| 초록 |
In the automotive industry, light weight materials are essentially required for fuel efficiency. Especially PP(Polypropylene) composites have the advantage of lightweight effect with low density and superior mechanical properties. Additionally, engineering plastics and metals have been replaced by PP composite in automotive parts. In this study, we optimized HIPP(High Isotacticity PP), elastomer and rigid mineral filler to satisfy high stiffness and dimensional stability. For dimensional stability of automotive parts, the CLTE(Coefficient of liner thermal expansion) of material was minimized by controlling a) rubber type & molecular weight, b) filler content & size, c) PP crystallinity. As a result, we have developed PP composites with low CLTE property, high flow ability and stiffness. |
