High-temperature-resistant graphite material and preparation method thereof

A graphite material, high temperature resistant technology, applied in the field of graphite, can solve the problems of loss of compression resilience and stress relaxation rate, poor mechanical strength of flexible graphite materials, weight loss due to oxidation, etc. Low weight loss effect

Inactive Publication Date: 2018-05-29
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In ordinary high-temperature environments, such as around 200°C, due to the poor mechanical strength of flexible graphite materials, its application is affected. In higher temperature environments, flexible graphite materials will oxidize and lose weight, lose compression resilience and stress relaxation. rate sealing characteristics
Moreover, even if the existing flexible graphite materials can avoid the above-mentioned deficiencies, it is to be further improved on the basis of flexible graphite materials, the process is complicated, and the cost is increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In an embodiment of the present invention, a method for preparing a high temperature resistant graphite material includes the following steps.

[0023] 1) Add flake graphite to 2mol / L glycolic acid solution according to the solid-to-liquid ratio of 1g:4mL, heat to 80°C, and keep the temperature constant for 80min to prepare mixture A.

[0024] 2) Add ethyl orthosilicate and aminopropyltrimethoxysilane to mixture A, heat at 65°C for 0.8h, after the reaction is complete, filter with suction, wash until neutral, and vacuum dry at 60°C for 10h to obtain Mixture B; the mass ratio of ethyl orthosilicate, aminopropyltrimethoxysilane and flake graphite is 2:1:3.

[0025] 3) Put the prepared mixture B in the hydrazine alcohol hydrate solution, stir and mix well, then carry out hydrothermal reaction, react at 70°C for 1.5h, after the reaction is completed, suction filter, wash until neutral, and vacuum dry at 60°C After 10 hours, graphite material was obtained by expansion; the ...

Embodiment 2

[0027] In an embodiment of the present invention, a method for preparing a high temperature resistant graphite material includes the following steps.

[0028] 1) Add flake graphite to 3mol / L glycolic acid solution at a solid-to-liquid ratio of 1g:6mL, heat to 80°C, and keep the temperature constant for 90min to prepare mixture A.

[0029] 2) Add ethyl orthosilicate and aminopropyltrimethoxysilane to mixture A, heat at 75°C for 1.2h, after the reaction is complete, filter with suction, wash until neutral, and vacuum dry at 60°C for 12h to obtain Mixture B; the mass ratio of ethyl orthosilicate, aminopropyltrimethoxysilane and flake graphite is 3:1:5.

[0030] 3) Put the prepared mixture B in the hydrazine alcohol hydrate solution, stir and mix well, then carry out hydrothermal reaction, react at 80°C for 1.8h, after the reaction is completed, suction filter, wash until neutral, and vacuum dry at 60°C After 12 hours, graphite material was obtained by expansion; the mass ratio o...

Embodiment 3

[0032] In an embodiment of the present invention, a method for preparing a high temperature resistant graphite material includes the following steps.

[0033] 1) Add flake graphite to 2.5mol / L glycolic acid solution at a solid-to-liquid ratio of 1g:5mL, heat to 80°C, and keep the temperature constant for 80min to prepare mixture A.

[0034] 2) Add tetraethyl orthosilicate and aminopropyltrimethoxysilane to mixture A, heat at 70°C for 1 hour, after the reaction is complete, filter with suction, wash until neutral, and vacuum dry at 60°C for 10 hours to obtain the mixture B; The mass ratio of ethyl orthosilicate, aminopropyltrimethoxysilane and flake graphite is 2:1:3.

[0035] 3) Put the prepared mixture B in the hydrazine alcohol hydrate solution, stir and mix well, then carry out hydrothermal reaction, react at 75°C for 1.6h, after the reaction is completed, suction filter, wash until neutral, and vacuum dry at 60°C After 10 hours, graphite material was obtained by expansion...

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PUM

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Abstract

The invention discloses a high-temperature-resistant graphite material and a preparation method thereof. The preparation method includes steps: in preparation, adding graphite into 2-3mol/L glycolic acid solution according to a solid-liquid ratio of 1g:4-6mL, heating to 80 DEG C, and keeping the temperature for 80-90min to obtain a mixture A; adding tetraethyl orthosilicate and aminopropyl trimethoxy silane into the mixture A, heating to 65-75 DEG C to allow reaction for 0.8-1.2h, performing suction filtration, washing to a neutral state, and performing vacuum drying to obtain a mixture B; adding the mixture B into hydrazine hydrate alcoholic solution, stirring, well mixing, performing hydrothermal reaction for 1.5-1.8h at 70-80 DEG C, performing suction filtration, washing to a neutral state, and performing vacuum drying and expansion to obtain the graphite material. The graphite is subjected to glycolic acid, tetraethyl orthosilicate, aminopropyl trimethoxy silane and hydrazine hydrate treatment to obtain the graphite material, thermal weight loss is reduced, extremely high temperature resistance is achieved, the service life is prolonged, tensile strength is improved, and expansion volume increasing, retreatment procedure reduction and cost reduction are realized.

Description

technical field [0001] The invention relates to the technical field of graphite, in particular to a high-temperature-resistant graphite material and a preparation method thereof. Background technique [0002] Graphite is an allotrope of elemental carbon. The periphery of each carbon atom is connected with three other carbon atoms (multiple hexagons arranged in a honeycomb pattern) to form a covalent molecule. Expanded Graphite (EG for short) is a loose and porous worm-like substance obtained from natural graphite flakes through intercalation, washing, drying, and high-temperature expansion. In addition to the excellent properties of natural graphite itself, such as cold and heat resistance, corrosion resistance, and self-lubrication, EG also has softness, compression resilience, adsorption, ecological environment coordination, biocompatibility, and radiation resistance that natural graphite does not have. and other characteristics. With the development of material science,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21C01B32/225
Inventor 王启立吕邦民彭家春巩剑南闫伟东于鸣泉李小川
Owner CHINA UNIV OF MINING & TECH
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