超临界CO_2发泡聚丙烯挤出工艺研究  

EXPERIMENTAL INVESTIGATION ON EXTRUSION FOAMING OF POLYPROPYLENE BY SUPERCRITICAL CO_2

作　　者：钱敏伟[1] 信春玲[1] 郭奕崇[1] 何亚东[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《工程塑料应用》2007年第3期23-26,共4页Engineering Plastics Application

摘　　要：通过对普通等规聚丙烯(PP)共混改性,实现PP的超临界CO2挤出发泡成型。考察了熔体温度、机头压力和CO2浓度对改性PP发泡过程和泡孔结构的影响。采用优化的工艺参数制备出发泡倍率高、泡孔形态完整的改性PP发泡材料。Polypropylene foam was well extruded by using supercritical CO2 and blending conventional linear polypropylene with a small proportion of grafted polyethylene. The main processing parameters of foaming extrusion such as melt temperature, die pressure and concentration of supercritical CO2 were investigated. Effects of these processing parameters on foaming process and cell structure were studied. Polypropylene foams of good cell structure and cell integrity was obtained by optimized parameters.

关 键 词：聚丙烯超 临界CO2 挤出发泡 泡孔密度 泡孔尺寸 

分 类 号：TQ028.32[化学工程]