PTFE waterproof and breathable membrane is produced by free radical polymerization of tetrafluoroethylene.
Industrial polymerization reactions are carried out with stirring in the presence of a large amount of water to disperse the heat of reaction and facilitate temperature control.
Polymerization is generally carried out at 40~80°C and under a pressure of 3~26 kgf/cm2. Inorganic persulfate and organic peroxide can be used as initiators, or a redox initiating system can be used.
Waterproof and breathable membrane, generally called “non-stick coating” or “easy-to-clean material”, is a synthetic polymer material that uses fluorine to replace all hydrogen atoms in polyethylene.
This material is acid-resistant, alkali-resistant, resistant to various organic solvents, and is almost insoluble in all solvents.
Dispersion polymerization requires the addition of perfluorinated surfactants, such as perfluorooctanoic acid or its salts.
PTFE waterproof and breathable membrane can be formed by compression or extrusion processing, or it can be made into a water dispersion for coating, impregnation or fiber making.
Widely used as high and low temperature resistant, corrosion resistant materials, insulation materials, anti-stick coatings, etc.
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