Graphene stripping kettle, graphene production system and graphene production method

Abstract

The invention discloses a graphene stripping kettle. The graphene stripping kettle comprises a kettle body of which the periphery is provided with a heating jacket, wherein the kettle body is provided with a pressure gauge used for detecting the pressure in the kettle and a temperature measuring device used for detecting the temperature in the kettle; a feed opening is formed in the top of the kettle body, and a discharge opening is formed in the middle lower part of the kettle body; a rotating shaft is arranged in the kettle body, is connected with a stirring paddle, and is connected with a drive motor which is arranged on the outer top of the kettle body; fixed cutting blades used for stripping graphite flakes are closely distributed on the inner wall surface of the kettle body, and cutting edges of the fixed cutting blades go inward beyond the inner wall surface of the kettle body; and a groove is formed between adjacent fixed cutting blades. According to the graphene stripping kettle, the fixed cutting blades are arranged on the inner wall surface of the kettle body, and can be used for successfully stripping graphene under a condition of no grinding balls or direct pressure application. The invention further relates to a graphene production system containing the graphene stripping kettle and a graphene production method by using the production system.

Description

technical field [0001] The invention relates to the technical field of graphene production, in particular to an exfoliation kettle and a graphene production system for exfoliating graphite into graphene, and also to a graphene production method. Background technique [0002] Graphene is a sheet-like two-dimensional material in which carbon atoms are represented by sp 2 The hybrid orbitals form a hexagonal honeycomb lattice structure. This special two-dimensional structure causes graphene to exhibit various special properties, such as high strength, high hardness, high thermal conductivity and electrical conductivity; due to these structural characteristics and performance characteristics, graphene is known as the layer, transparent bendable electronic components, ultra-large capacitors, etc. What needs to be added is that, strictly speaking, graphene is a single-layer sheet; however, due to the difficulty of preparing single-layer graphene, oligolayer graphene with similar...

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Problems solved by technology

[0005] Among them, conventional grinding refers to grinding graphite in a mortar grinder. The disadvantages are: first, the shear force comes from the friction force caused by pressure, and the excessive pressure makes it difficult for the motor to drive the pestle body to rotate, which limits the shear force. If the pressure is too small, it is difficult to shear and peel off; secondly, the shearing efficiency is low, and increasing the amount of pressed powder will lead to insufficient shearing force of some powders; thirdly, the uneven pressure exerted by the pestle on the graphite is prone to overgrinding, and the Applying pressure to graphite will cause structural defects in graphene, and even shatter graphene after exfoliation, so that the obtained product has more "burrs" on the edges and small crystal size

Among them, increasing the interlayer spacing by oxidation-reduction method will introduce defects into the graphene structure and affect the conductivity and other properties. Although the introduced groups can be removed by reduction, the process is complicated, which is not conducive to industrial production, and it is impossible to achieve 100% of the graphene structure. Reduction, and the treatment liquid used will pollute the environment; and the impact force generated by supercritical and ultrasonic waves not only provides the driving force for the delamination of graphite, but also causes graphene to explode due to the non-directional nature of the impact force. thereby reducing its size

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