Washable chlorine-resistant color fixing agent and preparation method thereof

Abstract

The invention belongs to the technical field of fabric color fixation, and discloses a washable chlorine-resistant color fixing agent which comprises a first color fixing component and a second color fixing component, the mass ratio of the first color fixing component to the second color fixing component is (1.5-3): 1, the first color fixing component is obtained by polymerizing polyethyleneimine and epoxy chloropropane, and the second color fixing component is obtained by polymerizing polyethyleneimine and epoxy chloropropane. The second color fixing component is a polyurethane color fixing agent or is obtained by polymerizing at least two cationic color fixing agents, the cationic color fixing agents are cationic color fixing agents containing nitrogen elements, and the polyurethane color fixing agents take-NCO as end-capping groups. The invention further discloses a preparation method for preparing the washing-resistant chlorine-resistant color fixing agent.

Description

Technical Field

[0001] The invention relates to the technical field of fabric color fixing, in particular to a washable and chlorine-resistant color fixing agent and a preparation method thereof. Background Art

[0002] Active chlorine in tap water is the main reason for the color change and even fading of dyed fabrics. Nowadays, due to the low cost and effectiveness of chlorine in sterilization, it is widely used to disinfect tap water, so the chlorine content in tap water in cities in my country is relatively high. People have found that the color of clothes has changed after washing in the process of using tap water for a long time. This is because in addition to the role of oxidation and bleaching, active chlorine can also undergo chlorination reactions. When textiles come into contact with tap water containing active chlorine, the dyes on the fibers are easily exposed to active chlorine, which will directly react with the dyes and thus be destroyed by oxidation or chlorination to varying degrees, resulting in changes in the color of textiles, including direct dyes, cationic dyes, and especially active dyes, which are easily degraded by active chlorine, causing the color of clothing to change during the washing process.

[0003] With the improvement of people's living standards in China, people's demand for upgrading textile consumption has become increasingly prominent. The problem of reactive dyes' poor durability in appearance of dyed fabrics due to their inability to resist chlorinated water has been completely exposed to people's attention and has gradually attracted people's attention. The current chlorine-resistant color fixing agents are mostly composed of poly(ethylene polyamine) and antioxidants. These color fixing agent molecules are adsorbed on the surface of fabrics through hydrogen bonds or van der Waals forces, have high solubility in water, and gradually dissolve in water during repeated washing, which reduces chlorine fastness. Therefore, the expectation of this field of the industry is to improve chlorine bleaching fastness while providing excellent washing durability so that textiles can maintain consistent color for a long time.

[0004] Chinese patent application 202210170130.4 discloses an application of an active hydrophilic formaldehyde-free color fixing agent, and the steps for preparing the color fixing agent are:

[0005] 1) Add tertiary amine slowly to concentrated hydrochloric acid while stirring, keep warm for reaction, and adjust the pH of the solution to 3-4 with tertiary amine;

[0006] 2) Raise the temperature to 45°C, slowly add epichlorohydrin dropwise, keep the temperature at 45-55°C, react for 1.0-2.5h to a homogeneous solution, then adjust the pH value and cool down to obtain an intermediate product;

[0007] 3) The intermediate product, polyethyleneimine and deionized water are added to a reaction bottle, and epichlorohydrin is slowly added dropwise with stirring. The reaction is kept at 20-40° C. for 5-7 hours, and the pH value is adjusted to 6-7 at 65-80° C., and the temperature is lowered to obtain a hydrophilic color fixing agent; the hydrophilic formaldehyde-free color fixing agent is prepared with water into a 2.0% color fixing agent working solution; then the fabric to be treated is immersed in the color fixing agent working solution, wherein the immersion temperature is 40-50° C., the immersion bath ratio is 1:10, and the immersion time is 20-30 minutes; finally, the fabric is taken out and dried, the drying temperature is 95-105° C., and the drying time is 1-2 minutes.

[0008] This scheme introduces quaternary ammonium salt cationic groups and epoxy groups into the polyethyleneimine polymer skeleton containing amino groups, so it has good hydrophilic properties.

[0009] And because the hydrophilic formaldehyde-free color fixing agent of this scheme introduces quaternary ammonium salt cationic groups, the cationic degree is further improved, and it can react with active dyes to form water-insoluble salts; at the same time, reactive epoxy groups are introduced, which can further form a strong chemical bond with the fiber or dye, and form a high molecular polymer film on the surface of the cotton fiber, firmly encapsulating the dye therein, so it has good color fastness to washing, color fastness to rubbing and other properties.

[0010] The hydrophilic formaldehyde-free color fixing agent of this scheme has both good color fixing performance and hydrophilic performance. After the cotton fabric is subjected to color fixing finishing, it has little effect on the hydrophilicity of the fabric itself, and can meet the requirements of the printing and dyeing factory for the hydrophilic formaldehyde-free color fixing agent.

[0011] Chinese patent application 202311391528.1 discloses a blended fabric fixing agent, which is obtained by free radical polymerization of the following monomers: 40-48 parts by weight of dimethyldiallylammonium chloride; 0.1-0.5 parts by weight of siloxane containing unsaturated bonds; 0.5-2.0 parts by weight of epoxy polyether containing unsaturated bonds; 1.0-3.0 parts by weight of C13-C16 acrylic acid ester or C13-C16 methacrylic acid ester; 0.5-2.0 parts by weight of sulfonic acid or sulfonate containing unsaturated bonds; 0.5-6 parts by weight of crosslinking monomer;

[0012] The color fixing agent prepared by this scheme adopts the mature DMDAAC route, and introduces siloxane containing unsaturated bonds, C13-C16 acrylic acid esters or C13-C16 methacrylic acid esters to improve the feel of the fabric, increase the softness of the fabric, improve the color fastness, and improve the stability of free radical polymerization, ultimately obtaining a product that meets the expected indicators.

[0013] The problem to be solved by this scheme is: how to provide a water-washable and chlorine-resistant color fixing agent. Summary of the invention

[0014] The object of the present invention is to provide a chlorine-resistant color fixing agent that is washable and chlorine-resistant;

[0015] Another object of the present application is to provide a method for preparing the above-mentioned low-hydrolysis chlorine-resistant fixing agent.

[0016] To achieve the above object, the present application discloses a water-resistant and chlorine-resistant color fixing agent, comprising a first color fixing component and a second color fixing component, wherein the mass ratio between the first color fixing component and the second color fixing component is 1.5 to 3:1;

[0017] The first color fixing component is obtained by polymerization of polyethyleneimine and epichlorohydrin;

[0018] The second color fixing component is a polyurethane color fixing agent or is obtained by polymerizing at least two cationic color fixing agents;

[0019] The cationic color fixing agent is a cationic color fixing agent containing nitrogen;

[0020] The polyurethane color fixing agent is a polyurethane color fixing agent with -NCO as the end-capping group.

[0021] Preferably, the second color-fixing component is obtained by polymerizing at least two cationic color-fixing agents.

[0022] Preferably, the cationic color fixing agent is selected from diallylamine, acrylamide, dimethyldiallylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, acryloyloxyethyltrimethylammonium chloride;

[0023] Preferably, the second color fixing agent is obtained by polymerization of diallylamine, acrylamide and dimethyldiallylammonium chloride, and the molar ratio of diallylamine, acrylamide and dimethyldiallylammonium chloride is 15-25:4-15:100-110.

[0024] Preferably, the washable and chlorine-resistant color fixing agent does not precipitate solid matter within 30 days at 5°C.

[0025] In addition, the present application also discloses a method for preparing the above-mentioned water-washable and chlorine-resistant color fixing agent, which is characterized by comprising the following steps:

[0026] Step 1: mixing and polymerizing polyethyleneimine and epichlorohydrin to obtain a first color fixing component;

[0027] Step 2: mixing, polymerizing or weighing at least two cationic color fixing agents with a polyurethane color fixing agent to obtain a second color fixing component;

[0028] Step 3: Mix the first color fixing component and the second color fixing component in a mass ratio of 1.5 to 3:1 to obtain a water-resistant and chlorine-resistant color fixing agent.

[0029] Preferably, step 1 includes the following sub-steps:

[0030] Step A1: Add polyethyleneimine into a flask while stirring and heating;

[0031] Step A2: Control the temperature at 20-50°C, add epichlorohydrin dropwise to polyethyleneimine, keep warm for 2-3 hours, and control the temperature at 70-75°C;

[0032] Step A3: Cool during heat preservation and adjust the pH value to 6.5-7.5 with glacial acetic acid to obtain a first color-fixing component.

[0033] Preferably, the step 2 is specifically as follows: adding at least two cationic color fixing agents into a flask in a nitrogen atmosphere, then adjusting the pH value to 4-5, heating to 80° C., adding initiators respectively, reacting for 2-3 hours, and cooling to obtain a second color fixing component;

[0034] The initiator is an aqueous solution of ammonium persulfate or sodium bisulfite.

[0035] Preferably, the step 3 specifically comprises: mixing the first color fixing agent component and the second color fixing agent component in a mass ratio of 1.5 to 3:1, and stirring to obtain a water-resistant and chlorine-resistant color fixing agent.

[0036] The beneficial effects of this application are:

[0037] 1. Polyethyleneimine has a large amine density. Therefore, the chlorine-resistant color fixing agent molecules of the present application contain a large number of secondary amines, primary amines and other amine groups. When the free active chlorine in the water contacts the fabric, it will react with the amines first, which can more effectively block the attack of the active chlorine on the dye and significantly improve the chlorine-resistant color fastness of the fabric.

[0038] 2. The compounded polycationic fixing agent can cross-link into a network film on the fiber surface and tightly bond with the fabric, so that the fixing agent molecules can survive multiple washings without falling off, allowing the fabric to maintain excellent chlorine resistance for a long time and have excellent durability. DETAILED DESCRIPTION

[0039] The present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. In the description of the present invention, it should be noted that, if no specific conditions are specified in the embodiments, the conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0040] Before presenting the examples, the source information of the raw materials involved in the examples is first explained, as shown in Table 1:

[0041] Table 1

[0042]

[0043] Example 1

[0044] Step 1:

[0045] Step A1: Add a linear polyethyleneimine aqueous solution (concentration of 50%, molecular weight of 20,000-50,000) into a flask while stirring;

[0046] Step A2: Control the temperature at 20°C, add epichlorohydrin dropwise to the polyethyleneimine aqueous solution at a mass ratio of 1:1, keep the temperature for 3 hours, and control the temperature at 70°C;

[0047] Step A3: cooling during the heat preservation and adjusting the pH value to 6.75±0.25 with glacial acetic acid to obtain a first color fixing component;

[0048] Step 2: diallylamine and dimethyldiallylammonium chloride are added into a flask in a nitrogen atmosphere at a molar ratio of 15:100, and then the pH value is adjusted to 4.5±0.5, and the mixture is heated to 80°C, an initiator is added, reacted for 4 hours, and cooled to obtain a second color fixing component;

[0049] The initiator is an aqueous solution prepared by mixing sodium sulfite and ammonium persulfate in a mass ratio of 1:1, and the total mass fraction of sodium sulfite and ammonium persulfate in the aqueous solution is 5%;

[0050] Step 3: Mix the first color fixing agent component and the second color fixing agent component in a mass ratio of 1.5:1, and stir to obtain a water-resistant and chlorine-resistant color fixing agent.

[0051] Example 2

[0052] Step 1:

[0053] Step A1: Add a linear polyethyleneimine aqueous solution (concentration of 50%, molecular weight of 20,000-50,000) into a flask while stirring;

[0054] Step A2: Control the temperature at 50°C, add epichlorohydrin dropwise to polyethyleneimine, add epichlorohydrin dropwise to the polyethyleneimine aqueous solution at a mass ratio of polyethyleneimine to epichlorohydrin of 1:1, keep warm for 2 hours, and control the temperature at 75°C;

[0055] Step A3: cooling during the heat preservation and adjusting the pH value to 6.75±0.25 with glacial acetic acid to obtain a first color fixing component;

[0056] Step 2: diallylamine and dimethyldiallylammonium chloride are added into a flask in a nitrogen atmosphere at a molar ratio of 15:100, and then the pH value is adjusted to 4.5±0.5, and the mixture is heated to 80°C, an initiator is added, reacted for 5 hours, and cooled to obtain a second color fixing component;

[0057] The initiator is an aqueous solution prepared by mixing sodium sulfite and ammonium persulfate in a mass ratio of 1:1, and the total mass fraction of sodium sulfite and ammonium persulfate in the aqueous solution is 5%;

[0058] Step 3: Mix the first color fixing agent component and the second color fixing agent component in a mass ratio of 2:1, and stir to obtain a water-resistant and chlorine-resistant color fixing agent.

[0059] Example 3

[0060] Step 1:

[0061] Step A1: Add a linear polyethyleneimine aqueous solution (concentration of 50%, molecular weight of 20,000-50,000) into a flask while stirring;

[0062] Step A2: Control the temperature at 35°C, add epichlorohydrin dropwise to the polyethyleneimine aqueous solution at a mass ratio of 1:1, keep the temperature for 2.5 hours, and control the temperature at 72°C;

[0063] Step A3: cooling during the heat preservation and adjusting the pH value to 6.75±0.25 with glacial acetic acid to obtain a first color fixing component;

[0064] Step 2: diallylamine and dimethyldiallylammonium chloride are added into a flask in a nitrogen atmosphere at a molar ratio of 15:100, and then the pH value is adjusted to 4-5, and the mixture is heated to 80°C, an initiator is added, the reaction is carried out for 4.5 hours, and the mixture is cooled to obtain a second color fixing component;

[0065] The initiator is an aqueous solution prepared by mixing sodium sulfite and ammonium persulfate in a mass ratio of 1:1, and the total mass fraction of sodium sulfite and ammonium persulfate in the aqueous solution is 5%;

[0066] Step 3: Mix the first color fixing agent component and the second color fixing agent component in a mass ratio of 3:1, and stir to obtain a water-resistant and chlorine-resistant color fixing agent.

[0067] Example 4

[0068] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0069] Diallylamine and acrylamide were added into a flask in a nitrogen atmosphere at a molar ratio of 15:4, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0070] Example 5

[0071] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0072] Acrylamide and dimethyldiallylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 4:100, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0073] Example 6

[0074] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0075] Diallylamine, acrylamide and dimethyldiallylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 15:4:100, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0076] Example 7

[0077] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0078] Diallylamine, acrylamide and dimethyldiallylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 20:5:103, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0079] Example 8

[0080] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0081] Diallylamine, acrylamide and dimethyldiallylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 25:15:110, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0082] Example 9

[0083] The method is basically the same as Example 1, except that the second color fixing component is a commercially available polyurethane color fixing agent.

[0084] Example 10

[0085] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0086] Diallylamine, acrylamide and acryloyloxyethyltrimethylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 20:5:103, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0087] Embodiment 11

[0088] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0089] Diallylamine, acrylamide and methacryloyloxyethyltrimethylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 20:5:103, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0090] Comparative Example 1

[0091] Step A1: Add a linear polyethyleneimine aqueous solution (concentration of 50%, molecular weight of 20,000-50,000) into a flask while stirring;

[0092] Step A2: Control the temperature at 20°C, add epichlorohydrin dropwise to the polyethyleneimine aqueous solution at a mass ratio of 1:1, keep the temperature for 3 hours, and control the temperature at 70°C;

[0093] Step A3: Cool during the heat preservation and adjust the pH value to 6.75±0.25 with glacial acetic acid to obtain a color fixing agent.

[0094] Comparative Example 2

[0095] Diallylamine and dimethyldiallylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 15:100, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80° C., an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a color fixing agent.

[0096] Comparative Example 3

[0097] Diallylamine, acrylamide and dimethyldiallylammonium chloride were added into a flask in a nitrogen atmosphere at a molar ratio of 20:5:103, and then the pH value was adjusted to 4.5±0.5. At the same time, the mixture was heated to 80°C, an initiator was added, the reaction was continued for 4 hours, and the mixture was cooled to obtain a second color fixing component.

[0098] Comparative Example 4

[0099] The method is basically the same as Example 1, except that the mass ratio of the first color-fixing component to the second color-fixing component is 1:1.

[0100] Comparative Example 5

[0101] The method is basically the same as Example 1, except that the mass ratio of the first color-fixing component to the second color-fixing component is 4:1.

[0102] Comparative Example 6

[0103] The method is basically the same as Example 1, except that step 2 is specifically as follows:

[0104] Step 2: anionic acidic color fixing agent 1 and anionic acidic color fixing agent 2 are added into a flask in a nitrogen atmosphere at a molar ratio of 15:100, and then the pH value is adjusted to 4.5±0.5, and the mixture is heated to 80° C., an initiator is added, the mixture is reacted for 4 hours, and the mixture is cooled to obtain a second color fixing product;

[0105] The anionic acidic fixing agent 1 is Mesitol BFN, purchased from Shanghai Tuona Chemical New Materials Co., Ltd.

[0106] Anionic acidic fixing agent 2 is VJ892F, purchased from Dongguan Xiangtao High-tech Materials Technology Co., Ltd.

[0107] Test method:

[0108] The blue cotton knitted fabric (dye concentration is 7%) is padded to a residual rate of 85%, and then dried at 120-160°C. The dried red cotton knitted fabric is then passed through 1% to 3% (relative to the weight of the fabric) of a fixing agent and tested according to the following standards:

[0109] 1. Soap fastness is tested according to GB / T420-90 (grade 1-5, grade 5 is the best);

[0110] 2. Chlorine fastness is tested according to AATCC61-4A-2010 standard.

[0111] The test results are shown in Table 2:

[0112] Table 2

[0113]

[0114]

[0115] Result analysis:

[0116] 1. It can be seen from Examples 1-3 that when some process parameters in the preparation process of the fixing agent are changed, the chlorine fastness, soap fastness, and chlorine fastness of the fabric samples after soaping in Examples 1-3 show a certain degree of change trend, but the overall change range is small;

[0117] 2. Further observation of Example 1 and Example 4-5 shows that when the second color fixing component prepared by diallylamine and acrylamide or the second color fixing component prepared by acrylamide and dimethyldiallyl ammonium chloride is used to replace the second color fixing component prepared by diallylamine and dimethyldiallyl ammonium chloride in Example 1, the chlorine fastness, soap fastness, and chlorine fastness of the fabric sample after soaping of Examples 4 and 5 have a certain degree of change trend, but Examples 4-5 have advantages and disadvantages relative to Example 1 in the three test directions of chlorine fastness, soap fastness, and chlorine fastness of the fabric sample after soaping, and the gap is small. It can be seen that the comprehensive color fixing effect achieved by Examples 4-5 is equivalent to that of Example 1;

[0118] 3. Further observation of Examples 6-8 shows that when Example 6-8 uses diallylamine, acrylamide and dimethyldiallylammonium chloride to prepare the second color fixing component, even Example 6 with poor color fixing effect has the same chlorine fastness as Example 1 after soaping, while the chlorine fastness and soaping fastness are significantly improved;

[0119] It can be seen that when diallylamine, acrylamide and dimethyldiallylammonium chloride are compounded, the color fixing effect of the color fixing agent can be significantly improved;

[0120] Further observation of Example 6 and Examples 1, 4, and 5 shows that when Examples 1, 4, and 5 respectively use diallylamine and dimethyldiallylammonium chloride; diallylamine and acrylamide; acrylamide and dimethyldiallylammonium chloride to prepare the second color fixing component, the performance difference between the three is not large. Therefore, in theory, when Example 6 uses diallylamine, acrylamide, and dimethyldiallylammonium chloride in combination, its color fixing effect should be equivalent to that of Examples 1, 4, and 5.

[0121] However, it can be seen from Table 2 that the color fixing effect is obvious. The reason for this phenomenon in Examples 1, 4, and 5 may be that diallylamine, acrylamide, and dimethyldiallylammonium chloride produce a synergistic effect when used together, so that the color fixing agent crosslinks into a network film on the fabric surface and is tightly combined with the fabric. On the one hand, the adhesion of the color fixing agent on the fabric surface is enhanced, thereby improving the soap washing resistance and chlorine resistance. On the other hand, it also provides excellent durability for the fabric against the erosion of active chlorine.

[0122] At the same time, it can be seen from Examples 6-8 that when the molar ratio of diallylamine, acrylamide, and dimethyldiallyl ammonium chloride is 20:5:103, the soap fastness of Example 7 and the chlorine fastness of the fabric sample after soaping are improved relative to Examples 6 and 8. It can be seen that when the molar ratio of diallylamine, acrylamide, and dimethyldiallyl ammonium chloride is 20:5:103, the cross-linked network film of the color fixing agent on the surface of the fabric has a stronger adhesion to the fabric;

[0123] 4. It can be seen from Examples 1 and 9 that when polyurethane is used as the second color-fixing component, the difference between Example 9 and Example 1 is not large. Further observation of Examples 10-11 shows that when Examples 10-11 use diallylamine, acrylamide, acryloyloxyethyl trimethyl ammonium chloride as the second color-fixing component or use diallylamine, acrylamide, methacryloyloxyethyl trimethyl ammonium chloride as the second color-fixing component, Examples 10-11 have a certain degree of improvement over Example 1, but the improvement is far less than any of Examples 6-8;

[0124] 5. It can be seen from Example 1 and Comparative Examples 1-3 that when the color fixing agent consists only of the first color fixing component or only of the second color fixing component, the chlorine fastness, soap washing fastness, and chlorine fastness of the fabric samples after soaping of Comparative Examples 1-3 all show a significant downward trend relative to Example 1. It can be seen that when only the first color fixing component or only the second color fixing component is used, it is difficult for the color fixing agent to generate a cross-linked network structure on the fabric surface, and it is difficult to significantly improve the color fixing effect.

[0125] 6. It can be seen from Example 1 and Comparative Examples 4-6 that, on the one hand, when the ratio between the first color fixing component and the second color fixing component is greatly changed, the chlorine fastness, soap washing fastness, and chlorine fastness of the cloth sample after soaping of Comparative Examples 4-5 all show a significant downward trend relative to Example 1. It can be seen that when the first color fixing component and the second color fixing component are greatly changed, the cross-linked network structure that should have been attached to the surface of the fabric is destroyed, which leads to a decrease in the color fixing effect; and when Comparative Example 6 uses the second color fixing component made of anionic color fixing agent, the chlorine fastness, soap washing fastness, and chlorine fastness of the cloth sample after soaping of Comparative Example 6 show a relatively obvious gap relative to Example 1. It can be seen that the second color fixing component made of anionic color fixing agent is difficult to generate a cross-linked network structure on the fabric surface together with the first color fixing component.

[0126] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A washable and chlorine-resistant color fixing agent, characterized in that: It comprises a first color-fixing component and a second color-fixing component, wherein the mass ratio of the first color-fixing component to the second color-fixing component is 1.5 to 3:1; The first color fixing component is obtained by polymerization of polyethyleneimine and epichlorohydrin; The second color fixing component is a polyurethane color fixing agent or is obtained by polymerizing at least two cationic color fixing agents; The cationic color fixing agent is a cationic color fixing agent containing nitrogen; The polyurethane color fixing agent is a polyurethane color fixing agent with -NCO as the end-capping group.

2. The washable and chlorine-resistant color fixing agent according to claim 1, characterized in that: The second color-fixing component is obtained by polymerizing at least two cationic color-fixing agents.

3. The washable and chlorine-resistant color fixing agent according to claim 1, characterized in that: The cationic color fixing agent is selected from diallylamine, acrylamide, dimethyldiallylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, and acryloyloxyethyltrimethylammonium chloride.

4. The washable and chlorine-resistant color fixing agent according to claim 1, characterized in that: The second color fixing agent is obtained by polymerizing diallylamine, acrylamide and dimethyldiallyl ammonium chloride, and the molar ratio of diallylamine, acrylamide and dimethyldiallyl ammonium chloride is 15-25:4-15:100-110.

5. The washable and chlorine-resistant color fixing agent according to claim 1, characterized in that: The water-washable and chlorine-resistant color fixing agent does not precipitate solid matter within 30 days under an environment of 5°C.

6. A method for preparing the water-washable and chlorine-resistant color fixing agent according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: mixing and polymerizing polyethyleneimine and epichlorohydrin to obtain a first color fixing component; Step 2: mixing, polymerizing or weighing at least two cationic color fixing agents with a polyurethane color fixing agent to obtain a second color fixing component; Step 3: Mix the first color fixing component and the second color fixing component in a mass ratio of 1.5 to 3:1 to obtain a water-resistant and chlorine-resistant color fixing agent.

7. The method for preparing the washable and chlorine-resistant color fixing agent according to claim 6, characterized in that: The step 1 includes the following sub-steps: Step A1: Add polyethyleneimine into a flask while stirring and heating; Step A2: Control the temperature at 20-50°C, add epichlorohydrin dropwise to polyethyleneimine, keep warm for 2-3 hours, and control the temperature at 70-75°C; Step A3: Cool during heat preservation and adjust the pH value to 6.5-7.5 with glacial acetic acid to obtain a first color-fixing component.

8. The method for preparing the washable and chlorine-resistant color fixing agent according to claim 6, characterized in that: The step 2 specifically comprises: adding at least two cationic color-fixing agents into a flask in a nitrogen atmosphere, then adjusting the pH value to 4-5, heating to 80° C., adding initiators respectively, reacting for 2-3 hours, and cooling to obtain a second color-fixing component; The initiator is an aqueous solution of ammonium persulfate and sodium bisulfite.

9. The method for preparing the washable and chlorine-resistant color fixing agent according to claim 6, characterized in that: The step 3 specifically comprises: mixing the first color fixing agent component and the second color fixing agent component at a mass ratio of 1.5 to 3:1, and stirring to obtain a water-resistant and chlorine-resistant color fixing agent.

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