Color-fixing printing and dyeing method for pure-color fabric

Abstract

The invention relates to the field of spinning, and particularly discloses a color fixing, printing and dyeing method for a pure-color fabric. The color fixing, printing and dyeing method for the pure-color fabric comprises the following specific steps: pretreatment: desizing, boiling, bleaching and drying the pure-color fabric; printing and dyeing treatment: heating the pretreated pure-color fabric to 60-70 DEG C by using a dye mixed solution for printing and dyeing, maintaining the pH value of the dye mixed solution at 6-7 in the printing and dyeing process, rinsing the fabric after dyeing is completed, and carrying out twice-dipping twice-rolling treatment after rinsing; fixation treatment: dipping the fabric subjected to printing and dyeing treatment in a coupling agent aqueous solution, carrying out ultrasonic dispersion, taking out the fabric, washing and drying the fabric, dipping the fabric in a fixation mixture, and carrying out heating fixation treatment; post-treatment: shaping the fabric subjected to color fixation by using hot steam, and drying to obtain a printed and dyed fabric; according to the method, all the process steps are combined, the fabric printing and dyeing effect and the color fixing effect are improved, and fabric printing and dyeing have good color fastness.

Description

Technical Field

[0001] The present application relates to the field of textiles, and in particular to a color fixing printing and dyeing method for solid color fabrics. Background Art

[0002] Textile printing and dyeing technology is an important part of the modern textile industry and is widely used in many fields such as clothing and household goods. As consumers' requirements for product quality and environmental protection continue to increase, printing and dyeing technology is also constantly improving. Although traditional printing and dyeing processes can meet basic dyeing needs, they still have shortcomings in color brightness, color fastness and environmental performance. In recent years, in order to improve the quality and market competitiveness of printing and dyeing products, various new printing and dyeing technologies and equipment have emerged, such as ultrasonic-assisted printing and dyeing, low-temperature plasma treatment, etc. These new technologies not only improve printing and dyeing efficiency, but also significantly improve dyeing effects and environmental performance.

[0003] In traditional printing and dyeing, the commonly used methods include pad dyeing and jet dyeing. Pad dyeing mainly uses dye liquor immersion and pressure rollers to evenly distribute the dye on the fabric surface, and jet dyeing mainly uses high-pressure nozzles to spray the dye liquor onto the fabric to achieve fast and uniform dyeing. However, these traditional printing and dyeing methods do not have a strong binding force between the pigment and the fabric fiber, resulting in a low pigment load, which in turn makes the pigment easily washed away by washing or friction, and has poor color fastness, which in turn affects product quality. Summary of the invention

[0004] In order to improve the printing and dyeing effect of fabric printing and dyeing, the present application provides a solid color printing and dyeing method for solid color fabrics.

[0005] The present application provides a method for fixing color of solid color fabrics, which adopts the following technical solution: A color fixing printing and dyeing method for solid color fabrics comprises the following specific steps: Pretreatment: desizing, scouring, bleaching and drying of solid color fabrics; Printing and dyeing treatment: Use the dye mixture after pretreatment to heat the solid color fabric to 60-70℃ for printing and dyeing. During the printing and dyeing process, the pH value of the dye mixture is maintained at 6-7. After dyeing, the fabric is rinsed and then subjected to two-immersion and two-rolling treatments; Color fixing treatment: immerse the printed and dyed fabric in a coupling agent aqueous solution, and after ultrasonic dispersion, take out the fabric, then wash and dry the fabric, and then immerse the fabric in a color fixing mixture and heat for color fixing treatment; Post-treatment: Use hot steam to shape the fabric after color fixation, and then dry it to obtain the printed and dyed fabric; The dye mixture comprises the following raw materials in parts by weight: 8-12 parts of high molecular polymer ink, 5-8 parts of dispersant, 1-3 parts of sodium carbonate, 3-5 parts of leveling agent, 3-5 parts of cross-linking agent and pH buffer.

[0006] By adopting the above technical scheme, the solid color fabric is first desized, scour, bleached and pretreated, so as to remove the sizing, natural impurities and chroma on the fabric, improve the whiteness and color absorption ability of the fabric, and improve the subsequent dyeing effect.

[0007] During the printing and dyeing process, timely adjusting the pH of the dye mixture within the appropriate range can promote the uniform dispersion of ink pigment particles, reduce particle agglomeration, and thus improve the uniformity and quality of printing and dyeing colors. Maintaining the pH of the dye mixture at 6-7 ensures that the dye is combined with the fabric fiber under neutral or slightly acidic conditions, reduces the phenomenon of dye decomposition under over-alkali or over-acid conditions, and improves the color fastness and stability of fabric printing and dyeing. By combining rinsing with two immersions and two rollings, the unbound dye, moisture and impurities on the surface of the fabric fiber can be removed, preventing the dye from re-depositing in subsequent treatments, affecting the uniformity and color fastness of the fabric color, while making the fabric surface smoother and improving the subsequent color fixation effect of the fabric.

[0008] First, connect the coupling agent to the fabric fibers, and then use the fixing mixture. The coupling agent is used as a bridge to strengthen the binding force between the fixing mixture and the fibers, allowing the fixing mixture to form a polymer film on the dye surface, reducing the shedding and degradation of the dye, thereby improving the fixing effect and the color fastness of the fabric.

[0009] Using high molecular polymer ink in the dye mixture can better penetrate into the fibers of the fabric, and a lower concentration can also achieve a better coverage effect, making the color of the printed fabric more saturated and longer lasting. The polymer component of the high molecular polymer ink can increase the adhesion between the dye and the fabric, has strong adhesion, fixes the dye on the surface of the fabric fiber, and improves the color fixing effect. High molecular polymer ink has good temperature resistance, can maintain the dimensional stability and strength of the fabric during the printing and dyeing process, reduce the curing temperature of the dye, reduce thermal damage to the fabric, and at the same time improve the washability and wear resistance of the fabric, extending the service life of the fabric.

[0010] Preferably, the high molecular polymer ink comprises the following raw materials in parts by weight: 30-40 parts of polybutylene glycol, 20-30 parts of 2,2-bis(hydroxymethyl)propionic acid, 5-8 parts of solvent, 30-40 parts of isocyanate, 1-3 parts of catalyst, 1-3 parts of 1,4-butanediol, and 1-3 parts of neutral dye.

[0011] By adopting the above technical solution, polybutylene glycol, 2,2-bis(hydroxymethyl)propionic acid and isocyanate react to form a polyurethane network, introduce neutral dyes into the polymer network, enhance the adhesion between the dye and the fabric fiber, and enable the dye mixture to be firmly bonded to the fabric surface, thereby improving the color fastness and printing and dyeing effect of the fabric. At the same time, the polymer network structure generated by the reaction of polybutylene glycol, 2,2-bis(hydroxymethyl)propionic acid and isocyanate, under the action of 1,4-butanediol, the polymer molecular chain is extended, so that the prepared polymer ink has better viscosity and flexibility, stronger intermolecular forces, more uniform dispersion, and effectively reduces the stratification phenomenon of the polymer ink. During the dyeing process, the polymer ink is firmly bonded to the surface of the fiber, so that the surface of the fabric has a uniform and firm dyeing effect.

[0012] Preferably, the neutral dye is a neutral dye with anthraquinone groups.

[0013] By adopting the above technical solution, the neutral dye with anthraquinone group has good acid and alkali resistance, is not easy to fade during washing and processing, and prolongs the dyeing effect of the fabric. The neutral dye with anthraquinone group can react chemically or physically with the active groups on the fiber surface to form a strong bond, can be evenly dispersed in the high molecular polymer ink, and then form a uniform and strong dyeing effect on the fabric surface, maintaining the durability of the fabric color.

[0014] Preferably, the method for preparing the high molecular polymer ink comprises the following specific steps: Polybutylene glycol, 2,2-bis(hydroxymethyl)propionic acid, 1,4-butanediol and solvent are mixed, heated to 80-90°C, isocyanate, catalyst and neutral dye are added to react, the neutralization degree of the reaction system is adjusted, water is added to disperse and emulsify, and a high molecular polymer ink is obtained.

[0015] Preferably, the pH buffer is one of acetic acid-sodium acetate and citric acid-sodium citrate.

[0016] Preferably, the dispersant is at least one of ethylene glycol butyl ether and propylene carbonate, and the cross-linking agent is trihydroxymethylpropane.

[0017] By adopting the above technical solution, ethylene glycol butyl ether and propylene carbonate as dispersants can promote the uniform dispersion of the dye mixture, reduce the phenomenon of pigment particles agglomerating into clumps, and reduce the phenomenon of uneven printing and dyeing colors. Adding an appropriate amount of dispersant to the dye mixture can form a protective layer between the dyes, reduce direct contact or adhesion between dye particles, maintain a good dispersion state, and improve printing and dyeing quality. Trihydroxymethylpropane can promote the formation of a strong chemical bond connection between fabric molecules and the dye mixture, reduce the fading or discoloration of fabric pigments, and improve the color fixation effect of dyes on the fabric surface.

[0018] Preferably, the color fixing mixture comprises the following raw materials in parts by weight: 40-50 parts of water, 20-25 parts of triethylenetetramine, and 8-12 parts of epichlorohydrin.

[0019] By adopting the above technical solution, triethylenetetramine and epichlorohydrin can react to generate a polyamine-type color fixing agent with cationic properties, which can block the water-soluble groups of the dye and cross-link with the active groups such as hydroxyl groups on the dye and fiber, thereby improving the adhesion of the dye to the fiber and enhancing the color fastness. On the other hand, when the fabric is washed, the amino groups generated by the reaction of the color fixing mixture can react with the chlorine molecules in the water, thereby reducing the degradation and destruction of the dye molecules, thereby improving the rinsing color fastness and color fixing effect of the fabric.

[0020] Preferably, the method for preparing the color fixing mixture comprises the following specific steps: Mix triethylenetetramine and water, heat to 50-60°C, then drop epichlorohydrin into the mixture and stir evenly. Keep the mixture warm for reaction and adjust the pH of the reaction system to neutral to obtain a color fixing mixture.

[0021] In summary, this application has the following beneficial effects: 1. Since the present application adopts the method of maintaining the pH of the dye mixture at 6-7 during the printing and dyeing process, the phenomenon of dye decomposition under over-alkali and over-acid conditions is reduced, and the color fastness and color durability of the fabric color are improved. After the fabric is printed and dyed, a coupling agent is used to enhance the binding force between the color fixing mixture and the fiber, so that the color fixing mixture can form a polymer protective film on the dye surface, enhance the binding force between the dye and the fabric fiber, reduce the phenomenon of dye shedding and degradation, and thus improve the color fixing effect and printing and dyeing effect of the fabric.

[0022] 2. In the present application, polybutylene glycol, 2,2-bis(hydroxymethyl)propionic acid and isocyanate are used in the dye mixture raw materials to react and form a high molecular polymer ink, which can better penetrate into the fabric fibers at a lower concentration. The strong adhesion of the polymer can enhance the adhesion between the dye and the fabric, firmly fix the dye on the surface of the fabric fiber, and improve the printing and dyeing effect and the color fixing effect of the fabric. DETAILED DESCRIPTION

[0023] The present application is further described in detail below with reference to the embodiments.

[0024] All raw materials in the examples are commercially available.

[0025] Preparation example of polymer ink Preparation Example 1 The high molecular polymer ink includes the following raw materials in parts by weight: 35 kg of polybutylene glycol, 25 kg of 2,2-bis(hydroxymethyl)propionic acid, 7 kg of solvent, 35 kg of isocyanate, 2 kg of catalyst, 2 kg of 1,4-butanediol, and 2 kg of neutral dye. The molecular weight of polybutylene glycol is 1000, the isocyanate is isophorone diisocyanate, the solvent is N-methylpyrrolidone, the catalyst is dibutyltin dilaurate, and the neutral dye is neutral brilliant blue S-5GL.

[0026] The preparation method of high molecular polymer ink comprises the following specific steps: Mix polybutylene glycol, 2,2-bis(hydroxymethyl)propionic acid, 1,4-butanediol and solvent, stir evenly, heat to 85°C, add isocyanate, catalyst and neutral dye to react for 4 hours, cool to 60°C, use triethylamine to adjust the neutralization degree of the reaction system, add water to disperse and emulsify, and obtain a high molecular polymer ink.

[0027] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 is that the amount of polybutylene glycol used in the high molecular polymer ink raw material is 30 kg, the amount of 2,2-bis(hydroxymethyl)propionic acid used is 30 kg, the amount of solvent used is 5 kg, the amount of isocyanate used is 30 kg, the amount of catalyst used is 1 kg, the amount of 1,4-butanediol used is 1 kg, and the amount of neutral dye used is 1 kg.

[0028] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 is that the amount of polybutylene glycol used in the high molecular polymer ink raw material is 40 kg, the amount of 2,2-bis(hydroxymethyl)propionic acid used is 20 kg, the amount of solvent used is 8 kg, the amount of isocyanate used is 40 kg, the amount of catalyst used is 3 kg, the amount of 1,4-butanediol used is 3 kg, and the amount of neutral dye used is 3 kg.

[0029] Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that the neutral dye in the high molecular polymer ink raw material is CI Reactive Blue KN-R. Example

[0030] Example 1 This embodiment provides a solid color printing and dyeing method for solid color fabrics, comprising the following specific steps: S1 Pretreatment: Desizing and scouring of solid color fabrics, bleaching with hydrogen peroxide and then drying.

[0031] S2 printing and dyeing treatment: polymer ink, dispersant, alkali agent, leveling agent and cross-linking agent are mixed and stirred to form a dye mixture; the pre-treated solid color fabric is immersed in the dye mixture, and the mixture is dyed at 65°C with a bath ratio of 1:15 for 30 minutes. During the printing and dyeing process, a pH buffer is used to maintain the pH of the dye mixture at 6.5. After dyeing, the fabric is rinsed with water twice, and the rinsed fabric is subjected to two-immersion and two-rolling treatments at a speed of 30m / min; The raw materials of the dye mixture are as follows in parts by weight: 10 kg of high molecular polymer ink, 7 kg of dispersant, 2 kg of alkali agent, 4 kg of leveling agent, 4 kg of cross-linking agent and pH buffer; the high molecular polymer ink comes from Preparation Example 1, the dispersant is ethylene glycol butyl ether, the alkali agent is sodium carbonate, the leveling agent is alkylphenol polyoxyethylene ether, the cross-linking agent is trihydroxymethylpropane, and the pH buffer is acetic acid-sodium acetate.

[0032] S3 color fixing treatment: immerse the printed and dyed fabric in a 10% aqueous solution of N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane, ultrasonically disperse for 30 minutes, take out the fabric, and then wash and dry the fabric; mix triethylenetetramine and water, heat to 55°C, drop epichlorohydrin into the mixture and stir evenly, keep warm for 30 minutes, use acetic acid to adjust the pH of the reaction system to neutral, obtain a color fixing mixture, and then immerse the fabric in a mixture of the color fixing mixture and water, the concentration of the color fixing mixture is 10g / L, the bath ratio is 1:12, and heat to 70°C for color fixing treatment for 30 minutes; The weight proportions of the raw materials of the color fixing mixture are as follows: 45 kg of water, 23 kg of triethylenetetramine, and 10 kg of epichlorohydrin.

[0033] S4 post-treatment: Use hot steam to shape the fabric after color fixation, and then dry it to obtain the printed and dyed fabric.

[0034] Example 2 The difference between Example 2 and Example 1 is that the amount of high molecular polymer ink used in the dye mixture raw material is 8kg, the amount of dispersant used is 5kg, the amount of alkali agent used is 1kg, the amount of leveling agent used is 3kg, and the amount of cross-linking agent used is 3kg.

[0035] Example 3 The difference between Example 3 and Example 1 is that the amount of high molecular polymer ink used in the dye mixture raw material is 12kg, the amount of dispersant used is 8kg, the amount of alkali agent used is 3kg, the amount of leveling agent used is 5kg, and the amount of cross-linking agent used is 5kg.

[0036] Example 4 The difference between Example 4 and Example 1 is that the high molecular polymer ink in the dye mixture raw material comes from Preparation Example 2.

[0037] Example 5 The difference between Example 5 and Example 1 is that the high molecular polymer ink in the dye mixture raw material comes from Preparation Example 3.

[0038] Example 6 The difference between Example 6 and Example 1 is that the high molecular polymer ink in the dye mixture raw material comes from Preparation Example 4.

[0039] Example 7 The difference between Example 7 and Example 6 is that the pH buffer in the dye mixture raw material is citric acid-sodium citrate.

[0040] Example 8 The difference between Example 8 and Example 6 is that the amount of water used in the raw materials of the color fixing mixture package is 40 kg, the amount of triethylenetetramine used is 20 kg, and the amount of epichlorohydrin used is 8 kg.

[0041] Example 9 The difference between Example 9 and Example 6 is that the amount of water used in the raw materials of the color fixing mixture package is 50 kg, the amount of triethylenetetramine used is 25 kg, and the amount of epichlorohydrin used is 12 kg.

[0042] Comparative Example Comparative Example 1 Comparative Example 1 provides a solid color printing and dyeing method for solid color fabrics, comprising the following specific steps: S1 Pretreatment: Desizing and scouring of solid color fabrics, bleaching with hydrogen peroxide and then drying.

[0043] S2 printing and dyeing treatment: polymer ink, dispersant, alkali agent, leveling agent and cross-linking agent are mixed and stirred to form a dye mixture; the pre-treated solid color fabric is immersed in the dye mixture, and the bath ratio is 1:15 at 65°C and the temperature is kept for dyeing for 30 minutes. During the printing and dyeing process, a pH buffer is used to maintain the pH of the dye mixture at 6.5. After dyeing, it is rinsed with water twice. The rinsed fabric is subjected to two immersion and two rolling treatments at a speed of 30m / min; The raw materials of the dye mixture are as follows in parts by weight: 10 kg of high molecular polymer ink, 7 kg of dispersant, 2 kg of alkali agent, 4 kg of leveling agent, 4 kg of cross-linking agent and pH buffer; the high molecular polymer ink comes from Preparation Example 1, the dispersant is ethylene glycol butyl ether, the alkali agent is sodium carbonate, the leveling agent is alkylphenol polyoxyethylene ether, the cross-linking agent is trihydroxymethylpropane, and the pH buffer is acetic acid-sodium acetate.

[0044] S3 color fixing treatment: Mix triethylenetetramine and water, heat to 55°C, then drop epichlorohydrin and stir evenly, keep warm for 30 minutes, use acetic acid to adjust the pH of the reaction system to neutral, and obtain a color fixing mixture. Then immerse the fabric in the mixture of the color fixing mixture and water. The concentration of the color fixing mixture is 10g / L, the bath ratio is 1:12, and heat to 70°C for 30 minutes; The weight proportions of the raw materials of the color fixing mixture are as follows: 45 kg of water, 23 kg of triethylenetetramine, and 10 kg of epichlorohydrin.

[0045] S4 post-treatment: Use hot steam to shape the fabric after color fixation, and then dry it to obtain the printed and dyed fabric.

[0046] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the dye mixture in the solid color printing and dyeing method of solid color fabrics is a neutral dye - neutral brilliant blue S-5GL, and the concentration of the dye mixture is 4%.

[0047] Performance testing According to the solid color printing and dyeing method for solid color fabrics provided in Examples 1-9 and Comparative Examples 1-2 of the present application, the fabrics were printed and dyed, and then the following performance tests were performed. The specific test results are shown in Table 1.

[0048] Detection Methods 1. Fixation rate The absorbance of the dye mixture after printing and dyeing of the solid color fabric in the present application is measured, the dye concentration in the dye mixture is calculated according to the standard curve of the dye, and the dye utilization rate is calculated according to the formula: fixation rate = (dye concentration in the dye aqueous solution before printing and dyeing - dye concentration in the dye aqueous solution after printing and dyeing) / dye concentration in the dye aqueous solution before printing and dyeing * 100%.

[0049] 2. Color fastness With reference to the standard of GB / T 3920-2008 "Textiles - Tests for Color Fastness - Color Fastness to Rubbing", the color fastness of the solid color fabrics of this application after printing and dyeing using the printing and dyeing method of this application is tested. With reference to the standard of GB / T 3921-2008 "Textiles - Tests for Color Fastness - Color Fastness to Washing", the color fastness of the solid color fabrics after printing and dyeing using the printing and dyeing method of this application is tested.

[0050] Table 1: Performance test results data table It can be seen from the performance test results that the color fixing printing and dyeing method of the solid color fabric used in the present application has a good color fixing effect and printing and dyeing effect after the fabric is printed and dyed. By comparing the comparative examples 1-2 and Example 1, it can be seen that the fabric after dyeing in the comparative example 1 is directly fixed without using a coupling agent treatment. In the comparative example 2, conventional neutral dyes are used instead of the polymer ink prepared by the present application. It can be seen from the performance test results that the fabric printing and dyeing effect is significantly reduced, and the color durability of the fabric printing and dyeing is reduced. At the same time, after soaping and friction tests, fading has occurred. It is further explained that the synergistic effect of each printing and dyeing process can promote the dye to be evenly and firmly combined on the surface of the fabric fiber, and at the same time, a protection and color fixing effect is formed between the dye and the fabric, and the color fastness of the fabric color is improved. At the same time, the polymer ink prepared by the present application utilizes its own polymer network structure, and is combined with other auxiliary components such as cross-linking agents and leveling agents to further improve the color fixing effect and dyeing effect of the fabric, and promote the dye to be evenly and firmly attached to the fabric surface, and improve the durability and uniformity of the fabric color.

[0051] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A color fixing printing and dyeing method for solid color fabrics, characterized in that: The specific steps include: Pretreatment: desizing, scouring, bleaching and drying of solid color fabrics; Printing and dyeing treatment: Use the dye mixture after pretreatment to heat the solid color fabric to 60-70℃ for printing and dyeing. During the printing and dyeing process, the pH value of the dye mixture is maintained at 6-7. After dyeing, the fabric is rinsed and then subjected to two-immersion and two-rolling treatments; Color fixing treatment: immerse the printed and dyed fabric in a coupling agent aqueous solution, and after ultrasonic dispersion, take out the fabric, then wash and dry the fabric, and then immerse the fabric in a color fixing mixture and heat for color fixing treatment; Post-treatment: Use hot steam to shape the fabric after color fixation, and then dry it to obtain the printed and dyed fabric; The dye mixture comprises the following raw materials in parts by weight: 8-12 parts of high molecular polymer ink, 5-8 parts of dispersant, 1-3 parts of alkali agent, 3-5 parts of leveling agent, 3-5 parts of cross-linking agent and pH buffer.

2. The color fixing printing and dyeing method for pure color fabrics according to claim 1, characterized in that: The high molecular polymer ink comprises the following raw materials in parts by weight: 30-40 parts of polybutylene glycol, 20-30 parts of 2,2-bis(hydroxymethyl)propionic acid, 5-8 parts of solvent, 30-40 parts of isocyanate, 1-3 parts of catalyst, 1-3 parts of 1,4-butanediol and 1-3 parts of neutral dye.

3. The color fixing printing and dyeing method for pure color fabrics according to claim 2, characterized in that: The neutral dye is a neutral dye with anthraquinone groups.

4. The color fixing printing and dyeing method for pure color fabrics according to claim 2, characterized in that: The preparation method of the high molecular polymer ink comprises the following specific steps: Polybutylene glycol, 2,2-bis(hydroxymethyl)propionic acid, 1,4-butanediol and solvent are mixed, heated to 80-90°C, isocyanate, catalyst and neutral dye are added to react, the neutralization degree of the reaction system is adjusted, water is added to disperse and emulsify, and a high molecular polymer ink is obtained.

5. The color fixing printing and dyeing method for pure color fabrics according to claim 1, characterized in that: The pH buffer is one of acetic acid-sodium acetate and citric acid-sodium citrate.

6. The color fixing printing and dyeing method for pure color fabrics according to claim 1, characterized in that: The dispersant is at least one of ethylene glycol butyl ether and propylene carbonate, and the cross-linking agent is trihydroxymethylpropane.

7. The color fixing printing and dyeing method for pure color fabrics according to claim 1, characterized in that: The color fixing mixture comprises the following raw materials in parts by weight: 40-50 parts of water, 20-25 parts of triethylenetetramine, and 8-12 parts of epichlorohydrin.

8. The color fixing printing and dyeing method for pure color fabrics according to claim 7, characterized in that: The method for preparing the color fixing mixture comprises the following specific steps: Mix triethylenetetramine and water, heat to 50-60°C, then drop epichlorohydrin into the mixture and stir evenly. Keep the mixture warm for reaction and adjust the pH of the reaction system to neutral to obtain a color fixing mixture.

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