1.0 1.0 Table 3: Washing Self-Healing Performance Example 1 4.8 4.9 5.0 Example 2 4.7 4.7 4.8 Example 3 4.5 4.5 4.7 Comparative Example 1 2.2 2.3 2.3 Comparative Example 2 1.8 1.9 1.9 Comparative Example 3 2.5 2.6 2.6 Comparative Example 4 2.0 2.1 2.2 Comparative Example 5 2.3 2.4 2.4 Comparative Example 6 3.2 3.3 3.4 Comparative Example 7 1.9 2.0 2.0 Blank control sample 1.0 1.0 1.0 Table 4: Initial color fastness performance Example 1 4.5 4.0 4.5 4.5 Example 2 4.3 3.8 4.3 4.3 Example 3 4.0 3.5 4.0 4.0 Comparative Example 1 3.0 2.5 3.0 3.0 Comparative Example 2 3.5 3.0 3.5 3.5 Comparative Example 3 4.2 3.8 4.2 4.2 Comparative Example 4 3.8 3.2 3.8 3.8 Comparative Example 5 4.0 3.5 4.0 4.0 Comparative Example 6 3.2 2.8 3.2 3.2 Comparative Example 7 3.2 2.6 3.2 3.2 Table 5: Color fastness retention performance after 30 washes Example 1 4.3 3.8 4.3 4.3 Example 2 4.1 3.6 4.1 4.1 Example 3 3.8 3.3 3.8 3.8 Comparative Example 1 2.0 1.5 2.0 2.0 Comparative Example 2 2.5 2.0 2.5 2.5 Comparative Example 3 3.5 3.0 3.5 3.5 Comparative Example 4 3.0 2.5 3.0 3.0 Comparative Example 5 3.2 2.8 3.2 3.2 Comparative Example 6 2.2 1.8 2.2 2.2 Comparative Example 7 2.1 1.6 2.1 2.1 Example Conclusion: As can be seen from Examples 1 to 3 and Comparative Example 1, and Tables 4 and 5, when the core monomer lacks epoxy groups, the polymer cannot form chemical bonds with the fiber and adhesive during the high-temperature baking stage. The bonding force between the coating and the fiber substrate is maintained only by physical adsorption. After multiple washes, the coating is peeled off and lost as a whole, resulting in a simultaneous decrease in the color fastness and functional durability of the fabric. This indicates that the covalent anchoring effect provided by the core epoxy groups is a prerequisite for achieving the synergistic and durable maintenance of color fastness and easy stain removal function.

[0081] Based on Examples 1 to 3 and Comparative Example 2, and in conjunction with Tables 1 and 2, it can be seen that when the middle layer structure lacks tertiary amine ester groups, the polymer cannot undergo in-situ hydrolysis transformation induced by anionic surfactants during the washing process. The middle layer always maintains hydrophobic properties and cannot generate a hydrophilic carboxylate network. The easy-to-clean function continues to decay after multiple washes without any signs of recovery. This confirms that the tertiary amine ester groups in the middle layer are the core function for realizing the washing activation function transformation and long-lasting hydrophilic regeneration ability.

[0082] Based on Examples 1 to 3 and Comparative Example 3, and in conjunction with Tables 1 and 2, it can be seen that when the polymer surface lacks a linear hydrophilic polymer outer layer, the fabric lacks perceptible hydrophilic function during the initial use stage. However, during washing, the middle layer is directly exposed to the washing liquid and can still partially activate the functional conversion, but its activation efficiency is lower than that of the polymer system with a sacrificial outer layer that is fully covered. This indicates that the sacrificial outer layer provides an immediate hydrophilic effect at the delivery stage while also playing a dual role in protecting the integrity of the middle layer and regulating the timing of functional release.

[0083] Based on Examples 1 to 3 and Comparative Example 4, and in conjunction with Tables 1, 2, and 3, it can be seen that when the quaternary ammonium salt cationic monomer is missing in the middle layer structure, the anionic surfactant molecules in the washing liquid cannot be effectively captured and enriched in the middle layer. The hydrolysis and transformation of the tertiary amine ester group is significantly less efficient due to the lack of necessary catalytic induction conditions. The washing activation effect is weak and the self-repair ability is almost lost. This indicates that the quaternary ammonium salt cationic site in the middle layer plays a molecular switch role in capturing anionic surfactants and promoting their penetration into the middle layer to trigger subsequent hydrolysis and transformation.

[0084] As can be seen from Examples 1 to 3 and Comparative Example 5, and Table 1, when the amphoteric polymer solution is added separately after pigment grinding rather than directly participating in the grinding and dispersion process, the polymer cannot form affinity adsorption and electrostatic anchoring with the surface at the critical moment of pigment particle deagglomeration and new surface exposure. The pigment particles rapidly aggregate due to the lack of steric hindrance protection from the polymer coating layer, and the sedimentation rate and particle size increase of the pigment paste are aggravated. This confirms that the participation of the polymer in the grinding and dispersion process is necessary to realize the role of pigment dispersant and functional finishing agent and to ensure the long-term storage stability of the pigment paste.

[0085] As can be seen from Examples 1 to 3 and Comparative Example 6, and Tables 4 and 5, when the crosslinking agent adopts a non-closed structure, the isocyanate groups begin to react with water and adhesives during the padding stage. This shortens the working solution's pot life and reduces the effective utilization rate of crosslinking, resulting in insufficient density and integrity of the three-dimensional interpenetrating network formed during the baking stage. Pigment particles and intermediate functional components cannot be fully locked onto the fiber surface, and the initial color fastness of the fabric is already at a low level, which further deteriorates after washing. This indicates that closed crosslinking agents play a role in ensuring process stability and constructing a complete and durable functional coating.

[0086] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer, characterized in that, Includes the following steps: S1. The hydrophobic epoxy acrylate monomer, the first initiator and the first solvent are mixed and the first polymerization reaction is carried out under an inert atmosphere to obtain the core prepolymer solution. S2. Mix the tertiary amine ester monomer, quaternary ammonium salt cationic monomer, second initiator and second solvent, and add dropwise to the core prepolymer solution obtained in S1 to carry out the second polymerization reaction and obtain a bilayer core-shell prepolymer solution. S3. After dissolving the linear hydrophilic polymer, mix it with the bilayer core-shell prepolymer solution obtained in S2 and perform outer layer coating composite treatment to obtain an amphoteric polymer solution with a three-layer gradient core-shell structure. S4. The amphoteric polymer solution obtained in S3 is mixed with organic pigment, dispersant and deionized water, and then ground and dispersed to obtain amphoteric polymer-coated pigment paste. S5. Mix the pigment paste obtained in S4 with the binder and crosslinking agent evenly to obtain an amphoteric polymer textile dyeing and finishing auxiliary pigment preparation for coating dyeing.

2. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, Before step S1, the hydrophobic epoxy acrylate monomer is further purified by pretreatment, which involves washing the hydrophobic epoxy acrylate monomer with alkaline solution to remove the polymerization inhibitor, washing it with deionized water until neutral, drying it with a desiccant, and then purifying it by vacuum distillation.

3. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S1, the temperature of the first polymerization reaction is 65–80°C, and the reaction time is 3–6 hours; the hydrophobic epoxy acrylate monomer is at least one of glycidyl methacrylate, glycidyl acrylate ether, or allyl glycidyl ether; the first initiator is an azo or peroxide oil-soluble initiator, and the amount used is 0.5%–2% of the mass of the hydrophobic epoxy acrylate monomer; the first solvent is anhydrous ethanol or ethyl acetate.

4. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S2, the tertiary amine ester monomer is at least one of dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, or dimethylaminoethyl acrylate; the quaternary ammonium salt cationic monomer is methacryloyloxyethyltrimethylammonium chloride or acryloyloxyethyltrimethylammonium chloride; the molar ratio of the tertiary amine ester monomer to the quaternary ammonium salt cationic monomer is 8:1 to 20:1; the second initiator is an azo or peroxide-based oil-soluble initiator; the second solvent is an alcohol or ester organic solvent; and the mass ratio of the core prepolymer to the bilayer core-shell prepolymer is 1:(1.5~3).

5. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S2, the temperature of the second polymerization reaction is 70-85°C, the dropping time is 1-2 hours, and the reaction is continued at the temperature for 2-4 hours after the dropping is completed; the number average molecular weight of the obtained bilayer core-shell prepolymer is controlled in the range of 8000-25000 g / mol.

6. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S3, the linear hydrophilic polymer is at least one of polyvinyl alcohol, poly(N-vinylpyrrolidone), or polyethylene glycol monomethyl ether; the amount of the linear hydrophilic polymer is 3% to 10% of the mass of the bilayer core-shell prepolymer obtained in step S2; the temperature of the outer coating composite treatment is 75 to 90°C, and the reaction time is 1 to 3 hours; the linear hydrophilic polymer is a saturated polymer, which is bonded to the bilayer core-shell prepolymer through physical coating and intermolecular hydrogen bonding.

7. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S4, the organic pigment is at least one of phthalocyanine blue, phthalocyanine green, pigment red 122, pigment yellow 14, or pigment violet 23; the mass ratio of the solid content of the amphoteric polymer solution to the organic pigment is 1:5 to 1:

20.

8. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S4, the grinding and dispersion treatment is carried out by sand milling or ball milling, with a grinding time of 2 to 8 hours, and the average particle size of the pigment particles in the resulting pigment paste is controlled in the range of 100 to 500 nm.

9. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S4, a wetting agent and an antifoaming agent are also added. The wetting agent is a polyether-modified organosiloxane, and the amount used is 0.5% to 2% of the pigment mass. The antifoaming agent is a mineral oil-based antifoaming agent, and the amount used is 0.1% to 0.5% of the total pigment paste mass.

10. The method for preparing a novel textile dyeing and finishing auxiliary pigment with amphoteric polymer according to claim 1, characterized in that, In step S5, the adhesive is a water-based polyurethane adhesive or a polyacrylate adhesive, and the amount used is 10% to 30% of the pigment paste mass; the crosslinking agent is a blocked isocyanate crosslinking agent, and the amount used is 3% to 8% of the adhesive mass.

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