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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 complete graphite oxidation and production cycle. Short, easy-to-follow effects

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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Embodiment 1

[0035] The present embodiment provides a kind of preparation method of expanded graphite, comprises the steps:

[0036] S1. Configure the first mixed solution, including sodium chlorate, perchloric acid and phosphoric acid; the ratio of the sodium chlorate, the perchloric acid and the phosphoric acid is 1g: 4mL: 1mL;

[0037] S2. Add the first mixed solution into the graphite flakes, and stir at 100 r / min for 3 minutes at 30° C., and then stir at 300 r / min for 20 minutes to obtain the first mixed system.

[0038] As an embodiment of the present invention, in this embodiment, the ratio of the flake graphite to the first mixed solution is 3g:4mL; the flake graphite is 30 mesh.

[0039] The first mixing system was subjected to ultrasonic vibration for the first time for 8 minutes, and the ultrasonic power was 600w.

[0040] S3. Prepare a second mixed solution, including potassium permanganate and perchloric acid; the ratio of the potassium permanganate and the perchloric acid is...

Embodiment 2

[0049] The present embodiment provides a kind of preparation method of expanded graphite, comprises the steps:

[0050] S1. Configure the first mixed solution, including sodium chlorate, perchloric acid and phosphoric acid; the ratio of the sodium chlorate, the perchloric acid and the phosphoric acid is 2g: 6mL: 0.1mL;

[0051] S2. Add the first mixed solution into the graphite flakes, and stir at 80 r / min for 5 min at 20° C., and then stir at 350 r / min for 10 min to obtain the first mixed system.

[0052] As an embodiment of the present invention, in this embodiment, the ratio of the flake graphite to the first mixed solution is 2 g: 1 mL; the flake graphite is 20 mesh.

[0053] The first mixing system was subjected to ultrasonic vibration for the first time for 5 minutes, and the ultrasonic power was 800w.

[0054] S3. Prepare a second mixed solution, including potassium permanganate and perchloric acid; the ratio of the potassium permanganate and the perchloric acid is 0.1...

Embodiment 3

[0062] The present embodiment provides a kind of preparation method of expanded graphite, comprises the steps:

[0063] S1. Configure the first mixed solution, including sodium chlorate, perchloric acid and phosphoric acid; the ratio of the sodium chlorate, the perchloric acid and the phosphoric acid is 0.1g: 1mL: 2mL;

[0064] S2. Add the first mixed solution into the graphite flakes, and stir at 120 r / min for 1 min at 45° C., and then stir at 280 r / min for 30 min to obtain the first mixed system.

[0065] As an embodiment of the present invention, in this embodiment, the ratio of the flake graphite to the first mixed solution is 1 g:2mL; the flake graphite is 35 mesh.

[0066] The first mixing system was subjected to ultrasonic vibration for the first time for 10 minutes, and the ultrasonic power was 500w.

[0067] S3. Prepare a second mixed solution, including potassium permanganate and perchloric acid; the ratio of the potassium permanganate and the perchloric acid is 2g:...

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Abstract

The invention relates to the field of new materials and discloses a preparation method of expanded graphite. The method comprises the following steps of preparing a first mixed solution which is prepared from sodium chlorate, 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 15-35 minutes to obtain a first mixed system; preparing a second mixed solution which is prepared from potassium permanganate and perchloric acid; adding the second mixed solution to the first mixed system and carrying out stirring reaction at 20-45 DEG C for 5-15 minutes to obtain a second mixed system; filtering the second mixed solution to take solids and washing until the washing liquid is neutral to obtain a primary product; and putting the primary product into 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 the intercalation efficiency is higher. The expanded multiplication rate of the prepared expanded graphite can reach 500-700ml / g; the steps are simple; continuous reaction and a short production cycle can be achieved; 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
Inventor 王三胜
Owner 北京鼎臣石墨科技有限公司
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