Acrylic resin retanning agent and preparation method thereof

Abstract

The invention provides an acrylic resin retanning agent, which is obtained by polymerization of the following raw materials in water: crylic acid or methacrylic acid; methacryloyloxyethyl trimethyl ammonium chloride; acetoacetate ethyl methacrylate; chain regulator; catalytic agent and initiator. The invention also provides a preparation method of the acrylic resin retanning agent. According to the method, polymerization of acrylic monomers can be initiated at low temperature, so that the stability of a reaction system in a feeding period is easy to control, the reaction is stable, the energy consumption can be saved, and the green production is favored. The acrylic resin retanning agent provided by the invention has favorable filling performance and convergence performance, the compactibility of hide fiber can be improved, the color loss can be avoided, the absorption of dye and fatliquor is favored, the absorption rate is improved, the waste water emission is reduced, and the effects of dyeing and fatliquoring are improved.

Description

technical field [0001] The invention belongs to the technical field of retanning agents for tanning, and in particular relates to an acrylic resin retanning agent and a preparation method thereof. Background technique [0002] Retanning is an indispensable process in the process of leather making. It is known as the "golden touch" of leather making. Retanning can improve the fullness, firmness, and reduce the difference in parts of the leather, and it is also beneficial to subsequent processes. carried out. [0003] Retanning agents are tanning materials added during the retanning process, mainly including acrylic resin retanning agents, amino resin retanning agents, oxazolidine retanning agents, etc. Among them, acrylic resin has good water dispersibility, good binding ability with leather, strong filling ability, obvious thickening effect on leather, and can also endow leather with good softness, fullness and elasticity. At the same time, the carboxyl group in the acryli...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent literature with the publication number CN101851310A discloses a preparation method of an acrylic acid retanning agent. First, acrylic acid, a chain transfer agent, an initiator, an oxidizing agent and a regulator are mixed in an aqueous solution containing a pH buffer solution at a temperature of 98°C to 102°C. After the polymerization reaction is completed, add a regulator solution to continue the reaction at 80 ° C ~ 85 ° C, then add sodium hydroxide solution to continue the reaction, continue to heat up to 100 ° C, add an oxidant solution to keep the temperature and react to obtain an acrylic retanning agent. The acrylic retanning agent obtained by the method has narrow molecular weight distribution, moderate molecular weight, good permeability and filling property, good absorption, and can effectively reduce the poor position of leather and the content of chromium in wastewater. After retanning, the leather is soft and plump, grainy However, the synthesis temperature of this method is high, and the heat release of the acrylic monomer is serious during the synthesis process, and the temperature in the reaction process is not suitable for control, and the obtained acrylic retanning agent has discoloration, which will cause Affect the absorption of dyes and lipids

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