Abstract
The aim of this study was to develop a new BMC (Bulk Molding Compound) with low molding shrinkage and high acid resistance. The resin system used in this study was a novolac type epoxy resin with low shrink additive and the reinforcements used were glass, carbon and aramid fibers.Firstly the mold shrinkage, the heat distortion temperature and the electric resistance of BMC were measured as the functional properties. The immersion test was carried out in a bath with a mixed solution of 25wt%H2SO4 and 7.5wt% HNO3 at 65°C up to 3000hr. The weight change and the reduction of mechanical properties were measured in order to examine the degradation mechanism of BMC.It is concluded that Hybrid BMC which are reinforced by glass, carbon and aramid fibers show the excellent functional properties. The acid resistance of BMC developed in this study is much higher than that of BMC in which the matrix is the epoxy resin with high acid resistance.
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