中国塑料 ›› 2021, Vol. 35 ›› Issue (1): 13-18.DOI: 10.19491/j.issn.1001-9278.2021.01.003

• 材料与性能 • 上一篇    下一篇

聚乙烯树脂熔体拉伸流变性能研究

王帆1, 马宗立2, 杜斌1, 李稳3, 王多鹏2, 陈商涛1, 王艳芳1()   

  1. 1.中国石油石油化工研究院,北京 102200
    2.中国石油华南化工销售公司,广州 510655
    3.中国石油抚顺石化分公司,辽宁 抚顺 113006
  • 收稿日期:2020-06-02 出版日期:2021-01-26 发布日期:2021-01-22

Study on Tensile Rheological Properties of Polyethylene Melt

WANG Fan1, MA Zongli2, DU Bin1, LI Wen3, WANG Duopeng2, CHEN Shangtao1, WANG Yanfang1()   

  1. 1.Petrochina Petrochemical Research Institute,Beijing 102200,China
    2.Petrochina South China Chemicals Marketing Company,Guangzhou 510655,China
    3.Petrochina Fushun Petrochemical Company,Fushun 113006,China
  • Received:2020-06-02 Online:2021-01-26 Published:2021-01-22
  • Contact: WANG Yanfang E-mail:wangfan010@petrochina.com.cn

摘要:

选取了3种不同分子链结构的聚乙烯树脂,采用SER(sentmanat extensional rheometer)夹具旋转流变仪、熔体拉伸流变仪分别研究了其熔体瞬态拉伸黏度、熔体拉伸强度和拉伸黏度等流变性能。结果表明,随Hencky形变的增大,高密度聚乙烯(PE-HD)100N的熔体瞬态拉伸黏度的增长趋势逐渐放缓;低密度聚乙烯(PE-LD)2420F出现明显的拉伸硬化现象,熔体瞬态拉伸黏度急剧增大;线形低密度聚乙烯(PE-LLD)7050熔体拉伸黏度较低,迅速形成平台后开始减小; 3个样品中100N的熔体强度和拉伸黏度均高于2420F和7050,7050最低。

关键词: 聚乙烯, 拉伸流变, 拉伸黏度, 加工性能

Abstract:

The rheological properties of three types of polyethylene resins with different molecular chain structures were investigated by using a rotary rheometer (sentmanat extensional rheometer) and a melt tensile rheometer. These rheological properties include melt transient tensile viscosity, melt tensile strength and tensile viscosity. The results indicated that the growth of the transient tensile viscosity of PE-HD-100N melt tended to slow down gradually with an increase in the Hencky deformation. There was an obvious transient tensile hardening phenomenon appearing in PE-LD-2420F, and the tensile viscosity of its melt increased sharply. The tensile viscosity of the melt of PE-LLD-7050 was low, and it began to decrease after the rapid formation of the platform. The test result of melt tensile indicated that the melt strength and tensile viscosity of PE-HD-100N were higher than those of PE-LD-2420F and PE-LLD-7050. PE-LLD-7050 presented the lowest melt strength and tensile viscosity.

Key words: polyethylene, tensile rheology, tensile viscosity, processing performance

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