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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

Active Publication Date: 2005-03-16
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant report about the preparation method of expanded polytetrafluoroethylene sealing sheet for aerospace vehicles at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a process for preparing expanded polytetrafluoroethylene structure sealing plate which consists of material mixing, pre-forming, pulling, calendering, drying, bulking, and shaping. The sealing plate prepared thereby possesses fine chemical stability, electrical insulation property and self-oiliness.

Description

technical field [0001] The invention belongs to the technical field of aerospace sealing materials, and in particular relates to a preparation method of an expanded polytetrafluoroethylene sealing plate for aerospace vehicles. Background technique [0002] Expanded polytetrafluoroethylene new structure sealing sheet is a newly developed sealing material for aviation and aerospace vehicles in the world in recent years. It is a porous material formed from polytetrafluoroethylene material through multi-directional stretching (ie puffing treatment), calendering, heat treatment and other processes. From the appearance, the surface of the material is flat and soft, but under the scanning electron microscope, it can be seen that there are a large number of micropores of 2 μm to 25 μm inside the material, and the porosity can account for more than 60%. This material has the following characteristics: non-hazardous, light in weight, corrosion-resistant, resistant to environmental ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/18C09K3/10
Inventor 方秋利朱兰萍
Owner SHANGHAI PLASTICS RES INST CO LTD
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