Graphene paste material and preparation method thereof

Abstract

The invention provides a graphene paste material, and belongs to the field of graphene preparation. Through the collection and enrichment effect of a chelating agent, through two-stage grinding under a liquid grinding condition, particles reaching the graphene level float on the liquid surface through the chelating agent and are continuously guided out and collected through a diversion groove, so the graphene level can not be reached; the chelating agent can not be chelated and collected, so the chelating agent continues to circulate for grinding in a grinding device. By means of a method, particles reaching the graphene level are collected in time, yield is high, graphene is effectively prevented from being excessively ground and damaged, and collected graphene is uniform and stable in quality. Graphene is in a chelating state, is stable in dispersion and free of sedimentation and coagulation in paste and is graphene paste which can be directly added. The material is applied to a battery conductive agent, conductive coating, anticorrosion coating and thermal conductive coating. The green, clean and large-scale production, application and development of the graphene industry are further promoted.

Description

technical field [0001] The invention relates to the field of graphene material preparation, in particular to the preparation of graphene material through liquid continuous grinding and exfoliation, and further relates to the obtained graphene slurry material. Background technique [0002] In 2004, two scientists from the University of Manchester in the United Kingdom discovered graphene using the method of micromechanical exfoliation, and won the Nobel Prize in Physics in 2010. As a new material, graphene is currently widely studied. Graphene in an ideal state is a flat plate structure with a single atom thickness and sp2 bonded carbon atoms. However, due to its nano-microscopic characteristics, the preparation, storage, and use of graphene need to be solved in depth. [0003] At present, the most mature method is to prepare graphene by redox method. Using strong oxidants such as concentrated sulfuric acid, concentrated nitric acid, and potassium permanganate to oxidize g...

AI Technical Summary

Problems solved by technology

However, the existing wet grinding and stirring is to grind the next batch of materials after one batch of materials is ground, that is, intermittent grinding, which cannot carry out continuous production, the number of product layers varies greatly, and the energy consumption of the process is high.

Moreover, the yield of graphene is low and the quality is unstable

[0006] Since graphene is in a state of coexistence of various sizes of particles during the exfoliation process, graphene is at the nanometer level, and its size effect determines that it is easy to agglomerate, and the particles that do not reach the size of graphene need to continue to be exfoliated, which usually results in a lower yield of liquid phase exfoliation. Low

Although the dispersion can keep the graphene from agglomerating well, the graphene dispersion is easy to coagulate and settle during long-term storage, which causes certain restrictions on use, and it needs to be stirred again to disperse, which greatly reduces the performance of graphene.

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