Dry type stripping production process of graphene nano powder

Abstract

The invention relates to the technical field of graphene production methods, in particular to a dry type stripping production process of graphene nano powder. The dry type stripping production processincludes the steps of firstly, heating to expand expandable graphite with high expansion times under inert or reduction atmosphere to obtain graphite worms; secondly, subjecting the collected graphite worms to ultrahigh-speed rotary shearing in a crushing cavity to obtain graphite micro-sheets; thirdly, processing the graphite micro-sheets in a high-pressure container on a vibration platform; fourthly, subjecting the graphite micro-sheets flowing out of the high-pressure container to continuous stripping in an ultrasonic stripping cavity to obtain the graphene nano powder. The obtained graphene nano powder is large in single-layer sheet diameter, few in layers, good in universality, high in conductivity, low in resistance, high in specific surface area and low in production cost.

Description

technical field [0001] The invention relates to the technical field of production methods of graphene, in particular to a dry stripping production process of graphene nanopowder. Background technique [0002] Graphene is a two-dimensional material composed of a single layer of carbon atoms. Since its discovery in 2004, it has continuously demonstrated its excellent properties to the world. Graphene is favored because of its excellent light transmittance, huge thermal conductivity, and extremely low resistivity, and is known as the next-generation material that triggers the industrial revolution. At present, the main methods for preparing graphene are: mechanical exfoliation method, solvent exfoliation method, chemical vapor deposition method, crystal epitaxial growth method, redox method and so on. Among them, the first two stripping methods have low production efficiency; the chemical vapor deposition method and the crystal epitaxial growth method are high in cost, complic...

AI Technical Summary

Problems solved by technology

Among them, the first two stripping methods have low production efficiency; the chemical vapor deposition method and the crystal epitaxial growth method are high in cost, complicated in operation and unable to produce large-area graphene; and although the redox method is low in cost and simple in process, the prepared graphene Large structural defects and high impurity content

Because the above methods all have cost problems, the fundamental reason hindering the large-scale application of graphene is cost. Under the premise of high cost, the application of graphene can only be high-end, and the huge demand is rejected due to price reasons. In addition, such as anti-corrosion coatings, rubber, plastics, magnesia-carbon bricks of heat-resistant materials, etc., each of which has an annual demand of more than 10,000 tons, or even 100,000 tons, and its price affordability is low, and multi-layer graphene can meet These demands, therefore, make it imperative to develop a new, ultra-low-cost graphene production process