Heat-conducting polytetrafluoroethylene sealing gasket

A technology of polytetrafluoroethylene and polytetrafluoroethylene powder, which is applied in the field of heat-conducting polytetrafluoroethylene sealing gaskets, can solve problems such as potential safety hazards, poor thermal conductivity of polytetrafluoroethylene, overheating of pipelines, etc., and achieve enhanced mechanical Performance, promotion of compatibility, effect of enhancing thermal conductivity

Pending Publication Date: 2021-04-02
ANHUI TENGLONG PUMP VALVE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the long-term transportation of high-temperature media in the pipeline, the poor thermal conductivity of PTFE will cause the pipeline to overheat and cause safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A thermally conductive polytetrafluoroethylene sealing gasket, the mass percentage of each component is as follows:

[0022] PTFE powder 82%;

[0023] Oyster shell powder-nanometer silver-polytetrafluoroethylene composite 10%;

[0024] The particle size of the polytetrafluoroethylene powder is 35 μm.

[0025] Further, the preparation method is as follows: Stir oyster shell powder-nano silver-polytetrafluoroethylene composite and polytetrafluoroethylene powder evenly at 20rpm, then place it at -20°C for 30min, and then cold press it at 30 MPa Shaped and kept for 3 minutes, then transferred to a roasting furnace, heated to 230°C at a rate of 1min / °C, fired for 30 minutes, then continued to heat up to 280°C, fired for 20 minutes, heated to 350°C, fired for 20 minutes, and finally baked for 4 The rate of ℃ / min can be lowered to room temperature.

[0026] Further, the preparation method of the oyster shell powder-nanometer silver-polytetrafluoroethylene composite comprise...

Embodiment 2

[0031] A thermally conductive polytetrafluoroethylene sealing gasket, the mass percentage of each component is as follows:

[0032] PTFE powder 86%;

[0033] Oyster shell powder-nanometer silver-polytetrafluoroethylene composite 15%;

[0034] The particle size of the polytetrafluoroethylene powder is 40 μm.

[0035] Further, the preparation method is as follows: Stir oyster shell powder-nano silver-polytetrafluoroethylene composite and polytetrafluoroethylene powder evenly at 40rpm, then place it at -22°C for 35min, and then cold press it at 32 MPa Shaped and kept for 4 minutes, then transferred to a roasting furnace, heated to 235°C at a rate of 2min / °C, fired for 35 minutes, then continued to heat up to 290°C, fired for 25 minutes, heated to 355°C, fired for 25 minutes, and finally heated to 5 The rate of ℃ / min can be lowered to room temperature.

[0036] Further, the preparation method of the oyster shell powder-nanometer silver-polytetrafluoroethylene composite comprise...

Embodiment 3

[0041] A thermally conductive polytetrafluoroethylene sealing gasket, the mass percentage of each component is as follows:

[0042] PTFE powder 90%;

[0043] Oyster shell powder-nanometer silver-polytetrafluoroethylene composite 18%;

[0044] The particle size of the polytetrafluoroethylene powder is 50 μm.

[0045] Further, the preparation method is as follows: Stir oyster shell powder-nano silver-polytetrafluoroethylene composite and polytetrafluoroethylene powder evenly at 50rpm, then place it at -25°C for 40min, and then cold press it at 35 MPa Shaped and kept for 4 minutes, then transferred to a roasting furnace, heated to 240°C at a rate of 4min / °C, fired for 40 minutes, then continued to heat up to 300°C, fired for 30 minutes, heated to 360°C, fired for 30 minutes, and finally heated to 6 The rate of ℃ / min can be lowered to room temperature.

[0046] Further, the preparation method of the oyster shell powder-nanometer silver-polytetrafluoroethylene composite comprise...

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Abstract

The invention discloses a heat-conducting polytetrafluoroethylene sealing gasket. The prepared polytetrafluoroethylene sealing gasket has the advantages of lower volume resistivity, higher heat conductivity coefficient and superior wear resistance. Co60 gamma rays are used for irradiating oyster shell powder, the surface activity of the oyster shell powder can be fully activated, fermentation of the oyster shell powder is promoted, after the oyster shell powder is mixed with chitosan and saccharomycetes for fermentation, the internal structure of the oyster shell powder is changed, the adsorption performance is enhanced, the activity is enhanced, and attachment of nano-silver to the surface of the oyster shell powder is facilitated. The nano-silver is attached to the surface of the oystershell powder, so that on one hand, the characteristic that the nano-silver is easy to agglomerate and not easy to disperse is improved, and on the other hand, the nano-silver promotes the compatibility of the oyster shell powder and a substrate, and the mechanical property of the obtained product is further improved.

Description

technical field [0001] The invention belongs to the technical field of sealing materials, in particular to a heat-conducting polytetrafluoroethylene sealing gasket. Background technique [0002] In the production process of petroleum, chemical and pharmaceutical industries, pipes, valves, containers and other equipment are connected through channels. Generally, a sealing gasket is placed at each flange connection part to seal and prevent leakage. effect. Due to its excellent high temperature resistance, aging resistance and chemical corrosion resistance, PTFE is often used in the sealing field of pipelines or chemical pumps. However, due to the long-term transportation of high-temperature media in the pipeline, the poor thermal conductivity of PTFE will cause the pipeline to overheat and cause safety hazards. Contents of the invention [0003] In view of the above problems, the present invention aims to provide a thermally conductive polytetrafluoroethylene gasket. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K3/26C08K3/08C08K9/12C08K9/00C08K9/04C09K5/14
CPCC08K3/26C08K3/08C08K9/12C08K9/00C08K9/08C09K5/14C08K2003/265C08K2003/0806C08K2201/011C08K2201/001C08L27/18
Inventor 徐向远
Owner ANHUI TENGLONG PUMP VALVE MFG CO LTD
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