Preparation method of conductive 3D printing supplies by using double screw extruder

The invention discloses a preparation method of conductive 3D printing supplies by using a double screw extruder. The method is as below: dispersing multi-walled carbon nanotubes in acetone, mixing uniformly into an ink-like state; adding a thermoplastic resin particles in a stirring tank, uniformly spraying the multi-walled carbon nanotube acetone dispersion liquid on the surface of the resin particles in the stirring process, and continuing stirring; taking out the thermoplastic resin particles coated by the multiple-walled carbon nanotube dispersion liquid, putting in a constant temperature drying box, and drying at the temperature of 60-80 DEG C for 2-6 h; directly adding the dried multi-walled carbon nanotube / resin composite particles into the hopper of a double screw extruder, extruding continuously and uniformly, and adjusting the traction force and traction speed to control the diameter of an extrudateat 1.75mm or 3.0mm, so as to finally obtain the conductive 3D printing supplies. The method of the present invention is simple to operate, and the obtained conductive 3D printing supplies have both good conductivity and mechanical properties.