Method of preparing graphene nanoplatelets through air flow stripping classification

Abstract

The invention relates to the field of graphene materials and particularly relates to a preparation method of graphene nanoplatelets, and especially relates to a method of preparing the graphene nanoplatelets through high-speed air flow stripping classification. In the method, molten sodium chloride and magnesium chloride enter layers in graphite, and according to the brittle character of the crystal particles of the sodium chloride and magnesium chloride, the graphite is delaminated in a fluidized bed air flow superfine machine through a high-speed air flow, and further with a cyclone separator as a classification apparatus, the delaminated graphite is separated from large particle materials through the character of high specific surface area, wherein unqualified powder flows back to a pulverization chamber while the delaminated graphite, with the gas together, is subjected to further classification. The graphite is classified through a first-stage cyclone separator and a secondary cyclone separator and then is separated through a third-stage cyclone separator to obtain the graphene nanoplatelets. The method achieves continuously production of the graphene nanoplatelets being uniform in layer number distribution in large scale. The graphene nanoplatelets are uniform in layer number distribution and are high in yield and low in cost. The layer thickness satisfies the demands in the fields of rubber enhancement, plastic enhancement, paint corrosion resistance, lubrication and the like. The invention develops large-scale application of graphene.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a method for preparing graphene sheets, in particular to a method for preparing graphene micro-sheets by airflow stripping and classification. Background technique [0002] Graphene is a new type of material with a two-dimensional honeycomb structure formed by stacking a single layer of carbon atoms. Since 2004, Dr. Novoselov and Professor Geim, two scientists from the University of Manchester in the United Kingdom, successfully separated high-quality graphene that exists alone in the laboratory by using the "tape method" mechanical exfoliation, which opened a research boom for graphene materials. Due to the excellent electrical, mechanical and optical properties of graphene, it has been used in high-end fields for a long time. Graphene is mainly prepared by vapor deposition method, which is prepared by catalytic growth of gaseous carbon source on the surface of the substrate a...

AI Technical Summary

Problems solved by technology

In the thermal expansion process of graphite oxide, a relatively high negative pressure environment is required to achieve the successful expansion of graphite oxide. The conditions are relatively harsh, and the requirements for equipment are extremely high. Continuous production is not possible, and it is difficult to scale up, which restricts the large-scale production of graphene sheets.

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