Preparation method of conductive composite material

Abstract

The invention provides a preparation method of a conductive composite material and belongs to the field of material preparation. The preparation method is characterized by comprising the following steps: soaking graphene micro-flakes and an ultrahigh-molecular weight polyethylene powder in ethanol and performing ultrasonic dispersion by use of an ultrasonic cell smasher to form a uniformly distributed suspension; performing suction filtration and vacuum drying to remove the ethanol solvent, so that the graphene micro-flakes are evenly attached on the surface of the ultrahigh-molecular weight polyethylene particles; finally, performing compression molding on the obtained material, and then cooling to a room temperature under a constant pressure, thereby obtaining a raw material. The preparation process is improved, so that a more complete and stable effective conductive network structure can be formed inside the conductive composite material, and therefore, the percolation threshold of the material is greatly reduced, and the material has the maximum peak resistivity and relatively low room temperature resistivity. The preparation method of the conductive composite material is simple to operate, simple and convenient in process, and suitable for popularization and utilization in the related fields.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a preparation method of a conductive composite material. Background technique [0002] With the continuous improvement of living standards, people's pursuit of living materials is becoming more and more strict, and the requirements for many new products are getting higher and higher. To a certain extent, the corresponding production process is forced to be updated. With thermoplastic polymers as the matrix, carbon Black, carbon nanotubes, graphite, ene, and carbon fibers are conductive composite materials prepared as conductive fillers. Because of their soft texture, flexibility, easy processing, low manufacturing costs, and low room temperature resistivity, they can be used in relatively It is widely used as sensors, electromagnetic shielding materials and antistatic materials due to its low temperature and other advantages. Graphene microsheets are closely stacked by seve...

AI Technical Summary

Problems solved by technology

However, graphene microflakes have a two-dimensional layered structure with a large specific surface area, which makes it difficult to disperse uniformly in the polymer matrix, and causes agglomeration due to its large surface force.