Process for preparing teflon expanded sealing plate used for space air vehicles
A polytetrafluoroethylene and polytetrafluoroethylene film technology is applied in the field of preparation of expanded polytetrafluoroethylene sealing sheets for aerospace vehicles, and achieves the effects of light weight, uniform sealing and good elasticity
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Embodiment 1
[0018] Embodiment 1: Expanded polytetrafluoroethylene sealing sheet for aerospace vehicles, the thickness is 0.5mm, and the specific steps are:
[0019] 1. Mixing: The ratio of resin to extrusion aid is 100:18, and solvent oil is used as extrusion aid;
[0020] 2. Preforming: the pressure is controlled at 2.7MPa, the holding time is 5min; the compression speed is 58mm / min;
[0021] 3. Pushing: the pushing speed is 0.8mm / s, the L / D is 4.5, and the mold temperature at the pushing port is 55°C;
[0022] 4. Calendering: the calendering speed is 460rpm, and the roller temperature is 75°C;
[0023] 5. Drying of the base film: the drying temperature is 160°C;
[0024] 6. Stretching expansion: the stretching ratio is 4 times, and the stretching temperature is 200°C;
[0025] 7. Shaping: The shaping temperature is 300°C, the shaping pressure is 0.4MPa, and the holding time is 18 minutes.
Embodiment 2
[0026] Embodiment 2: Expanded polytetrafluoroethylene sealing sheet material for aerospace vehicle, thickness is 4.0mm, concrete steps are the same as embodiment 1, the proportioning of resin and extrusion aid is: 100: 22, extrusion aid adopts kerosene; Pressure control At 3.2MPa, the holding time is 7min; the compression speed is 63mm / min; the pushing speed is 0.9mm / s, the L / D is 8, the mold temperature at the pushing port is 60°C; the calendering speed is 450rpm, and the roller temperature 75°C; base film drying: drying temperature is 170°C; stretching expansion: stretching ratio is 7 times, stretching temperature is 250°C; shaping: shaping temperature is 350°C, shaping pressure is 0.7MPa, sheet holding time is 45min.
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