Polytetrafluoroethylene (Poly tetra fluoroethylene), abbreviated as PTFE, commonly known as “Plastic King”, brand name Teflon, in China, due to the pronunciation, the trademark “Teflon” is also called Teflon, Teflon Dragon, Teflon, Teflon, Teflon, etc., are all transliterations of Teflon.

Polytetrafluoroethylene is known as the “Plastic King.” Roy Plankert, the father of fluororesin, began to study freon substitutes at DuPont in the United States in 1936. They collected part of tetrafluoroethylene and stored it in steel cylinders to prepare for the second Tian proceeded to the next experiment, but when the cylinder pressure reducing valve was opened the next day, no gas escaped. They thought it was a gas leak, but when the cylinder was weighed, they found that the cylinder did not lose weight. They saw open the cylinder and found a large amount of white powder, which was polytetrafluoroethylene.

They found that PTFE has excellent properties and can be used for anti-fusion sealing gaskets for atomic bombs and artillery shells. Therefore, the US military kept this technology secret during World War II. It was not decrypted until the end of World War II, and the industrial production of polytetrafluoroethylene was realized in 1946.

1. Product name: PTFE

2. English name: Polytetrafluoroethylene

3. Alias
PTFE; Teflon; Teflon; teflon; Teflon; F4; the king of plastics; Teflon (Japanese) [English abbreviation is PTFE, brand name Teflon, Chinese translation is different: Mainland China is translated into Teflon, Hong Kong translation Teflon, translated as Teflon in Taiwan】

4. Molecular formula: [CF2CF2]n

5. production methods
PTFE, it is generated by free radical polymerization of tetrafluoroethylene. Industrial polymerization is carried out under stirring in the presence of a large amount of water to disperse the heat of reaction and facilitate temperature control. The 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 initiation system can be used. 171.38kJ of heat is released during polymerization of tetrafluoroethylene per mole. Dispersion polymerization must add perfluorinated surfactants, such as perfluorooctanoic acid or its salts.

6. use
Polytetrafluoroethylene [PTFE, F4] is one of the best corrosion-resistant materials in the world today, so it has the reputation of “Plastic King”. It can be used in any kind of chemical medium for a long time, and its production has solved many problems in my country’s chemical, petroleum, pharmaceutical and other fields. Polytetrafluoroethylene seals, gaskets, gaskets. Polytetrafluoroethylene seals, gaskets, and gaskets are made of suspension polymerized polytetrafluoroethylene resin molding. Compared with other plastics, PTFE has the characteristics of excellent chemical resistance and temperature resistance. It has been widely used as a sealing material and filling material. It has a high degree of chemical stability and excellent chemical resistance, such as strong acid, strong alkali, strong oxidant, etc., has outstanding heat resistance, cold resistance and abrasion resistance. The long-term use temperature range is -200-+250°C. It has excellent electrical insulation and is not affected by temperature and frequency. In addition, it has the characteristics of non-sticking, non-absorbent, non-burning, etc. Suspension resin is generally molded and processed by molding and sintering. The resulting rods, plates or other profiles can be further processed by machining methods such as car planing, drilling, and milling. The rod can be made into oriented film after turning and drawing.