Preparation method of expanded 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 difficult to achieve continuous production of graphite, long production cycle of expanded graphite, etc., and achieve short production cycle, intercalation and other problems. Efficient, simple step effect

Active Publication Date: 2017-05-31
北京鼎臣石墨科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, what the present invention is to solve is the problem that the existing expanded graphite production cycle is long and it is difficult to realize the continuous production of graphite

Method used

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  • Preparation method of expanded graphite
  • Preparation method of expanded graphite

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Embodiment 1

[0038] The present embodiment provides a kind of preparation method of expanded graphite, comprises the steps:

[0039] S1, configure the first mixed solution, including potassium permanganate, perchloric acid and phosphoric acid;

[0040] S2. Add the first mixed solution into the graphite flakes, and stir at 100 r / min for 3 minutes at 30° C., then stir at 300 r / min for 20 minutes to obtain the first mixed system;

[0041] The ratio of the flake graphite, the potassium permanganate, the perchloric acid and the phosphoric acid is 3g:1g:4mL:1mL, and the flake graphite is 30 mesh.

[0042] The first mixing system was subjected to the first step of ultrasonic vibration for 8 minutes, and the ultrasonic power was 600w.

[0043] S3. Configure a second mixed solution, including sodium chlorate, perchloric acid and nitric acid; the ratio of the sodium chlorate, the perchloric acid and the nitric acid is 1g: 3mL: 1mL;

[0044] S4. Add the second mixed solution into the first mixed syst...

Embodiment 2

[0052] The present embodiment provides a kind of preparation method of expanded graphite, comprises the steps:

[0053] S1, configure the first mixed solution, including potassium permanganate, perchloric acid and phosphoric acid;

[0054] S2. Add the first mixed solution into the flake graphite, and stir at 120r / min for 0.5min at 20°C, then stir at 350r / min for 10min to obtain the first mixed system;

[0055] The ratio of the flake graphite, the potassium permanganate, the perchloric acid and the phosphoric acid is 2g:2g:6mL:0.1mL, and the flake graphite is 20 mesh.

[0056] The first mixing system was subjected to the step of ultrasonic vibration for 5 minutes for the first time, and the ultrasonic power was 800w.

[0057] S3. Configure a second mixed solution, including sodium chlorate, perchloric acid and nitric acid; the ratio of the sodium chlorate, the perchloric acid and the nitric acid is 2g: 1mL: 2mL;

[0058] S4. Add the second mixed solution into the first mixed ...

Embodiment 3

[0064] The present embodiment provides a kind of preparation method of expanded graphite, comprises the steps:

[0065] S1, configure the first mixed solution, including potassium permanganate, perchloric acid and phosphoric acid;

[0066] S2. Add the first mixed solution into the graphite flakes, and stir at 80 r / min for 5 min at 45°C, then stir at 280 r / min for 30 min to obtain the first mixed system;

[0067] The ratio of the flake graphite, the potassium permanganate, the perchloric acid and the phosphoric acid is 4g:0.1g:1mL:2mL, and the flake graphite is 35 mesh.

[0068] The first mixing system was subjected to the first step of ultrasonic vibration for 10 minutes, and the ultrasonic power was 500w.

[0069] S3. Configure a second mixed solution, including sodium chlorate, perchloric acid and nitric acid; the ratio of the sodium chlorate, the perchloric acid and the nitric acid is 0.1g: 6mL: 0.1mL;

[0070] S4. Add the second mixed solution into the first mixed system...

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Abstract

The invention relates to the field of new materials. A preparation method of expanded graphite comprises the steps of preparing a first mixed solution which comprises potassium permanganate, perchloric acid and phosphoric acid; adding the first mixed solution to crystalline flake graphite and carrying out stirring reaction at 20-45 DEG C for 15-35min to obtain a first mixed system; preparing a second mixed solution which comprises sodium chlorate, perchloric acid and nitric acid; adding the second mixed solution to the first mixed system and carrying out stirring reaction at 20-45 DEG C for 5-15min to obtain a second mixed system; filtering the second mixed system, taking a solid, and washing the solid until washing liquid is neutral to obtain a head product; and burning the expanded graphite in an environment of 850-1,000 DEG C until the volume does not change any more to obtain the expanded graphite. According to the preparation method of the expanded graphite, graphite oxidation is more thorough and higher in intercalating efficiency; the expansion rate of the prepared expanded graphite can reach 500-700ml / g; and the step is simple, the continuous reaction can be achieved, the production cycle is short and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a preparation method of expanded graphite. Background technique [0002] Expanded graphite, as an intermediate product in the manufacture of flexible graphite, is a loose and porous worm-like substance obtained from natural flake graphite through oxidation, acidification intercalation, water washing, drying, and high-temperature treatment, also known as graphite worm. [0003] Expanded graphite not only has the excellent properties of natural graphite itself such as heat resistance, corrosion resistance, electrical conductivity, thermal conductivity, and self-lubrication, but also has properties such as light weight, softness, compressibility, and resilience that natural graphite does not have. Therefore, in sealing In the field, expanded graphite materials have better performance and uses than asbestos, rubber and other materials. [0004] Various strips, plates and sheets made of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225
CPCC01P2004/03
Inventor 王三胜
Owner 北京鼎臣石墨科技有限公司
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