Method for preparing high-purity graphene

A graphene, high-purity technology, applied in the field of high-purity preparation of graphene, can solve the problems of limited general use, limited commercial application, low yield, etc., and achieves mature process control technology, simple manufacturing process, and huge application prospects. Effect

Active Publication Date: 2015-04-29
郴州博太超细石墨股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the yield is very low, which limits its commercial application; (5) oxidation-reduction method
This method is the simplest and common method to obtain graphene in large quantities. The more commonly used reduction methods are chemical reduction (hydrazine hydrate, ethylenediamine, sodium borohydride, etc. as reducing agents) and rapid thermal reduction,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Grinding and sieving graphite and pimelic acid respectively to obtain graphite powder with an average particle size of 210 μm and pimelic acid powder with an average particle size of 60 μm;

[0022] 2) Weigh the graphite powder and pimelic acid powder according to the weight ratio of 1:1, transfer them to a ball mill tank, add deionized water as a mixed solvent, add grinding balls, and grind, using a double planetary ball mill with a speed of 300rpm, The ball milling time is 10h, and the carboxylated graphene turbid solution is obtained;

[0023] 3) The above-mentioned carboxylated graphene turbid liquid is subjected to ultrasonic oscillation in an ultrasonic device, and the ultrasonic oscillation time is 4h to obtain the carboxylated graphene suspension;

[0024] 4) the mass fraction is that 20% sodium metaaluminate solution is added in the above-mentioned carboxylated graphene suspension, wherein the mass ratio of sodium metaaluminate and carboxylated graphene is 5...

Embodiment 2

[0027] 1) Grinding and sieving graphite and pimelic acid respectively to obtain graphite powder with an average particle size of 300 μm and pimelic acid powder with an average particle size of 100 μm;

[0028] 2) Weigh the graphite powder and pimelic acid powder according to the weight ratio of 1:1.5, transfer them to a ball mill tank, add deionized water as a mixed solvent, add grinding balls, and grind, using a double planetary ball mill with a speed of 500rpm, The ball milling time is 9h, and the carboxylated graphene turbid solution is obtained;

[0029] 3) The above-mentioned carboxylated graphene turbid liquid is subjected to ultrasonic oscillation in an ultrasonic device, and the ultrasonic oscillation time is 2h to obtain the carboxylated graphene suspension;

[0030] 4) the mass fraction is that 25% sodium metaaluminate solution is added in the above-mentioned carboxylated graphene suspension, wherein the mass ratio of sodium metaaluminate and carboxylated graphene is...

Embodiment 3

[0033] 1) Grinding and sieving graphite and pimelic acid respectively to obtain graphite powder with an average particle size of 350 μm and pimelic acid powder with an average particle size of 130 μm;

[0034] 2) Weigh the graphite powder and pimelic acid powder according to the weight ratio of 1:2, transfer them to a ball mill tank, add deionized water as a mixed solvent, add grinding balls, and grind, using a double planetary ball mill with a speed of 600rpm, The ball milling time is 8h, and the carboxylated graphene turbid solution is obtained;

[0035] 3) The above-mentioned carboxylated graphene turbid liquid is subjected to ultrasonic oscillation in an ultrasonic device, and the ultrasonic oscillation time is 2h to obtain the carboxylated graphene suspension;

[0036] 4) the mass fraction is that 30% sodium metaaluminate solution is added in the above-mentioned carboxylated graphene suspension, wherein the mass ratio of sodium metaaluminate and carboxylated graphene is 6...

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Abstract

The invention provides a method for preparing high-purity graphene. The method comprises the following steps: (1) respectively grinding and screening graphite and pimelic acid to obtain graphite powder having an average grain diameter of 210-480mu m and pimelic acid powder having an average grain diameter of 60-200mu m; (2) weighing the graphite powder and the pimelic acid powder in a weight ratio of 1:1-1:4 to prepare a carboxylated graphene turbid solution; (3) putting the carboxylated graphene turbid solution in an ultrasonic device to obtain a carboxylated graphene suspension; (4) adding a meta-aluminate solution into the carboxylated graphene suspension, and stirring to obtain a mixed solution of meta-aluminate and carboxylated graphene; filtering the mixed solution, carrying out microwave heating and activating treatment on the filtered substances, cooling, pickling, washing, filtering and drying to obtain graphene. The method is low in material cost, simple in manufacture process and convenient for large-scale production, and the prepared graphene has a relatively high specific surface area.

Description

technical field [0001] The invention relates to the field of graphene material preparation, in particular to a high-purity preparation method of graphene. Background technique [0002] Graphene was first prepared in 2004 by Andre K. Geim of the University of Manchester, UK, and its unique properties make it widely used in more and more industries. For example, the tensile strength of graphene is as high as 125GPa, the modulus of elasticity reaches 1.1TPa, and the theoretical specific surface area can reach 2630m 2 / g, thermal conductivity at room temperature is about 5000W / mK, etc., which make it have the prospect of application as a thermal conductive material; moreover, single-layer graphene is highly transparent and only absorbs 2.3% of visible light, so it also has applications in the field of optical lighting condition. [0003] So far, there are multiple known methods for preparing graphene, such as: (1) micromechanical exfoliation. This method can only produce a ve...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 林前锋
Owner 郴州博太超细石墨股份有限公司
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