Washable high-temperature-resistant environment-friendly textile color fixing agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of textiles, and particularly relates to a washable high-temperature-resistant environment-friendly textile color fixing agent as well as a preparation method and application thereof. The washing-resistant high-temperature-resistant environment-friendly textile color fixing agent is prepared from the following raw materials in parts by mass: 20 to 40 parts of modified carboxymethyl chitosan, 5 to 10 parts of tannic acid nano microcapsules and 3 to 8 parts of modified ionic liquid, the tannic acid nano microcapsule is prepared from the following raw materials: tannic acid, pullulan, soybean protein, casein and water. The mass ratio of the tannic acid to the pullulan to the soybean protein to the casein to the water is (0.5-1.5): (3-5): (1-3): (1-3): 100. The environment-friendly textile color fixing agent disclosed by the invention not only improves the adhesive force of polyester fibers and vegetable dyes, but also has excellent washing resistance and high temperature resistance, and the obtained polyester fiber textile can be applied to a medical environment.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles, and in particular relates to a washable and high temperature resistant environmentally friendly textile color fixing agent and a preparation method and application thereof. Background Art

[0002] Polyester fiber, commonly known as "polyester", is a synthetic fiber obtained by spinning polyester formed by the condensation of organic dibasic acids and diols. In recent years, polyester fiber has been widely used in the textile field due to its advantages such as wrinkle resistance, ironing-free, durability, and non-stickiness.

[0003] In the process of textile manufacturing, in order to meet people's demand for different colors of textiles, textiles need to be dyed. With the continuous improvement of people's environmental awareness and safety awareness, plant dyes are more environmentally friendly and harmless to human health during production and use than synthetic dyes. They can also give textiles insect repellent and antibacterial functions, so they have attracted more and more attention.

[0004] However, since polyester fiber has only two terminal alcohol hydroxyl active groups in its molecular structure and the molecules are tightly arranged, it is difficult for plant dyes to firmly combine with it, so there is a problem of poor color fastness, and a fixing agent is needed to improve its color fastness.

[0005] The color fixing agent for polyester fiber disclosed in the prior art, for example, the Chinese patent with publication number CN114753171A discloses a cationic formaldehyde-free hydrophilic polyester color fixing agent, which is formed by reacting the following components by weight: 40-50 parts of epichlorohydrin; 35-45 parts of small molecular amines; an appropriate amount of chelating agent; 3-10 parts of cationic monomer; 5-10 parts of deionized water; 0.1-1 part of initiator; the cationic monomer is composed of 3-chloro-2-hydroxypropyltrimethylammonium chloride and methacryloyloxyethyltrimethylammonium chloride in a ratio of 3-4:1. The color fixing agent is particularly suitable for polyester fiber, has a good color fixing effect, and can form a stable film on the surface of polyester. The Chinese patent with publication number CN118007456A discloses a color fixing agent, a preparation method thereof, and a color fixing process. The color fixing agent comprises the following raw materials in parts by weight: 0.05-0.1 parts of amino cage-type polysilsesquioxane, 0.6-1 parts of chitosan, 0.1-0.5 parts of carboxylated carbon nanotubes, 0.01-0.05 parts of anionic dispersants, 0.3-0.5 parts of silicone elastomer emulsions, and 0.5-1 parts of polyethylene glycol oleate. The color fixing agent of the technical solution has the advantage of increasing the levelness and color fastness of disperse dyes.

[0006] However, the above-mentioned prior arts are all aimed at disperse dyes, which are usually hydrophobic and can enter polyester fibers more easily than plant dyes. In addition, disperse dyes can be dyed at high temperatures, which is beneficial to opening the molecular chain structure of polyester fibers and making it easier for the dyes to enter the fibers and be fixed. However, the pigments in plant dyes are very sensitive to temperature and cannot be dyed at high temperatures. Therefore, the above-mentioned technical solutions cannot be applied to polyester fibers dyed with plant dyes.

[0007] In addition, polyester fiber textiles are widely used in medical environments due to their excellent performance. Due to the particularity of the medical environment, medical polyester fiber textiles need to be frequently cleaned and sterilized at high temperatures, and the pigments in plant dyes are very sensitive to temperature, which limits their application in medical environments. Summary of the invention

[0008] In view of the above problems, the present invention provides a washable and high temperature resistant environmentally friendly textile color fixing agent and a preparation method and application thereof. The environmentally friendly textile color fixing agent of the present invention not only improves the adhesion between polyester fiber and plant dyes, but also has excellent washability and high temperature resistance. The obtained polyester fiber textiles can be used in medical environments.

[0009] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0010] The first aspect of the present invention provides an environmentally friendly textile color fixing agent that is washable and heat-resistant. The raw materials include, by weight, 20-40 parts of modified carboxymethyl chitosan, 5-10 parts of tannic acid nano-microcapsules, and 3-8 parts of modified ionic liquids; the raw materials of the tannic acid nano-microcapsules include tannic acid, pullulan, soy protein, casein and water; the mass ratio of the tannic acid, pullulan, soy protein, casein and water is (0.5-1.5):(3-5):(1-3):(1-3):100.

[0011] Preferably, the modified carboxymethyl chitosan is obtained by mixing carboxymethyl chitosan, polyacrylic acid, cellulose nano whiskers and water.

[0012] Preferably, the mass ratio of the carboxymethyl chitosan, polyacrylic acid and water is (2-4): (2-4): 100, preferably 3:2:100.

[0013] Preferably, the mass ratio of the carboxymethyl chitosan to the cellulose nanowhiskers is 1:(0.1-0.3), preferably 1:0.2.

[0014] Preferably, the preparation method of the modified carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan and polyacrylic acid in water to obtain a mixed solution, adding nanocrystalline fibers and stirring to obtain the mixed solution.

[0015] Preferably, the stirring conditions are: stirring temperature is 30-50° C., and stirring time is 10-30 min.

[0016] Preferably, the cellulose nanowhiskers have a diameter of 4-10 nm and a length of 100-500 nm.

[0017] Preferably, the preparation method of the tannic acid nano-microcapsules is: tannic acid, pullulan, soy protein and water are uniformly mixed to obtain a mixed solution, the mixed solution is sonicated, casein is added, and the sonication is continued to obtain the mixed solution.

[0018] Preferably, the mass ratio of tannic acid, pullulan, soy protein, casein and water is 1:4:2:2:100.

[0019] Preferably, the ultrasonic conditions are: ultrasonic power of 400-600W, and ultrasonic temperature of 25-30°C.

[0020] Preferably, the mixed solution is sonicated for 3-5 minutes, casein is added thereto, and sonication is continued for 1-3 minutes.

[0021] Preferably, a pH regulator is used during the ultrasonic process to ensure that the pH of the system is 3.5-4.5.

[0022] The pH adjuster in the present invention is not particularly limited, and is preferably an organic acid, such as citric acid, glacial acetic acid, and the like.

[0023] Preferably, the modified ionic liquid is obtained by mixing zinc bromide and 1-butyl-3-methylimidazolium chloride.

[0024] Preferably, the conditions for mixing the zinc chloride and 1-butyl-3-methylimidazolium chloride are: temperature of 30-50° C. and time of 10-15 hours.

[0025] Preferably, the molar ratio of zinc chloride to 1-butyl-3-methylimidazolium chloride is 1:(1-1.2), preferably 1:1.2.

[0026] The second aspect of the present invention provides a method for preparing the above-mentioned water-washable and high-temperature-resistant environmentally friendly textile color fixing agent, comprising the following steps: uniformly mixing modified carboxymethyl chitosan, tannic acid nano-microcapsules, and modified ionic liquid to obtain the obtained product.

[0027] The third aspect of the present invention provides the use of the above-mentioned environmentally friendly textile color fixing agent that is resistant to water washing and high temperature in textile dyeing.

[0028] Preferably, the textile is a polyester fiber textile.

[0029] Preferably, the dye used for dyeing the polyester fiber textile is a natural dye.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Since there are fewer ligands in the molecular structure of plant dyes, the effect of fixing by forming a complex with the plant dyes is poor. The present invention creatively introduces tannic acid nano-microcapsules, and the prepared fixing agent improves the adhesion of the plant dyes to the polyester fiber. The inventors speculate that this is because the tannic acid nano-microcapsules of the present invention have a three-layer structure, with tannic acid as the core, pullulan and soy protein as the middle shell, and casein as the outer shell, so that the tannic acid nano-microcapsules can continuously complex with the plant dyes, and the tannic acid nano-microcapsules under the action of the modified ionic liquid can introduce the plant dyes into the non-crystalline region of the polyester fiber, thereby improving the color fastness of the plant dyes, and the obtained polyester fiber textiles have good water washing resistance.

[0032] 2. The inventors found that when only tannic acid nano-microcapsules exist in the color fixing agent, although the adhesion between the plant dye and the polyester fiber can be improved to a certain extent, the color fastness of the polyester fiber textile decreases rapidly with the increase of the number of water washings. When the modified ionic liquid is added to the color fixing agent, the number of water washing resistance of the textile is improved. The inventors speculate that this is because the modified ionic liquid after the mixture of zinc chloride and 1-butyl-3-methylimidazolium chloride changes from the original anionic type to the chelated metal ion type. On the one hand, the interaction with the polyester fiber is enhanced, the free volume of the polyester fiber is increased, and the tannic acid nano-microcapsules are easier to be incorporated into the polyester fiber; on the other hand, the chelation effect can further improve the adhesion of the plant dye to the polyester fiber, thereby improving the water resistance of the polyester fiber textile.

[0033] 3. Plant dyes are sensitive to temperature, and medical polyester fiber textiles need to be frequently cleaned and sterilized at high temperature, which limits their application. The inventors found that carboxymethyl chitosan modified by polyacrylic acid and cellulose nano whiskers can improve the color fixation of the color fixer on plant dyes. The polyester fiber textiles have excellent color fastness after boiling and disinfection at 100°C, and still have excellent color fastness after multiple boiling and disinfection. The inventors speculate that this is because the cellulose nano whiskers are interspersed in the cross-linked composite film of carboxymethyl chitosan and polyacrylic acid, which improves the bonding fastness of plant dyes and polyester fibers while having good high temperature resistance, thereby avoiding plant dyes from being destroyed by high temperature. At the same time, the inventors unexpectedly found that the synergistic effect between the modified carboxymethyl chitosan, tannic acid nano microcapsules, and modified ionic liquids is best when the mass ratio is (20-40): (5-10): (3-8), and the obtained color fixer has excellent comprehensive properties. DETAILED DESCRIPTION

[0034] The present invention is further explained below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] In the following examples, unless otherwise specified, all raw materials used were commercially available or prepared by conventional methods in the art.

[0036] The following is an example:

[0037] Carboxymethyl chitosan was purchased from Jiangsu Kangting Biotechnology Co., Ltd., with a carboxylation degree of ≥80%.

[0038] Polyacrylic acid was purchased from Shandong DeLan Chemical Co., Ltd. with a solid content of ≥40%.

[0039] Cellulose nanowhiskers were purchased from Guilin Qihongke Co., Ltd.

[0040] Tannic acid was purchased from Shaanxi Haochen Biotechnology Co., Ltd., and the tannic acid content was ≥92%.

[0041] Pullulan was purchased from Shandong Kangnaxin Biotechnology Co., Ltd.

[0042] Buy soy protein from Yangzhou Mufan Biotechnology Co., Ltd., the content is 90%.

[0043] Casein can be purchased from Yangzhou Mufan Biotechnology Co., Ltd., with a content of 90%.

[0044] 1-Butyl-3-methylimidazolium chloride was purchased from Suzhou Haofan Biotechnology Co., Ltd.

[0045] Example 1

[0046] A water-washable and high-temperature-resistant environmentally friendly textile color fixing agent comprises, by weight, 20 parts of modified carboxymethyl chitosan, 5 parts of tannic acid nano-microcapsules and 3 parts of modified ionic liquid.

[0047] The preparation method of the modified carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan and polyacrylic acid in water to obtain a mixed solution, adding nano crystal fibers and stirring at 30° C. for 30 minutes to obtain the mixed solution.

[0048] The mass ratio of the carboxymethyl chitosan, polyacrylic acid and water is 2:2:100.

[0049] The mass ratio of the carboxymethyl chitosan to the cellulose nano whiskers is 1:0.1.

[0050] The diameter of the cellulose nano whisker is 4-10nm, and the length is 100-500nm.

[0051] The preparation method of the tannic acid nano-microcapsules is as follows: tannic acid, pullulan, soy protein and water are uniformly mixed to obtain a mixed solution, the mixed solution is ultrasonicated for 5 minutes, the ultrasonic power is 400W, the ultrasonic temperature is 25°C, casein is added, and the ultrasonication is continued for 3 minutes.

[0052] The mass ratio of the tannic acid, pullulan, soy protein, casein and water is 0.5:3:1:1:100.

[0053] During the ultrasonic process, citric acid was used to ensure that the pH of the system was 4.

[0054] The modified ionic liquid is obtained by mixing zinc bromide and 1-butyl-3-methylimidazolium chloride at a temperature of 30° C. for 15 hours.

[0055] The molar ratio of the zinc chloride to 1-butyl-3-methylimidazolium chloride is 1:1.

[0056] The preparation method of the above-mentioned environmentally friendly textile color fixing agent which is resistant to water washing and high temperature comprises the following steps: uniformly mixing modified carboxymethyl chitosan, tannic acid nano-microcapsules and modified ionic liquid to obtain the fixed agent.

[0057] Example 2

[0058] A washable and high temperature resistant environmentally friendly textile color fixing agent comprises, by weight, 40 parts of modified carboxymethyl chitosan, 10 parts of tannic acid nano-microcapsules and 8 parts of modified ionic liquid.

[0059] The preparation method of the modified carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan and polyacrylic acid in water to obtain a mixed solution, adding nano crystal fibers and stirring at 50° C. for 10 minutes to obtain the mixed solution.

[0060] The mass ratio of the carboxymethyl chitosan, polyacrylic acid and water is 4:4:100.

[0061] The mass ratio of the carboxymethyl chitosan to the cellulose nano whiskers is 1:0.3.

[0062] The cellulose nano whiskers have a diameter of 4-10 nm and a length of 100-500 nm and are purchased from Guilin Qihongke Co., Ltd.

[0063] The preparation method of the tannic acid nano-microcapsules is as follows: tannic acid, pullulan, soy protein and water are uniformly mixed to obtain a mixed solution, the mixed solution is ultrasonicated for 3 minutes, the ultrasonic power is 600W, the ultrasonic temperature is 30°C, casein is added, and the mixture is ultrasonicated for 1 minute.

[0064] The mass ratio of the tannic acid, pullulan, soy protein, casein and water is 1.5:5:3:3:100.

[0065] During the ultrasonic process, citric acid was used to ensure that the pH of the system was 4.

[0066] The modified ionic liquid is obtained by mixing zinc bromide and 1-butyl-3-methylimidazolium chloride at a temperature of 50° C. for 10 hours.

[0067] The molar ratio of the zinc chloride to 1-butyl-3-methylimidazolium chloride is 1:1.2.

[0068] The preparation method of the above-mentioned environmentally friendly textile color fixing agent which is resistant to water washing and high temperature comprises the following steps: uniformly mixing modified carboxymethyl chitosan, tannic acid nano-microcapsules and modified ionic liquid to obtain the fixed agent.

[0069] Example 3

[0070] A washable and high temperature resistant environmentally friendly textile color fixing agent comprises, by weight, 30 parts of modified carboxymethyl chitosan, 8 parts of tannic acid nano-microcapsules and 5 parts of modified ionic liquid.

[0071] The preparation method of the modified carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan and polyacrylic acid in water to obtain a mixed solution, adding nano crystal fibers and stirring at 40° C. for 20 minutes to obtain the mixed solution.

[0072] The mass ratio of the carboxymethyl chitosan, polyacrylic acid and water is 3:3:100.

[0073] The mass ratio of the carboxymethyl chitosan to the cellulose nano whiskers is 1:0.2.

[0074] The cellulose nano whiskers have a diameter of 4-10 nm and a length of 100-500 nm and are purchased from Guilin Qihongke Co., Ltd.

[0075] The preparation method of the tannic acid nano-microcapsules is as follows: tannic acid, pullulan, soy protein and water are uniformly mixed to obtain a mixed solution, the mixed solution is ultrasonicated for 2 minutes, the ultrasonic power is 500W, the ultrasonic temperature is 28°C, casein is added, and the mixture is ultrasonicated for 2 minutes.

[0076] The mass ratio of the tannic acid, pullulan, soy protein, casein and water is 1:4:2:2:100.

[0077] During the ultrasonic process, citric acid was used to ensure that the pH of the system was 4.

[0078] The modified ionic liquid is obtained by mixing zinc bromide and 1-butyl-3-methylimidazolium chloride at a temperature of 40° C. for 12 hours.

[0079] The molar ratio of the zinc chloride to 1-butyl-3-methylimidazolium chloride is 1:1.1.

[0080] The preparation method of the above-mentioned environmentally friendly textile color fixing agent which is resistant to water washing and high temperature comprises the following steps: uniformly mixing modified carboxymethyl chitosan, tannic acid nano-microcapsules and modified ionic liquid to obtain the fixed agent.

[0081] Comparative Example 1

[0082] The difference from Example 3 is that the preparation method of the modified carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan and polyacrylic acid in water to obtain the modified carboxymethyl chitosan; the rest are the same.

[0083] Comparative Example 2

[0084] The difference from Example 3 is that polyacrylic acid is replaced by carboxymethyl chitosan of the same mass; the rest are the same.

[0085] Comparative Example 3

[0086] The difference from Example 3 is that the modified carboxymethyl chitosan is replaced by carboxymethyl chitosan of the same mass; the rest are the same.

[0087] Comparative Example 4

[0088] The difference from Example 3 is that the preparation method of the tannic acid nano-microcapsules is: tannic acid, pullulan, soy protein, casein and water are mixed evenly to obtain a mixed solution, and the mixed solution is ultrasonicated for 2 minutes, the ultrasonic power is 500 W, and the ultrasonic temperature is 28°C; the rest are the same.

[0089] Comparative Example 5

[0090] The difference from Example 3 is that pullulan is replaced with soybean protein of the same mass; the rest are the same.

[0091] Comparative Example 6

[0092] The difference from Example 3 is that the tannic acid nanocapsules are replaced with tannic acid of equal mass; the rest are the same.

[0093] Comparative Example 7

[0094] The difference from Example 3 is that the modified ionic liquid is replaced by 1-butyl-3-methylimidazolium chloride of the same mass; the rest are the same.

[0095] Comparative Example 8

[0096] The difference from Example 3 is that the washable and high temperature resistant environmentally friendly textile fixing agent comprises, by weight, 45 parts of modified carboxymethyl chitosan, 12 parts of tannic acid nanocapsules, and 2 parts of modified ionic liquid.

[0097] Application Examples

[0098] The environmentally friendly textile fixing agents of Examples 1-3 and Comparative Examples 1-8 were respectively mixed with 3owf / % plant dye (Natural 10006 red brown, raw material: catechu, purchased from Zhou Meisheng Biomaterial Co., Ltd.) to obtain a dyeing solution, and the polyester fiber textile was placed in the dyeing solution for dyeing, the bath ratio was 1:40, the heating rate was 1°C / min, the temperature was raised to 40°C, and the temperature was kept warm for 30min, and then the temperature was raised to 60°C at a heating rate of 1°C / min, and the temperature was kept warm for 30min, and then taken out; dried at 60°C, and the following tests were performed:

[0099] 1. Color difference: △E is the difference between the K / S value of the dyed polyester fabric and the K / S value of the confirmed color card. △E is read by a computer colorimeter.

[0100] 2. Washability: The color fastness after the first and 50th washings were measured according to the method in GB / T3921-2008 “Textiles - Tests for Color Fastness - Color Fastness to Washing with Soap”.

[0101] 3. High temperature resistance: Refer to the method in WS / T508-2016 "Technical Specifications for Washing and Disinfection of Medical Fabrics in Hospitals" for boiling disinfection (bath ratio 20, 100°C, 20min), and measure the color fastness after the first boiling disinfection and the color fastness after the 50th boiling disinfection.

[0102]

[0103] As can be seen from Table 1, the color fixing agents of Examples 1-3 enable the polyester fiber textiles dyed with plant dyes to have lower color difference, excellent water washing resistance and high temperature resistance;

[0104] Comparative Example 1 Since there is no nanocrystalline cellulose in the modified carboxymethyl chitosan, the obtained color fixing agent causes the color fastness of the polyester fiber textile dyed with plant dyes to decrease after the 50th soap washing and the high temperature resistance to decrease;

[0105] In Comparative Example 2, since polyacrylic acid is replaced with carboxymethyl chitosan of equal mass, the obtained color fixing agent reduces the washing resistance and high temperature resistance of the polyester fiber textile dyed with plant dyes;

[0106] In Comparative Example 3, since the modified carboxymethyl chitosan is replaced by carboxymethyl chitosan of equal mass, the obtained color fixing agent causes the color difference of the polyester fiber textile dyed with plant dye to become larger, the water washing resistance to decrease, and the high temperature resistance to decrease;

[0107] Comparative Example 4: Since tannic acid, pullulan, soy protein, casein and water are directly mixed, the obtained tannic acid nano-microcapsules have tannic acid as the core and pullulan, soy protein and casein as the shell; the obtained fixing agent reduces the color fastness of the polyester fiber textile dyed with plant dyes after the 50th soap washing and reduces the high temperature resistance;

[0108] In Comparative Example 5, due to the replacement of pullulan with soybean protein of equal mass, the obtained fixing agent caused the color fastness of the polyester fiber textile dyed with plant dyes to decrease after the 50th soap washing and the color fastness to the 50th boiling disinfection;

[0109] In Comparative Example 6, since the tannic acid nano-microcapsules were replaced with tannic acid of equal mass, the obtained color fixing agent caused the color difference of the polyester fiber textile dyed with plant dyes to become larger, the water washing resistance to decrease, and the high temperature resistance to decrease;

[0110] In Comparative Example 7, since the modified ionic liquid is replaced with 1-butyl-3-methylimidazolium chloride of the same mass, the obtained color fixing agent causes the color difference of the polyester fiber textile dyed with plant dyes to become larger, the water washing resistance to decrease, and the high temperature resistance to decrease;

[0111] In Comparative Example 8, since the mass ratio of modified carboxymethyl chitosan, tannic acid nano-microcapsules, and modified ionic liquid is not within the preferred range, the obtained color fixing agent causes the color difference of polyester fiber textiles dyed with plant dyes to become larger, the water washing resistance to decrease, and the high temperature resistance to decrease.

[0112] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A washable and high temperature resistant environmentally friendly textile color fixing agent, characterized in that: The raw materials include, by weight: 20-40 parts of modified carboxymethyl chitosan, 5-10 parts of tannic acid nano-microcapsules, and 3-8 parts of modified ionic liquids; the raw materials of the tannic acid nano-microcapsules include tannic acid, pullulan, soy protein, casein and water; the mass ratio of the tannic acid, pullulan, soy protein, casein and water is (0.5-1.5):(3-5):(1-3):(1-3):

100.

2. The washable and high temperature resistant environmentally friendly textile color fixing agent according to claim 1, characterized in that: The modified carboxymethyl chitosan is obtained by mixing carboxymethyl chitosan, polyacrylic acid, cellulose nano whiskers and water.

3. The washable and high temperature resistant environmentally friendly textile color fixing agent according to claim 2, characterized in that: The mass ratio of the carboxymethyl chitosan, polyacrylic acid and water is (2-4): (2-4): 100; the mass ratio of the carboxymethyl chitosan and cellulose nano whiskers is 1: (0.1-0.3).

4. The washable and high temperature resistant environmentally friendly textile color fixing agent according to claim 3, characterized in that: The diameter of the cellulose nano whisker is 4-10nm, and the length is 100-500nm.

5. The washable and high temperature resistant environmentally friendly textile color fixing agent according to claim 1, characterized in that: The preparation method of the tannic acid nano-microcapsules comprises the following steps: uniformly mixing tannic acid, pullulan, soy protein and water to obtain a mixed solution, ultrasonicating the mixed solution, adding casein, and continuing ultrasonicating to obtain the mixed solution.

6. The washable and high temperature resistant environmentally friendly textile color fixing agent according to claim 1, characterized in that: The modified ionic liquid is obtained by mixing zinc bromide and 1-butyl-3-methylimidazolium chloride.

7. The washable and high temperature resistant environmentally friendly textile color fixing agent according to claim 6, characterized in that: The molar ratio of the zinc chloride to 1-butyl-3-methylimidazolium chloride is 1:(1-1.2).

8. The method for preparing the washable and high temperature resistant environmentally friendly textile color fixing agent according to any one of claims 1 to 7, characterized in that: The following steps are involved: The modified carboxymethyl chitosan, tannic acid nano-microcapsules and modified ionic liquid are uniformly mixed to obtain the product.

9. Use of the washable and high temperature resistant environmentally friendly textile fixing agent according to any one of claims 1 to 7 in textile dyeing.

10. The use according to claim 9, characterized in that: The textile is a polyester fiber textile; and the dye used to dye the polyester fiber textile is a natural dye.

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