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Method for preparing graphene nanosheets by utilizing friction stripping of same-direction three-roll grinder

A three-roll mill and graphene microchip technology, which is applied in the field of material processing, can solve the problems of low quality graphene and achieve the effects of high uniformity, high product quality and less pollution

Inactive Publication Date: 2017-08-18
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the technical defects of using a three-roll mill to prepare graphene microsheets in the prior art, the quality of the prepared graphene is not high and the requirements for production equipment are relatively high, the present invention uses a three-roll mill that rotates in the same direction for frictional peeling. The method for preparing graphene microsheets uses soluble inorganic salts as the peeling medium to transfer friction, thereby improving the quality of graphene prepared by three-roll mills, which is economical and environmentally friendly, and is conducive to large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh according to the mass ratio of flake graphite and sodium nitrate as 1:2, fully stir until the mixture is uniform, and obtain a graphite mixture for later use;

[0032] (2) Add the graphite mixture into the three-roll mill, run the three-roll mill, control the three rollers of the three-roll mill to rotate in the same direction, and the grinding points of each two rollers rotate in opposite directions, adjust The rotating speed of the three-roll mill is 20r / min, and the running time is 2h. During the rotation process, the flake graphite is exfoliated by transferring friction through sodium nitrate;

[0033] (3) The ground product obtained in step (2) was immersed in distilled water at 45°C, washed 3 times, and then the sodium nitrate was removed. Finally, the product was dried in an electric blast drying oven at 100°C for 10 hours to obtain large graphene micrographs. piece.

[0034] After the performance test of the graphene micro-sheets prepared in the examp...

Embodiment 2

[0036] (1) Weigh according to the mass ratio of expanded graphite and sodium chloride of 1:5, fully stir until the mixture is uniform, and obtain a graphite mixture for later use;

[0037] (2) Add the graphite mixture into the three-roll mill, run the three-roll mill, control the three rollers of the three-roll mill to rotate in the same direction, and the grinding points of each two rollers rotate in opposite directions, adjust The rotating speed of the three-roll mill is 40r / min, and the running time is 1h. During the rotation process, the friction is transmitted through sodium chloride to peel off the expanded graphite;

[0038] (3) Immerse the ground product obtained in step (2) in distilled water at 35°C, wash 4 times, remove sodium chloride, and finally dry the product in an electric blast drying oven at 100°C for 10 hours to obtain large sheets of graphene microchip.

[0039] After the performance test of the graphene micro-sheets prepared in the examples, the obtained...

Embodiment 3

[0041](1) Weigh according to the mass ratio of the mixture of expanded graphite and pyrolysis graphite to potassium sulfate 1:5, fully stir until the mixture is uniform, and obtain a graphite mixture for later use;

[0042] (2) Add the graphite mixture into the three-roll mill, run the three-roll mill, control the three rollers of the three-roll mill to rotate in the same direction, and the grinding points of each two rollers rotate in opposite directions, adjust The rotating speed of the three-roll mill is 100r / min, and the running time is 1h. During the rotation process, the friction is transmitted through potassium sulfate to peel off the expanded graphite and the thermally cracked graphite;

[0043] (3) The ground product obtained in step (2) was immersed in distilled water at 55°C, washed for 5 times, and potassium sulfate was removed. Finally, the product was dried in an electric blast drying oven at 100°C for 10 hours to obtain large graphene micrographs. piece.

[004...

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Abstract

The invention provides a method for preparing graphene nanosheets by utilizing friction stripping of a same-direction three-roll grinder. The method comprises the following steps: preparing a mixed body from graphite and a soluble inorganic salt; adding dried powder into the three-roll grinder, wherein the three rollers of the three-roll grinder rotate in the same direction, grinding points of every two rollers have opposite rotation directions, and friction is transferred through the soluble inorganic salt in the rotation process; stripping the graphite into graphene, cleaning to remove the soluble inorganic salt, thereby obtaining the large graphene nanosheets. According to the method provided by the invention, the technical defects that the yield of the graphene nanosheets prepared by utilizing the three-roll grinder is low and the requirement on production equipment is high are overcome. According to the method provided by the invention, damage of extrusion of the rollers on the graphene size can be effectively avoided, the graphene nanosheets with high uniformity and large radial size can be obtained, the method is simple in preparation process, is green and environmental-friendly and does not need heating, and large-scale industrial production is easily realized.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a method for preparing graphene microflakes by friction stripping with a co-directional three-roller grinder. Background technique [0002] Graphene is a planar carbon nanomaterial composed of a layer of carbon atoms. It is the thinnest two-dimensional material known so far, with a thickness of only 0.335nm. It consists of a hexagonal lattice. The carbon atoms in graphene are connected by σ bonds, which endow graphene with extremely excellent mechanical properties and structural rigidity. Moreover, in graphene, each carbon atom has an unbonded p electron, and these p electrons can move freely in the crystal at a speed of up to 1 / 300 of the speed of light, giving graphene good electrical conductivity. Optically, graphene is almost completely transparent, absorbing only 2.3 percent of light. Graphene has peculiar mechanical, optical and electrical properties, and graphene has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/192
CPCC01B2204/04C01B2204/32
Inventor 陈庆曾军堂王镭迪
Owner CHENDU NEW KELI CHEM SCI CO LTD
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