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Sealing element and its preparation method

A technology of sealing components and polydopamine, which is applied in the direction of engine components, engine seals, mechanical equipment, etc., can solve the problems of high friction coefficient and unstable friction performance of materials, improve wear resistance and friction performance, and reduce oil leakage , Excellent wear resistance and friction 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 it is easy to cause the friction coefficient of the material to be too large or the friction performance to be unstable

Method used

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  • Sealing element and its preparation method

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Effect test

preparation example Construction

[0021] An embodiment of the present invention provides a method for preparing a modified polytetrafluoroethylene composite material, which includes pressing and sintering the mixed powder; in parts by weight, the mixed powder includes the following components in weight percentage: Polytetrafluoroethylene 57%~85%, polyphenylene 8%~18%, polyetheretherketone 5%~20%, polyamideimide 2%~5%.

[0022] 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 wil...

Embodiment 1

[0069] 1. Mix 50mL of ethanol, 100mL of deionized water and 2mL of ammonia water evenly with magnetic stirring at 25°C and 300rpm for 60min, then add 25mL of dopamine solution (40mg / mL) and continue to stir for 50h. Polydopamine nanospheres (PDAPs) were generated after several times of centrifugal washing and drying.

[0070] 2. Mix 8g polyphenylene ester powder, 5g polyether ether ketone powder, 2g polyamideimide powder and 5g polydopamine nano-microspheres in a high-speed mixer, mix intermittently for 3 minutes, and then add 80g polytetrafluoroethylene Ethylene powder was mixed, intermittently mixed for 2 minutes.

[0071] 3. 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. to obtain a sealing elem...

Embodiment 2

[0074] 1. Mix 50mL of ethanol, 100mL of deionized water and 1.8mL of ammonia water evenly with magnetic stirring. Stirring temperature is 25°C, stirring speed is 300rpm, stirring for 40min, then add 20mL dopamine solution (40mg / mL), continue stirring for 50h, the reaction ends After several times of centrifugal washing and drying, polydopamine nanospheres (PDAPs) were generated.

[0075] 2. Mix 13g polyphenylene powder, 13g polyether ether ketone powder, 3g polyamideimide powder and 4g polydopamine nano-microspheres in a high-speed mixer, mix intermittently for 3 minutes, and then add 67g polytetrafluoroethylene Ethylene powder was mixed, intermittently mixed for 2 minutes.

[0076]3. Place the mixed composite 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-temper...

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Abstract

The invention relates to a preparation method of a sealing element, comprising the steps of pressing and sintering a mixed powder to obtain a matrix, wherein the mixed powder includes the following components in weight percentage: polytetrafluoroethylene 54% ~80%, polyphenylene 8%~18%, polyetheretherketone 5%~20%, polyamideimide 2%~5%, polydopamine nanospheres 1%~5%; and, in the A polydopamine coating is formed on the surface of the substrate. The invention also relates to the sealing element prepared according to said preparation method.

Description

technical field [0001] The invention relates to the technical field, in particular to a sealing element and a preparation method thereof. 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 extreme pressure, load and temperature, but PTFE has poor wear resistance, is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08L67/04C08L61/16C08L79/08C08L79/04F16J15/00
CPCC08L27/18C08L2205/035F16J15/00C08L67/04C08L61/16C08L79/08C08L79/04
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
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