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Polytetrafluoroethylene multi-layer composite film and its protective material preparation method

A polytetrafluoroethylene, multi-layer composite film technology, applied in chemical instruments and methods, lamination, layered products, etc., can solve the problems of skin irritation, corrosion of fabrics, difficulty in regeneration, etc., and achieves simple process and low cost. Low, significant economic and social benefits

Inactive Publication Date: 2008-01-16
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vapor-permeable protective clothing was first developed by the United States in the late 1950s. It uses chloramine-impregnated fabrics and is equipped in non-chemical defense professional troops. It overcomes the shortcomings of butyl rubber protective clothing, and has better vapor permeability and heat dissipation performance. , but there are the following disadvantages: one is that chloramine is selective for the absorption of poison; the other is that chloramine has a stimulating effect on the skin;
A large number of activated carbon particles or activated carbon fibers are used in vapor-permeable protective clothing, and their strong adsorption properties are used to achieve the purpose of biochemical protection, but the disadvantages are short service life and difficult regeneration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] [Example 1] Preparation of polytetrafluoroethylene multilayer composite film

[0040] (1) Fully mix 1 kilogram of expanded polytetrafluoroethylene resin powder and 0.5 kilogram of liquid paraffin, and form a polytetrafluoroethylene mixture after placing;

[0041] (2) The above-mentioned polytetrafluoroethylene mixture is pressed into a cylindrical blank, and the blank is extruded into a rod by a pusher, and then the rod is calendered into a polytetrafluoroethylene base tape;

[0042] (3) Stretch the above-mentioned polytetrafluoroethylene base tape longitudinally at 180° C., and process it into a degreased base tape;

[0043] (4) The three layers of the above-mentioned degreasing base belt / moisture-permeable polyurethane film / the described degreasing base belt are stretched longitudinally at 100° C., and processed into a sandwich composite base belt, and the thickness of the moisture-permeable polyurethane film used is 12 microns;

[0044] (5) The above-mentioned sandw...

Embodiment 7

[0048] [Example 7] Prepare the protective material containing the polytetrafluoroethylene multilayer composite film prepared by the above method

[0049] The polyester adhesive was transferred to the fabric by the powder dot method, and the composite film prepared in Example 1 and the polyester woven fabric were passed through a pressure roller with a surface temperature of 170° C. to prepare a vapor-permeable protective material.

[0050] According to the method of GB / T12704-1991, FZ / T01004-1991 and WSB58-2003 general specification, the protective material of polytetrafluoroethylene multilayer composite film prepared by the above method is tested, and its vapor permeability reaches 7800 grams per square meter. 24 hours, water pressure resistance 190 kPa, filtration efficiency of microorganisms in the air ≥ 99%, filtration efficiency of microorganisms such as poliovirus in liquid ≥ 99%. After 20 times of water washing, the performance of the above materials basically does not ...

Embodiment 8

[0051][Example 8] Prepare the protective material containing the polytetrafluoroethylene multilayer composite film prepared by the above method

[0052] The polyurethane adhesive was transferred to the fabric by the slurry dot method, and the composite film prepared in Example 2 and the polyester woven fabric were passed through a pressure roller with a surface temperature of 160° C. to prepare a vapor-permeable protective material.

[0053] According to the method of GB / T12704-1991, FZ / T01004-1991 and WSB58-2003 general specification, the protective material of the polytetrafluoroethylene multilayer composite film prepared by the above method is tested, and its vapor permeability reaches 6000 grams per square meter. 24 hours, resistant to water pressure of 200 kPa, filtration efficiency of microorganisms in the air ≥ 99%, and filtration efficiency of microorganisms such as poliovirus in liquid ≥ 99%. After 20 times of water washing, the performance of the above materials basi...

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Abstract

The invention relates to a multi-layer polytetrafluoroethylene composite film and protective material making method thereof. The method is characterized in that a polytetrafluoroethylene base band and a thermoplastic permeable film are drawn longitudinally together under the temperature of 100 to 200 DGE C and then are drawn widthwise together on an expander under the temperature of 50 to 300 DGE C and at last are sintered to stereotype under the temperature of 200 to 400 DGE C, in this way the multi-layer composite film is made. With the method of laminating, the composite film is made into a protective material with machine woven fabric, knitted fabric or non-woven fabric through bonds. The protective material has a steam permitting capability of 3000 to 12000g per square meters per 24 hours, a hydraulic pressure bearing capability of 50 to 220 thousand pa, the filtration efficiency for the microorganism in the air equal to or more than 99 percent, and the filtration efficiency of the polioviruses in liquid equal to or more than 99 percent. The capability of the invention does not impair after washing for a plurality of times. The protective material can be widely used as biochemical protection material, waterproof and permeable material, and windproof and warm keeping material.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene multilayer composite film and a preparation method thereof. Background technique [0002] In the prior art, protective fabrics made of polytetrafluoroethylene microporous membranes have been patented. Although they have good waterproof and moisture-permeable properties, their waterproof and other protective properties will be greatly reduced during the washing process. directly affect the use effect. In recent years, although the invented polytetrafluoroethylene composite membrane has solved this problem, the process is often complicated, the cost is high, and the moisture permeability is greatly reduced at the same time, which affects the wearing comfort. [0003] In the past, biochemical protective clothing mainly used the isolation type, and its principle was to isolate the polluted air or poison droplets from the air of the human skin to achieve the purpose of anti-virus. The material used is mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C43/00B29C47/12B29C43/24B29C55/06B29C55/14B29C67/04B32B37/15B29K27/18B29K23/00B29K67/00B29K75/00B29L9/00B29C48/30
Inventor 郝新敏张建春郭玉海
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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