Acidic leveling agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of textile auxiliaries, and discloses an acidic leveling agent as well as a preparation method and application thereof. The acidic leveling agent comprises tallow amine polyoxyethylene 15 ether betaine, tallow polyoxyethylene 8 ether ammonium sulfonate and an auxiliary agent, the structural formula of the tallow amine polyoxyethylene 15 ether betaine is # imgabs 0 #, and the structural formula of the tallow polyoxyethylene 8 ether ammonium sulfonate is # imgabs 1 #. The acid leveling agent has high dispersity and leveling power on acid dyes and reactive dyes, the dyed cashmere fabric is uniform in color yield and bright in color, and the dyeing fastness can be improved to a certain extent. Meanwhile, the acidic leveling agent is green and environment-friendly, does not contain alkylphenol polyoxyethylene ether and other substances, and meets REACH, RoHS and other standards.

Description

Technical Field

[0001] The invention belongs to the technical field of textile auxiliaries, and particularly relates to an acid leveling agent and a preparation method and application thereof. Background Art

[0002] During the dyeing process of cashmere fabrics, the amino and carboxyl groups in the cashmere fiber structure dissociate in the aqueous phase to form amphoteric H3N + -Cashmere-COO - (Cashmere means cashmere) ions. Under relatively acidic conditions, protonated amino groups can electrostatically adsorb anionic dyes and quickly combine to form dyeing. However, cashmere fabrics often suffer from uneven dyeing and color spots due to rapid dyeing. Therefore, an effective leveling agent must be added to improve the dyeing quality. The leveling agent can effectively slow down the binding speed of anionic dye molecules with cashmere fibers, allowing them to have sufficient time to evenly disperse and combine to the entire fabric surface, achieving uniform dyeing. Efficient leveling agents can also improve the water and light fastness of dyes, making the color of the dyed fabric more durable and brighter.

[0003] Most leveling agents are surfactants with good water solubility. With the changes of their own composition and structure, their leveling mechanism is also different. Generally, they are divided into two types: fiber-friendly and dye-friendly. Some types have affinity for both fibers and dyes. Taking acid dyes for cashmere dyeing as an example, the most widely used anionic leveling agents in the dye bath are anionic leveling agents. Their affinity for fibers is greater than the affinity of dyes for fibers. They will preferentially attach to the fiber surface to "occupy" the dye seat and delay the dyeing. The main components of this leveling agent are surfactants such as fatty alcohol sulfates or sulfonated oils. Dye-friendly leveling agents are mainly non-ionic surfactants of fatty alcohol polyoxyethylene ethers. The ether bonds of the EO (EO refers to ethylene oxide) chain segments in their structures are very easy to form hydrogen bonds with the hydroxyl or amino groups in the dye molecules to form dye affinity.

[0004] At present, the commonly used cashmere leveling agents on the market are mostly anionic, nonionic or anionic / nonionic mixed types. Although they solve most of the leveling problems, they also have their own shortcomings. Anionic leveling agents will reduce the dyeing rate during dyeing balance, making the color lighter and unable to transfer. The polymer formed by the combination of nonionic leveling agents and dyes is difficult to completely depolymerize in a short period of time, which can easily lead to excessive dye residues in the dye bath, resulting in color flowers and stains. Moreover, nonionic surfactants all have cloud point characteristics. When the temperature rises to a certain level, the water solubility will drop sharply and lose the original leveling function. Some existing leveling agents still have the problem of weak dyeing and poor environmental protection. For example, they contain substances such as alkylphenol polyoxyethylene ethers, which do not meet the standards of REACH (Chemical Regulatory System) and RoHS "Directive on Restriction of the Use of Certain Hazardous Ingredients in Electrical and Electronic Equipment".

[0005] Therefore, it is of great practical significance to develop an efficient leveling agent that can overcome the above shortcomings and can be used for cashmere dyeing. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides an acid leveling agent and a preparation method and application thereof.

[0007] The acid leveling agent of the present invention has high dispersibility and leveling power for both acid dyes and reactive dyes, and the cashmere fabric after dyeing has uniform color and bright colors, and can also improve the color fastness to a certain extent. At the same time, the acid leveling agent of the present invention is green and environmentally friendly, does not contain substances such as alkylphenol polyoxyethylene ether, and complies with REACH and RoHS standards.

[0008] A first aspect of the present invention provides an acidic leveling agent.

[0009] Specifically, an acid leveling agent includes tallow amine polyoxyethylene 15 ether betaine and tallow polyoxyethylene 8 ether ammonium sulfonate and an auxiliary agent;

[0010] The structural formula of the tallow amine polyoxyethylene 15 ether betaine is

[0011] The structural formula of the tallow polyoxyethylene 8 ether sulfonate ammonium is

[0012] wherein m+n=15, R1 is a tallow group having 12 to 18 carbon atoms;

[0013] x+y=8, R2 is a tallow group having 8-16 carbon atoms.

[0014] Preferably, the auxiliary agent includes at least one of peregal O-20, sodium diisooctyl sulfosuccinate, urea, and a pH regulator.

[0015] Preferably, the acidic leveling agent also includes water, such as deionized water.

[0016] Preferably, the acidic leveling agent, by weight, comprises 13-38 parts of tallow amine polyoxyethylene 15 ether betaine, 8-22 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, and 5-28 parts of additives. Further preferably, the acidic leveling agent, by weight, comprises 15-35 parts of tallow amine polyoxyethylene 15 ether betaine, 10-20 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, and 11-25 parts of additives.

[0017] Preferably, the acidic leveling agent comprises, by weight, 15-35 parts of tallow amine polyoxyethylene 15 ether betaine, 10-20 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, 5-15 parts of peregal O-20, 3-5 parts of sodium diisooctyl sulfosuccinate, and 3-5 parts of urea.

[0018] Preferably, the acidic leveling agent comprises, by weight, 15-35 parts of tallow amine polyoxyethylene 15 ether betaine, 10-20 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, 5-15 parts of peregal O-20, 3-5 parts of sodium dioctyl sulfosuccinate, 3-5 parts of urea, and 30-70 parts of deionized water.

[0019] Preferably, the pH of the acidic leveling agent is 5.0-6.0, more preferably 5.3-5.6.

[0020] A second aspect of the present invention provides a method for preparing an acidic leveling agent.

[0021] Specifically, a method for preparing an acid leveling agent comprises the following steps:

[0022] The components are mixed to obtain the acid leveling agent.

[0023] Preferably, the preparation method comprises the following steps:

[0024] Step (1): first add 30-70 parts of deionized water into a pre-cleaned stainless steel batching kettle, then add 3-5 parts of urea and sodium diisooctyl sulfosuccinate in sequence, set the stirring rate to 100-300 rpm, and stir at a low speed until a clear solution is obtained;

[0025] Step (2): then add 5-15 parts of Peregal O-20, 15-35 parts of tallow amine polyoxyethylene 15 ether betaine and 10-20 parts of tallow polyoxyethylene 8 ether ammonium sulfonate in sequence, stir for 20-30 minutes each time adding one component, set the stirring speed to 500-800 rpm, and stir at high speed until completely dissolved to obtain a mixture;

[0026] Step (3): adjusting the pH of the mixture obtained in step (2) to 5.0-6.0 with glacial acetic acid, continuing high-speed stirring for 10-30 minutes, then standing for 0.5-1 hour, and finally filtering the material to obtain the acid leveling agent.

[0027] Preferably, the preparation method of the tallow amine polyoxyethylene 15 ether betaine comprises the following steps:

[0028] The tallow amine polyoxyethylene 15 ether is mixed with a solvent, an alkaline catalyst is added, and then chloroacetic acid or chloroacetate is added to carry out a reflux reaction to obtain the tallow amine polyoxyethylene 15 ether betaine.

[0029] Preferably, the solvent is at least one of water and ethanol. For example, the solvent is composed of ethanol and water in a volume ratio of 70:30.

[0030] Preferably, the alkaline catalyst includes at least one of sodium bicarbonate and sodium carbonate.

[0031] Preferably, the chloroacetate comprises sodium chloroacetate or potassium chloroacetate.

[0032] Preferably, the temperature of the reflux reaction is 60-80°C, more preferably 70-80°C.

[0033] Preferably, the reflux reaction time is 4-8 hours, more preferably 6-8 hours.

[0034] Preferably, after the reflux reaction is completed, the reaction is monitored by thin layer chromatography (TLC), and then dilute hydrochloric acid is added to adjust the pH of the system to 3-4, and the mixture is concentrated by rotary evaporation. Finally, the mixture is recrystallized using a small molecule alcohol to obtain a light yellow waxy solid, which is tallow amine polyoxyethylene 15 ether betaine.

[0035] The tallow amine polyoxyethylene 15 ether betaine is prepared by using alkyl ethoxylated tallow tertiary amine and chloroacetic acid or sodium chloroacetate as raw materials and carrying out a quaternization reaction of the tallow amine.

[0036] Tallow amine polyoxyethylene 15 ether betaine is a zwitterionic surfactant.

[0037] Preferably, the preparation method of the tallow polyoxyethylene 8 ether sulfonate ammonium comprises the following steps:

[0038] The tallow amine polyoxyethylene 8 ether is mixed with a solvent, an alkaline catalyst is added, and then 2-chloroethanesulfonic acid or 2-chloroethanesulfonic acid salt is added to carry out a reflux reaction to obtain the tallow polyoxyethylene 8 ether ammonium sulfonate.

[0039] Preferably, the solvent is at least one of water and ethanol. For example, the solvent is composed of ethanol and water in a volume ratio of 70:30.

[0040] Preferably, the alkaline catalyst includes at least one of sodium bicarbonate and sodium carbonate.

[0041] Preferably, the 2-chloroethanesulfonate salt includes sodium 2-chloroethanesulfonate or potassium 2-chloroethanesulfonate.

[0042] Preferably, the temperature of the reflux reaction is 60-80°C, more preferably 70-80°C.

[0043] Preferably, the reflux reaction time is 4-8 hours, more preferably 6-8 hours.

[0044] Preferably, after the reflux reaction is completed, the reaction is monitored by thin layer chromatography (TLC), and then dilute hydrochloric acid is added to adjust the pH of the system to 3-4, and the mixture is concentrated by rotary evaporation. Finally, the mixture is recrystallized using a small molecule alcohol to obtain tallow polyoxyethylene 8 ether sulfonate ammonium.

[0045] Tallow polyoxyethylene 8 ether sulfonate ammonium is a zwitterionic surfactant, which is prepared from alkyl ethoxylated tallow tertiary amine and 2-chloroethanesulfonic acid or sodium 2-chloroethanesulfonate, and is also prepared by the quaternization reaction of tallow amine.

[0046] The third aspect of the present invention provides a use of an acidic leveling agent.

[0047] The application of the above acid leveling agent in the process of fabric dyeing.

[0048] Preferably, the fabric comprises cashmere fabric.

[0049] The above-mentioned acid leveling agents are applicable to fabrics dyed with acid dyes.

[0050] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0051] (1) The acidic leveling agent of the present invention comprises tallow amine polyoxyethylene 15 ether betaine and tallow polyoxyethylene 8 ether ammonium sulfonate and an auxiliary agent; it has high dispersibility and leveling power for both acidic dyes and reactive dyes, and the cashmere fabric after dyeing has uniform color and bright colors, and can also improve the color fastness to a certain extent. At the same time, the acidic leveling agent of the present invention is green and environmentally friendly, does not contain substances such as alkylphenol polyoxyethylene ether, and complies with REACH and RoHS standards.

[0052] (2) The acidic leveling agent of the present invention is an amphiphilic leveling agent, and the two main components of the leveling agent are tallow amine polyoxyethylene 15 ether betaine and tallow polyoxyethylene 8 ether ammonium sulfonate, and both components are prepared by a specific method.

[0053] (3) The first main component of the acid leveling agent of the present invention is tallow amine polyoxyethylene ether betaine containing 15 EO numbers, which is prepared by quaternization reaction of tallow amine using alkyl ethoxylated tallow tertiary amine and chloroacetic acid or sodium chloroacetate as raw materials. This amphoteric surfactant has both dye affinity and fiber affinity, so its migration and slow dyeing effects are more prominent than those of conventional single ionic components, and it has excellent dispersibility while ensuring dye uptake, making dyeing stability higher.

[0054] (4) The second main component of the acidic leveling agent of the present invention is tallow polyoxyethylene ether sulfonate ammonium containing 8 EO numbers, which is prepared by alkyl ethoxylated tallow tertiary amine and 2-chloroethanesulfonic acid or sodium 2-chloroethanesulfonate as raw materials, and is also prepared by quaternization reaction of tallow amine. The negative ions in the sulfonate molecule have a strong electrostatic effect with the cashmere fiber, which can improve the saturated adsorption of the dye. It is used to assist the betaine type active ingredient to achieve better color quantity and color fastness while achieving level dyeing.

[0055] (5) The acid leveling agent of the present invention has excellent leveling effect on cashmere and wool fabrics. After dyeing, the surface color of the fabric is deep and bright, and the color is uniform and bright. It can be used under low temperature conditions, saving energy consumption. DETAILED DESCRIPTION

[0056] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0057] Unless otherwise specified, the raw materials, reagents or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0058] In the dyeing process of cashmere fabric, the adsorption curve of dye on fiber conforms to the Langmuir-Nernst empirical equation:

[0059]

[0060] Where [D] f is the concentration of dye adsorbed on the fiber, [D] i is the dye concentration in the initial dye bath, [D] s is the dye concentration during the dyeing process, [A s ] is the Langmuir saturation adsorption value, K n , K l are the Nernst and Langmuir partition coefficients, respectively.

[0061] From the adsorption equation, we can see that [D] f and [D] s When [D]s is small, [D] f Follow [D] s The positive increasing trend is obvious, and rapid adsorption occurs between the dye molecules and the fibers. s After increasing to a certain extent, [D] fThe change range is not large, and the dyeing rate slows down significantly at this time, reaching adsorption equilibrium. Due to the localized adsorption between acid dyes and cashmere fibers, in the early stage of dyeing, not only the dye anions and the amino cations in the cashmere fibers are quickly combined with Coulomb force, but also there are strong intermolecular forces and hydrogen bonds between the dye and the cashmere macromolecules. At this time [D] f The increase is fast, which is manifested as fast dyeing. After adding the amphiphilic leveling agent, it can have both fiber-affinity and dye-affinity effects. It can not only occupy the dyeing seat on the fiber, hinder the combination of dye and fiber and delay dyeing, but also use the interaction between non-ionic surfactant components and dye molecules to pull the dark part of the dye back to the dye bath, and then transfer it to the light area to achieve level dyeing. After adding the proportion of sulfonate with stronger electronegativity to the component, the strong electrostatic interaction between it and cashmere fiber can significantly increase the saturation adsorption value [A s ], so [D] f It becomes bigger, which means that the color yield and color fastness are further improved.

[0062] Example 1

[0063] An acidic leveling agent comprises the following components in parts by weight: 20 parts of tallow amine polyoxyethylene 15 ether betaine, 10 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, 10 parts of peregal O-20, 3 parts of sodium diisooctyl sulfosuccinate, 3 parts of urea and 54 parts of deionized water.

[0064] The structural formula of tallow amine polyoxyethylene 15 ether betaine is m+n=15. The preparation method is as follows: stearylamine polyoxyethylene 15 ether (AC-1815) is dissolved in 400mL of ethanol, and 12mL of saturated NaHCO3 solution is added as a catalyst. 120g of 98% sodium chloroacetate aqueous solution is added dropwise at a stirring rate of 100rpm. After the addition is completed, the temperature is raised to 80°C, the stirring rate is maintained at 450rpm, and the reflux reaction is continued for 8h. After the complete conversion of stearylamine polyoxyethylene 15 ether is monitored by thin layer chromatography (TLC), dilute HCl is added to adjust the pH of the reaction system to 4.0, the solvent is removed by rotary evaporation, and finally recrystallized twice by isopropanol. After drying, a light yellow waxy solid is obtained, which is tallow amine polyoxyethylene 15 ether betaine.

[0065] The structural formula of tallow polyoxyethylene 8 ether sulfonate ammonium is x+y=8. The preparation method is as follows: laurylamine polyoxyethylene 8 ether (LAE-8) is dissolved in 400 mL of deionized water and heated to 60° C. 167 g of sodium 2-chloroethylsulfonate powder is slowly added under low-speed stirring, and then the stirring is maintained for 3 hours and then the temperature is raised to 80° C. and the reflux reaction is continued for 3 hours. After the reaction is completed by monitoring with thin layer chromatography, dilute HCl is added to adjust the pH to 4.0, the water is removed by rotary evaporation and concentrated, and a white waxy solid is obtained by recrystallization with ethanol twice, which is tallow polyoxyethylene 8 ether sulfonate ammonium.

[0066] A method for preparing an acid leveling agent comprises the following steps:

[0067] Step (1): In a clean 10L batching kettle, first add 40 parts of deionized water, then add 3 parts of urea and 3 parts of sodium diisooctyl sulfosuccinate in sequence, set the stirring rate to 150 rpm, and stir until completely dissolved to obtain a mixture A;

[0068] Step (2): adding 10 parts of Peregal O-20, 20 parts of tallow amine polyoxyethylene 15 ether betaine and 10 parts of tallow polyoxyethylene 8 ether ammonium sulfonate to mixture A in sequence, stirring for 20 minutes after each addition of a component, and finally adding 14 parts of deionized water and setting the stirring rate to 600 rpm, stirring until the solution is clear and transparent, to obtain mixture B;

[0069] Step (3): adjusting the pH of the mixture B to 5.6 with glacial acetic acid, stirring at a stirring speed of 600 rpm for 30 min, and then standing for 1 h, and finally filtering the material to obtain an acidic leveling agent.

[0070] Example 2

[0071] An acidic leveling agent comprises the following components in parts by weight: 25 parts of tallow amine polyoxyethylene 15 ether betaine, 8 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, 7 parts of peregal O-20, 5 parts of sodium dioctyl sulfosuccinate, 3 parts of urea, and 52 parts of deionized water.

[0072] The structures and preparation methods of tallow amine polyoxyethylene 15 ether betaine and tallow polyoxyethylene 8 ether ammonium sulfonate are the same as those in Example 1. The preparation steps of the acid leveling agent are basically the same as those in Example 1, except that the dosage of the components is different. The pH of the acid leveling agent obtained in Example 2 is 5.3.

[0073] Example 3

[0074] An acidic leveling agent comprises the following components in parts by weight: 27 parts of tallow amine polyoxyethylene 15 ether betaine, 8 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, 7 parts of peregal O-20, 3 parts of sodium diisooctyl sulfosuccinate, 3 parts of urea and 52 parts of deionized water.

[0075] The structural formula of tallow amine polyoxyethylene 15 ether betaine is m+n=15. The preparation method is as follows: laurylamine polyoxyethylene 15 ether (Solvay F-1215) is dissolved in 400mL of ethanol aqueous solution (volume ratio: ethanol / water=70 / 30), and 12mL of saturated NaHCO3 solution is added as a catalyst. 120g of 98% sodium chloroacetate aqueous solution is added dropwise at a stirring rate of 100rpm. After the addition is completed, the temperature is raised to 80°C, the stirring rate is maintained at 450rpm, and the reflux reaction is continued for 8h. After the complete conversion of stearylamine polyoxyethylene 15 ether is monitored by thin layer chromatography (TLC), dilute HCl is added to adjust the pH of the reaction system to 4.0, the solvent is removed by rotary evaporation, and finally recrystallization is performed twice by isopropanol. After drying, a light yellow flaky solid is obtained, which is tallow amine polyoxyethylene 15 ether betaine.

[0076] The structural formula of tallow polyoxyethylene 8 ether sulfonate ammonium is x+y=8, the preparation method is:

[0077] Take palmitamine polyoxyethylene 8 ether (Solvay F-1215) and dissolve it in 400 mL of deionized water, and heat it to 60 ° C. Slowly add 167 g of 2-chloroethyl sulfonate sodium powder under low-speed stirring. After the addition is completed, keep stirring for 3 hours, then heat it to 80 ° C and continue to reflux for 3 hours. After the reaction is completed by monitoring with thin layer chromatography, add dilute HCl to adjust the pH to 4.0, evaporate to remove water and concentrate, and recrystallize it twice with ethanol to obtain a white waxy solid, which is tallow polyoxyethylene 8 ether sulfonate ammonium.

[0078] The preparation steps of the acidic leveling agent are basically the same as those in Example 1, and the pH of the acidic leveling agent is 5.5.

[0079] Example 4

[0080] An acidic leveling agent comprises the following components in parts by weight: 18 parts of tallow amine polyoxyethylene 15 ether betaine, 8 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, 12 parts of peregal O-20, 5 parts of sodium diisooctyl sulfosuccinate, 3 parts of urea and 54 parts of deionized water.

[0081] The structures and preparation methods of tallow amine polyoxyethylene 15 ether betaine and tallow polyoxyethylene 8 ether ammonium sulfonate are the same as those in Example 3. The preparation steps of the acidic leveling agent are basically the same as those in Example 1, and the pH of the acidic leveling agent is 5.6.

[0082] Comparative Example 1

[0083] Comparative Example 1: An equal amount of coconut amine polyoxyethylene 8 ether (AC-2408) was used to replace the lauryl amine polyoxyethylene 8 ether (LAE-8) in Example 1, and the remaining components and process were the same as those in Example 1. The structural formula of tallow polyoxyethylene 8 ether sulfonate ammonium is

[0084]

[0085] Comparative Example 2

[0086] Comparative Example 2: An equal amount of laurylamine polyoxyethylene 20 ether (PN-1220) was used to replace the laurylamine polyoxyethylene 8 ether (LAE-8) in Example 1, and the remaining components and process were the same as those in Example 1. The structural formula of tallow polyoxyethylene 8 ether sulfonate ammonium is

[0087]

[0088] Product effect testing

[0089] Cashmere fabric dyeing process: weigh 5.00g of 16-count pure cashmere fabric, x% (owf, x=0.4 or 2.45) of acid dye, 0.5% (0.5% of owf) of the acid leveling agent prepared in the above embodiment or comparative example, 4% of sodium sulfate, bath ratio 1:20. Adjust the pH of the dye bath to 5.2. Set the starting temperature to 40°C, maintain a heating rate of 1°C / min after dyeing, heat to 60°C and keep warm for 30min, then heat to 95°C at a heating rate of 1°C / min and keep warm for 60min, cool down and exit the bath.

[0090] Among them, the dye ratio for dyeing light colors is: acid yellow 0.30%, acid green B-BG 0.10%; the dye ratio for dyeing dark colors is: acid navy blue B 2.10%, acid red BG 0.35%.

[0091] After the cashmere fabric is dyed, 20 mL of the residual solution is taken and diluted to 500 mL, and then the maximum absorption wavelength (λ max) The absorbances A1 and A0 of the residual dye solution and the blank dye solution were measured respectively, and the dyeing percentage E D Calculate according to the following formula: ED (%) = (1-A1 / A0)*100%.

[0092] K / S value is an important indicator of the color depth of fabrics. The larger the K / S value, the darker the color. The K / S value of cashmere fabric after dyeing was measured by reflection spectrophotometer. The instrument parameters were set to micro aperture, specular reflection, D 65 Light source, CIE 10° standard observer. Dyeing uniformity is also tested using a reflectance spectrophotometer. Eight points are evenly measured on the dyed cashmere fabric to measure the K / S value, and the standard deviation δ is calculated according to the following formula:

[0093]

[0094] Where X is the K / S value, i is any test point, and n is the number of K / S test points on the same piece of fabric. The smaller δ is, the smaller the average value of the data deviation is, and the better the dyeing uniformity of the fabric is.

[0095] In addition, the dyed cashmere fabrics were tested according to GB / T 3921-2008 Textiles - Color Fastness - Color Fastness to Soaping, and then the gray scale for color change assessment in GB / T 250-2008 Textiles - Color Fastness - Gray Scale for Staining Assessment in GB / T 251-2008 Textiles - Color Fastness - Gray Scale for Staining Assessment in GB / T 252-2008 Textiles - Color Fastness - Color Fastness to Rubbing, and the dry and wet rubbing fastness grades of the dyed cashmere fabrics were assessed using the gray scale for staining assessment in GB / T 251-2008 Textiles - Color Fastness - Gray Scale for Staining Assessment in GB / T 3920-2008 Textiles - Color Fastness - Color Fastness to Rubbing. The test results are shown in Tables 1 and 2.

[0096] The blank sample in the table refers to the dyed sample without adding leveling agent.

[0097] Table 1: Comparison of various performance indicators of the acid leveling agent in the embodiment and the comparative example after cashmere fabric is dyed light color

[0098]

[0099]

[0100] Table 2: Comparison of various performance indicators of cashmere fabrics dyed dark by acid leveling agents in Examples and Comparative Examples

[0101]

[0102] From the results of Table 1 and Table 2 above, it can be seen that the acid leveling agent in each embodiment of the present invention shows good dye uptake and excellent leveling effect when cashmere fabric is dyed light and dark colors, and while achieving leveling, multiple color fastnesses are also improved by 0.5 level, which is an efficient leveling agent. The excellent performance of the acid leveling agent of the present invention depends on the mutual synergistic effect and synergistic effect between the components. When the main component of the acid leveling agent in the comparative example changes, the synergistic effect is unbalanced, and the affinity between the dye and the fiber and the dye adsorption rate are greatly changed, resulting in color flower and uneven color after dyeing, which seriously affects the leveling effect.

Claims

1. An acid leveling agent, characterized in that: Including tallow amine polyoxyethylene 15 ether betaine and tallow polyoxyethylene 8 ether ammonium sulfonate and auxiliary agents; The structural formula of the tallow amine polyoxyethylene 15 ether betaine is The structural formula of the tallow polyoxyethylene 8 ether sulfonate ammonium is wherein m+n=15, R1 is a tallow group having 12 to 18 carbon atoms; x+y=8, R2 is a tallow group having 8-16 carbon atoms.

2. The acid leveling agent according to claim 1, characterized in that The auxiliary agent includes at least one of peregal O-20, sodium diisooctyl sulfosuccinate, urea, and a pH regulator.

3. The acid leveling agent according to claim 1, characterized in that The acidic leveling agent also includes water.

4. The acid leveling agent according to claim 1, characterized in that The acid leveling agent comprises, by weight, 13-38 parts of tallow amine polyoxyethylene 15 ether betaine, 8-22 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, and 5-28 parts of auxiliary agent.

5. The acidic leveling agent according to claim 3, characterized in that The auxiliary agent comprises Peregal O-20, sodium dioctyl sulfosuccinate and urea, and the acid leveling agent comprises, by weight, 15-35 parts of tallow amine polyoxyethylene 15 ether betaine, 10-20 parts of tallow polyoxyethylene 8 ether ammonium sulfonate, 5-15 parts of Peregal O-20, 3-5 parts of sodium dioctyl sulfosuccinate and 3-5 parts of urea.

6. The method for preparing the acid leveling agent according to any one of claims 1 to 5, characterized in that: The following steps are involved: The components are mixed to obtain the acid leveling agent.

7. The preparation method according to claim 6, characterized in that: The preparation method of the tallow amine polyoxyethylene 15 ether betaine comprises the following steps: The tallow amine polyoxyethylene 15 ether is mixed with a solvent, an alkaline catalyst is added, and then chloroacetic acid or chloroacetate is added to carry out a reflux reaction to obtain the tallow amine polyoxyethylene 15 ether betaine.

8. The preparation method according to claim 7, characterized in that: The alkaline catalyst includes at least one of sodium bicarbonate and sodium carbonate; and / or the chloroacetate includes sodium chloroacetate or potassium chloroacetate; and / or the temperature of the reflux reaction is 60-80° C.; and / or the time of the reflux reaction is 4-8 hours.

9. The preparation method according to claim 6, characterized in that: The preparation method of the tallow polyoxyethylene 8 ether sulfonate ammonium comprises the following steps: The tallow amine polyoxyethylene 8 ether is mixed with a solvent, an alkaline catalyst is added, and then 2-chloroethanesulfonic acid or 2-chloroethanesulfonic acid salt is added to carry out a reflux reaction to obtain the tallow polyoxyethylene 8 ether ammonium sulfonate.

10. Use of the acid leveling agent according to any one of claims 1 to 5 in a fabric dyeing process.

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