Patent ID: 8815970
Filing Date: 2014-08-26
Classification: B05D,C08G,D06M

Abstract:
1. A method of preparing polyurethane, using an epoxy resin, carbon dioxide and a polyamine compound as major raw materials, comprising the following steps: a material mixing step, wherein an epoxy resin and a catalyst are mixed uniformly until the epoxy resin is dissolved completely to form a mixed raw material; a thermal reflux step, wherein carbon dioxide gas is introduced into the mixed raw material, and then a thermal reflux is performed at a high temperature for a predetermined time to form a bis-(cyclic carbonate) containing compound (or oligomer); a microwave treatment step, wherein the bis-(cyclic carbonate) containing compound (or oligomer), a catalyst and a polyamine compound are mixed uniformly, and then a microwave reactor is used for performing a ring-opening polymerization for a predetermined time to form the PU prepolymer containing an amino group at an end; and a Michael reaction step, wherein the PU prepolymer containing an amino group at an end is mixed uniformly with a catalyst, and then the mixed solution is dropped slowing into at a compound containing diacrylate a low temperature, and the Michael reaction is performed at the low temperature to obtain an a UV cross-linking (curable) polyurethane (UV-PU).