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Manufacturing method for high temperature-resistant high-strength flexible graphite material

A technology of flexible graphite materials and manufacturing methods, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of loss of compression resilience and stress relaxation rate of sealing properties, poor mechanical strength of flexible graphite materials, affecting applications and other problems, to achieve the effect of saving the drying step, saving the process, and enhancing the blasting effect

Active Publication Date: 2013-01-30
CHINA SCI HENGDA GRAPHITE
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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 lose weight due to oxidation, lose compression resilience and stress relaxation. rate sealing characteristics

Method used

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  • Manufacturing method for high temperature-resistant high-strength flexible graphite material

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preparation example Construction

[0021] Preparation of expandable graphite: Add 1000kg of 80 mesh natural flake graphite with a fixed carbon content of 95% in the reaction kettle, add 150kg of ammonium nitrate particles, stir and mix evenly, then add 2000kg of 98% concentrated sulfuric acid, stir for 10 minutes, and then add 500kg of 98% concentrated sulfuric acid was stirred and reacted for 45 minutes. Let the reacted graphite self-flow to the hanging bag centrifugal dehydrator for deacidification for 20 minutes, take out the deacidified graphite and add it to water filled with about 5m3, stir and soak for about 5-10 minutes, and then dehydrate through the centrifugal dehydrator to obtain expanded graphite.

[0022] The preparation method of expandable graphite provided above is only for a clearer and intuitive description of the present invention.

Embodiment 1

[0024] A method for manufacturing a high-temperature resistant high-strength flexible graphite material, specifically comprising the following steps:

[0025] 1) Preparation of additives: Take 12g of phosphoric acid, 8g of aluminum dihydrogen phosphate, 2g of boric acid and 20g of triethyl phosphate, add 400g of water to make an additive solution;

[0026] 2) Add 400g of the above-mentioned expandable graphite into the solution prepared in step 1), soak for 30min;

[0027] 3) Filter the material after soaking, rinse the expandable graphite with the obtained filtrate, repeat twice, suction filter to make the liquid content in the expandable graphite 20% of the total weight, and then dry the expandable graphite to change permanent expandable graphite;

[0028] 4) The modified expandable graphite is expanded and rolled to form a flexible graphite material with high temperature resistance and high strength.

Embodiment 2

[0030] A method for manufacturing a high-temperature resistant high-strength flexible graphite material, specifically comprising the following steps:

[0031] 1) Preparation of additives: Take phosphoric acid, calcium dihydrogen phosphate, boric acid and tributyl phosphate, and add water to make an additive solution. The mass fractions of phosphoric acid, calcium dihydrogen phosphate, boric acid and tributyl phosphate in the solution are 5% respectively. 30%, 1.5%, 10%. ;

[0032] 2) Add the above additive solution to 100g of expandable graphite, immerse the expandable graphite for 20min,

[0033] 3) Filter the soaked material, rinse the expandable graphite with the obtained filtrate, repeat twice, and suction filter to make the liquid content in the expandable graphite 25% of the total weight, and then dry the expandable graphite to change permanent expandable graphite;

[0034] 4) The modified expandable graphite is expanded and rolled to form a flexible graphite material...

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Abstract

The invention provides a manufacturing method for a high temperature-resistant high-strength flexible graphite material. The manufacturing method comprises the following steps: with expandable graphite as a raw material, adding an additive solution into the expandable graphite to soak the expandable graphite; carrying out filtering; repeatedly flushing the soaked expandable graphite with a filtrate and controlling moisture content in the expandable graphite to be 18 to 40% of the total weight of the expandable graphite; drying the expandable graphite to obtain modified expandable graphite; and subjecting the modified expandable graphite to expansion, rolling compaction and molding so as to obtain the high temperature-resistant high-strength flexible graphite material which has low ignition loss and high tensile strength. According to the manufacturing method for the high temperature-resistant high-strength flexible graphite material in the invention, a phosphorus agent and a boron agent are added into the flexible graphite material, so inoxidizability and strength of the material are improved; and the method has the advantages of a simple process, low cost and easy popularization.

Description

technical field [0001] The invention relates to the field of flexible graphite materials, in particular to a method for manufacturing high-temperature-resistant and high-strength flexible graphite materials. Background technique [0002] Flexible graphite, also known as expanded graphite, is a new type of carbon material. Because flexible graphite has strong pressure resistance, plasticity and self-lubrication, and is non-toxic and harmless, it has been highly valued in the field of sealing. Flexible graphite sealing products have been widely used in engines, machinery, automobiles, textiles, chemicals, etc. This industry occupies a very important position in the sealing field. [0003] With the development of material science, sealing materials in the high temperature field also need continuous development and progress. In ordinary high-temperature environments, such as around 200°C, due to the poor mechanical strength of flexible graphite materials, its application is af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/225
Inventor 傅云峰李建立易雪融
Owner CHINA SCI HENGDA GRAPHITE
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