Polytetrafluoroethylene (Polytetrafluoroethylene, abbreviated as PTFE) is generally called “non-stick coating” or “easy to clean materials”.
Preparation of polytetrafluoroethylene: In an enamel or stainless steel polymerization kettle, water is used as the medium, potassium persulfate is used as the initiator, the perfluorocarboxylic acid ammonium salt is used as the dispersant, and the fluorocarbon compound is used as the stabilizer. Polymerized to produce polytetrafluoroethylene. Various auxiliaries are added to the reaction kettle, the tetrafluoroethylene monomer enters the polymerization kettle in the gas phase, the temperature in the kettle is adjusted to 25 ° C, and then a certain amount of activator (sodium metabisulfite) is added, and the polymerization is initiated by oxidation and reduction system. During the polymerization process, monomers were continuously added to maintain the polymerization pressure of 0.49 to 0.78 MPa. The dispersion obtained after the polymerization was diluted with water to a certain concentration, and the temperature was adjusted to 15 to 20 ° C. After being coagulated with mechanical stirring, it was washed with water and dried. This product is obtained as a fine granular resin.
PTFE can be formed by compression or extrusion; it can also be made into water dispersion for coating, impregnation or fiber. Polytetrafluoroethylene is widely used in high and low temperature resistant industries such as atomic energy, national defense, aerospace, electronics, electrical, chemical, machinery, instruments, meters, construction, textile, metal surface treatment, pharmaceutical, medical, textile, food, metallurgical and smelting industries. , Corrosion-resistant materials, insulation materials, anti-stick coatings, etc., making it an irreplaceable product.
PTFE has outstanding excellent comprehensive properties, high temperature resistance, corrosion resistance, non-stick, self-lubrication, excellent dielectric properties, and low coefficient of friction. Used as engineering plastics, can be made of PTFE pipes, rods, belts, plates, films, etc., generally used in corrosion-resistant pipes, containers, pumps, valves and radar, high-frequency communication equipment, radio equipment. Adding any filler that can withstand the sintering temperature of PTFE, the mechanical properties can be greatly improved, while maintaining other excellent properties of PTFE. Filled varieties include glass fiber, metal, metalized oxide, graphite, molybdenum disulfide, carbon fiber, polyimide, EKONOL, etc., the wear resistance and limit PV value can be increased by 1000 times.
The PTFE pipe is made of suspension polymerized PTFE resin and extruded by a plunger. In the known plastics PTFE has the best chemical resistance and dielectric properties. PTFE braided packing is a good dynamic sealing material is expanded polytetrafluoroethylene woven strip having a low coefficient of friction, wear resistance, chemical resistance, good sealing, not hydrolyzed, not harden excellent performance. For a variety of media work gasket seal and the lubricating material, and an electrically insulating member for use at various frequencies, the capacitor dielectric, wire insulation, electrical insulation and other instruments.
The mechanical properties of PTFE are relatively soft. Has very low surface energy. Polytetrafluoroethylene having a number of excellent performance:
Temperature: Long-term use temperature of 200 to 260 degrees;
Low temperature: -100 degrees is still soft when;
Corrosion resistance: ability aqua regia and all organic solvent;
Weatherability: plastic best aging life;
High Lubrication: having a minimum coefficient of friction (0.04) plastics;
Not sticky: solid material having a minimum surface tension without any adhesive substance;
Non-toxic: with physical inertia; excellent electrical properties, is an ideal insulation material C, the newspaper can be a barrier layer of a thickness of 1500V high voltage; also smoother than ice.
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