The synthesis and characterization of Bis- (biguanide-p-phenyl) methane

To decrease the curing temperature of epoxy resin with dicyandiamide, a new kind of modified dicyandiamide curing agent was prepared with daimio diphenyl methane and dicyandiamide as raw materials, distilled water as solvent and hydrochloric acid 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 reaches to 85.12% at reaction time of 4h, reaction temperature of 120 °C, mole ratio of 1:2.15. The structures of the compounds were analysed and confirmed by the Infrared spectroscopy and Hydrogen nuclear magnetic spectroscopy. The product is pure without by-products by this way and the modified dicyandiamide had higher reactivity than unmodified dicyandiamide.