Method for preparing graphene micro-sheet dispersion on grade by mechanical stripping

A graphene microchip and mechanical exfoliation technology, which is applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of poor uniformity of graphene particle size, low graphene exfoliation efficiency, poor product repetition rate, etc., to achieve Improved stripping efficiency, high product quality, and low cost

Active Publication Date: 2017-03-29
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0009] Aiming at the problems of low exfoliation efficiency, large waste of raw materials, poor uniformity of graphene particle size and poor product repetition rate in the preparation of graphene by mechanical exfoliation method at present, the present invention proposes a method of intercalation expansion first, and then adopts two A kind of mechanical exfoliation method combination carries out the method for graded exfoliation to prepare graphene, to solve the above-mentioned problems that graphene encounters in the mechanical exfoliation production process, concrete technical scheme is as follows:

Method used

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  • Method for preparing graphene micro-sheet dispersion on grade by mechanical stripping

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Effect test

Embodiment 1

[0034] Weigh 100g of graphite and 100g of ammonium persulfate, pour them into 500ml of deionized water, stir at 25-100°C for 3h, then add 200g of weighed sodium carbonate into the graphite mixture, and lower the temperature to 25- 80℃, soak for 5h;

[0035] will step The graphite mixed solution treated in the medium is suction-filtered, and the graphite is rinsed with a small amount of deionized water for 3-5 times, and then the filtered graphite is re-mixed with 500ml of deionized water to prepare a graphite mixed solution;

[0036] will step The pretreated graphite mixed solution in the mixture is poured into a mechanical stirring device, and the rotating speed of the mechanical stirrer is set to 20rpm to carry out preliminary exfoliation of graphite, and mechanically exfoliate at this rotating speed for 0.5h to obtain a larger primary graphene dispersion with a particle size ;

[0037] To step Add polyethylene glycol surfactant 60g in the primary graphene ...

Embodiment 2

[0041] Weigh 100g of graphite and 100g of ammonium persulfate, pour them into 500ml of deionized water, stir at 25-100°C for 3h, then add 200g of weighed sodium carbonate into the graphite mixture, and lower the temperature to 25- 80℃, soak for 5h;

[0042] will step The graphite mixed solution treated in the medium is suction-filtered, and the graphite is rinsed with a small amount of deionized water for 3-5 times, and then the filtered graphite is re-mixed with 500ml of deionized water to prepare a graphite mixed solution;

[0043] will step The pretreated graphite mixed solution in the mixture is poured into a mechanical stirring device, and the rotating speed of the mechanical stirrer is set to 50rpm to carry out preliminary exfoliation of graphite, and mechanically exfoliate at this rotating speed for 0.5h to obtain a larger primary graphene dispersion with a particle size ;

[0044] To step Add polyethylene glycol surfactant 60g in the primary graphene...

Embodiment 3

[0048] Weigh 100g of graphite and 100g of ammonium persulfate, pour them into 500ml of deionized water, stir at 25-100°C for 3h, then add 200g of weighed sodium carbonate into the graphite mixture, and lower the temperature to 25- 80℃, soak for 5h;

[0049] will step The graphite mixed solution treated in the medium is suction-filtered, and the graphite is rinsed with a small amount of deionized water for 3-5 times, and then the filtered graphite is re-mixed with 500ml of deionized water to prepare a graphite mixed solution;

[0050] will step The pretreated graphite mixed solution in the mixture is poured into a mechanical stirring device, and the rotating speed of the mechanical stirrer is set to 50rpm to carry out preliminary exfoliation of graphite, and mechanical exfoliation at this rotating speed for 1.5h, to obtain a primary graphene dispersion with a larger particle size ;

[0051] To step Add polyethylene glycol surfactant 60g in the primary graphen...

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Abstract

The invention discloses a method for preparing graphene micro-sheet dispersion on grade by mechanical stripping; in the method, two different mechanical stripping apparatuses are combined; the method comprises the steps of first, stripping raw graphite and an expanding aid through the effects such as high-speed rotation incurred extrusion, high impact, and weightless expansion to obtain primary finished graphene; mixing the crude product with a dispersant, generating relative motion by high-speed rotation, and generating comprehensive effects in leak slits, such as high-speed shear, friction, centrifugal extrusion, and liquid flow collision to further mix the crude finished graphene and the dispersant so that fine and uniform graphene dispersion is formed. The method can provide improved mechanical stripping efficiency and reduced waste of material, is free of environmental pollution and is suitable for large-scale continuous production.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a method for preparing a graphene microsheet dispersion, and in particular to a method for preparing graphene slurry by using two types of mechanical peeling combined graded peeling. Background technique [0002] In 2004, Andre Geim and Konstantin Novoselov of the University of Manchester in the United Kingdom prepared graphene for the first time, and won the Nobel Prize in Physics in 2010. Since then, graphene has been a research hotspot in the material field. With the continuous deepening of research on graphene materials, it is found that graphene has many excellent properties, such as good electrical conductivity, mechanical properties, optical properties, thermal conductivity and so on. It is precisely because of these unique properties of graphite that it is used in conductive materials, antistatic materials, electromagnetic shielding materials for electronic products, mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/194
Inventor 陈庆曾军堂王镭迪
Owner CHENDU NEW KELI CHEM SCI CO LTD
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