To decrease the curing temperature of epoxy resin with dicyandiamide,a new kind of modified dicyandiamide curing agent was prepared with diaminodiphenylmethane and dicyandiamide as raw materials, distilled water as solvent and hydrochloricacid as a catalyst. The optimum preparation technology of bis-(biguanide-p-phenyl) methane was studied by orthogonal experiments of three factors and three levels. The results show that the yield of bis-(biguanide-p-phenyl) methane is 85.12%at reaction time of 4 h,reaction temperature of 120℃,and feed ratio of 1:2.15. The structures of the compounds were analyzed and confirmed by infrared spectroscopy and hydrogen nuclear magnetic spectroscopy. The modified dicyanodiamide is pure without by-products.%为了降低双氰胺固化环氧树脂时的固化温度,以二氨基二苯甲烷、双氰胺为原料,蒸馏水作溶剂,盐酸作催化剂制备了一种新型改性双氰胺固化剂.采用三因素三水平正交实验研究反应时间、反应温度、反应物投料比例对二-(双胍基对苯基)甲烷产率的影响.结果表明:当反应时间4 h,反应温度120℃,二氨基二苯甲烷和双氰胺物质的量比1:2.15时,二-(双胍基对苯基)甲烷的产率可达85.12%.用红外光谱、核磁氢谱对化合物化合物结构进行分析并确认.该法合成的二-(双胍基对苯基)甲烷产物纯净,无副产物产生.
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