中国塑料 ›› 2012, Vol. 26 ›› Issue (06): 62-66 .DOI: 10.19491/j.issn.1001-9278.2012.06.011

• 加工与应用 • 上一篇    下一篇

聚丙烯的流变性能和PVT关系研究及在注塑成型中的应用

李峰 孙晋 李永泉   

  1. 中国石化北京化工研究院
  • 收稿日期:2012-02-01 修回日期:2012-04-05 出版日期:2012-06-26 发布日期:2012-06-26

Combined Analysis of Rheological Properties and PVT Relationships of Polypropylene for Injection Molding

SUN Jin   

  • Received:2012-02-01 Revised:2012-04-05 Online:2012-06-26 Published:2012-06-26
  • Contact: SUN Jin

摘要: 研究了聚丙烯在不同温度下的剪切流变性能和压力-比容-温度(PVT)关系,并分别采用7参数的Cross-WLF黏度模型和修正的双域Tait状态方程拟合其变化曲线。在确定注塑工艺参数的条件下,通过PVT状态曲线描述了整个注射成型过程,计算出其理论体积收缩率为5.58 %,并与实际注塑样条测量所得的收缩率5.46 %相一致。

关键词: 聚丙烯, 注射成型, 流变性能, 压力-比容-温度关系, 收缩率

Abstract: The rheological properties and pressure-volume-temperature(PVT) relationships of polypropylene(PP) were studied using seven-parameter-Cross-WLF viscosity model and modified two-domain Tait state equation. Under defined molding conditions, the whole injection molding process could be described. The theoretical volumetric shrinkage of PP was calculated to be 5.58 %, which was approximate to the practical measured value of 5.46%.

Key words: polypropylene, injection molding, rheological property, pressure-volume-temperature relationship, shrinkage

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