超临界N_2及CO_2注塑发泡聚丙烯性能对比研究  

Comparative Study on the Properties of Injection Foamed Polypropylene by Using Supercritical N_2 and CO_2

作　　者：付大炯 王琪 李振华 孙刚 杨波 郑文革 罗忠富 FU Da-jiong;WANG Qi;LI Zhen-hua;SUN Gang;YANG Bo;ZHENG Wen-ge;LUO Zhong-fu(Kingfa Science & Technology Co. , Ltd. , Guangzhou 510663, China;Ningbo Institute of Materials Technology and Engineering, University of Chinese Academy of Sciences, Ningbo 315201, China)

机构地区：[1]金发科技股份有限公司,广东广州510663 [2]中国科学院大学宁波材料技术与工程研究所,浙江宁波315201

出　　处：《塑料工业》2018年第11期81-84,共4页China Plastics Industry

摘　　要：采用具有二次开模功能的注塑发泡机,对比研究了不同开模距离条件下超临界氮气(N_2)以及二氧化碳(CO_2)对改性聚丙烯(PP)的发泡性能。研究发现,相同的开模距离条件下,超临界N_2发泡PP相比超临界CO_2发泡PP具有更多更小的泡孔,具有更高的减重比例;减重比例大,力学性能保持率则较低。而开模距离越大,泡孔更容易发生合并的现象。The comparison of foaming properties of polypropylene(PP) with supercritical nitrogen(N2) and carbon dioxide(CO2) as the foaming agents by injection foaming machine with core-back function was investigated. The results show that at the same core-back distance supercritical N2 foamed PP has smaller cell sizes than supercritical CO2 foamed PP,which means higher weight reduction. As the increase of the weight reduction,the retention of mechanical properties of PP is reducing. And as the increase of core-back distance,there would be more cell rupture and amalgamation.

关 键 词：聚丙烯 二次开模 超临界流体 氮气 二氧化碳 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] TQ328