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Method for impregnating graphite by using polytetrafluoroethylene

A technology of polytetrafluoroethylene and impregnated graphite, which is applied in the chemical industry, can solve problems such as poor temperature resistance, achieve the effect of improving corrosion resistance and high temperature resistance, and broadening the application range

Inactive Publication Date: 2019-07-09
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Graphite has been impregnated to become impermeable graphite for the production of heat exchanger equipment and has achieved good results. At present, the most widely used impregnating agent for graphite material is phenolic resin, but the characteristics of phenolic resin itself limit the use of impregnated graphite products in strong The application under the conditions of alkali and strong oxidizing acid, and the temperature resistance is not good, which limits its application range; PTFE has excellent chemical stability, high and low temperature resistance, corrosion resistance, sealing, good Anti-aging endurance and hydrophobicity, etc., except for hydrofluoric acid, does not react with other strong oxidizing acids and strong alkalis

Method used

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  • Method for impregnating graphite by using polytetrafluoroethylene
  • Method for impregnating graphite by using polytetrafluoroethylene
  • Method for impregnating graphite by using polytetrafluoroethylene

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Embodiment

[0019] Embodiment: a kind of method and production technology thereof of polytetrafluoroethylene impregnated graphite, comprise the steps:

[0020] (1) Pretreatment of the graphite material: clean the surface of the graphite sample, dry it in a drying oven (120° C.) to a constant weight and then cool it to room temperature;

[0021] (2) The first impregnation of graphite material: put the dried graphite material in the impregnation kettle, keep the distance between graphite materials at about 5mm, vacuumize to -0.08MPa at room temperature, keep the vacuum state for 4 hours, and use the negative pressure in the kettle to vacuum The polytetrafluoroethylene impregnating agent is sucked into the impregnation kettle, so that the level of the polytetrafluoroethylene impregnating liquid is 10mm-20mm higher than that of the graphite material. After 0.5h, the vacuum is removed, and the pressure in the kettle is increased to 0.7MPa, and the pressure is released after immersing for 5h. T...

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Abstract

The invention discloses a method for impregnating graphite by using polytetrafluoroethylene. The method provided by the invention adopts a manner of three-time immersion-drying and one-time plasticization of graphite by using the polytetrafluoroethylene to fully exert superiority of the polytetrafluoroethylene, and the obtained impregnated graphite is impregnated impervious graphite, can be used for equipment manufacture heat exchangers, and improve corrosion resistance and high-temperature resistance of the graphite heat exchangers, thereby broadening the application range of the product, wherein the temperature resistance can reach 200 DEG C.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a method for impregnating graphite with polytetrafluoroethylene. Background technique [0002] Graphite has been impregnated to become impermeable graphite for the production of heat exchanger equipment and has achieved good results. At present, the most widely used impregnating agent for graphite material is phenolic resin, but the characteristics of phenolic resin itself limit the use of impregnated graphite products in strong The application under the conditions of alkali and strong oxidizing acid, and the temperature resistance is not good, which limits its application range; PTFE has excellent chemical stability, high and low temperature resistance, corrosion resistance, sealing, good Anti-aging endurance and hydrophobicity, etc., except for hydrofluoric acid, it does not react with other strong oxidizing acids and strong alkalis. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/83
CPCC04B41/009C04B41/4846C04B41/83C04B41/4535C04B41/4515C04B41/52C04B35/522
Inventor 田蒙奎邵珠花颜婷珪
Owner GUIZHOU UNIV
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