▎ 摘　　要

NOVELTY - Preparing graphene by ball milling using hyperbranched polyethylene as auxiliary agent, comprises e.g. (i) mixing a certain amount of natural graphite and hyperbranched polyethylene in a certain organic solvent, thoroughly mixing and removing the solvent to form a first mixture, (ii) mixing and stirring the first mixture with high-density polyethylene, adding into a ball milling tank to form a second mixture, performing ball milling treatment with the aid of hyperbranched polyethylene, natural graphite is exfoliated into oligo-layer graphene and adhered to the surface of high-density polyethylene to obtain ball milled products, and the high-density polyethylene is granular high-density polyethylene with a porous surface, and (iii) dispersing the ball milled product in an organic solvent, and removing the high-density polyethylene from the ball milled product to obtain a graphene dispersion, where the mass ratio of natural graphite and hyperbranched polyethylene is 1-20:1. USE - The method is useful for preparing graphene by ball milling using hyperbranched polyethylene as auxiliary agent. ADVANTAGE - The method: is simple, easy to operate, economical, mild in preparation conditions, environmentally friendly; and efficiently and continuously produces graphene in large quantities. DETAILED DESCRIPTION - Preparing graphene by ball milling using hyperbranched polyethylene as auxiliary agent, comprises (i) mixing a certain amount of natural graphite and hyperbranched polyethylene in a certain organic solvent, thoroughly mixing and removing the solvent to form a first mixture, (ii) mixing and stirring the first mixture with high-density polyethylene, adding into a ball milling tank to form a second mixture, performing ball milling treatment in the process of ball milling, with the aid of hyperbranched polyethylene, natural graphite is exfoliated into oligo-layer graphene and adhered to the surface of high-density polyethylene to obtain ball milled products, and the high-density polyethylene is granular high-density polyethylene with a porous surface, and (iii) dispersing the ball milled product in an organic solvent, and removing the high-density polyethylene from the ball milled product to obtain a graphene dispersion, based on the total mass of natural graphite, hyperbranched polyethylene and high-density polyethylene as 100 wt.%, the mass percentage of high-density polyethylene is 1-90 wt.%, and the mass ratio of natural graphite and hyperbranched polyethylene is 1-20:1.