Preparation method of graphene

Abstract

The invention belongs to the technical field of graphene production, and particularly relates to a graphene preparation method. The preparation method comprises the following steps: S1, a crushed graphene raw material is mixed with a stripping aid, and then the mixture is stirred at a high speed through a stirring device to form graphene mixed slurry; s2, the mixed slurry prepared in the step S1 is added into a grinding cylinder, wherein a driving shaft drives grinding plates at the grinding cylinder and cavity walls on the two sides to rotate, the rotating direction of the grinding plate being opposite to the rotating direction of a grinding cavity; S3, after the graphene slurry is ground in the step S2 for 11-15 min, an air supply pump can intermittently supply air into a grinding platethrough an elastic air pipe, so that the grinding plate can generate intermittent expansion vibration, and the caked graphene slurry can be extruded and crushed, wherein gas introduced into the expansion cavity in a clearance mode can enable the expansion cavity to generate clearance expansion, expansion of the grinding plate can extrude the inner wall of the grinding cylinder, then graphene slurry agglomerated during grinding can be extruded and crushed, and thereby the efficient grinding and stripping effect of graphene is improved.

Description

technical field [0001] The invention belongs to the technical field of graphene production, in particular to a graphene preparation method. Background technique [0002] Graphene has a perfect two-dimensional crystal structure, and its lattice is a hexagon surrounded by six carbon atoms, with a thickness of one atomic layer. The carbon atoms are connected by σ bonds, and the bonding method is sp2 hybridization. These σ bonds endow graphene with extremely excellent mechanical properties and structural rigidity. Graphene is 100 times stronger than the best steel and even stronger than diamond. In graphene, each carbon atom has an unbonded p-electron. These p-electrons can move freely in the crystal, and the movement speed is as high as 1 / 300 of the speed of light, which endows graphene with good conductivity. [0003] Graphene is a new generation of transparent conductive materials. In the visible light region, the transmittance of four-layer graphene is equivalent to that o...

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Problems solved by technology

[0005] Although the above-mentioned patents can meet the requirements of large-scale production of graphene; when the graphene slurry has a certain viscosity, and then when the rotating roller is rotating and extruded onto the first cylinder, the graphene particles in the slurry are ground Peeling will cause the graphene slurry to form clusters or agglomerates; at the same time, it will cause the graphene slurry to stick to the inner wall of the first cylinder, which will affect the efficient exfoliation preparation of graphene

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