▎ 摘　　要

NOVELTY - Shielding material comprises 50-70 pts. wt. polypropylene, 30-50 pts. wt. polyethylene octene co-elastomer, 10-20 pts. wt. conductive carbon black, 0.5-1.5 pts. wt. graphene, 0.5-1.5 pts. wt. coupling agent and 1-3 pts. wt. antioxidant. USE - The shielding material is useful for polypropylene-based thermoplastic cables. ADVANTAGE - The shielding material forms a synergistic effect with carbon black by adding graphene to improve electrical conductivity, graphene masterbatch made by ultrasonic dispersion and solution method, overcomes problem of serious stacking and agglomeration of graphene layers, and obtains better electrical and mechanical properties, and in case of meeting the electrical conductivity, and has a lower resistivity and positive temperature effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing polypropylene-based thermoplastic cable shielding material comprising (i) taking 50-70 pts. wt. polypropylene, 30-50 pts. wt. polyethylene octene co-elastomer, 10-20 pts. wt. conductive carbon black, 0.5-1.5 pts. wt. graphene, 0.5-1.5 pts. wt. coupling agent and 1-3 pts. wt. antioxidant, adding polyethylene octene co-elastomer into first solvent, stirring evenly at 100-120 degrees C, obtaining a polyolefin elastomerssolution, adding graphene into the second solvent, ultrasonically vibrating for 10-30 minutes, ultrasonic power is 150-300 w, and the graphene slurry after ultrasonic dispersion is obtained, (ii) adding the graphene slurry to the polyolefin elastomers solution and stirring evenly under heating to obtain a polyolefin elastomers/graphene mixed liquid, suction filtering polyolefin elastomers/graphene mixture to obtain a flocculent mixture, and drying to obtain a polyolefin elastomers /graphene masterbatch, (iii) mixing polypropylene, conductive carbon black, polyolefin elastomers/graphene masterbatch, adding antioxidant and coupling agent into extruder and melt blending at 180-210 degrees C, performing water-cooled pelletizing, drying and dehydration