Preparation Of A Polypropylene Automotive Bumper

Polypropylene (PP) is widely used for abundant material, good mechanical performance, chemistry-resisting, and low price. Polypropylene have been widely applied in fields of Packing, agriculture, building, automobile, electrical equipment, et al. But the disadvantages of low rigidity, low strength and low toughness seriously limit their further applications in fields of high-performance structural materials. So Polypropylene should be strengthened and toughness. At Present, chemical modification techniques of copolymerizing, grafting, and physical modification including elastomer blending, rigid organize filler filling.In this paper, PP as fundamental resin was toughed by elastomer of ethylene-propylene-diene(EPDM) as primary toughness agent, With maleic anhydride grafted polypropylene(PP-g-MAH) to improve polarity of the compound, and talcum(talc) as filler for the Special Compound of Car bumper by extrusion technology on twin-screw extruder. And the content of the EPDM,Dicumyl peroxide (DCP),talc influence the mechanical performance of the Special Compound of Car bumper. The results of the test of impact strength, tensile strength, melt flow rate (MFR) and the analysis of SEM to describe microcosmic structure.The mechanical properties, flow ability and morphological structure of blends based on the content of DCP was studied, the results showed that the MFR of the blends was increased with the increment of DCP. The Impact strength of the blends was decreased with the increment of DCP and the yield stress of the blends was decreased. The SEM showed that the EPDM particle was smaller particle size and a more homogeneous distribution in the matrix.The mechanical properties, flow ability and morphological structure of blends based on the content of talcum was studied, the results showed that the MFR of the blends was decreased with the increment of talcum. The Impact strength of the blends was decreased with the increment of talcum and the yield stress of the blends was first increased and then decreased. The SEM showed that talcum and the EPDM particle was smaller particle size and a more homogeneous distribution in the matrix.The optimum processing parameter and formulation for the Special Compound of Car bumper were determined. Blends could be improved by using simple composite crafts and cheap reinforcements. The compound had a good process ability, higher impact resistance and spray-paint easily, being a new impact resistant PP with excellent overall property. It could substitute similar imported product.