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A kind of preparation method of expanded graphite

A technology of expanded graphite and flake graphite, which is applied in the direction of graphite, etc., can solve the problems of difficult continuous production of graphite and long production cycle of expanded graphite, and achieve the effect of complete oxidation of graphite, short production cycle and continuous reaction

Active Publication Date: 2019-01-22
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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  • A kind of preparation method of expanded graphite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of preparation method of expanded graphite of the present invention, such as figure 1 shown, including the following steps:

[0038] S1. Prepare a first mixed solution, including sodium chlorate and perchloric acid, and the ratio of the sodium chlorate to the perchloric acid is 0.1 g: 6 mL.

[0039] S2. Add the first mixed solution to the flake graphite, stir at 30°C at 100r / min for 3min, and then stir at 300r / min for 20min to obtain the first mixed system; the particle size of the flake graphite is 30 mesh, and the flake graphite The ratio with the first mixed solution is 3g:4mL.

[0040] The first mixing system was subjected to ultrasonic vibration for the first time for 8 minutes, and the ultrasonic power was 600w.

[0041] S3. Configure a second mixed solution, including potassium permanganate, perchloric acid and phosphoric acid; the ratio of potassium permanganate, perchloric acid and phosphoric acid in the second mixed solution is 1g: 3mL : 1mL.

[0042]...

Embodiment 2

[0049] A kind of preparation method of expanded graphite of the present invention, comprises the steps:

[0050] S1. Prepare a first mixed solution, including sodium chlorate and perchloric acid, the ratio of the sodium chlorate to the perchloric acid is 2g:4mL.

[0051] S2. Add the first mixed solution into the flake graphite, stir at 20°C at 80r / min for 5min, and then stir at 280r / min for 30min to obtain the first mixed system; the particle size of the flake graphite is 20 mesh, and the flake graphite The ratio with the first mixed solution is 2g:1mL.

[0052] The first mixing system was subjected to ultrasonic vibration for the first time for 5 minutes, and the ultrasonic power was 800w.

[0053] S3. Configure a second mixed solution, including potassium permanganate, perchloric acid and phosphoric acid; the ratio of potassium permanganate, perchloric acid and phosphoric acid in the second mixed solution is 2g: 6mL : 0.1mL.

[0054] S4. Add the second mixed solution into...

Embodiment 3

[0060] A kind of preparation method of expanded graphite of the present invention, comprises the steps:

[0061] S1. Prepare a first mixed solution, including sodium chlorate and perchloric acid, and the ratio of the sodium chlorate to the perchloric acid is 1 g: 1 mL.

[0062] S2. Add the first mixed solution to the flake graphite, stir at 45°C at 120r / min for 1min, and then stir at 350r / min for 10min to obtain the first mixed system; the particle size of the flake graphite is 35 mesh, and the flake graphite The ratio with the first mixed solution is 2g:3mL.

[0063] The first mixing system was subjected to ultrasonic vibration for the first time for 10 minutes, and the ultrasonic power was 500w.

[0064] S3, configure the second mixed solution, including potassium permanganate, perchloric acid and phosphoric acid; the ratio of the potassium permanganate, the perchloric acid and the phosphoric acid in the second mixed solution is 0.1g: 1mL: 2mL.

[0065] S4. Add the second...

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Abstract

The invention relates to the field of new materials and provides a method for preparing expandable graphite. The method comprises the following steps: preparing a first mixture solution containing sodium chlorate and perchloric acid; adding the first mixture solution into scale graphite, and carrying out a reaction for 15 to 35 minutes at the temperature of 20 DEG C to 45 DEG C with stirring, so as to obtain a first mixture system; preparing a second mixture solution containing potassium permanganate, perchloric acid and phosphoric acid; adding the second mixture solution into the first mixture system, and carrying out a reaction for 5 to 15 minutes at the temperature of 20 DEG C to 45 DEG C with stirring, so as to obtain a second mixture system; filtering the second mixture system to obtain solids, and washing the solids until washing liquid is neutral, so as to obtain a primary product; burning the primary product in an environment with the temperature of 850 DEG C to 1,000 DEG C until the volume does not change any more, thereby obtaining the expandable graphite. According to the method for preparing the expandable graphite, the graphite oxidation is more thorough, the intercalation efficiency is higher, and the expansion multiplying factor of the prepared expandable graphite can reach 500ml / g to 700ml / g; the steps are simple, continuous reaction can be achieved, and the production cycle is short, so that the method is applicable to 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 Patents(China)
IPC IPC(8): C01B32/20
Inventor 王三胜
Owner 北京鼎臣石墨科技有限公司
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