乙烯共聚调控晶态结构对聚丙烯电缆绝缘料电气性能的影响  

Effect of Regulating Crystalline Structure by Copolymerizing with Ethylene on the Electrical Performance of Polypropylene Cable Insulation Materials

作　　者：杨凯[1] 任颙若 李建英[1] 景政红[2] 欧阳本红 赵鹏 YANG Kai;REN Yongruo;LI Jianying;JING Zhenghong;OUYANG Benhong;ZHAO Peng(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Sinopec Yanshan Petrochemical Company,Beijing 102500,China;State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]中国石油化工股份有限公司北京燕山分公司,北京102500 [3]中国电力科学研究院有限公司电网环境保护国家重点实验室,武汉430074

出　　处：《高电压技术》2023年第3期982-989,共8页High Voltage Engineering

基　　金：中国石化科技项目(421060);电力设备电气绝缘国家重点实验室自主课题(EIPE22113)。

摘　　要：为了揭示乙烯共聚对聚丙烯电缆绝缘电气性能的影响机制,通过2阶段抗冲共聚工艺合成了3种不同乙烯-丙烯共聚物(ethylene-propylene copolymer,EPR)含量的抗冲共聚聚丙烯(impact polypropylene copolymer,IPC),研究了其晶型、球晶形貌、相态分布、陷阱分布特性,以及机械、电气性能的变化。结果表明,通过共聚法引入15%的EPR时,结晶度相较等规聚丙烯下降约6.8%,断裂伸长率显著提升,拉伸模量降低37.4%,电荷注入阈值场强与击穿强度分别提升17.7%和8.0%。引入30%的EPR时,结晶度相较等规聚丙烯下降可达30.6%,同时断裂伸长率及击穿强度均显著降低。乙烯共聚对宏观性能的影响被证明可能与EPR“附生”在球晶上的特殊结构密切相关。研究表明适当的乙烯共聚可实现聚丙烯电缆绝缘机械、电气性能的协同优化,研究结果可为聚丙烯绝缘综合性能调控提供参考。In order to reveal the influence mechanism of ethylene copolymerization on the electrical properties of polypropylene(PP)cable insulation,we synthesized three types of impact PP copolymer(IPC)with different ethylenepropylene copolymer(EPR)content by two-stage impact copolymerization process,and investigated the variation of crystal structure,spherulite morphology,phase and trap distribution,mechanical and electrical properties.Results show that,when 15%EPR is introduced,the crystallinity and tensile modulus are reduced by about 6.8%and 37.4%compared with isotactic PP,whereas,the elongation at break obviously increases.The charge injection threshold field strength and breakdown strength are increased by 17.7%and 8.0%,respectively.When 30%EPR is introduced,the crystallinity decreases by 30.6%compared with isotactic PP.Meanwhile,the breakdown strength and elongation at break are still dropped.The effect of ethylene copolymerization on the macroscopic properties has been proved to be closely related to the special structure of EPR“epigenous”on the spherulites in IPC15.This study shows that proper ethylene copolymerization can realize the synergistic optimization of the mechanical and electrical properties of PP cable insulation,which can provide a reference for the regulation of comprehensive properties.

关 键 词：共聚聚丙烯 电缆绝缘 晶态结构 机械性能 电气性能 

分 类 号：TM75[电气工程—电力系统及自动化]