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A method for preparing graphene microsheets using airflow exfoliation classification

A graphene micro-sheet, airflow technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of restricting the large-scale production of graphene sheets, extremely high equipment requirements, and incapable of continuous production, etc., and achieve a significant market. Application value, easy preparation method, low cost effect

Active Publication Date: 2017-10-17
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • A method for preparing graphene microsheets using airflow exfoliation classification
  • A method for preparing graphene microsheets using airflow exfoliation classification

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The method for preparing graphene microsheets by air-flow exfoliation classification:

[0040] (1) Dimethyl sulfoxide, formamide, and polyethylene glycol were prepared as an intercalation agent at a mass ratio of 2:3:1, and then the flake graphite powder was soaked in the intercalation agent for more than 48 hours, and then dried by centrifuge , drying to obtain pre-intercalated graphite;

[0041] (2) Melt sodium chloride and magnesium chloride at a mass ratio of 1:1 in a high-speed mixing reactor at 280-300°C, and add the pre-intercalated graphite obtained in step (1) into the molten chloride under nitrogen protection conditions In the sodium and magnesium chloride melt, stir and disperse at a speed of 300r / min for 35min, the graphite layer is filled with ion melt of sodium chloride and magnesium chloride, then discharge, cool to room temperature under the protection of nitrogen, and pulverize through a 50-mesh sieve. Wherein the mass ratio of pre-intercalation graphi...

Embodiment 2

[0048] Utilize the method for airflow stripping classification to prepare graphene sheet:

[0049] (1) Prepare intercalation agent with dimethyl sulfoxide, formamide, and polyethylene glycol at a mass ratio of 3:3:1, and then soak expanded graphite with a radial size larger than 50 microns in the intercalation agent for more than 48 hours , filtered and dried by a centrifuge to obtain pre-intercalated graphite;

[0050] (2) Melt sodium chloride and magnesium chloride at a mass ratio of 1:1 in a high-speed mixing reactor at 280-300°C, and add the pre-intercalated graphite obtained in step (1) into the molten chloride under nitrogen protection conditions In the sodium and magnesium chloride melt, stir and disperse at a speed of 500r / min for 25min, the graphite layer is filled with ion melt of sodium chloride and magnesium chloride, then discharge, cool to room temperature under the protection of nitrogen, and pulverize through a 50-mesh sieve. Wherein the mass ratio of pre-inte...

Embodiment 3

[0057] Utilize the method for airflow stripping classification to prepare graphene sheet:

[0058] (1) Dimethyl sulfoxide, formamide, and polyethylene glycol are prepared as an intercalation agent at a mass ratio of 3:5:1, and then thermal cracking graphite powder with a radial size greater than 50 microns is soaked in the intercalation agent More than 48h, filter and dry by centrifuge to obtain pre-intercalated graphite;

[0059] (2) Melt sodium chloride and magnesium chloride at a mass ratio of 1:1 in a high-speed mixing reactor at 280-300°C, and add the pre-intercalated graphite obtained in step (1) into the molten chloride under nitrogen protection conditions In the sodium and magnesium chloride melt, stir and disperse at a speed of 800r / min for 35min, the graphite layer is filled with ion melt of sodium chloride and magnesium chloride, then discharge, cool to room temperature under the protection of nitrogen, and pulverize through a 50-mesh sieve. Wherein the mass ratio ...

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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 started the research boom of 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B2204/04C01B2204/32
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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