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
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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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