The Influence of Modified Polypropylene on Injection Molding and Mechanical Properties of Automobile Bumper
As a raw material for injection molding bumpers,the melt crystallization behavior and melt rheological behav-ior of modified polypropylene(PP)will have a direct impact on the injection molding cycle and mechanical properties of the bumper.Different modified PP are analyzed through differential scanning calorimetry,scanning electron microscopy,capillary rheology,injection molding flow length and mechanical properties.The results show that the use of high melt index PP,high melt index polyolefin elastomer(POE),and lubricants can improve the fluidity of modified PP.At the same time,high melt index POE with ethylene octene copolymer(EOR)structure can reduce the melting temperature of modified PP.In addition,nucleating agent improves crystallization temperature and mechanical properties.Under vari-ous composite effects,the comprehensive performance of modified PP has been improved,and a modified PP for bumper that can reduce injection molding cycle has been successfully prepared.The injection molding cycle of the bumper has been shortened from 78 s to 62 s,and the working efficiency has been improved by about 20％.
万方数据
维普
