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Introduction to vinyl trifluoride
(1) Structure of vinyl chloride trifluoride
Vinyl trifluoride, also known as fluoroplastic-3, abbreviated PCTFE or F3, is a homopolymer of the monomer vinyl trifluoride.
It is produced by propriety polymerization, suspension polymerization, solution polymerization and emulsion polymerization.
(2) History of the development of vinyl trifluoride
Vinyl trifluoride was invented in Germany in 1934, but the properties of the resin obtained at that time were far from those of existing resins. It was not until 1946 that a polymer of polyvinylidene trifluoride was obtained, which has excellent properties and is easy to mould.
In 1966, we started to develop and produce vinyl chloride trifluoride, which is now in mass production.
(3) Properties of vinyl trifluoride
Colourless, etheric-smelling gas, decomposes in water and polymerises easily. Boiling point -28.36°C. Melting point -168.11°C. Relative density of liquid 1.35. Relative density of liquid 1.35. Critical temperature 105.8°C. Critical pressure 4.063 MPa. air
Density of trifluorochloroethylene is 2.07~2.18g/cm3, crystal melting point 215℃, glass transition temperature 58℃, long-term use temperature -200~200℃. China Plastics Online Plastics Encyclopedia
Identification characteristics of vinyl chloride trifluoride: milky white, transparent or translucent. Compared with PTFE, it has similar specific gravity, high hardness, high friction coefficient, slightly worse heat and corrosion resistance at high temperatures, but better resistance to cold flow.
Vinyl trifluoride is a medium mechanical strength and elastic plastic with particularly good penetration of visible UV, IR and gas barrier properties. It also has good dielectric strength and is second only to 4 in chemical resistance.
(4) Uses of vinyl trifluoride
Vinyl trifluoride is a monomer that can be used to make important products such as fluoroplastics, fluoroelastomers and fluorochlorinated lubricants. It is also used as a raw material for the production of inhalation anaesthetics. It is used as a preservative by replacing the hydroxyl group in steroids and carbohydrates with fluorine.
Vinyl trifluoride can be made into rods, tubes, insulated wires and films by moulding, injection moulding, extrusion and coating. It can also be made into dispersions and used in impregnation and spraying processes. It can be used as gaskets, valve seats, oil seals, bushing materials, etc. In the electrical industry, it can be made into insulating materials, cable assembly lines, printed circuit boards, coil cores, etc. It can also be used in the chemical industry, medicine and hygiene, food and packaging. It is easily oxidized in the air and decomposed into phosgene. The oral LD50 for rats is 268 mg/kg and the 24-hour inhalation LC is 1000 x 10-6. It has significant effects on the human cardiovascular and nervous systems. Symptoms of poisoning are headache, nausea and vomiting. In severe cases, kidney damage and jaundice may occur. If symptoms of poisoning are detected, they should be treated promptly. The concentration in air is 2 x 10-6. The work site should be strictly well ventilated and the operator should wear protective equipment.
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