汽车吹塑发泡风管用聚丙烯材料性能

Properties of Polypropylene Used in Automobile Blow Molding and Foaming Air Duct

采用高熔体强度聚丙烯及高冲击强度聚丙烯进行共混改性制备出混合聚丙烯材料,对其熔体性能和力学性能进行分析,并将不同混合比例的聚丙烯材料采用吹塑工艺成型同时发泡制成汽车风管,对材料的发泡性能进行分析。结果表明,高熔体强度和高冲击强度的聚丙烯材料均具有较低的熔体流动速率,混合材料的物性随着混合比例变化趋势而变化,总体呈现刚韧平衡。高熔体强度材料及配比为70∶30和50∶50的混合材料能够实现吹塑发泡成型,材料的吹塑发泡性能随着高冲击性能聚丙烯添加比例的增大呈先提升后下降的趋势,当高熔体强度和高冲击强度聚丙烯混合比例为70∶30时,材料的发泡性能最佳,与其他材料相比,其泡孔尺寸、泡孔体积均较高,实现了零件的轻量化。

High melt strength polypropylene and high impact strength polypropylene were modified to prepare mixed polypropylene.The melt properties and mechanical properties of the mixed PP were analyzed.The mixed materials were also blow molded and foamed into the automobile air duct,and the foaming performance of the air duct was analyzed.The results showed that the high melt strength polypropylene and the high impact strength polypropylene had low melt flow rate,and the physical properties of the mixed materials changed with the mixing ratio,showed balance of toughness and rigidity.The high melt strength polypropylene and the blended materials with the proportion 70∶30 and 50∶50 could complete blow molding and foaming at the same time.The blowing and foaming performances of them increased first and then decreased with the increase of the proportion of high impact strength polypropylene.When the mixing ratio was 70∶30,the foaming performance was the best.The cell size and cell volume were higher than other materials,which could effectively realize the lightweight of parts.