▎ 摘　　要

NOVELTY - Preparing polypropylene-based cable insulating material, involves (a) placing carbon black powder in a heating furnace, sealing the furnace body, introducing argon for protection, heating at 1100℃ in an argon atmosphere, keeping the temperature for 10-15 minutes, stopping introducing argon, introducing methane and hydrogen, and keeping the temperature for 4-5 hours at 1100℃, where the flow volume ratio of the methane and hydrogen is 1: 5-6, and the total gas flow is 120-140 mL/min, then stopping introducing methane and hydrogen, introducing argon into the heating furnace again, stopping heating, and performing air cooling to normal temperature under the protection of argon to obtain the graphene powder, (b) preparing an ethanol solution of octadecylamine, dispersing the graphene powder in ethanol to obtain a suspension, and carrying out water bath on the suspension at a constant temperature of 70±5℃. USE - Method for preparing polypropylene-based cable insulating material. ADVANTAGE - The polypropylene material has excellent mechanical property and heat resistance, is suitable for working occasions needing to bear larger stress or working in higher temperature environment, and has good comprehensive performance. DETAILED DESCRIPTION - Preparing polypropylene-based cable insulating material, involves (a) placing carbon black powder in a heating furnace, sealing the furnace body, introducing argon for protection, heating at 1100℃ in an argon atmosphere, keeping the temperature for 10-15 minutes, stopping introducing argon, introducing methane and hydrogen, and keeping the temperature for 4-5 hours at 1100℃, where the flow volume ratio of the methane and hydrogen is 1: 5-6, and the total gas flow is 120-140 mL/min, then stopping introducing methane and hydrogen, introducing argon into the heating furnace again, stopping heating, and performing air cooling to normal temperature under the protection of argon to obtain the graphene powder, (b) preparing an ethanol solution of octadecylamine, dispersing the graphene powder in ethanol to obtain a suspension, carrying out water bath on the suspension at a constant temperature of 70±5℃, adding the ethanol solution of octadecylamine into the suspension in a stirring state, continuously stirring the suspension for more than 20 hours, then carrying out air cooling to normal temperature, carrying out solid-liquid separation, washing a solid phase with ethanol, and drying to obtain surface-modified graphene powder, (c) dispersing the surface-modified graphene powder in an ethanol aqueous solution to form a mixed solution, keeping the temperature of the mixed solution constant to 50±2℃ in a water bath under the nitrogen protection atmosphere, then adding gamma-methacryloxypropyltrimethoxysilane into the mixed solution, keeping the temperature constant for 4-5 hours, cooling to the normal temperature under the nitrogen protection atmosphere, taking out the mixed solution, carrying out solid-liquid separation, washing a solid phase with absolute ethanol, and drying to obtain a solid phase A, (d) preparing an aqueous solution of ammonium sulfate, adding the solid phase A into the aqueous solution of ammonium sulfate, stirring the solution for 50-60 minutes under a nitrogen protection atmosphere ultrasonic environment, then carrying out water bath on the solution at a constant temperature of 60±2℃, adding acrylamide and acrylic acid into the solution under a nitrogen protection atmosphere ultrasonic stirring state, continuing to carry out ultrasonic stirring under the nitrogen protection atmosphere for 15-20 minutes, then adding polyvinylpyrrolidone, ammonium persulfate and sodium bisulfite into the solution under the nitrogen protection atmosphere ultrasonic stirring state, carrying out ultrasonic stirring under the nitrogen protection atmosphere for more than 4 hours, cooling to normal temperature under the nitrogen protection atmosphere, taking out a mixed solution, carrying out solid-liquid separation, washing the solid phase with absolute ethyl alcohol, and drying to obtain a graphene component, and (e) uniformly mixing the graphene component, polypropylene, an antioxidant and calcium stearate in an extruder, extruding and granulating, and then carrying out injection molding on granules to obtain the insulating material.