Abstract: Epoxy-modified polysiloxane was prepared by hydrosilylation reaction of hydromethylcyclosiloxane (HMCS) and allyl glycidyl ether (AGE) using isopropanol solution of H2PtCl6 as a catalyst. The products were characterized using Fourier transform infrared spectrometer and nuclear magnetic resonance spectra. The effects of reaction temperature, reaction time, catalyst dosage, and molar ratio of HMCS/AGE on conversion ratio of reactive hydrogen were discussed. It showed that the optimal reaction conditions were reaction temperature of 85 ℃, reaction time of 6 h, catalyst dosage of 5 mg/L, and molar ratio of AGE/HMCS of 1.2/1. The conversion rate of reactive hydrogen was 87.5 %.

Key words: hydromethylcyclosiloxane, allyl glycidyl ether, hydrosilylation reaction, epoxy-modified polysiloxane