中国塑料 ›› 2019, Vol. 33 ›› Issue (1): 29-32.DOI: 10.19491/j.issn.1001-9278.2019.01.006

• 材料与性能 • 上一篇    下一篇

TPEX材料的制备及性能研究

段凯歌,程志,胡明远,于东明,徐俊正,倪佳   

  1. 曼瑞德集团有限公司聚合物实验室
  • 收稿日期:2018-08-12 修回日期:2018-10-08 出版日期:2019-01-26 发布日期:2019-02-25

Study on Preparation and Performance of Thermoplastic Cross-linked Polyethylene

  • Received:2018-08-12 Revised:2018-10-08 Online:2019-01-26 Published:2019-02-25

摘要: 选取高密度聚乙烯(PE-HD)和耐热聚乙烯(PERT)共混体系进行交联改性得到一种新型的热塑性交联聚乙烯(TPEX)材料,使其即保留PERT的热塑性又因为部分交联提高了其耐热性和抗蠕变性[交联聚乙烯(PEX)];对TPEX材料进行了拉伸、弯曲、冲击等力学性能的测试;采用定伸热强度和动态热力学分析仪来表征材料的热强度和拉伸蠕变性能。结果表明,当熔体质量流动速率为1~2 g/10 min(21.6 kg)时,其交联度为(2±1) %,TPEX的综合性能较好,可以满足材料加工应用;维卡软化点温度达到126.1 ℃,具有良好的耐热性能; TPEX的定伸热强度大于PERT与PEX,动态热力学分析仪拉伸蠕变测试TPEX与PEX接近,能够满足工程需要。

Abstract: A new type of thermoplastic cross-linked polyethylene (TPEX) was prepared by crosslinking of PE-HD and PERT blends. This method not only maintained the thermoplasticity of PERT but also improved its heat resistance and creep resistance close to PEX due to partial crosslinking. TPEX gained the optimum comprehensive properties at a melt flow rate of 1~2 g/10 min and a crosslinking degree of (2±1) %, which met the requirement for processing and applications. TPEX also exhibited good heat resistance with a Vicat softening point of 126.1 ℃. The thermal strength and tensile creep properties of TPEX were characterized by thermal tensile strength at a given elongation and dynamic mechanical analysis. The results indicated that TPEX had higher thermal strength than PERT and PEX but similar creep resistance with PERT and PEX.