摘要
为优化聚丙烯(PP)基绝缘料的电气性能、力学性能及长时挤出工艺,通过熔融共混PP与苯乙烯-异戊二烯嵌段共聚物(SIS)弹性体制备了不同SIS含量的PP/SIS复合绝缘料,对不同SIS弹性体含量绝缘料的微观结构、介电性能、电气强度、拉伸强度及连续挤出性能等进行了系统研究。结果表明:随着SIS含量的增加,SIS与PP产生分子链段融合纠缠,使得绝缘料整体晶粒尺寸和结晶度逐渐减小,并导致绝缘料的电气强度及机械强度呈现不同程度的下降趋势。在SIS质量分数为30%时,绝缘料的体积电阻率达到最大值1.55×10^(16)Ω·m,介质损耗因数达到较低值3.3×10^(-4),同时拉伸强度达到37.4 MPa,相较于纯PP基料的拉伸强度仅下降14.2%,断裂伸长率达到1 806%。此外,该绝缘料的双螺杆挤出扭矩波动为3.8%,机头压力波动为4.5%,挤出性能较为稳定。
To enhance the electrical and mechanical properties and ensure stable long-term extrusion of polypropylene(PP)-based insulating materials,PP/SIS composite insulating materials with different content of styrene-isoprene-styrene(SIS)elastomer were prepared through melt blending,and their microstructure,dielectric properties,electric strength,tensile strength,and continuous extrusion performance were systematically investigated.The results reveal that with the increase of SIS content,the molecular chain entanglement between SIS and PP is enhanced,which results in decrease of the grain size and crystallinity and moderate decline of the electric strength and mechanical strength.When the mass fraction of SIS is 30%,the volume resistivity of insulating materials attain the hithest value 1.55×10^(16)Ω·m,the dielectric loss decrease to 3.3×10^(-4),the tensile strength is 37.4 MPa,which decrease by only 14.2%compared to the PP,while the elongation at break reach 1806%.Furthermore,the twin-screw extruder torque fluctuation of the insulating materials is 3.8%,and the head pressure fluctuation is 4.5%,indicating stable extrusion performance.
作者
祝文亲
周洋
李石琨
窦彤彤
陈商涛
杜斌
史晓宁
李文鹏
张翀
ZHU Wenqin;ZHOU Yang;LI Shikun;DOU Tongtong;CHEN Shangtao;DU Bin;SHI Xiaoning;LI Wenpeng;ZHANG Chong(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Petrochemical Research Institute of PetroChina,Beijing 102206,China;State Key Laboratory of Advanced Power Transmission Technology,China Electric Power Research Institute,Beijing 102209,China)
出处
《绝缘材料》
北大核心
2025年第10期33-42,共10页
Insulating Materials
关键词
SIS
结晶行为
电气性能
力学性能
长时挤出
SIS
crystallization behavior
electrical performance
mechanical properties
long-term extrusion
