Leather retanning fat-liquoring agent and preparation method thereof

Abstract

The invention discloses a leather retanning fat-liquoring agent and a preparation method thereof. The component of the leather retanning fat-liquoring agent is poly(maleic acid) fat monoamide which is a homopolymer with the molecular weight between 300 and 800; the preparation method comprises the following steps: dissolving maleic anhydride by using an organic solvent of which the mass is 1 to 3 times of that of poly-maleic anhydride, then adding fatty amine to the mixture, and adding an acid catalyst to the mixture to perform reaction at a temperature of between 80 and 130 DEG C for 2 to 6 hours; and performing reduced pressure distillation to remove most of the solvent, cooling the mixture until the temperature is between 50 and 65 DEG C, adjusting the pH of the solution to between 6 and 8 by using sodium hydroxide and adjusting the solid content to between 15 and 25 percent to obtain the leather retanning fat-liquoring agent. The poly(maleic acid) fat monoamide is a multifunctional leather chemical material integrating retanning and fat-liquoring. The leather retanning fat-liquoring agent which contains the poly(maleic acid) fat monoamide and is prepared by the method not only has pleasant smell but also has high storage stability, the leather processed by the leather retanning fat-liquoring agent has improvements in tensile strength, oil lubrication sense, fullness, softness and elasticity, and the leather has obviously-improved waterproofness after being fixed by a chrome tanning agent.

Description

Technical field: [0001] The invention relates to a leather retanning fatliquor, and the invention also relates to a preparation method of the leather retanning fatliquor. Background technique [0002] Oligomeric surfactants are a new type of surfactants that have emerged in recent years. They are composed of two or more identical or almost identical structural units. This special composition structure brings many excellent properties and Broad application prospects. Although there are many researches and reports on oligomeric surfactants abroad in recent years, the research in this field in my country started relatively late, and the research in this field in recent years has mainly focused on the biquaternary ammonium salt dimerized surfactants. In terms of oligomeric surfactants (ie Gemini surfactants), other related research reports are relatively few, and the reports on the application of oligomeric surfactants in the leather industry are even less. SUMMARY OF THE INVE...

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Problems solved by technology

Although there have been many studies and reports on oligomeric surfactants abroad in recent years, the research in this area in my country started relatively late. In recent years, research in this field has mainly focused on diquaternary ammonium salt type dimeric surfactants. In terms of surfactants (i.e. Gemini surfactants), there are relatively few other relevant research reports, and there are even fewer reports on the application of oligomeric surfactants in the leather industry.

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