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The development process of polytetrafluoroethylene


The father of fluorine resin, Roy Plunkett, started to study the substitution of Freon in DuPont in 1936. They collected some of the tetrafluoroethylene and stored it in a cylinder to prepare for the next experiment the next day, but when they opened the pressure reducing valve of the cylinder the next day, there was no gas overflow. thought it was a gas leak, but when the cylinder was weighed, they found that the cylinder did not lose weight. They sawed open the cylinder and found a large amount of white powder, which was polytetrafluoroethylene.

Research found excellent properties, can be used for atomic bombs, artillery shells and other anti-melt sealing gaskets, so the U.S. military kept the technology secret during World War II. It was not until the end of World War II that the technology was declassified and industrial production of PTFE was realized in 1946.

Chinese trade name "Teflon" (teflon), "Teflon", "Teflon", "Teflon "etc. It is a polymer compound made of tetrafluoroethylene by polymerization, its structural short formula is, has excellent chemical stability, corrosion resistance, is one of the world's best materials in corrosion resistance today, except for molten alkali metals, chlorine trifluoride, chlorine pentafluoride and liquid fluorine, can resist all other chemicals, boiling in aqua regia does not change, widely used in a variety of occasions requiring resistance to acids and bases and organic solvents. It has sealing, high lubrication and non-stick, electrical insulation and good anti-aging ability, excellent temperature resistance (can work under the temperature from positive 250℃ to negative 180℃ for a long time). Polytetrafluoroethylene itself is not toxic to people. Use temperature -190~250℃, allow sudden cold and hot, or alternate hot and cold operation. Pressure -0.1~6.4Mpa.

Its creation has solved many problems in chemical, petroleum, pharmaceutical and other fields. Teflon seals, gaskets, gaskets. Teflon seals, gaskets and sealing washers are made of suspended polymerized Teflon resin. PTFE is chemically resistant compared to other plastics, and it has been widely used as a sealing and filling material. The dispersion can be used as insulating impregnating solution for various materials and anti-corrosion coating for metal, glass, pottery surface, etc. Various PTFE rings, PTFE gaskets, PTFE packing, etc. are widely used for flange sealing of various anti-corrosion pipes. In addition, it can also be used for drawing silk, PTFE fiber - fluorine spandex (foreign trade name Teflon).

Nowadays, all kinds of plastic king products have played a pivotal role in the field of national economy such as chemical industry, machinery, electronics, electrical appliances, military industry, aerospace, environmental protection and bridges. PTFE use conditions industry chemical, petrochemical, oil refining, chlor-alkali, acid, phosphate fertilizer, pharmaceutical, pesticide, chemical fiber, dyeing, coking, gas, organic synthesis, non-ferrous smelting, steel, atomic energy and polymer filter materials, high-purity products production (such as ion membrane electrolysis), viscous material conveying and operation, food, beverage and other processing and production sectors with highly stringent health requirements.

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