Highly-oil-repellenting highly-waterproof seamless polytef expansion sheet materials and preparation method thereof

A seamless polytetrafluoroethylene, polytetrafluoroethylene technology, used in chemical instruments and methods, flat products, other household appliances, etc., to achieve uniform sealing, good elasticity, and light weight

Active Publication Date: 2013-06-19
HUZHOU SENNUO FLUORINE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on 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

[0038] A method for preparing a highly oil-repellent and highly waterproof seamless polytetrafluoroethylene expanded board, comprising the following steps:

[0039] (1) Mixing

[0040] Mix Zhonghao Chenguang Chemical 216G dispersed polytetrafluoroethylene resin powder, then add aviation kerosene as a hydrocarbon co-solvent; mix the two thoroughly at a weight ratio of 1:0.25; stand at 50°C for 24 hours .

[0041] (2) Blank making, extrusion, calendering

[0042] The mixed material is pre-pressed into a Q120mm cylindrical billet at 50°C, and the billet is compressed at a pusher at 55°C to form a Q22mm round bar, and the round bar is rolled at a calender at 70°C to form an oil-containing base belt with a thickness of is 150 microns.

[0043] (3) Degreasing, longitudinal stretching

[0044] The oil-containing base tape is degreased at 260°C, the extrusion aid is removed, and the first longitudinal stretch is carried out, and the stretching ratio is 4 times; it becomes a degrea...

Embodiment 2

[0055] A method for preparing a highly oil-repellent and highly waterproof seamless polytetrafluoroethylene expanded board, comprising the following steps:

[0056] (1) Mixture:

[0057] Mix the 204 dispersion resin powder produced by Dongyue Company, and then add aviation kerosene hydrocarbon co-solvent; the three are mixed in a ratio of 1:0.28 by weight; stand at 50°C for 24 hours.

[0058] (2) Blank making, extrusion, calendering

[0059] The mixed material is pre-pressed into a cylindrical billet of Q120mm at 50°C, and the billet is pushed into a round bar of Q20mm under the condition of a pusher at 60°C, and the round bar is rolled into an oil-containing base belt at a calender of 70°C, with a thickness of is 120 microns.

[0060] (3) Degreasing, longitudinal stretching

[0061] The oil-containing base tape is degreased at 280°C, the extrusion aid is removed, and the first longitudinal stretch is carried out, and the stretching ratio is 3 times to become a degreased ba...

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Abstract

The invention belongs to the technical field of aerospace sealing materials, and particularly discloses highly-oil-repellenting highly-waterproof seamless polytef expansion sheet materials and a preparation method thereof. The preparation method comprises the following steps: mixing materials, performing, pushing and pressing, calendaring, drying, puffing, sizing, thermocompression bonding, surface chemical processing, and the like. The highly-oil-repellenting highly-waterproof seamless polytef expansion sheet materials which are prepared and obtained by the method have good chemical stability, electrical insulating property, and self-lubrication performance, overcome the cold flow property (creepage) of pure polytef sealing materials, cannot become hard or crisp ( good elasticity) with the time, can bear the temperature range of -65 DEG C - +177 DEG C, are applicable to flat seal of various shapes, and are indispensable and important materials in frontier science and modern industries.

Description

technical field [0001] The invention belongs to the technical field of sealing materials, and more specifically relates to a polytetrafluoroethylene puffed plate with high oil repellency and high water resistance for the field of aerospace sealing materials and a preparation method thereof. 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, and the high oil repellency and high waterproof polytetrafluoroethylene expanded sheet is used beside the aircraft engine. It is a porous material formed from polytetrafluoroethylene material through multi-directional stretching (that is, puffing treatment), calendering, heat treatment and other processes. From the appearance, the surface of the material is smooth 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 insid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/30C08L27/18C08K3/08C08J9/42C08J9/28B29D7/00
Inventor 王中华
Owner HUZHOU SENNUO FLUORINE MATERIAL TECH
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