▎ 摘　　要

NOVELTY - Preparing composite conductive fiber comprises e.g. (i) adding activated graphene, carboxylated carbon nanotubes, polypropylene chips, high-density polyethylene slices in a high-speed mixer, mixing in a twin-screw extruder, quenching extruded material in a water bath at 20-30 degrees C, tracking into the pelletizer section to obtain composite pellets, (ii) spraying composite pellets on a tray, spun pellets in a vertical melt spinning machine to obtain primary filament, and (iii) drying the primary filament, oiling, drafting roller drawing, and winding cones to obtain final product. USE - The method is useful for preparing composite conductive fiber (claimed). ADVANTAGE - The method is simple and is suitable for industrial production; and composite conductive fiber has good mechanical properties and electrical conductivity. DETAILED DESCRIPTION - Preparing composite conductive fiber comprises (i) adding activated graphene, carboxylated carbon nanotubes, polypropylene chips, high-density polyethylene slices in a high-speed mixer, mixing at 500-4000 revolution/minute speed for 3-35 minutes, where mass ratio between carboxylated carbon nanotube and graphene is 1:0.5-200, mass ratio between high-density polyethylene slice and polypropylene chips is 1:1-100, total mass fraction of the conductive filler composed of the activated graphene and carboxylated carbon nanotubes is 0.05-30%; fractionating mixture, mixing in a twin-screw extruder, quenching extruded material in a water bath at 20-30 degrees C, tracking into the pelletizer section to obtain composite pellets, (ii) spraying composite pellets on a tray, placing in a vacuum oven at 80-120 degrees C for 6-12 hours, spun pellets in a vertical melt spinning machine to obtain primary filament, and (iii) drying the primary filament, oiling, drafting roller drawing, and winding cones to obtain final product.