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A method for continuously preparing graphene microsheets by grinding and exfoliating

A graphene microchip and graphene technology, applied in the graphene field, can solve the problems of destroying the graphene structure, no industrial application, affecting performance, etc., and achieve the effect of high product quality, low cost, and improved flexibility

Active Publication Date: 2017-09-05
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of graphene sheets by the redox method will destroy the structure of graphene and affect its performance, and a large amount of chemical reagents are required in the production process, which consumes a lot of energy and pollutes the environment
[0007] In summary, the current preparation methods of graphene microsheets are limited by various factors such as production cost and product performance, and there is still no industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Mix expanded graphite and polyvinyl alcohol at a mass ratio of 3:1 as a carbon material, send it into a screw extruder for extrusion carbonization, feed reducing gas, set the carbonization temperature to 500°C, and make polyvinyl alcohol Carbonization, mixing with expanded graphite to form a graphene precursor;

[0030] (2) Mix the graphene precursor and ethanol aqueous solution in step (1) at a mass ratio of 1:10, stir at room temperature for 15-30 minutes, add tetramethylammonium bicarbonate and continue stirring for 10-20 minutes, so that the graphite The precursor is uniformly dispersed in ethanol aqueous solution;

[0031] (3) Add arginine with a mass ratio of 0.1:1 to the graphite precursor, stir and mix to disperse the crystalline organic matter evenly in the layered structure of the graphite precursor, heat to 40~80°C, and evaporate the solvent to crystallize the organic matter in the form of crystals Precipitate, continue to add ethanol aqueous solution to...

Embodiment 2

[0035] (1) Mix expanded graphite and polyethylene glycol at a mass ratio of 2:1 as a carbon material, send it to a screw extruder for extrusion carbonization, feed a reducing gas, set the carbonization temperature to 300°C, and make organic polymerization carbonization, mixed with expanded graphite to form a graphene precursor;

[0036] (2) Mix the graphene precursor and ethanol aqueous solution in step (1) at a mass ratio of 1:8, stir at room temperature for 15-30 minutes, add dodecyl tetramethylguanidine carbonate and continue stirring for 10-20 minutes , so that the graphite precursor is uniformly dispersed in the aqueous ethanol solution;

[0037] (3) Add theanine with a mass ratio of 0.15:1 to the graphite precursor, stir and mix to disperse the crystalline organic matter evenly in the layered structure of the graphite precursor, heat to 40~80°C, and evaporate the solvent to crystallize the organic matter in the form of crystals Precipitate, continue to add ethanol aqueo...

Embodiment 3

[0041] (1) Mix expanded graphite and polylactic acid at a mass ratio of 2:1 as a carbon material, send it to a screw extruder for extrusion carbonization, pass in reducing gas, set the carbonization temperature to 500°C, and carbonize the organic polymer , mixed with expanded graphite to form a graphene precursor;

[0042] (2) Mix the graphene precursor and ethanol aqueous solution in step (1) at a mass ratio of 1:5, stir at room temperature for 15~30min, add cetyltrimethylammonium bromide and continue stirring for 10~ 20min, the graphite precursor is uniformly dispersed in the aqueous ethanol solution;

[0043] (3) Add glutamine with a mass ratio of 0.12:1 to the graphite precursor, stir and mix to disperse the crystalline organic matter evenly in the layered structure of the graphite precursor, heat to 40~80°C, and evaporate the solvent to crystallize the organic matter in the form of crystals Precipitate, continue to add ethanol aqueous solution to re-dissolve the crystall...

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Abstract

The invention belongs to the technical field of graphene, and particularly relates to a method for continuously preparing graphene nanoplatelets by means of grinding stripping.The method comprises the steps that crystallized organic matter is uniformly dispersed in a graphite precursor through solvent dispersion, deformation force produced through repeated crystallization of the crystallized organic matter is utilized for enabling the graphite layer frame distance to be increased, and intercalated graphite is formed; the intercalated graphite is sent to a grinding stripping machine, the stripping and grinding effect of shear force formed in the mutual friction process of media and the graphite material is utilized, the intercalated graphite is stripped, and graphene nanoplatelets are formed; screening separation is conducted on stripped graphite through a vibrating screening machine, unstripped graphite is screened out to be stripped again, and the uniformly distributed graphene nanoplatelets are obtained.The number of layers of the prepared graphene nanoplatelets ranges from 10 to 100, the crystal structure is complete, the high-quality graphene nanoplatelets are produced in an efficient, low-cost and continuous mode under a high shear condition, the preparation process is green and environmentally friendly, and a significant market value is achieved.

Description

technical field [0001] The invention belongs to the technical field of graphene, and relates to a method for preparing graphene by mechanical exfoliation, in particular to a method for continuously preparing graphene microsheets by grinding and exfoliating. Background technique [0002] Graphene is a single-layer carbon atom surface material exfoliated from graphite material. It is a two-dimensional material with a honeycomb hexagonal planar structure formed by sp2 hybridization of carbon atoms. Since the discovery of graphene by two scientists from the University of Manchester in 2004 using "tape" mechanical stripping, it has become the focus of attention of the scientific and industrial circles. Graphene is currently the thinnest and hardest nanomaterial. It has good electrical and optical properties, mechanical properties, thermal conductivity and high charge carrier mobility, as well as strong mechanical strength and flexibility. The performance that ordinary materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B2204/04
Inventor 陈庆孙丽枝
Owner CHENDU NEW KELI CHEM SCI CO LTD
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