聚丙烯注射成型收缩研究进展  

Research Progress in Shrinkage of Injection-molded Polypropylene

作　　者：徐亚君[1] 杨伟[1] 单桂芳[1] 谢邦互[1] 杨鸣波[1] 

机构地区：[1]四川大学高分子材料科学与工程学院,高分子材料工程国家重点实验室,四川成都610065

出　　处：《中国塑料》2009年第2期1-7,共7页China Plastics

基　　金：国家自然科学基金项目(20734005)

摘　　要：在介绍注射成型中浇口凝固前收缩、制品模内冷却过程收缩及脱模后制品自由收缩的收缩过程和热收缩、结晶收缩、取向收缩、负收缩及后收缩等注射成型收缩原因的基础上,详细回顾了聚丙烯(PP)分子结构、共混、填充及加入成核剂等因素对注射成型收缩率的影响。同时,还讨论了注射温度、成型压力、成型时间、模具温度、冷却时间、充模速度等注塑工艺条件以及制品厚度对PP注射成型收缩率的影响,介绍了生产中注射成型收缩的控制方法。An introduction was given on various shrinkage process in injection molding, including the shrinkage before gate freezing, that of the part in mold during the cooling stage, and that after demoulding. The origin of the shrinkage was sorted to thermal contraction, crystal shrinkage, orientation shrinkage, negative shrinkage, and post shrinkage. The effects on the shrinkage of PP parts were discussed, including molecular characteristics, blending, compounding, and nucleation. The influence of injection parameters, such as including injection temperature, molding pressure, molding time, mold temperature, cooling time, filling speed, and part thickness were also summarized. In the end, the methods of controlling the shrinkage of PP in production process were also referred.

关 键 词：聚丙烯 收缩 注射成型 结晶 取向 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]