高电压技术2025，Vol.51Issue(6)：2662-2671,10.DOI:10.13336/j.1003-6520.hve.20240815
乙烯共聚改性聚丙烯电缆绝缘料的结构-性能分析
Structural and Performance Analysis of Ethylene Copolymer Modified Polypropylene Cable Insulation Material
摘要
Abstract
Developing new types of insulated power cable with excellent comprehensive performance and environmental friendliness has become a hot research topic in recent years.Polypropylene(PP)is a thermoplastic material with excellent electrical resistance.When applied to the insulation of power cables,it features a simple manufacturing process without the need for degassing treatment,which is conducive to energy conservation,emission reduction,and efficient utilization in power cable equipment.However,ordinary polypropylene has poor toughness and is prone to brittle fracture at low temperatures,necessitating toughening modification.This paper analyzes the structure and properties of different co-polymerization modified polypropylene,and studies the thermal,mechanical,and electrical properties of ethylene co-polymerization modified polypropylene,long-chain branched polypropylene,and polypropylene containing antioxi-dant components.The test results show that,after ethylene copolymerization modification,the mechanical properties of PP are significantly improved,but changes in the molecular chain structure affect the melt crystallization process of PP insulation materials and deteriorate the dielectric properties of the insulation under high-temperature conditions.Long-chain branching helps synergistically enhance the electro-thermal-mechanical properties of PP materials,reducing the average size of the rubber phase,increasing the crystallization temperature,and effectively controlling the dielectric loss tangent at high temperatures.This study can provide guidance for the development and reliable application of poly-propylene cable materials.关键词
聚丙烯/共聚改性/长链支化/热特性/电气性能/机械性能Key words
polypropylene/co-polymerization modification/long chain branching/thermal characteristics/electrical performance/mechanical performance引用本文复制引用
赵鹏,欧阳本红,宁昕,王安哲,隋浩然,武康宁..乙烯共聚改性聚丙烯电缆绝缘料的结构-性能分析[J].高电压技术,2025,51(6):2662-2671,10.基金项目
国家电网公司科技项目(5500-202319121A-1-1-ZN).Project supported by Science and Technology Project of SGCC(5500-202319121A-1-1-ZN). （5500-202319121A-1-1-ZN）
