聚丙烯高压电缆半导电屏蔽料增韧改性研究OA

In this work,a semi-conductive shielding material for polypropylene(PP)high-voltage cables was prepared,with PP as the matrix resin,conductive carbon black(CB)as the conductive filler,and ethylene-propylene random copo-lymer(EPR)as the toughening elastomer,which is well-known for its excellent interfacial compatibility with PP.The effects of CB and EPR contents on the microstructure,crystallization behavior,mechanical properties,and electrical properties of the shielding material were comprehensively investigated.The results indicated that when the CB content is 27 wt%,the volume resistivity of the shielding material reaches 4.8 Ω·cm at 23℃and 11.9 Ω·cm at 90℃,indicating the formation of a stable conductive network.With the addition of 30 wt%EPR,the shielding material exhibits a tensile strength of 12.1 MPa and an elongation at break as high as 804.1%.Meanwhile,the flexural modulus and hardness de-crease to 250.8 MPa and 44.3,respectively,and the impact strength is increased by 44%compared with that of the shielding material without EPR.The EPR elastomer forms a uniformly distributed microstructure in the PP matrix,and the good interfacial compatibility between EPR and PP facilitates the uniform dispersion of CB in the EPR/PP biphasic matrix,thus maintaining an effective continuous conductive network.This research provides key data support for the de-velopment of high-performance semi-conductive shielding materials for PP high-voltage cables,laying a theoretical and experimental foundation for their practical engineering application.