Polytetrafluoroethylene special adhesive. Polytetrafluoroethylene has excellent comprehensive performance, high temperature resistance, corrosion resistance, non-stick, self-lubricating, excellent dielectric properties, very low coefficient of friction.
Used as engineering plastics, can be made of PTFE tubes, rods, bands, plates, films, etc., generally used in high performance requirements of corrosion-resistant pipes, containers, pumps, valves, and the system of radar, high-frequency communication equipment, radio equipment, and so on. PTFE in any filler that can withstand the PTFE sintering temperature, mechanical properties can be greatly improved, while maintaining the other excellent properties of PTFE.
The filler varieties are glass fiber, metal, metallized oxides, graphite, molybdenum disulfide, carbon fiber, polyimide, EKONOL, etc., abrasion resistance, the limit of the PV value can be increased by 1000 times.
Extended information
Polytetrafluoroethylene tubing selection of suspension polymerization of polytetrafluoroethylene resin by plunger extrusion process. In the known plastics PTFE has the best chemical resistance and dielectric properties.
Polytetrafluoroethylene braided packing is a good dynamic sealing material, is made of expanded polytetrachloroethylene strips braided, with a low coefficient of friction, abrasion, chemical corrosion, good sealing, non-hydrolysis, no change in the hardness of the excellent performance. Used in a variety of media work in the liner seals and lubricating materials, as well as in a variety of frequencies used in the electrical insulation parts, capacitor media, wire insulation, electrical instrumentation insulation.
Polytetrafluoroethylene radiation resistance is poor, caused by high-energy radiation degradation, the electrical properties of polymers and mechanical properties are significantly reduced. Polytetrafluoroethylene is generated by free radical polymerization of tetrafluoroethylene.
The industrial polymerization reaction is stirred in the presence of a large amount of water to disperse the reaction heat, and to facilitate the control of temperature. Polymerization is generally carried out at 40 ~ 80 ℃, 3 ~ 26 kg force / cm pressure, can be used inorganic persulfate, organic peroxide as initiator, can also be used in redox initiation system.
Per mole of tetrafluoroethylene polymerization exothermic 171.38 kJ. Dispersive polymerization must be added to perfluorinated surfactants, such as perfluorooctanoic acid or its salts.