滑石粉填充聚丙烯材料注塑微发泡性能  

Microcellular Foaming Behavior of PP/Talc Composites by Injection

作　　者：王琪 卢朝亮 李振华 付大炯 林荣涛 雷亮 孙刚 吴国峰 杨波 罗忠富 叶南飙 Wang Qi;Lu Chaoliang;Li Zhenhua;Fu Dajiong;Lin Rongtao;Lei Liang;Sun Gang;Wu Guofeng;Yang Bo;Luo Zhongfu;Ye Nanbiao(Kingfa Sci.&Tech.Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]金发科技股份有限公司,广州510663

出　　处：《工程塑料应用》2018年第10期17-23,29,共8页Engineering Plastics Application

摘　　要：采用轴心后退的二次开模设备制备滑石粉填充聚丙烯(PP)微发泡复合材料,系统考察发泡剂种类、滑石粉目数、注塑温度和高熔体强度PP助剂对PP微发泡性能的影响。结果表明:相同发气量下,分解起始温度低的发泡剂和5 000目滑石粉有助于提高泡孔密度,同时降低注塑温度至170℃,添加20%的高分子量高熔体强度PP助剂有利于提升泡孔孔壁结构的强度,约束气泡无法进一步增长,从而获得微细的分布均匀致密的泡孔结构,平均孔径小于75μm,该结构状态下的微发泡样品的力学性能保持率得以大幅提升。The microcellular foamed PP/Talc composites were prepared by core-back injection foaming technology.The effects of chemical foaming agent,talc,injection temperature and high melt strength polypropylene on properties of PP foams,including cell size,size distribution and mechanical performance were investigated thoroughly.The results show that proper chemical foaming agent and talc with small particle size of 3μm could increase the cell density.With the addition of high melt strength polypropylene under low injection temperature of 170℃,it is helpful to improve the strength of cell wall and restrict the growth of bubble.Both effects lead to decrease the cell diameter and obtain dense pore microcellular structure with average cell size of 75μm,which give an obvious enhancement of mechanical properties of composites.

关 键 词：聚丙烯 滑石粉 注塑 微发泡 化学发泡剂 泡孔结构 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]