Method for preparing graphene micro-sheets by using counter-jet jet mill

A technology of graphene microchips and jet mills, which is applied in the field of graphene materials, can solve the problems of small output, complicated preparation process, and high production cost of graphene, and achieve the effects of reduced production costs, uniform dispersion, and good fluidity

Active Publication Date: 2016-05-04
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of high production cost of graphene, complex preparation process and small output, the present invention proposes a low-cost method for preparing graphene microchips

Method used

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  • Method for preparing graphene micro-sheets by using counter-jet jet mill
  • Method for preparing graphene micro-sheets by using counter-jet jet mill

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of method that utilizes counter-jet jet mill to prepare graphene microsheets:

[0031] (1) Mix 80 parts by weight of expanded graphite powder, 1 part by weight of talc powder, and 0.5 parts by weight of dimethylacetamide in a high-speed mixing reactor at a heating temperature of 250 ° C, at 300 rpm Stir and disperse for 30-60 minutes at a certain speed to obtain a mixed powder;

[0032] (2) Prepare the intercalation agent with ferric chloride, potassium chloride, and polyethylene glycol at a mass ratio of 2:2:1, and then soak the mixed powder obtained in step (1) in the intercalation agent for more than 48 hours, Filter and dry by centrifuge to obtain pre-intercalation powder;

[0033] (3) Feed the pre-intercalation powder obtained in step (2) into the jet-jet pulverizer, which is equipped with two nozzles, one pulverization nozzle sprays into the pulverization chamber at a pressure of 3.0 MPa, and one The feeding nozzle is sprayed into the crushing chamber wit...

Embodiment 2

[0035] A kind of method that utilizes counter-jet jet mill to prepare graphene microsheets:

[0036] (1) Mix 90 parts by weight of highly oriented graphite powder, 5 parts by weight of talc powder and 1.5 parts by weight of dimethylacetamide in a high-speed mixing reactor at a heating temperature of 300 ° C, to Stir and disperse at a speed of 600rpm for 30min to obtain a mixed powder;

[0037] (2) Prepare the intercalation agent with ferric chloride, potassium chloride, and polyethylene glycol at a mass ratio of 3:3:1, and then soak the mixed powder obtained in step (1) in the intercalation agent for more than 48 hours, Filter and dry by centrifuge to obtain pre-intercalation powder;

[0038] (3) Feed the pre-intercalation powder obtained in step (2) into the jet-jet pulverizer, which is equipped with two nozzles, one pulverization nozzle sprays into the pulverization chamber at a pressure of 4.0 MPa, and one The feeding nozzle is sprayed into the crushing chamber with a pre...

Embodiment 3

[0040] A kind of method that utilizes counter-jet jet mill to prepare graphene microsheets:

[0041] (1) Mix 85 parts by weight of flake graphite powder, 3 parts by weight of talc powder and 0.8 parts by weight of dimethylacetamide in a high-speed mixing reactor at a heating temperature of 260°C, and mix at 400rpm Stir and disperse at a rotating speed of 45min to obtain a mixed powder;

[0042] (2) Prepare the intercalation agent with ferric chloride, potassium chloride, and polyethylene glycol at a mass ratio of 2.1:2.5:1, and then soak the mixed powder obtained in step (1) in the intercalation agent for more than 48 hours, Filter and dry by centrifuge to obtain pre-intercalation powder;

[0043] (3) Send the pre-intercalation powder obtained in step (2) into the jet mill of the jet jet, which is equipped with two nozzles, one of which sprays into the pulverization chamber at a pressure of 3.6 MPa, and one of the jet jet mills. The feeding nozzle is sprayed into the crushin...

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Abstract

The invention relates to the field of graphene materials, particularly relates to preparation methods for graphene micro-sheets and particularly relates to a method for preparing the graphene micro-sheets by using a counter-jet jet mill. According to the method, the graphene sheets are obtained through enabling melted ferric chloride and potassium chloride to enter an interlayer of graphite, enabling the powder materials to be in collision through high-speed airflow in the counter-jet jet mill by using the characteristic of brittleness of ferric chloride and potassium chloride crystal grains and the characteristics of good fluidity and difficulty in agglomeration of talcum powder, delaminating the graphite and the talcum powder by generated impact force, shearing force and frictional force, carrying out further separation by a grading room, refluxing unqualified powder material to a crushing chamber, and yielding delaminated graphite and talcum powder as well as gas together. The continuous and large-scale production of the graphene micro-sheets, which are uniform in layer number dispersion and good in fluidity and are not prone to agglomeration, is achieved, the yield is high, the cost is low, no pollution is caused, and the layer thickness meets the requirements of use in the fields of rubber reinforcing, plastic reinforcing, coating material anticorrosion, lubrication and sewage treatment, so that the promotion of the large-scale application of graphene is facilitated.

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 using a counter-jet jet mill. Background technique [0002] Graphene is another new type of carbon nanomaterial discovered after carbon nanotubes. Its appearance makes the crystal structure of carbon form a complete system including fullerenes, carbon nanotubes, graphene, graphite and diamond. From zero to three-dimensional carbon paradigm. Due to the excellent electrical, mechanical, and optical properties of graphene, the preparation process of graphene has always attracted much attention. At present, the main process for preparing graphene is to adopt the vapor phase deposition method, which uses a gaseous carbon source to decompose at high temperature and deposit on the surface of the substrate. Graphene is prepared by catalytic growth on the surface, which is an important ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 陈庆叶任海
Owner CHENDU NEW KELI CHEM SCI CO LTD
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