中国塑料 ›› 2022, Vol. 36 ›› Issue (7): 37-43.DOI: 10.19491/j.issn.1001-9278.2022.07.006

• 材料与性能 • 上一篇    下一篇

薄壁注塑透明聚丙烯专用料的结构与性能分析

刘义(), 孙伟, 曲国兴, 王叶, 袁宁, 杨少林, 许霞, 常小毅, 张宇飞   

  1. 国能新疆化工有限公司,乌鲁木齐 831404
  • 收稿日期:2022-02-21 出版日期:2022-07-26 发布日期:2022-07-20
  • 作者简介:刘义(1983—),工程师,研究方向为合成树脂分析测试技术,124347089@qq.com
  • 基金资助:
    国家能源集团科技创新项目(GJNY?20?22)

Structure and performance analysis of transparent polypropylene special material for thin⁃wall injection molding

LIU Yi(), SUN Wei, QU Guoxing, WANG Ye, YUAN Ning, YANG Shaolin, XU Xia, CHANG Xiaoyi, ZHANG Yufei   

  1. CHN Energy Xinjiang Chemical Co,Ltd,Urumqi 831404,China
  • Received:2022-02-21 Online:2022-07-26 Published:2022-07-20

摘要:

对市场上常见的4种薄壁注塑透明聚丙烯专用料的熔融结晶性能、光学性能、分子量分布、力学性能、毛细管流变性能、热收缩性能等进行对比分析。结果表明,K4860H与其他3种透明聚丙烯专用料相比分子量分布最窄;K4860H相对于其他3种透明聚丙烯专用料具有更好的韧性和透明性;相对其他2种透明聚丙烯,K4860H和MT45S具有更高的结晶温度和更快的结晶速率,表明其具有更为优良的结晶能力;4种透明聚丙烯样品的黏度随剪切速率的变化规律相同,表明其具有相同的加工流变性能;K4860H和500B 2个方向的模塑收缩率接近,说明其具有良好的尺寸稳定性;基于以上对比分析可知K4860H主要性能指标优于对比的3种聚丙烯专用料。

关键词: 聚丙烯, 透明, 薄壁注塑, 结构, 性能, 分析

Abstract:

This paper reported an investigation on the melt crystallization properties, optical properties, molecular weight distribution, mechanical properties, capillary rheological properties, and thermal shrinkage properties of four types of transparent polypropylene (PP) specialized for injection molding. The results indicated that the K4860H?type PP presented a narrower molecular weight distribution, better toughness, and a higher transparency degree than the other three types of PP. The K4860H?type and MT45S?type PP exhibited higher crystallization temperatures and faster crystallization rates than the other two types of PP, representing a better crystallization capability. Moreover, the K4860H?type PP showed a similar molding shrinkage to the 500B?type one, indicating a good dimensional stability for thin?wall injection molding. Based on the above analysis, the main performance of the K4860H?type PP is superior to that of the other three types of PP.

Key words: polypropylene, transparency, thin?wall injection molding, structure, performance, analysis

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