Method for directly growing graphene on carbon black

Abstract

The invention discloses a method for directly growing graphene on carbon black. The method comprises the following steps: taking finished carbon black as a raw material, taking high-temperature melt as a solvent and a carrier, and taking an organic carbon source as a precursor of the graphene; conveying the carbon black into the bottom of a flat-bottomed container which is filled with the high-temperature melt for accumulating and spreading, wherein the carbon black floats in the melt because of low apparent density; simultaneously, adding the organic carbon source into the high-temperature melt; splitting the organic carbon source into atomic carbon in virtue of the high temperature of the melt; dissolving the atomic carbon into the high-temperature melt solvent; continuously adding the organic carbon source so that the atomic carbon reaches a supersaturation condition in the high-temperature melt, wherein the graphite crystallite in a carbon black structure is beneficial to the growth of the graphene, and the graphene is supersaturated and separated out on the floating carbon black to realize direct growth. The graphene-modified carbon black prepared by the method is excellent inperformance and quality, low in cost, high in efficiency and low in pollution.

Description

technical field [0001] The invention relates to the field of new material preparation, in particular to a method for directly growing graphene on carbon black. Background technique [0002] Carbon black (carbon black), also known as carbon black, is an amorphous carbon. Light, loose and very fine black powder with a very large surface area ranging from 10 to 3000m 2 / g, is the product obtained by incomplete combustion or thermal decomposition of carbonaceous substances (coal, natural gas, heavy oil, fuel oil, etc.) under the condition of insufficient air. Specific gravity 1.8-2.1. According to the performance of carbon black, there are "reinforcing carbon black", "wear-resistant carbon black", "conductive carbon black" and so on. Currently it is mainly used in mechanical reinforcement, conductive additives and black pigments and dyes. Especially in the application of rubber tires, on the one hand, it can reduce the weight of rubber and reduce the cost of rubber use; on t...

AI Technical Summary

Problems solved by technology

[0006] 2. The production cost of graphene is extremely high

This method can form high-quality graphene on substrates (such as copper substrates), but it has strict requirements on equipment and production conditions, long reaction time, low yield, and high cost

In particular, graphene grown on substrates (such as copper, nickel, silicon carbide, etc.) by this method is difficult to transfer from the substrate; extreme methods such as strong acid corrosion and high-temperature gasification are often required for transfer, which is Caused high cost, high environmental pollution, and will damage graphene finished products

[0007] 3. Due to the extremely high cost of graphene, the cost of graphene-enhanced carbon black obtained by simply mixing carbon black with graphene or graphene oxide mechanically is also very high

And because the dispersibility of graphene is very poor, the effect of adding the graphene-enhanced carbon black obtained by the above method to the material (such as rubber, plastic, etc.) that needs to be modified and then mixed is not ideal.