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A kind of antioxidant and application thereof for improving the oxidation resistance of flake graphite

An anti-oxidant and anti-oxidation technology, applied in directions such as graphite, can solve the problems of uneven dispersion of antioxidants, unstable anti-oxidation rate, poor material binding force, etc., and achieve the effect of stable anti-oxidation rate, simple method, and not easy to raise dust.

Active Publication Date: 2021-12-17
GUANGZHOU MECHANICAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide an antioxidant for improving the oxidation resistance of flake graphite and its application, so as to solve the problem of poor high temperature resistance of existing graphite products, and the output folds during high temperature expansion. Large damage, uneven dispersion of antioxidants, poor bonding with materials, unstable anti-oxidation rate and other technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An embodiment of the antioxidant for improving the oxidation resistance of flake graphite in the present invention, the composition of the antioxidant is shown in Table 1. Use 120 parts by weight of the antioxidant to completely immerse 80 parts by weight of 50 mesh natural flake graphite, and use the solution impregnation method to impregnate the antioxidant into the natural flake graphite, set the immersion temperature to 75-85 ° C, and use a semiconductor made of silica The constant temperature system controls the temperature fluctuation within the range of ± 2°C. At the same time, the biaxial stirring paddle is used to stir for more than 90 minutes to promote the penetration of antioxidants into the interstitial gaps of natural flake graphite, and finally obtain dry anti-oxidation graphite, which is used to prepare puffed graphite. After the worm graphite. The output rate of worm graphite (that is, the output rate of flexible graphite) reaches 89%, and the 670°C / h l...

Embodiment 2

[0028] An embodiment of the antioxidant for improving the oxidation resistance of flake graphite in the present invention, the composition of the antioxidant is shown in Table 2. Use 120 parts by weight of the antioxidant to completely immerse 80 parts by weight of 50 mesh natural flake graphite, and use the solution impregnation method to impregnate the antioxidant into the natural flake graphite, set the immersion temperature to 75-85 ° C, and use a semiconductor made of silica The constant temperature system controls the temperature fluctuation within the range of ± 2°C. At the same time, the biaxial stirring paddle is used to stir for more than 90 minutes to promote the penetration of antioxidants into the interstitial gaps of natural flake graphite, and finally obtain dry anti-oxidation graphite, which is used to prepare puffed graphite. After the worm graphite. The output rate of worm graphite (that is, the output rate of flexible graphite) reaches 83%. The loss on ignit...

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PUM

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Abstract

The invention provides an antioxidant for improving the oxidation resistance of flake graphite and an application thereof, belonging to the field of graphite materials. Antioxidant of the present invention comprises phosphoric acid, oxalic acid, ethanol and polyethylene glycol, and wherein phosphoric acid and oxalic acid can synergistically improve the oxidation resistance of flake graphite and the output rate of flexible graphite after expansion; Ethanol can make phosphoric acid, oxalic acid, polyethylene glycol as diluent Ethylene glycol is in full contact with flake graphite; polyethylene glycol, as a dispersant, can disperse phosphoric acid and oxalic acid in flake graphite evenly and with strong binding force, ensuring that the antioxidant-treated graphite has a uniform composition and an anti-oxidation rate Stable; the solution impregnation method is used to fully infiltrate the antioxidant into the gaps of the graphite flakes, which can not only uniformly and greatly improve the oxidation resistance of graphite, but also has a simple method and is not easy to raise dust.

Description

technical field [0001] The invention belongs to the field of graphite materials, and relates to an antioxidant for improving the oxidation resistance of flake graphite and an application thereof. Background technique [0002] Following the carcinogenic risk of asbestos materials to humans, after being banned internationally, flexible graphite, as a new type of sealing material with good resilience, self-lubrication and high temperature resistance, has been widely used in various ultra-high temperature work Environment, especially high temperature and high pressure sealing of fluid equipment. Now the world is studying to improve the oxidation resistance of graphite in high temperature environment so as to improve the ability of graphite to resist burning out at high temperature. At present, the graphite oxidation resistance of German SGL company is the best, and their best technical parameters can achieve 670 ℃ / h (670 ℃ 1h) loss on ignition is less than 1%; at the same tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/21
CPCC01B32/21
Inventor 黄兴王文虎耿艳春
Owner GUANGZHOU MECHANICAL ENG RES INST