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Modified polytetrafluoroethylene composite material and its preparation method and sealing element

A technology of polytetrafluoroethylene and composite materials, which is applied in the direction of engine components, engine seals, mechanical equipment, etc., can solve the problems of piston/piston rod wear, hardness, high modulus, engine environmental pollution, etc., and achieve improved wear resistance Wear performance, improve wear resistance, improve the effect of sealing performance

Active Publication Date: 2021-09-21
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After filling and modifying PTFE, its wear resistance can be improved to a certain extent, but its mechanical properties tend to decrease
For the modification of PTFE materials for aero-engine seals, there are two types of existing reinforcing fillers: one is high-modulus fillers such as glass fibers, carbon fibers, metal particles or ceramic particles, which generally have hardness and modulus. If the problem is too high, once it is worn out, it will backfire the hydraulic mechanism, resulting in the wear of the piston / piston rod, which will bring greater harm to the aero-engine; the other type is colored lubricating fillers, such as graphite, graphite Carbon-based materials such as alkene and carbon nanotubes, once ground out, will contaminate aviation oil, thereby causing pollution to the engine environment

Method used

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preparation example Construction

[0020] An embodiment of the present invention provides a method for preparing a modified polytetrafluoroethylene composite material, including pressing and sintering the mixed powder; the mixed powder includes the following components in weight percentage: polytetrafluoroethylene 57 %~85%, polyphenylene 8%~18%, polyetheretherketone 5%~20%, polyamideimide 2%~5%.

[0021] Polyphenylene can improve the adsorption capacity of the transfer film, and it is easy to form microfibers in the molten state. It can improve the wear resistance of PTFE to a certain extent at room temperature, and can significantly improve the wear resistance of PTFE at high temperatures. Therefore, the addition of polyphenylene is beneficial to solve the problem of thermal deformation of composite materials during grinding. "Transfer film" means that the modified PTFE composite material is rubbed against other materials during the working state. During the friction process, debris will be worn off and transf...

Embodiment 1

[0056] 1. Mix 8g polyphenylene ester powder, 5g polyether ether ketone powder and 2g polyamideimide powder in a high-speed mixer, mix intermittently for 3 minutes, then add 85g polytetrafluoroethylene powder and mix intermittently 2min.

[0057] 2. Place the mixed powder at room temperature (23°C~25°C) for 24 hours, then place the composite powder in a steel mold for powder cold pressing, and the pressing pressure is 27Mpa to obtain a prefabricated part. Then the prefabricated part is placed in a sintering furnace for high-temperature sintering at a temperature of 380° C., and finally a blank of the modified polytetrafluoroethylene aero-engine seal is obtained.

Embodiment 2

[0059] 1. Mix 13g polyphenylene ester powder, 13g polyether ether ketone powder and 3g polyamideimide powder in a high-speed mixer, mix intermittently for 3 minutes, then add 71g polytetrafluoroethylene powder and mix intermittently 2min.

[0060] 2. Place the mixed powder at room temperature (23°C~25°C) for 24 hours, then place the composite powder in a steel mold for powder cold pressing, and the pressing pressure is 27Mpa to obtain a prefabricated part. Then the prefabricated part is placed in a sintering furnace for high-temperature sintering at a temperature of 380° C., and finally a blank of the modified polytetrafluoroethylene aero-engine seal is obtained.

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Abstract

The invention relates to a preparation method of a modified polytetrafluoroethylene composite material, comprising: pressing and sintering a mixed powder; in parts by weight, the mixed powder includes the following components in weight percentage: polytetrafluoroethylene Vinyl fluoride 57%~85%, polyphenylene 8%~18%, polyetheretherketone 5%~20%, polyamideimide 2%~5%. The invention also relates to the modified polytetrafluoroethylene composite material prepared according to the preparation method of the modified polytetrafluoroethylene composite material. The present invention further relates to a seal for an aero-engine made of the modified polytetrafluoroethylene composite material.

Description

technical field [0001] The invention relates to the technical field of friction materials, in particular to a modified polytetrafluoroethylene composite material, a preparation method thereof and a sealing element. Background technique [0002] As a special engineering plastic, polytetrafluoroethylene (PTFE) is widely used in many fields. It has the characteristics of good acid, alkali and solvent resistance, high and low temperature resistance, and most importantly, compared with other materials, PTFE's Low coefficient of friction, excellent self-lubricating performance and chemical stability, it is a good sealing material, especially an ideal material for making seals for aero-engines. Aeroengine seals are mainly used in hydraulic systems, where they mainly play the role of protection, lubrication and wear resistance. Sealing elements play a vital role in the related mechanical equipment of aero-engines. Sealing elements used in hydraulic systems often need to withstand e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08L67/04C08L61/16C08L79/08F16J15/00
CPCC08L27/18C08L2201/08C08L2205/035F16J15/00C08L67/04C08L61/16C08L79/08
Inventor 朱巧思郭建强李炯利王旭东罗圭纳王刚
Owner 北京石墨烯技术研究院有限公司