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CN-122011287-A - Chemical crosslinking formaldehyde-free color fixing agent for leather and preparation method and application thereof

CN122011287ACN 122011287 ACN122011287 ACN 122011287ACN-122011287-A

Abstract

The invention provides a chemical crosslinking formaldehyde-free color fixing agent for leather and a preparation method and application thereof, belonging to the technical field of leather chemical industry. The chemical crosslinking formaldehyde-free color fixing agent for leather provided by the invention not only thoroughly eliminates the introduction of formaldehyde and international limited substances, meets the strict environmental protection and export requirements, but also can obviously improve the comprehensive color fastness of the dyed leather, so that the dyed leather has excellent dry-rub resistance, wet-rub resistance and perspiration resistance, and simultaneously, the yellowing resistance of the dyed leather is effectively improved, and the color is kept bright and colorless, thereby greatly improving the appearance quality, durability and market competitiveness of leather products.

Inventors

  • MAO JIAN
  • XU BINGBIN
  • YANG SISHENG
  • YAN JIANLIN

Assignees

  • 上海金狮化工有限公司

Dates

Publication Date
20260512
Application Date
20260112

Claims (10)

  1. 1. The preparation method of the chemical crosslinking formaldehyde-free color fixing agent for leather is characterized by comprising the following steps of: Preparing an amine prepolymer, mixing an organic amine compound, glycidyl ether and water, and performing a first heating reaction under the protection of inert gas to obtain the amine prepolymer; and (3) preparing a color fixing agent, mixing a cationic monomer, acrylic ester, the amine prepolymer and water, performing second heating under the protection of inert gas, and then adding an initiator to perform polymerization reaction to obtain the chemical crosslinking formaldehyde-free color fixing agent for leather.
  2. 2. The method of claim 1, wherein the first heating reaction is at a temperature of 60 ℃ to 70 ℃; The temperature of the second heating is 70-75 ℃; The polymerization reaction is carried out at 80-85 ℃.
  3. 3. The method of claim 1, wherein the initiator is added dropwise; the duration of the polymerization reaction is 1-4 hours.
  4. 4. The production method according to claim 1, wherein the organic amine compound is selected from at least one of ethylenediamine, diethylenetriamine or triethylenetetramine; the glycidyl ether is at least one selected from ethylene glycol glycidyl ether or glycerol triglycidyl ether; the cationic monomer is dimethyl diallyl ammonium chloride.
  5. 5. The preparation method according to claim 4, wherein the dimethyldiallylammonium chloride is used in the form of an aqueous solution, and the mass fraction thereof is 55% -70%.
  6. 6. The method according to claim 1, wherein the acrylic acid ester is at least one selected from ethyl acrylate, butyl acrylate, and methyl methacrylate; the initiator is at least one selected from ammonium persulfate and potassium persulfate.
  7. 7. The preparation method of the amine prepolymer according to claim 1, wherein the preparation step of the amine prepolymer comprises, by weight, 45-60 parts of an organic amine compound, 25-40 parts of glycidyl ether and 5-25 parts of water; the preparation method of the color fixing agent comprises the following raw materials, by weight, 45-65 parts of cationic monomers, 55-75 parts of acrylic esters, 5-25 parts of amine prepolymers, 35-50 parts of water and 0.3-1.0 part of initiators.
  8. 8. A chemically crosslinked formaldehyde-free fixing agent for leather prepared according to the preparation method of any one of claims 1 to 7.
  9. 9. Use of the chemically cross-linked formaldehyde-free fixing agent for leather according to claim 8 for fixing leather.
  10. 10. The use according to claim 9, characterized in that it comprises the use in a dyeing and fixing process of chrome-tanned, vegetable-tanned or synthetic-tanned leather, or in a post-treatment of a leather-dip-dyeing, spray-dyeing process, or as a primer before finishing the leather.

Description

Chemical crosslinking formaldehyde-free color fixing agent for leather and preparation method and application thereof Technical Field The invention relates to the technical field of leather chemical industry, in particular to a chemical crosslinking formaldehyde-free color fixing agent for leather and a preparation method and application thereof. Background Dyeing leather is an important process for imparting color and aesthetics to leather. The reactive dye has complete color spectrum and bright color, and has wide application in leather dyeing. However, the bonding between the reactive dye and the leather fiber is not completely firm, and under the external effects of humidity, heat, friction or perspiration, part of the dye may be desorbed, detached or migrate from the fiber, resulting in color fading, staining of other objects or color change, which is collectively called poor color fastness. In order to improve the color fastness, the color fixing treatment becomes an indispensable subsequent key step in dyeing and finishing leather. The color fixing agent is a functional leather chemical auxiliary agent, and has the core function of enhancing the binding force between the dye and the fiber through a physical or chemical mode so as to more firmly lock the dye on the fiber. The conventional fixing agent has widely used formaldehyde or its derivative as a crosslinking component, and although the fixing effect is remarkable, free formaldehyde may be released during storage or use of the product, which causes harm to human health and environment, and has been gradually limited and eliminated by the market. Later-developed formaldehyde-free fixing agents, such as polyamine-epichlorohydrin polycondensates, while avoiding formaldehyde problems, may produce by-products such as dichloropropanol during the synthesis that are severely restricted by environmental regulations, as well as facing export barriers. The current mainstream environment-friendly formaldehyde-free fixing agents are mostly polycation type, and are combined with anionic dye through cationic charge, so that the environment-friendly formaldehyde-free fixing agents are friendly to the environment, but when the environment-friendly formaldehyde-free fixing agents are applied to leather products with extremely high requirements on performances such as wet rubbing resistance and yellowing resistance, the comprehensive fixing effect is still improved. Therefore, the development of the novel formaldehyde-free color fixing agent which can meet strict environmental protection standards and comprehensively improve various fastness properties of leather dyeing has important significance for promoting green and high-quality development of leather industry. Disclosure of Invention The invention aims to provide a chemical crosslinking formaldehyde-free color fixing agent for leather, a preparation method and application thereof, and solves the technical problem that the existing color fixing agent for leather is difficult to combine in environmental protection (such as formaldehyde or limited byproducts) and color fixing performance (particularly wet rub resistance and yellowing resistance). In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a preparation method of a chemical crosslinking formaldehyde-free color fixing agent for leather, which comprises the following steps: Preparing an amine prepolymer, mixing an organic amine compound, glycidyl ether and water, and performing a first heating reaction under the protection of inert gas to obtain the amine prepolymer; and (3) preparing a color fixing agent, mixing a cationic monomer, acrylic ester, the amine prepolymer and water, performing second heating under the protection of inert gas, and then adding an initiator to perform polymerization reaction to obtain the chemical crosslinking formaldehyde-free color fixing agent for leather. Preferably, the temperature of the first heating reaction is 60-70 ℃; The temperature of the second heating is 70-75 ℃; The polymerization reaction is carried out at 80-85 ℃. Preferably, the initiator is added in a dropwise manner; the duration of the polymerization reaction is 1-4 hours. Preferably, the organic amine compound is selected from at least one of ethylenediamine, diethylenetriamine or triethylenetetramine; the glycidyl ether is at least one selected from ethylene glycol glycidyl ether or glycerol triglycidyl ether; the cationic monomer is dimethyl diallyl ammonium chloride. Preferably, the dimethyl diallyl ammonium chloride is used in the form of an aqueous solution, and the mass fraction of the dimethyl diallyl ammonium chloride is 55% -70%. Preferably, the acrylic ester is at least one selected from ethyl acrylate, butyl acrylate or methyl methacrylate; the initiator is at least one selected from ammonium persulfate and potassium persulfate. Preferably, in the step of preparing the amin