Dyeing process for improving dyeing fastness of alginate fibers

Abstract

The invention discloses a dyeing process for improving the dyeing fastness of alginate fibers, which comprises the following steps: 1) pretreatment: adding a defoaming agent I and a degreaser into clear water, putting the alginate fibers to cooperate with ultrasonic treatment, and then carrying out alternate cooling and heating treatment on the alginate fibers; the method comprises the following steps of 1, dyeing, 2, dyeing: injecting clear water into dyeing equipment, adding a defoaming agent II, a leveling agent and an accelerating agent, fully and uniformly running, adding a dye for dyeing, adding a color fixing agent, cooling to normal temperature, and washing with clear water, 3, soaping, and 4, neutralizing. The dyeing process is simple and mild, and the dyed fabric has good crockfastness, washing fastness and dye uptake.

Description

Technical Field

[0001] The present invention relates to the technical field of textile chemicals, and particularly relates to a dyeing process for improving the color fastness of seaweed fibers. Background Art

[0002] Seaweed fiber is a new type of biomass fiber prepared from alginic acid extracted from natural seaweeds by a specific spinning method. Alginic acid polysaccharide consists of two components, β-D-mannuronic acid and α-L-guluronic acid. The salts formed by alginic acid and most divalent and higher metal ions are insoluble in water. Therefore, sodium alginate can be dissolved in water to prepare a spinning dope, and then alginic acid fiber can be made by wet spinning. Usually, sodium alginate is used as the spinning matrix, and an aqueous solution containing metal ions such as Ca 2+ 、Cu 2+ 、Ba 2+ 、Zn 2+ is used as the coagulation bath, and it is prepared by the method of wet spinning. Divalent calcium ions are ionically bonded to the carboxylic acid groups on adjacent alginic acid molecular chains, and the calcium ions are surrounded between adjacent molecular chains to form an "eggbox" structure. Based on the characteristics of sodium alginate being non-toxic, flame-retardant and having good biocompatibility, seaweed fibers have significant advantages in terms of moisture absorption and breathability, antibacterial, flame-retardant, far-infrared, electromagnetic radiation protection, and biocompatibility and biodegradability. And its raw material is seaweed plants, with sufficient sources and being green and environmentally friendly. Based on these characteristics, seaweed fibers show great application potential in the textile and clothing fields.

[0003] Seaweed fibers have the following disadvantages: (1) Poor salt tolerance, reverse ion exchange: After contacting with a sodium ion-containing solution, some calcium ions in the calcium alginate fibers exchange with some sodium ions in the solution, resulting in an ion exchange process opposite to the fiber coagulation process and transforming into sodium alginate. Sodium alginate is soluble in water, so the fibers exhibit gel properties and release calcium ions. (2) Poor acid and alkali resistance: The stability of alginate fibers is poor under acid and alkali solution conditions. Zhu Ping, Wang Liu, etc. Structure and properties of calcium alginate fibers [J], Synthetic Fiber Industry, 2009, 32(6):1. mentioned the mass loss of calcium alginate fibers in acid and alkali solutions of different concentrations. It was found that the mass loss rate of calcium alginate fibers after being placed in 0.1 mol / L sulfuric acid and sodium hydroxide solutions at room temperature for 10 minutes was about 10%. If the temperature was raised to 30 °C, the mass loss rate was about 14%. (3) Poor dyeing performance: Some carboxyl groups in the molecular structure of seaweed fibers exist in the form of chelation with calcium ions. The fiber is negatively charged due to the ionization of this part of the carboxyl group in aqueous solution; while currently commonly used commercial dyes such as direct dyes, reactive dyes, acid dyes, and metal complex dyes are also negatively charged in aqueous solution. Under the repulsion of like charges, the dyeing rate of commonly used commercial dyes on seaweed fibers is relatively low, and the dyes are adsorbed on the surface of the seaweed fibers as floating colors, resulting in a light color and poor dyeing fastness. Summary of the Invention

[0004] The purpose of the present invention is to provide a dyeing process for improving the dyeing fastness of seaweed fibers.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: A dyeing process for improving the dyeing fastness of seaweed fibers, the dyeing process comprising the following steps: 1) Pretreatment 11) Add defoamer Ⅰ and degreasing agent to clear water, fully mix, adjust the pH value to 7 - 8.5 with ammonia water, put in seaweed fibers, heat up to 50 - 70 °C and cooperate with ultrasonic treatment for 10 - 30 minutes. The dosage of defoamer Ⅰ is 0.1 - 0.5 ml / L, the dosage of degreasing agent is 0.5 - 1.5 ml / L, and the power intensity of the ultrasonic wave is 0.5 - 1 W / cm 2 , and the frequency of the ultrasonic wave is 25 - 40 KHz; 12) Subject the seaweed fibers treated in step 11) to heat and cold alternating treatment. First, perform heat treatment in a water bath at 50 - 60 °C, and then perform cold treatment in a water bath at 5 - 10 °C. The heat and cold treatment time is 10 - 15 minutes each time. After 3 - 5 times of heat and cold alternating treatment, it ends; 2) Dyeing 21) After injecting clear water into the dyeing equipment, add defoamer II, leveling agent and accelerating agent, fully operate and mix evenly, adjust the pH value of the dye bath to 8 - 9, add the dye, and heat it up to 50 - 60 °C at a rate of 1.5 - 2 °C / min, and keep it warm for reaction for 30 - 50 min. Among them, the dye is a reactive dye, and the accelerating agent is an inorganic salt containing calcium ions, and the dosage is 1 - 5 g / L; 22) Adjust the pH value of the dye bath to 10 - 11, add the fixing agent, heat it up to 70 - 80 °C, and keep it warm for reaction for 20 - 30 min. The structural formula of the fixing agent is: R 1 -O-CH 2 CH(OH)CH 2 -N + (CH 3 ) 2 Cl - wherein, R 1 is selected from one of C 12 H 25 C 14 H 29 C 16 H 33 C 18 H 37 , and the dosage of the fixing agent is 1 - 2% o.w.f; 23) Cool down to room temperature and wash with clear water; 3) Soaping: Add a soaping agent to the dyeing equipment, heat it up to 80 - 100 °C and keep it warm for 10 - 30 minutes, and then wash it clean; 4) Neutralization: Add an acid agent to the dyeing equipment, operate for 10 minutes and then drain the water, and then dry it.

[0006] As a specific implementation method, the accelerating agent used in step 2) is the Fammanfeng NB series accelerating agent produced by Shanghai Yayun Textile Chemical Co., Ltd.

[0007] As a specific implementation method, the soaping agent used in step 3) is the Ivygard NW soaping agent produced by Huntsman Corporation.

[0008] As a specific implementation method, the acid agent is acetic acid or formic acid, and its dosage is 0.1 - 1 ml / L.

[0009] As a specific implementation method, both defoamer I and defoamer II are ALBAFLOW FFW produced by Huntsman Corporation.

[0010] As a specific implementation method, the preparation process of the fixing agent is as follows: Ⅰ) Intermediate preparation Add fatty alcohol R 1OH and a Lewis acid catalyst, heat to the reflux temperature, stir evenly, then dropwise add epichlorohydrin at the reflux temperature. After the addition is completed, continue the reaction at the reflux temperature for 5 - 6 h, add water to quench the reaction, and distill off the excess fatty alcohol R 1 OH and the unreacted epichlorohydrin, then perform vacuum distillation, collect the fractions to obtain the intermediate, (Formula I), wherein, R 1 is selected from one of C 12 H 25 , C 14 H 29 , C 16 H 33 , C 18 H 37 ; II) Quaternization reaction Dissolve the intermediate prepared in step I) in water, then slowly add dimethylamine, stir and react at 40 - 50 °C for 6 - 8 hours. After the reaction is completed, remove water by vacuum distillation to obtain the crude product, and purify the product by recrystallization with acetone to obtain the quaternary ammonium salt. The reaction formula is as follows: (Formula II).

[0011] As a specific embodiment, the Lewis acid catalyst used in the preparation process of the fixing agent is selected from one or more of AlCl 3 , SnCl 4 , ZnCl 2 , and the dosage of the Lewis acid catalyst is 1.5 - 3% of the mass of the fatty alcohol.

[0012] As a specific embodiment, in the preparation process of the intermediate, the molar ratio of epichlorohydrin to fatty alcohol added is 0.8 - 1.2:1.

[0013] Compared with the prior art, the technical solution of the present invention has the following advantages: 1) In the dyeing process of the present invention, through ultrasonic cleaning during the pretreatment process, not only can impurities on the fiber surface be efficiently removed, but also the fiber surface can be slightly etched, increasing the surface roughness, improving the binding of the fiber and the dye, and improving the dyeing efficiency; 2) During the pretreatment process, the fiber is subjected to appropriate heat and cold alternating treatment to roughen the fiber surface and enhance the abrasion fastness of the fiber; 3) A fixing agent is used in the later stage of dyeing. The epoxy group and quaternary ammonium base group in the fixing agent are combined with the fiber and the dye respectively, significantly improving the dyeing uniformity and color fastness. Description of the Drawings

[0014] Figure 1 It is an electron micrograph of undyed seaweed fiber; Figure 2 It is an electron micrograph of the seaweed fiber dyed in Example 1; Figure 3 It is an electron micrograph of the seaweed fiber dyed in Example 4. Detailed implementation manners

[0015] The technical solution of the present invention will be further described below through specific examples.

[0016] In the following examples, Defoamer I and Defoamer II both adopt ALBAFLOW FFW produced by Huntsman Corporation.

[0017] The degreasing agent adopts TISSOCYL RC9 degreasing agent produced by Chemische Fabrik Stockhausen GmbH.

[0018] The leveling agent adopts Albegal B.

[0019] The accelerating agent adopts the Fammanfeng NB series accelerating agents produced by Shanghai Yayun Textile Chemical Co., Ltd.

[0020] The soaping agent is the Evigel NW soaping agent produced by Huntsman Corporation.

[0021] The acid agent is formic acid.

[0022] The preparation process of the fixing agent is as follows: I) Intermediate preparation Add fatty alcohol R 1 OH and a Lewis acid catalyst into the reaction flask. After heating to the reflux temperature and stirring evenly, epichlorohydrin is added dropwise at the reflux temperature. After the addition is completed, the reaction is continued at the reflux temperature for 5 - 6 h, and water is added to quench the reaction. After distilling off the excess fatty alcohol R 1 OH and the unreacted epichlorohydrin, then vacuum distillation is carried out to collect the distillate to obtain the intermediate, (Formula I), wherein, R 1 is selected from one of C 12 H 25 , C 14 H 29 , C 16 H 33 , C 18 H 37 ; II) Quaternization reaction Dissolve the intermediate obtained in step (I) in water, then slowly add dimethylamine, stir and react at 40 - 50 °C for 6 - 8 hours. After the reaction is completed, remove water by vacuum distillation to obtain a crude product, and purify the product by recrystallization with acetone to obtain a quaternary ammonium salt. The reaction formula is as follows: (Formula II).

[0023] The Lewis acid catalyst used here is selected from one or more of AlCl 3 , SnCl 4 , ZnCl 2 , and the dosage of the Lewis acid catalyst is 1.5 - 3% of the mass of the fatty alcohol.

[0024] In the preparation process of the intermediate, the molar ratio of epichlorohydrin to fatty alcohol added is 0.8 - 1.2:1.

[0025] Example 1 Dyeing seaweed fiber bright red This example provides a dyeing process for improving the color fastness of seaweed fiber, which is used to dye bright red on seaweed fiber. The specific steps are as follows: 1) Pretreatment 11) Add defoamer I and degreasing agent to clear water, fully mix, adjust the pH value to 8.2 with ammonia water, put in seaweed fiber, heat up to 70 °C and cooperate with ultrasonic treatment for 20 minutes. The dosage of the defoamer is 0.5 ml / L, the dosage of the degreasing agent is 1.0 ml / L, the power intensity of the ultrasonic wave is 0.5 W / cm 2 , and the frequency of the ultrasonic wave is 30 KHz; 12) Perform heat - cold alternating treatment on the seaweed fiber treated in step 11). First, perform heat treatment in a water bath at 55 °C, and then perform cold treatment in a water bath at 10 °C. The heat - cold treatment time is 10 min each time, and the heat - cold alternating treatment ends after 5 times; 2) Dyeing 21) After injecting clear water into the dyeing equipment, add defoamer II, leveling agent and accelerating agent, fully run and mix evenly, adjust the pH value of the dye bath to 9, add the dye, heat up to 60 °C at a speed of 1.5 °C / min, and keep the temperature for 40 min. Among them, the dye is reactive yellow 1.4% (o.w.f), reactive red 3.8% (o.w.f), the dosage of the accelerating agent is 5 g / L, the dosage of defoamer II is 0.5 ml / L, and the dosage of the leveling agent is 1 ml / L; 22) Adjust the pH value of the dye bath to 10.7, add the fixing agent, heat up to 80 °C, and keep the temperature for 20 min. The structural formula of the fixing agent is: C 12 H 25 -O-CH 2 CH(OH)CH 2 -N+ (CH 3 ) 2 Cl - , the dosage of the color fixing agent is 1.5% o.w.f; 23) Cool down to room temperature and wash with clear water; 3) Soaping, add soaping agent to the dyeing equipment, heat up to 90 °C and keep warm for 20 minutes, then clean it, and the dosage of the soaping agent is 3% (o.w.f); 4) Neutralization, add acid agent to the dyeing equipment, drain the water after running for 10 minutes, and then dry it. The acid agent is formic acid and its dosage is 1 ml / L.

[0026] The electron microscope image of the seaweed fiber after dyeing in this example is as Figure 2 shown.

[0027] Example 2 Dyeing of seaweed fiber with navy blue This example provides a dyeing process for improving the color fastness of seaweed fiber, which is used for dyeing navy blue on seaweed fiber. The specific steps are as follows: 1) Pretreatment 11) Add defoamer Ⅰ and degreasing agent to clear water, fully mix and adjust the pH value to 8.5 with ammonia water, put in seaweed fiber, heat up to 50 °C and cooperate with ultrasonic treatment for 30 minutes. The dosage of the defoamer is 0.5 ml / L, the dosage of the degreasing agent is 1.0 ml / L, and the power intensity of the ultrasonic wave is 1 W / cm 2 , and the frequency of the ultrasonic wave is 25 KHz; 12) Carry out heat and cold alternating treatment on the seaweed fiber treated in step 11). First, carry out heat treatment in a water bath at 50 °C, and then carry out cold treatment in a water bath at 7 °C. The heat and cold treatment time is 10 minutes each time, and the heat and cold alternating treatment ends after 5 times; 2) Dyeing 21) After injecting clear water into the dyeing equipment, add defoamer Ⅱ, leveling agent and accelerating agent, fully run and mix evenly, adjust the pH value of the dye bath to 8.6, add dyes, heat up to 60 °C at a speed of 1.5 °C / min, and keep warm for 40 minutes. Among them, the dyes are reactive yellow 2% (o.w.f), reactive red 1.6% (o.w.f), reactive blue 3% (o.w.f), the dosage of the accelerating agent is 5 g / L, the dosage of defoamer Ⅱ is 0.5 ml / L, and the dosage of the leveling agent is 1 ml / L; 22) Adjust the pH value of the dye bath to 10.5, add the color fixing agent, heat up to 75 °C, and keep warm for 30 minutes. The structural formula of the color fixing agent is: C 14 H 29 -O-CH 2 CH(OH)CH 2 -N +(CH 3 ) 2 Cl - , the dosage of the color fixing agent is 1.5% o.w.f; 23) Cool down to room temperature and wash with clear water; 3) Soaping, add a soaping agent to the dyeing equipment, heat up to 100 °C and keep warm for 15 minutes, then clean it. The dosage of the soaping agent is 3% (o.w.f); 4) Neutralization, add an acid agent to the dyeing equipment, drain the water after running for 10 minutes, and then dry it. The acid agent is formic acid and its dosage is 1 ml / L.

[0028] Example 3 Dyeing seaweed fiber black This example provides a dyeing process for improving the color fastness of seaweed fiber, which is used to dye seaweed fiber black. The specific steps are as follows: 1) Pretreatment 11) Add defoamer Ⅰ and degreasing agent to clear water, fully mix them, adjust the pH value to 7.5 with ammonia water, put in seaweed fiber, heat up to 60 °C and cooperate with ultrasonic treatment for 20 minutes. The dosage of the defoamer is 0.1 ml / L, the dosage of the degreasing agent is 1.5 ml / L, and the power intensity of the ultrasonic wave is 0.5 W / cm 2 , the frequency of the ultrasonic wave is 40 KHz; 12) Perform heat and cold alternating treatment on the seaweed fiber treated in step 11). First, perform heat treatment in a water bath at 60 °C, and then perform cold treatment in a water bath at 10 °C. The heat and cold treatment time is 10 minutes each time, and the heat and cold alternating treatment ends after 4 times; 2) Dyeing 21) After injecting clear water into the dyeing equipment, add defoamer Ⅱ, leveling agent and accelerating agent, fully mix and run evenly, adjust the pH value of the dye bath to 9, add dyes, heat up to 55 °C at a speed of 1.5 °C / min, and keep warm for 50 minutes. Among them, the dyes are reactive yellow 2% (o.w.f), reactive red 0.7% (o.w.f), reactive blue 4% (o.w.f), the dosage of the accelerating agent is 5 g / L, the dosage of defoamer Ⅱ is 1 ml / L, and the dosage of the leveling agent is 1.5 ml / L; 22) Adjust the pH value of the dye bath to 11, add the color fixing agent, heat up to 80 °C, and keep warm for 30 minutes. The structural formula of the color fixing agent is: C 18 H 37 -O-CH 2 CH(OH)CH 2 -N + (CH 3 ) 2 Cl - , the dosage of the color fixing agent is 2% o.w.f; 23) Cool down to room temperature and wash with clear water. 3) Soaping: Add soaping agent to the dyeing equipment, heat up to 90 °C and keep warm for 30 minutes, then wash thoroughly. The dosage of the soaping agent is 3% (o.w.f). 4) Neutralization: Add acid agent to the dyeing equipment, drain the water after running for 10 minutes, and then dry. The acid agent is formic acid and its dosage is 1 ml / L.

[0029] Example 4 Dyeing seaweed fiber gray This example provides a dyeing process for improving the color fastness of seaweed fiber, which is used to dye seaweed fiber gray. The specific steps are as follows: 1) Pretreatment 11) Add antifoaming agent Ⅰ and degreasing agent to clear water, fully mix, adjust the pH value to 7.0 with ammonia water, put in seaweed fiber, heat up to 65 °C and cooperate with ultrasonic treatment for 10 minutes. The dosage of the antifoaming agent is 0.1 ml / L, the dosage of the degreasing agent is 1.5 ml / L, and the power intensity of the ultrasonic wave is 0.5 W / cm 2 , and the frequency of the ultrasonic wave is 35 KHz; 12) Conduct heat and cold alternating treatment on the seaweed fiber treated in step 11). First, conduct heat treatment in a water bath at 50 °C, and then conduct cold treatment in a water bath at 5 °C. The heat and cold treatment time is 15 minutes each time, and the heat and cold alternating treatment ends after 3 times; 2) Dyeing 21) After injecting clear water into the dyeing equipment, add antifoaming agent Ⅱ, leveling agent and accelerating agent, fully run and mix evenly, adjust the pH value of the dye bath to 8, add dyes, heat up to 50 °C at a speed of 1.5 °C / min, and keep warm and react for 30 minutes. Among them, the dyes are reactive yellow 0.08% (o.w.f), reactive red 0.13% (o.w.f), reactive blue 0.19% (o.w.f), the dosage of the accelerating agent is 5 g / L, the dosage of antifoaming agent Ⅱ is 1 ml / L, and the dosage of the leveling agent is 1.5 ml / L; 22) Adjust the pH value of the dye bath to 11, add the fixing agent, heat up to 80 °C, and keep warm and react for 30 minutes. The structural formula of the fixing agent is: C 16 H 33 -O-CH 2 CH(OH)CH 2 -N + (CH 3 ) 2 Cl - , and the dosage of the fixing agent is 1% o.w.f; 23) Cool down to room temperature and wash with clear water. 3) Soaping: Add a soaping agent to the dyeing equipment, heat up to 80 °C and keep warm for 10 minutes, then wash it clean. The dosage of the soaping agent is 2% (o.w.f); 4) Neutralization: Add an acid agent to the dyeing equipment, drain the water after running for 10 minutes, and then dry it. The acid agent is formic acid and its dosage is 0.5 ml / L.

[0030] The electron micrograph of the seaweed fiber after dyeing in this example is as Figure 3 shown.

[0031] Comparative Example 1: Dyeing the seaweed fiber with scarlet The difference between this example and Example 1 is that in the pretreatment stage, the operation of step 12) was not carried out.

[0032] Comparative Example 2: Dyeing the seaweed fiber with scarlet The difference between this example and Example 1 is that in the dyeing process, the operation of step 22) was not carried out.

[0033] Comparative Example 3: Dyeing the seaweed fiber with scarlet The difference between this example and Example 1 is that in the dyeing process, the ultrasonic cleaning operation in step 11) was not carried out.

[0034] Measure the dye uptake rate, strength performance, rubbing fastness, color fastness to washing, and color fastness to alkaline perspiration of the dyed seaweed fibers obtained in Examples 1 - 4 and Comparative Examples 1 - 3, and measure the strength performance of the undyed seaweed fiber. The strength performance after dyeing was measured with reference to GB / T 14337 - 2008; the test method standard for rubbing fastness is "TWC TM165 Test Method for Evaluating the Rubbing Color Fastness of Textiles and Wool"; the test method standard for color fastness to washing is "TWC TM193 Test Method for Determining the Color Fastness of Wool Fabrics to Machine Washing"; the test method standard for color fastness to alkaline perspiration is "TWC TM174 Test Method for Wet Alkaline Contact Color Fastness"; the dye uptake rate was measured by testing the absorbance values of the dye solution before and after dyeing with a spectrophotometer and calculated using the Lambert - Beer law. The specific measured data are shown in Table 1.

[0035] Table 1

[0036] The electron micrograph of the undyed seaweed fiber is as Figure 1 shown.

[0037] As can be seen from Table 1, during the dyeing process of seaweed fiber, ultrasonic treatment is beneficial to improving the dye uptake rate. Through the hot and cold alternating treatment, it is beneficial to increasing the roughness of the fiber surface, which not only improves the rubbing fastness of the fiber but also the dye uptake rate. In addition, the breaking strength of the fiber after the hot and cold alternation increases; while increasing the fixing agent not only improves the dye uptake rate but also the color fastness to washing and the color fastness to alkaline perspiration.

[0038] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A dyeing process for improving the color fastness of seaweed fiber, characterized in that: The dyeing process comprises the following steps: 1) Pre-treatment 11) Add defoamer I and degreasing agent to clean water, mix thoroughly and adjust pH value to 7-8.5 with ammonia water, add seaweed fiber, heat to 50-70℃ and perform ultrasonic treatment for 10-30 minutes. The dosage of defoamer I is 0.1-0.5ml / L, the dosage of degreasing agent is 0.5-1.5ml / L, and the power intensity of ultrasonic wave is 0.5-1W / cm 2 , the frequency of ultrasound is 25~40KHz; 12) The seaweed fiber treated in step 11) is subjected to alternating hot and cold treatment, firstly subjected to heat treatment in a water bath at 50-60° C., and then subjected to cold treatment in a water bath at 5-10° C., the hot and cold treatment time is 10-15 minutes each time, and the hot and cold alternating treatment is terminated after 3-5 times; 2) Dyeing 21) After injecting clean water into the dyeing equipment, add defoamer II, leveling agent and dye accelerator, fully operate evenly, adjust the pH value of the dye bath to 8-9, add dye, heat to 50-60℃ at a rate of 1.5-2℃ / min, and keep warm for 30-50min, wherein the dye is a reactive dye, and the dye accelerator is an inorganic salt containing calcium ions, and the addition amount is 1-5g / L; 22) Adjust the pH value of the dye bath to 10-11, add a fixing agent, raise the temperature to 70-80°C, and keep the temperature to react for 20-30 minutes. The structural formula of the fixing agent is: R1-O-CH2CH(OH)CH2-N + (CH3)2Cl - , wherein R1 is selected from C 12 H 25 , C 14 H 29 , C 16 H 33 , C 18 H 37 One of the above, the dosage of the fixing agent is 1-2% owf; 23) Cool down to room temperature and wash with clean water; 3) Soap washing: add soaping agent into the dyeing equipment, heat it to 80-100℃ and keep it warm for 10-30 minutes, then wash it clean; 4) Neutralization: add acid to the dyeing equipment, run it for 10 minutes, drain the water, and then dry it.

2. A dyeing process for improving the color fastness of seaweed fiber according to claim 1, characterized in that: The dyeing accelerator used in step 2) is the Farmanfeng NB series dyeing accelerator produced by Shanghai Yayun Textile Chemical Co., Ltd.

3. A dyeing process for improving the color fastness of seaweed fiber according to claim 1, characterized in that: The soaping agent used in step 3) is Ivy Clean NW soaping agent produced by Huntsman.

4. A dyeing process for improving the color fastness of seaweed fiber according to claim 1, characterized in that: The acid agent is acetic acid or formic acid, and the dosage is 0.1-1 ml / L.

5. A dyeing process for improving the color fastness of seaweed fiber according to claim 1, characterized in that: The defoamer I and the defoamer II both adopt ALBAFLOW FFW produced by Huntsman.

6. A dyeing process for improving the color fastness of seaweed fiber according to claim 1, characterized in that: The preparation process of the fixing agent is as follows: Ⅰ) Preparation of intermediates Add fatty alcohol R1OH and Lewis acid catalyst to the reaction bottle, heat to reflux temperature and stir evenly, then add epichlorohydrin dropwise at reflux temperature. After the addition is completed, keep the reflux temperature and continue the reaction for 5-6 hours, add water to quench the reaction, evaporate the excess fatty alcohol R1OH and unreacted epichlorohydrin, then perform vacuum distillation, collect the fractions, and obtain the intermediate. (Equation 1), Wherein, R1 is selected from C 12 H 25 , C 14 H 29 , C 16 H 33 , C 18 H 37 One of; Ⅱ) Quaternization reaction The intermediate prepared in step Ⅰ) is dissolved in water, and then dimethylamine is slowly added, and the reaction is stirred at 40-50° C. for 6-8 hours. After the reaction is completed, water is removed by vacuum distillation to obtain a crude product, and the product is purified by recrystallization with acetone to obtain a quaternary ammonium salt. The reaction formula is as follows: (Formula 2).

7. A dyeing process for improving the color fastness of seaweed fiber according to claim 6, characterized in that: The Lewis acid catalyst used in the preparation process of the fixing agent is selected from one or more of AlCl3, SnCl4, and ZnCl2, and the dosage of the Lewis acid catalyst is 1.5-3% of the mass of the fatty alcohol.

8. A dyeing process for improving the color fastness of seaweed fiber according to claim 6, characterized in that: During the preparation of the intermediate, the molar ratio of epichlorohydrin to fatty alcohol is 0.8-1.2:1.

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