Leather retanning fat-liquoring agent and preparation method thereof
A technology for retanning and fatliquoring and leather, which is applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, tanning treatment, etc. Problems such as late start, high storage stability, pleasant smell, and improved elasticity
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Embodiment 1
[0016] At 60 °C, 25 g of polymaleic anhydride was completely dissolved with 50 g of N,N-dimethylformamide, 46 g of dodecylamine and 0.6 g of p-toluenesulfonic acid were added, and the reaction was continued at 90 °C for 3.5 hours after mixing evenly. ; Remove 55% of N, N-dimethylformamide by distillation under reduced pressure, be cooled to 55 ℃, use the sodium hydroxide that mass concentration is 30% to adjust the pH value of the solution to be about 6.5, and finally add water to adjust the solid content of the product as 20%.
Embodiment 2
[0018] At 65 °C, 25 g of polymaleic anhydride was completely dissolved with 60 g of diethylene glycol dimethyl ether, 50 g of tetradecylamine and 0.8 g of p-toluenesulfonic acid were added, and the reaction was continued at 95 ° C for 4 hours after mixing uniformly; Press distillation to remove 65% of diethylene glycol dimethyl ether, cool down to 60°C, adjust the pH value of the solution to about 6.5 with 30% sodium hydroxide, and finally add water to adjust the solid content of the product to 20%.
Embodiment 3
[0020] At 55°C, 25g of polymaleic anhydride was completely dissolved with 47g of N,N-dimethylformamide, 62g of hexadecylamine and 0.8g of sulfuric acid were added, and the reaction was continued at 90°C for 3.5 hours under reduced pressure. 60% of N,N-dimethylformamide was distilled off, cooled to 50°C, the pH of the solution was adjusted to about 7.0 with 30% sodium hydroxide, and finally water was added to adjust the solid content of the product to 20%.
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