Research on the Reaction of IPDI and PPG With Organo-tin Mixed Catalyst

摘要

The kinetics of the reaction is essential for the synthesis of polyurethane.In this study,the reaction kinetics and polymerization conditions in two-step process of isophorone diisocyante (IPDI) and polypropylene glycol (PPG) with organo-tin mixed catalyst were investigated by chemical titration.The results showed that the reaction obeyed the second-order equation of step-growth polymerization,the rate constants of IPDI and PPG reaction at 50,60 and 70°C were 0.0161,0.0373 and 0.0806 kg·mol-1·min-1,respectively.The activation energy obtained from the result was 74.25 kJ·mol-1.The polyurethane with number molecular weight 38721 was synthesized and was characterized by Fourier transform infrared (FTIR).