Teflon microporous membrane is a kind of microporous membrane made of polytetrafluoroethylene as raw material and using special technology through calendering, extrusion, biaxial stretching and other methods.
The thickness of the Teflon microporous membrane is about 0.01mm, and the air permeability is 60-80L/m2.s. It has smooth surface, chemical resistance, air permeability and water impermeability, large air permeability, flame retardant, high temperature resistance, and strength resistance. Acid-base, non-toxic and other properties, it is widely used in flue gas dust removal and filtration in various industrial furnaces such as chemical industry, steel, metallurgy, carbon black, power generation, cement, waste incineration, etc. It has a node-fine fiber structure and can be Forming hundreds of millions of micropores, it can effectively intercept dust in the air and is very suitable for the field of air purification. Production method: Polytetrafluoroethylene is generated 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 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.
Each mole of tetrafluoroethylene releases heat of 171.38kJ during polymerization.
Dispersion polymerization requires the addition of perfluorinated surfactants, such as perfluorooctanoic acid or its salts.
Among fluoroplastics, polytetrafluoroethylene consumes the most and has the most wide range of uses. Teflon microporous membrane is an important variety among fluoroplastics.
The chemical structure of polytetrafluoroethylene is formed by replacing all hydrogen atoms in polyethylene with fluorine atoms.
Teflon microporous membranes are widely used and can be made into rods, plates, pipes, films and various special-shaped products, and are used in aerospace, chemical industry, electronics, machinery, medicine and other fields.
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