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

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of 3D printing consumables, in particular to a method for preparing conductive 3D printing consumables by using a twin-screw extruder. Background technique [0002] Different from traditional material processing methods, additive manufacturing is mainly based on 3D CAD model data. By adding materials and manufacturing layer by layer, a 3D physical entity that is completely consistent with the corresponding mathematical model is directly produced, commonly known as "3D printing" or "3D printing". . Because it can automatically, directly, quickly and accurately transform design ideas into prototypes with certain functions or directly manufacture parts, it provides a high-efficiency and low-cost implementation method for parts prototype production and verification of new design ideas. 3D printing is widely used in the fields of electronic products, automobiles, aerospace, medical treatment, military industry, ...

AI Technical Summary

Problems solved by technology

[0005] However, the amount of nano-conductive agent needed to prepare conductive printing consumables is often large, which will make the material brittle and poor in ductility

In addition, the price of nano-conductive materials is relatively high, which also increases the manufacturing cost of printing consumables

At present, there is no solution that can take into account the electrical conductivity and mechanical properties of composite materials