The influences of proportion of flexible epoxy resin on dielectric properties

Epoxy resin has been widely used in dry-type insulation application, such as dry-type bushings. This study focuwes on the epoxy formulation system effect on the dielectric properties of epoxy resin. With methyl hexahydrophthalic anhydride as curing agent, we made the specimens which were mixed epoxy resin and flexible epoxy resin in different weight. Because of the proportion of flexible epoxy resin, the composite epoxy resin specimens have different glass transition temperature. Experimental results demonstrate that the glass transition temperature decreases linearly as proportion of flexible epoxy resin rises. Glass transition temperature has a considerable effect on dielectric properties of epoxy resin.