Preparation method of expandable graphite

A technology of expanded graphite and flake graphite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of large consumption of concentrated sulfuric acid, high cost, large water consumption, etc., and achieve significant commercial value and expansion ratio High, cost-saving effect

Inactive Publication Date: 2013-06-12
乌兰察布市大盛石墨新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problems of the traditional chemical method are: high reaction temperature, difficult control, inconvenient operation; large amount of concentrated sulfuric acid, high cost; large amount of water in the subsequent washing process, although the electrochemical method avoids the use of strong acid and strong oxidant, but Limited by equipment and process conditions, it is difficult to achieve large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of expandable graphite preparation method described in the embodiment of the present invention, its raw material is +80 mesh natural flake graphite produced by Xinghe, the fixed carbon content is 99.9%, the intercalation agent is 98% concentrated sulfuric acid, the oxidant is 35% hydrogen peroxide, and the flake The mass ratio of graphite, concentrated sulfuric acid and hydrogen peroxide is 1:1.2:0.08.

[0019] Described expandable graphite preparation method comprises the following steps:

[0020] In the first step, hydrogen peroxide is slowly added to concentrated sulfuric acid through a special device, while the reaction system is cooled by circulating water, and the speed of adding hydrogen peroxide is controlled so that the system temperature is not higher than 40°C;

[0021] In the second step, immediately after the addition of hydrogen peroxide, transfer the mixture of hydrogen peroxide and concentrated sulfuric acid to the mixer, add graphite flakes, star...

Embodiment 2

[0025] A kind of expandable graphite preparation method described in the embodiment of the present invention, its raw material is +50 mesh natural flake graphite produced by Xinghe, the fixed carbon content is 99.9%, the intercalation agent is 98% concentrated sulfuric acid, the oxidant is 35% hydrogen peroxide, and the scale The mass ratio of graphite, concentrated sulfuric acid and hydrogen peroxide is 1:1.2:0.08.

[0026] Described expandable graphite preparation method, comprises the following steps:

[0027] In the first step, hydrogen peroxide is slowly added to concentrated sulfuric acid through a special device, and the reaction system is cooled by circulating water. Control the addition rate of hydrogen peroxide so that the system temperature is not higher than 40°C;

[0028] In the second step, immediately after adding the hydrogen peroxide, transfer the mixture of hydrogen peroxide and concentrated sulfuric acid to the mixer, add flake graphite, start stirring and ...

Embodiment 3

[0032] A kind of expandable graphite preparation method described in the embodiment of the present invention, its raw material is +100 mesh natural flake graphite produced by Xinghe, the fixed carbon content is 95%, the intercalation agent is 92.5% concentrated sulfuric acid, the oxidizing agent is 25% hydrogen peroxide, and the scale The mass ratio of graphite, concentrated sulfuric acid and hydrogen peroxide is 1:1.4:0.10.

[0033] Described expandable graphite preparation method, comprises the following steps:

[0034] In the first step, hydrogen peroxide is slowly added to concentrated sulfuric acid through a special device, and the reaction system is cooled by circulating water. Control the addition rate of hydrogen peroxide so that the system temperature is not higher than 40°C;

[0035] In the second step, immediately after adding the hydrogen peroxide, transfer the mixture of hydrogen peroxide and concentrated sulfuric acid to the mixer, add graphite flakes, start the...

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Abstract

The invention relates to a preparation method of expandable graphite. The preparation method comprises the following steps of: 1, adding an oxidizing agent to an intercalation agent to form an oxidized intercalation system, and cooling a reaction system through circulating water to control the temperature to be not more than 40 DEG C; 2, transferring a mixed solution of the oxidizing agent and the intercalation agent into a mixing machine, then adding crystalline flake graphite, starting the stirring device, electrifying a water cooling device at the same time, stirring for 30 minutes, shutting down, standing for 30 minutes, and then leading out materials; 3, washing the led materials till the pH value is 6-7; and 4, carrying out drying treatment on the washed neutral materials under the condition that the drying temperature is not more than 120 DEG C to finally obtain an expandable graphite finished product. According to the invention, a small usage amount of the intercalation agent is about 40%-50% of the usage amount of the intercalation agent in the traditional method; and the prepared expandable graphite has the advantages of high expansion magnification, no dead segment, cost saving and outstanding commercial value.

Description

technical field [0001] The invention relates to the technical field of graphite preparation, in particular to a preparation method of expandable graphite. Background technique [0002] Expandable graphite was first discovered by the German Shafautl in 1841. Because the material exhibited good sealing performance after high temperature expansion, the United States Union Carbide Corporation applied for a related patent in 1963 and started large-scale development 4 years later. large-scale industrial production. In the past ten years, the application fields of expandable graphite and expanded graphite have been greatly expanded. Expanded graphite not only has the excellent properties of natural graphite itself, such as heat resistance, corrosion resistance, and self-lubrication, but also has properties such as lightness, softness, compressibility, and resilience that natural graphite does not have. All kinds of belts, plates and sheets have been widely used as various dynamic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/225
Inventor 王恩平苗伟时迎迎
Owner 乌兰察布市大盛石墨新材料股份有限公司
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