Expansible graphite with low thermal weight loss and high purity and preparation method thereof

An expanded graphite, high-purity technology, applied in the field of polymer functional material preparation, can solve the problems of increased thermal weight loss of sealed products, and achieve the effects of rapid heat energy, wide applicable temperature range, and high thermal conductivity

Active Publication Date: 2012-08-08
宜昌埃立特密封材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is no discussion and research on the effective protection of graphite carbon in the seal. Therefore, when the expandable graphite produced in the prior art is processed again to make a sealing product for high-temperature sealing, the temperature of the sealing environment will increase. The thermal weight loss of sealing products increases sharply, the main reason is that there is no case of research on the technical protection of graphite carbon used in sealing products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Put the expandable graphite in the drying tank, the temperature of the drying tank is controlled at 25°C, so that each grain of graphite is heated evenly, when the moisture content of the expandable graphite drops to 0.5-1%, according to the graphite mass 0.4% uniform spray mass percentage concentration of 54% sodium phosphate solution, after the sodium phosphate solution is evenly distributed on the graphite particles, continue to stir, then 0.2% of the graphite mass, 54% mass percentage concentration of sodium molybdate solution sprayed on the On the graphite particles, stir evenly, and the speed of rotating and stirring should not damage the graphite flakes. After the stirring is completed, store it in plastic mulch for 12-16 hours. Keep it closed as much as possible during storage. After storage, you can get low thermal weight loss and high purity expandable graphite. .

[0020] The obtained expandable graphite contains 99.5% carbon; 0.36% phosphorus; 0.0...

Embodiment 2

[0021] Example 2: Put the expandable graphite in the drying tank, the temperature of the drying tank is controlled at 30°C, so that each particle of graphite is heated evenly, when the moisture content of the expandable graphite drops to 0.5--1%, according to the graphite mass 0.8% of the mass percentage concentration of 0.8% of the graphite mass is evenly sprayed with a concentration of 52% sodium phosphate solution. After the sodium phosphate solution is evenly distributed on the graphite particles, continue to stir, and then the mass percentage concentration of 0.4% of the graphite mass is 50%. The sodium molybdate solution is sprayed on the On the graphite particles, stir evenly, and the speed of rotating and stirring should not damage the graphite flakes. After the stirring is completed, store it in plastic mulch for 12-16 hours. Keep it closed as much as possible during storage. After storage, you can get low thermal weight loss and high purity expandable graphite. .

[...

Embodiment 3

[0023] Example 3: Put the expandable graphite in the drying tank, the temperature of the drying tank is controlled at 35°C, so that each particle of graphite is evenly heated, and when the moisture content of the expandable graphite drops to 1%, the graphite mass should be 1.2% Evenly spray the sodium phosphate solution with a mass percentage concentration of 50%. After the sodium phosphate solution is evenly distributed on the graphite particles, continue stirring, and then spray 0.6% of the graphite mass with a mass percentage concentration of 50% sodium molybdate solution on the graphite particles. , Stir evenly, and the speed of rotation and stirring should not damage the graphite scales. After the stirring is completed, store it in plastic mulch for 12-16 hours. Keep it closed as much as possible during storage. After storage, high-purity expandable graphite with low thermal weight loss is obtained.

[0024] The obtained expandable graphite contains 99.1% carbon; 0.04% pho...

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Abstract

The invention relates to expansible graphite with low thermal weight loss and high purity. A preparation method of the expansible graphite with low thermal weight loss and high purity comprises the following steps of: placing expansible graphite in a drying tank to uniformly heat every grain of graphite; uniformly spraying a sodium phosphate solution according to the ratio of 0.4-1.2% of the massof graphite when the moisture of the expansible graphite is reduced to 0.5-1%, and continuing to stir after the sodium phosphate solution spreads over the graphite grains; uniformly spraying a sodiummolybdate solution according to the ratio of 0.2-0.6% of the mass of graphite, and uniformly stirring; and storing the expansible graphite to obtain the expansible graphite with low thermal weight loss and high purity. The thermal weight loss of the graphite obtained by the invention is detected to be 1-8% under the condition of 670 DEG C, and the service life of the product is long. The graphitehas the high temperature resistance range of 600-3000 DEG C and wide applicable temperature range. By adopting the invention, the defect that the product obtained by the prior art has poor high temperature resistance and can only be used in the environment lower than 600 DEG C is overcome.

Description

technical field [0001] The present invention relates to the technical field of polymer functional material preparation, and specifically relates to a high-purity expandable graphite with low thermal weight loss and a preparation method thereof. Background technique [0002] The existing expandable graphite production methods are as follows: one is to use caustic soda to heat and dry large flake graphite, wash and purify it, and then acidify the graphite with sulfuric acid and hydrogen peroxide to produce expandable graphite, which is called acid. Alkali method; the second is to use hydrofluoric acid to purify graphite, and then use sulfuric acid and potassium permanganate to make expandable graphite, and use sulfuric acid and perchloric acid to make expandable graphite, collectively referred to as pure acid method; the third is mainly The graphite is purified and acidified with nitric acid to produce expandable graphite. [0003] The expandable graphite produced by the abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 刘兴全龚尚文王华梁绪春
Owner 宜昌埃立特密封材料有限公司
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