Washable color fixing agent and preparation method thereof

Abstract

The invention relates to the technical field of textile printing and dyeing auxiliaries, in particular to a washable color fixing agent and a preparation method thereof. The washing-resistant color fixing agent is prepared from the following raw materials: a cationic polymer, a penetrant, organic acid, isophorone diisocyanate, polytetrahydrofuran, a cationic modifier, butyl acrylate, hydroxyl-terminated silicone oil, epoxy chloropropane, nano silicon dioxide, a photoinitiator and deionized water. The cationic polymer is formed by copolymerizing acryloyloxyethyl trimethyl ammonium chloride and acrylamide; the washing-resistant color fixing agent can form a stable cross-linked network structure on the surface of a fiber, the binding force of a dye and the fiber is remarkably improved, the color fastness of a fabric can still be kept at a high level after multiple times of washing, and the problem that the color fastness of a traditional color fixing agent is reduced after multiple times of washing is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of textile printing and dyeing auxiliaries, in particular to a water-resistant color fixing agent and a preparation method thereof. Background Art

[0002] In the dyeing process of textiles, the stability of the combination of dyes and fibers is one of the key factors affecting product quality. However, dyed textiles often face fading or staining problems caused by factors such as washing and friction in actual use, which not only affects the aesthetics of the product, but also may pose potential risks to consumer health and the environment. Although existing color fixatives can improve color fastness to a certain extent, they still have many shortcomings.

[0003] Most of the color fixing agents on the market currently use chemical substances such as quaternary ammonium salts and resin cross-linking agents. After multiple washings, the color fastness of these color fixing agents will significantly decrease, and they cannot meet consumers' requirements for the durability of textiles. For example, although the traditional dicyandiamide formaldehyde resin color fixing agent can improve the color fastness of dyed fabrics, its color fixing effect will gradually weaken after multiple washings, causing the color of the fabric to fade.

[0004] In addition, some color fixatives contain harmful substances such as formaldehyde and heavy metals, which may be released into the environment during use, causing pollution to the ecosystem and may also cause harm to human health through skin contact. For example, compounds such as bisphenol S, bisphenol F and phenol are often used as the main components of traditional acid color fixatives, but these compounds belong to environmental hormone substances and have potential endocrine disrupting effects. Long-term exposure may affect the development of the reproductive system and increase the risk of cancer. With the enhancement of environmental awareness and the continuous improvement of regulations, restrictions on these harmful substances are becoming more and more stringent, and products using these compounds will face obstacles to market access and export. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a water-resistant color fixing agent and a preparation method thereof.

[0006] In a first aspect, the present invention provides a water-resistant color fixing agent, comprising the following raw materials: a cationic polymer, a penetrant, an organic acid, isophorone diisocyanate, polytetrahydrofuran, a cationic modifier, butyl acrylate, terminal hydroxyl silicone oil, epichlorohydrin, nano-silica, a photoinitiator, and deionized water;

[0007] The cationic polymer is prepared by copolymerization of acryloyloxyethyltrimethylammonium chloride and acrylamide.

[0008] Preferably, the weight ratio of the raw materials of the washable color fixing agent is 10-20% of cationic polymer, 1-5% of penetrant, 0.5-2% of organic acid, 2-5% of isophorone diisocyanate, 5-10% of polytetrahydrofuran, 1-3% of cationic modifier, 5-10% of butyl acrylate, 2-5% of terminal hydroxyl silicone oil, 1-3% of epichlorohydrin, 0.5-2% of nano-silica, 0.1-1% of photoinitiator, and the balance of deionized water.

[0009] Preferably, the cationic modifier comprises the following preparation steps:

[0010] S21, add methacryloyloxyethyl trimethylammonium chloride and deionized water into the reaction kettle, and stir until dissolved;

[0011] S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform;

[0012] S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, and adding a pH adjuster;

[0013] S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

[0014] Preferably, in step S21, the mixture is heated to 50-60° C. during stirring; and in step S23, the mixture is heated to 60-70° C. during stirring and stirred for 2-3 h.

[0015] Preferably, the penetrant is selected from one or more of sodium alkylbenzene sulfonate, sodium dodecyl sulfate, sodium dioctyl sulfosuccinate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and hexadecyltrimethylammonium bromide.

[0016] Preferably, the organic acid is one or more of citric acid, tartaric acid, formic acid and malic acid.

[0017] Preferably, the photoinitiator is selected from one of benzoin dimethyl ether and 2,4,6-trimethylbenzoyl diphenyl phosphine oxide.

[0018] In a second aspect, the present invention provides a method for preparing a water-resistant color fixing agent as described in the first aspect, comprising the following steps:

[0019] S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 60-80° C. for reaction for 2-3 hours under nitrogen protection, to obtain a prepolymer;

[0020] S82, adding a cationic modifier to the prepolymer, reacting for 1-2 hours, adding butyl acrylate, heating at 70-90° C., reacting for 1-2 hours, and forming a copolymer;

[0021] S83, add terminal hydroxy silicone oil and epichlorohydrin, heat to 60-80°C, react for 1-2h, and obtain a mixed solution;

[0022] S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution;

[0023] S85, adding organic acid and penetrant, adjusting pH and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution;

[0024] S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent.

[0025] Preferably, in step S85, the pH adjustment range is 4.0-7.5.

[0026] Preferably, the solid content of the washable color fixing agent is 58-60%.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The washable color fixing agent of the present invention can form a stable cross-linked network structure on the fiber surface, significantly improving the binding force between the dye and the fiber. After multiple washings, the color fastness of the fabric can still be maintained at a high level, effectively solving the problem of the color fastness of the traditional color fixing agent decreasing after multiple washings.

[0029] 2. The synergistic effect of the cationic polymer and the cationic modifier in the present invention enhances the ionic bonding force between the fiber and the dye, while the nano-silicon dioxide forms a physical barrier on the fiber surface, significantly improving the color fastness to washing.

[0030] 2. The present invention adopts formaldehyde-free organic acid to replace the traditional aldehyde-containing cross-linking agent, and the formula does not contain APEO substances, thereby avoiding the use of environmental hormone substances (such as bisphenol S, bisphenol F, etc.) in traditional color fixing agents, and reducing potential harm to the environment and human health.

[0031] 3. The present invention adds penetrants and nano-silica so that the color fixing agent can effectively penetrate into the fiber, improve the uniform distribution of dyes, reduce uneven dyeing and color difference, and improve the overall dyeing quality of the fabric. The addition of terminal hydroxy silicone oil not only enhances the color fixing effect, but also gives the fabric good softness and smooth feel, thereby improving the wearing comfort of the fabric. The polytetrahydrofuran-isophorone diisocyanate prepolymer provides an elastic film layer to achieve the integration of color fixing and feel improvement. By using a photoinitiator, the color fixing agent can be quickly cured under ultraviolet irradiation to form a stable color fixing layer, thereby further improving the color fixing efficiency and durability. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0033] Example 1

[0034] The present embodiment provides a water-resistant color fixing agent, wherein the weight ratio of the raw materials of the water-resistant color fixing agent is 18% of cationic polymer, 3% of fatty alcohol polyoxyethylene ether, 1.5% of tartaric acid, 4% of isophorone diisocyanate, 8% of polytetrahydrofuran, 2.5% of cationic modifier, 8% of butyl acrylate, 4% of terminal hydroxyl silicone oil, 2% of epichlorohydrin, 1.2% of nano silicon dioxide, 0.6% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and deionized water is added to 100%.

[0035] The cationic polymer is copolymerized by acryloyloxyethyltrimethylammonium chloride and acrylamide.

[0036] The cationic modifier comprises the following preparation steps:

[0037] S21, add methacryloyloxyethyl trimethyl ammonium chloride and deionized water into the reaction kettle, stir until dissolved, and heat to 55° C. during stirring;

[0038] S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform;

[0039] S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, heating to 65°C during stirring, stirring for 2h, and adding a pH adjuster;

[0040] S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

[0041] This embodiment provides a method for preparing a washable color fixing agent, comprising the following steps:

[0042] S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 70° C. for 2 h under nitrogen protection to obtain a prepolymer;

[0043] S82, adding a cationic modifier to the prepolymer, reacting for 1 hour, adding butyl acrylate, heating to 80°C, reacting for 1 hour, and forming a copolymer;

[0044] S83, add hydroxy-terminated silicone oil and epichlorohydrin, heat to 70°C, react for 1 hour, and obtain a mixed solution;

[0045] S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution;

[0046] S85, adding organic acid and penetrant, adjusting the pH range to 7, and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution;

[0047] S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent with a solid content of 59%.

[0048] Example 2

[0049] The present embodiment provides a water-resistant color fixing agent, wherein the weight ratio of the raw materials of the water-resistant color fixing agent is 12% of cationic polymer, 5% of fatty alcohol polyoxyethylene ether, 2% of formic acid, 2% of isophorone diisocyanate, 10% of polytetrahydrofuran, 1% of cationic modifier, 10% of butyl acrylate, 2% of terminal hydroxyl silicone oil, 3% of epichlorohydrin, 0.5% of nano-silicon dioxide, 1% of benzoin dimethyl ether, and the balance of deionized water.

[0050] The cationic polymer is prepared by copolymerization of acryloyloxyethyltrimethylammonium chloride and acrylamide.

[0051] The cationic modifier comprises the following preparation steps:

[0052] S21, add methacryloyloxyethyl trimethylammonium chloride and deionized water into the reaction kettle, stir until dissolved, and heat to 55° C. during stirring;

[0053] S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform;

[0054] S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, heating to 65°C during stirring, stirring for 2h, and adding a pH adjuster;

[0055] S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

[0056] This embodiment provides a method for preparing a washable color fixing agent, comprising the following steps:

[0057] S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 70° C. for 2 h under nitrogen protection to obtain a prepolymer;

[0058] S82, adding a cationic modifier to the prepolymer, reacting for 1 hour, adding butyl acrylate, heating to 80°C, reacting for 1 hour, and forming a copolymer;

[0059] S83, add hydroxy-terminated silicone oil and epichlorohydrin, heat to 70°C, react for 1 hour, and obtain a mixed solution;

[0060] S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution;

[0061] S85, adding organic acid and penetrant, adjusting the pH range to 7, and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution;

[0062] S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent having a solid content of 58%.

[0063] Example 3

[0064] The present embodiment provides a washable color fixing agent, wherein the weight ratio of the washable color fixing agent comprises 20% of cationic polymer, 5% of fatty alcohol polyoxyethylene ether, 2% of tartaric acid, 5% of isophorone diisocyanate, 10% of polytetrahydrofuran, 3% of cationic modifier, 10% of butyl acrylate, 5% of terminal hydroxyl silicone oil, 3% of epichlorohydrin, 2% of nano silicon dioxide, 1% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and the balance of deionized water.

[0065] The cationic polymer is prepared by copolymerization of acryloyloxyethyltrimethylammonium chloride and acrylamide.

[0066] The cationic modifier comprises the following preparation steps:

[0067] S21, add methacryloyloxyethyl trimethylammonium chloride and deionized water into the reaction kettle, stir until dissolved, and heat to 55° C. during stirring;

[0068] S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform;

[0069] S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, heating to 65°C during stirring, stirring for 2h, and adding a pH adjuster;

[0070] S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

[0071] This embodiment provides a method for preparing a washable color fixing agent, comprising the following steps:

[0072] S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 70° C. for 2 h under nitrogen protection to obtain a prepolymer;

[0073] S82, adding a cationic modifier to the prepolymer, reacting for 1 hour, adding butyl acrylate, heating to 80°C, reacting for 1 hour, and forming a copolymer;

[0074] S83, add hydroxy-terminated silicone oil and epichlorohydrin, heat to 70°C, react for 1 hour, and obtain a mixed solution;

[0075] S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution;

[0076] S85, adding organic acid and penetrant, adjusting the pH range to 7, and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution;

[0077] S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent having a solid content of 58%.

[0078] Comparative Example 1

[0079] A comparative example provides a water-resistant color fixing agent, wherein the weight ratio of the raw materials of the water-resistant color fixing agent is 3% of fatty alcohol polyoxyethylene ether, 1.5% of tartaric acid, 4% of isophorone diisocyanate, 8% of polytetrahydrofuran, 2.5% of cationic modifier, 8% of butyl acrylate, 4% of terminal hydroxyl silicone oil, 2% of epichlorohydrin, 1.2% of nano silicon dioxide, 0.6% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and deionized water is supplemented to 100%.

[0080] The cationic polymer is copolymerized by acryloyloxyethyltrimethylammonium chloride and acrylamide.

[0081] The cationic modifier comprises the following preparation steps:

[0082] S21, add methacryloyloxyethyl trimethyl ammonium chloride and deionized water into the reaction kettle, stir until dissolved, and heat to 55° C. during stirring;

[0083] S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform;

[0084] S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, heating to 65°C during stirring, stirring for 2h, and adding a pH adjuster;

[0085] S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

[0086] The comparative example provides a method for preparing a water-resistant color fixing agent, comprising the following steps:

[0087] S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 70° C. for 2 h under nitrogen protection to obtain a prepolymer;

[0088] S82, adding a cationic modifier to the prepolymer, reacting for 1 hour, adding butyl acrylate, heating to 80°C, reacting for 1 hour, and forming a copolymer;

[0089] S83, add hydroxy-terminated silicone oil and epichlorohydrin, heat to 70°C, react for 1 hour, and obtain a mixed solution;

[0090] S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution;

[0091] S85, adding organic acid and penetrant, adjusting the pH range to 7, and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution;

[0092] S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent.

[0093] Comparative Example 2

[0094] The comparative example provides a water-resistant color fixing agent, wherein the weight ratio of the raw materials of the water-resistant color fixing agent is 18% of cationic polymer, 3% of fatty alcohol polyoxyethylene ether, 1.5% of tartaric acid, 4% of isophorone diisocyanate, 8% of polytetrahydrofuran, 2.5% of cationic modifier, 8% of butyl acrylate, 4% of terminal hydroxyl silicone oil, 2% of epichlorohydrin, 0.6% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and deionized water is supplemented to 100%.

[0095] The cationic polymer is copolymerized by acryloyloxyethyltrimethylammonium chloride and acrylamide.

[0096] The cationic modifier comprises the following preparation steps:

[0097] S21, add methacryloyloxyethyl trimethyl ammonium chloride and deionized water into the reaction kettle, stir until dissolved, and heat to 55° C. during stirring;

[0098] S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform;

[0099] S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, heating to 65°C during stirring, stirring for 2h, and adding a pH adjuster;

[0100] S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

[0101] The comparative example provides a method for preparing a water-resistant color fixing agent, comprising the following steps:

[0102] S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 70° C. for 2 h under nitrogen protection to obtain a prepolymer;

[0103] S82, adding a cationic modifier to the prepolymer, reacting for 1 hour, adding butyl acrylate, heating to 80°C, reacting for 1 hour, and forming a copolymer;

[0104] S83, add hydroxy-terminated silicone oil and epichlorohydrin, heat to 70°C, react for 1 hour, and obtain a mixed solution;

[0105] S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution;

[0106] S85, adding organic acid and penetrant, adjusting the pH range to 7, and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution;

[0107] S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent.

[0108] Comparative Example 3

[0109] The comparative example provides a water-resistant color fixing agent, wherein the weight ratio of the raw materials of the water-resistant color fixing agent is 3% of fatty alcohol polyoxyethylene ether, 1.5% of tartaric acid, 4% of isophorone diisocyanate, 8% of polytetrahydrofuran, 8% of butyl acrylate, 4% of terminal hydroxyl silicone oil, 2% of epichlorohydrin, 1.2% of nano silicon dioxide, 0.6% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and the weight ratio is 100%.

[0110] The cationic polymer is prepared by copolymerization of acryloyloxyethyltrimethylammonium chloride and acrylamide.

[0111] The cationic modifier comprises the following preparation steps:

[0112] S21, add methacryloyloxyethyl trimethylammonium chloride and deionized water into the reaction kettle, stir until dissolved, and heat to 55° C. during stirring;

[0113] S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform;

[0114] S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, heating to 65°C during stirring, stirring for 2h, and adding a pH adjuster;

[0115] S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

[0116] The comparative example provides a method for preparing a water-resistant color fixing agent, comprising the following steps:

[0117] S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 70° C. for 2 h under nitrogen protection to obtain a prepolymer;

[0118] S82, adding a cationic modifier to the prepolymer, reacting for 1 hour, adding butyl acrylate, heating to 80°C, reacting for 1 hour, and forming a copolymer;

[0119] S83, add hydroxy-terminated silicone oil and epichlorohydrin, heat to 70°C, react for 1 hour, and obtain a mixed solution;

[0120] S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution;

[0121] S85, adding organic acid and penetrant, adjusting the pH range to 7, and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution;

[0122] S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent.

[0123] Comparative Example 4

[0124] A commercially available quaternary ammonium salt type fixing agent is used.

[0125] The color fastness test (GB / T3921-2008) was performed on Example 1 to Example 3 and Comparative Example 1 to Comparative Example 4. The test results are shown in Table 1.

[0126] Table 1

[0127] sample Washing color fastness (grade) Dry rubbing color fastness (grade) Color fastness to perspiration (grade) Example 1 4-5 4-5 4-5 Example 2 4 3-4 4 Example 3 4 3-4 4 Comparative Example 1 2-3 2 3 Comparative Example 2 3 3 3-4 Comparative Example 3 2 2 2 Comparative Example 4 4 3 4(Contains formaldehyde residue)

[0128] The number of times of water washing resistance was tested for Examples 1 to 3 and Comparative Example 4. The test results are shown in Table 2. Table 2 (40°C soap washing)

[0129] sample Color fastness retention after 20 times Color fastness retention after 50 times Example 1 98％ 92％ Example 2 95％ 90％ Example 3 96％ 90％ Comparative Example 4 85％ 68％

[0130] The environmental performance of Examples 1 to 3 and Comparative Example 4 was tested. The test results are shown in Table 3.

[0131]

[0132]

[0133] The test results show that:

[0134] Example 1: The color fastness to washing, color fastness to dry rubbing and color fastness to perspiration all reached level 4-5, which was relatively outstanding among all samples, indicating that it has a good color fixing effect, can effectively maintain color stability, and is not easy to fade under conditions of washing, rubbing and perspiration.

[0135] Example 2 and Example 3: The color fastness to washing is level 4, the color fastness to dry rubbing is level 3-4, and the color fastness to perspiration is level 4, which is slightly inferior to Example 1, but still better than Comparative Example 1, Comparative Example 2 and Comparative Example 3, indicating that the color fixing effect is better.

[0136] Comparative Example 1: All color fastness indicators are low, with water washing color fastness of 2-3, dry rubbing color fastness of 2, and perspiration color fastness of 3. This shows that not adding cationic polymers has a greater impact on the performance of the fixing agent, and cationic polymers play a key role in improving color fastness.

[0137] Comparative Example 2: The color fastness to washing is level 3, the color fastness to dry rubbing is level 3, and the color fastness to perspiration is level 3-4. Compared with Examples 1-3, its color fastness is reduced, indicating that nano-silica also plays a positive role in the color fixing agent and helps to improve the color fastness.

[0138] Comparative Example 3: All color fastness indicators are the lowest, with water washing color fastness of level 2, dry rubbing color fastness of level 2, and perspiration color fastness of level 2. This further highlights the importance of cationic modifiers and cationic polymers in color fixing agents. The lack of these will lead to a significant decrease in the color fixing effect.

[0139] Comparative Example 4: The color fastness to washing is level 4, the color fastness to dry rubbing is level 3, and the color fastness to perspiration is level 4 (including formaldehyde residue). Although its color fastness index is not much different from that of Examples 2 and 3, there is a formaldehyde residue problem.

[0140] Examples 1-3: After 20 and 50 soap washings at 40°C, the color fastness retention rates are relatively high, with Example 1 having a retention rate of 98% after 20 times and 92% after 50 times; Example 2 having a retention rate of 95% after 20 times and 90% after 50 times; Example 3 having a retention rate of 96% after 20 times and 90% after 50 times, indicating that the washable color fixing agent of the present invention has good durability, can maintain good color fastness after multiple washings, effectively extend the service life of textiles, etc., and maintain the vividness of their colors.

[0141] Comparative Example 4: The color fastness retention rate after 20 times is 85%, and after 50 times is only 68%, which is significantly lower than that of Examples 1-3, indicating that the commercially available quaternary ammonium salt type color fixing agent is not as good as the color fixing agent of the present invention in terms of the number of water washing resistance, and its durability is poor.

[0142] Examples 1-3: The formaldehyde content was not detected and the APEO content was 0, which fully met the standard limit requirements, indicating that the water-resistant color fixing agent of the present invention has good environmental performance and will not cause harm to the environment and human health.

[0143] Comparative Example 4: The formaldehyde content is as high as 280ppm, far exceeding the standard limit of ≤75ppm. The environmental protection performance is poor, and there are great hidden dangers of environmental pollution and health risks.

[0144] The water-washable color fixing agent of the present invention has excellent performance in terms of color fastness, water-washing resistance and environmental protection performance.

[0145] The specific embodiments further describe the present invention, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A water-resistant color fixing agent, characterized in that: The raw materials include: cationic polymer, penetrant, organic acid, isophorone diisocyanate, polytetrahydrofuran, cationic modifier, butyl acrylate, terminal hydroxyl silicone oil, epichlorohydrin, nano-silica, photoinitiator, deionized water; The cationic polymer is prepared by copolymerization of acryloyloxyethyltrimethylammonium chloride and acrylamide.

2. A water-resistant color fixing agent according to claim 1, characterized in that: The weight ratio of the raw materials of the water-resistant color fixing agent is 10-20% of cationic polymer, 1-5% of penetrant, 0.5-2% of organic acid, 2-5% of isophorone diisocyanate, 5-10% of polytetrahydrofuran, 1-3% of cationic modifier, 5-10% of butyl acrylate, 2-5% of terminal hydroxyl silicone oil, 1-3% of epichlorohydrin, 0.5-2% of nano silicon dioxide, 0.1-1% of photoinitiator and the balance of deionized water.

3. A water-resistant color fixing agent according to claim 1, characterized in that: The cationic modifier comprises the following preparation steps: S21, add methacryloyloxyethyl trimethylammonium chloride and deionized water into the reaction kettle, and stir until dissolved; S22, adding N,N-methylenebisacrylamide to the reaction kettle, and continuing to stir until the mixture is uniform; S23, dissolving ammonium persulfate in deionized water, adding dropwise to the reaction kettle, stirring, and adding a pH adjuster; S24, add polyvinyl alcohol, stir evenly, and cool to room temperature to obtain a cationic modifier.

4. A water-resistant color fixing agent according to claim 3, characterized in that: In the step S21, the mixture needs to be heated to 50-60° C. during stirring; in the step S23, the mixture needs to be heated to 60-70° C. during stirring and stirred for 2-3 hours.

5. A water-resistant color fixing agent according to claim 1, characterized in that: The penetrant is selected from one or more of sodium alkylbenzene sulfonate, sodium dodecyl sulfate, sodium dioctyl sulfosuccinate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and hexadecyltrimethylammonium bromide.

6. A water-resistant color fixing agent according to claim 1, characterized in that: The organic acid is selected from one or more of citric acid, tartaric acid, formic acid and malic acid.

7. A water-resistant color fixing agent according to claim 1, characterized in that: The photoinitiator is selected from one of benzoin dimethyl ether and 2,4,6-trimethylbenzoyl diphenyl phosphine oxide.

8. A method for preparing a water-resistant color fixing agent as claimed in claims 1 to 7, characterized in that: The steps include: S81, adding isophorone diisocyanate and polytetrahydrofuran into a reaction kettle, heating at 60-80° C. for reaction for 2-3 hours under nitrogen protection, to obtain a prepolymer; S82, adding a cationic modifier to the prepolymer, reacting for 1-2 hours, adding butyl acrylate, heating at 70-90° C., reacting for 1-2 hours, and forming a copolymer; S83, add terminal hydroxy silicone oil and epichlorohydrin, heat to 60-80°C, react for 1-2h, and obtain a mixed solution; S84, dispersing nano-silicon dioxide in deionized water, ultrasonically treating for 30 minutes, adding to the mixed solution, stirring for 1 hour, and obtaining a crude product solution; S85, adding organic acid and penetrant, adjusting pH and stirring for 30 minutes, then adding photoinitiator, stirring until completely dissolved, to obtain a finished product solution; S86. Adjust the solid content with deionized water and filter to obtain a washable color fixing agent.

9. The method for preparing a water-resistant color fixing agent according to claim 8, characterized in that: In step S85, the pH adjustment range is 4.0-7.

5.

10. The method for preparing a water-resistant color fixing agent according to claim 8, characterized in that: The solid content of the water-resistant color fixing agent is 58-60%.

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