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Novel technology for preparing expandable graphite by using liquid insert method

A technology of expanded graphite and insertion method, which is applied in the field of material science, can solve problems such as unstable product quality, product quality deviation, and high production cost, and achieve the effects of mild reaction, stable expansion rate, and reduced production cost

Inactive Publication Date: 2014-06-25
温学敏
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the electrolysis method used in the manufacture of expandable graphite has the problems of large power consumption, high production costs, unstable product quality, and large product quality deviations.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0012] The liquid insertion method of the present embodiment prepares the new technology of expandable graphite, comprises the following steps:

[0013] (1) Using graphite as a raw material, mix graphite and a strong oxidant in a container evenly, then add sulfuric acid, stir continuously, and react at a temperature of 50°C for 50 minutes;

[0014] (2) After fully reacting, filter with sulfuric acid solution, wash the obtained graphite water to neutral after precipitation, and dry at 60° C. to obtain expandable graphite.

[0015] The graphite is high flake graphite with a particle size of 50 mesh and a carbon content of 99%; the strong oxidant is ammonium nitrate; and the concentration of concentrated sulfuric acid is 98%.

[0016] The mass ratio of graphite to ammonium nitrate is 10:1, 240ml of concentrated sulfuric acid is needed for every 100g of graphite reaction, and the expansion volume of graphite is 330ml / g.

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PUM

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Abstract

The invention discloses a novel technology for preparing expandable graphite by using a liquid insert method, which takes high crystalline flake graphite as a raw material, the granularity is 50 meshes, the carbon content is 99%, the technology comprises the following steps: uniformly mixing graphite and a strong oxidant ammonium nitrate in a container, adding sulfuric acid and continuously stirring, reacting for 50 minutes under temperature of 50 DEG C, performing pumping filtration and washing the obtained aquadag after deposition to neutrality, and drying under the temperature of 60 DEG C to obtain the expandable graphite. The novel technology for preparing expandable graphite by using the liquid insert method has the advantages of simple operation, mild and stable reaction, can stabilize the puffed rate of the final product, production cost is reduced, no waste liquid is discharged, and no pollution is generated.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a preparation method of expandable graphite. Background technique [0002] Expandable graphite is a widely used inorganic non-metallic material that has appeared in recent years. It has good heat resistance, thermal conductivity, self-lubrication, chemical stability, resilience and flexibility, and is widely used in Chemical industry, machinery, nuclear energy, aerospace, metallurgy, medicine, environmental protection and other industries have huge market prospects. It is irreplaceable by other materials for sealing flame retardant and fire prevention. At present, the electrolysis method used in the manufacture of expandable graphite has the problems of large power consumption, high production cost, unstable product quality, and large product quality deviation. Contents of the invention [0003] In order to overcome the above-mentioned technical problems e...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/225
Inventor 温学敏孙祥林
Owner 温学敏
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