Study on Polypropylene Based Shielding Material for High Voltage DC Cable

Polypropylene (PP) resin is a promising thermoplastic high-voltage direct current (HVDC) cable material by virtue of its excellent heat resistance, mechanical and physical properties, insulation properties, and environmental protection and energy saving advantages. However, the current research focuses on polypropylene insulating materials, and less research on semi-conductive shielding materials for high-voltage direct current. In this paper, PP is the basic skeleton of semiconducting shielding materials, styrene-ethylene-butylene-styrene block copolymer (SEBS) as a toughening and dispersion of carbon black main body to join the processing aids to make their own semiconducting shielding materials, through the selection of different content of ethylene propylene rubber phase of PP, to study the impact of its shielding material carbon black dispersion, and further study of the semiconducting shielding layer on the insulating layer at high temperatures and high fields under the charge transport behavior. The experimental results show that PP with high rubber phase content as the skeleton carbon black dispersion and various properties are superior to the composite system with low rubber phase content. The composite system with high rubber phase content has good matching characteristics with the space charge of the insulation layer under high temperature and high field, proving that the semiconductor material developed in this paper can reduce the injection behavior of charges under high temperature and high field.