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以丙二酸二乙酯、丙烯酸乙酯和二乙烯三胺为主要原料,利用活泼亚甲基化合物的迈克尔反应及酰胺化缩合制备得超支化聚合物HPC-NH2。采用正交试验研究了四元羧酸酯与二乙烯三胺超支化聚合HPC-NH2的最佳合成条件。试验结果表明超支化聚合的最佳合成条件为:n(四元羧酸酯)∶n(二乙烯三胺)为1∶3.5;反应温度25℃;反应时间16h。运用傅里叶红外光谱、胺值及凝胶渗透色谱,对超支化聚合物HPC-NH2进行了测试。应用试验表明:该超支化聚合物HPC-NH2用于黄牛革复鞣时,其复鞣后的成革抗张强度与Relugan R7复鞣剂复鞣后的基本相当,成革的撕裂强度为49.67N/mm,比Relugan R7复鞣后的成革增加了39.0%。
Hyperbranched polymer HPC-NH2 was prepared by Michael reaction of amylose and amidation condensation with diethyl malonate, ethyl acrylate and diethylenetriamine as main raw materials. The optimum conditions for the synthesis of hyperbranched poly (ethylene glycol) (HPC-NH2) tetracarboxylate and diethylenetriamine were studied by orthogonal test. The experimental results show that the optimum conditions for the hyperbranched polymerization are as follows: n (tetracarboxylic acid ester): n (diethylenetriamine) is 1: 3.5; reaction temperature is 25 ℃; reaction time is 16h. The hyperbranched polymer HPC-NH2 was tested by Fourier transform infrared spectroscopy, amine number and gel permeation chromatography. The application tests show that when the hyperbranched polymer HPC-NH2 is used for the retanning of yellow cattle, the tensile strength of the tanned leather after retanning is basically the same as that of Relugan R7 retanning agent, the tear strength of the leather is 49.67N / mm, 39.0% more than that of Relugan R7 retanned leather.