摘要
开发综合性能优良和环境友好的新型绝缘电力电缆成为近年来研究的热点问题。聚丙烯作为热塑性材料,耐电性能优异,在应用于电力电缆绝缘时制造工艺简单,无需脱气处理,有利于电力电缆装备的节能减排和高效利用。然而,普通聚丙烯韧性差,在低温下容易发生脆断,必须进行增韧改性。该文针对不同组分共聚改性聚丙烯的结构性能进行表征分析,分别研究了乙烯共聚改性聚丙烯、长链支化聚丙烯和含抗氧剂组分共聚聚丙烯的热、机械和电气性能。测试结果表明:乙烯共聚改性后聚丙烯的机械性能得到显著提升,但是分子链结构的变化会对聚丙烯绝缘料的熔融结晶过程产生影响,并劣化绝缘在高温条件下的介电性能,通过长链支化有助于聚丙烯材料电-热-机械性能的协同提升,使得橡胶相平均尺寸减小,结晶温度提升,高温下介质损耗角正切值得到有效控制,可以为聚丙烯电缆料的开发和可靠应用提供指导。
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 antioxidant 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 polypropylene cable materials.
作者
赵鹏
欧阳本红
宁昕
王安哲
隋浩然
武康宁
ZHAO Peng;OUYANG Benhong;NING Xin;WANG Anzhe;SUI Haoran;WU Kangning(State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan 430074,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;State Grid Corporation of China,Beijing 100031,China)
出处
《高电压技术》
北大核心
2025年第6期2662-2671,共10页
High Voltage Engineering
基金
国家电网公司科技项目(5500-202319121A-1-1-ZN)。
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
polypropylene
co-polymerization modification
long chain branching
thermal characteristics
electrical performance
mechanical performance
