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What is the production method of poly chlorotrifluoroethylene
Polychlorotrifluoroethylene is a thermoplastic fluoroplastic developed and produced. the first report on its preparation was published by a French company in 1937. later, in the course of the Manhattan Project, the United States did a lot of research work on its preparation process route and product properties. it was put into production by 3M in 1942 and marketed under the Kel-F trademark. in 1959, China started to develop PCTFE resin. in 1960, the test was successful. The tests were successful. 1966 saw the completion of a production plant with an annual capacity of 25 tonnes of PCTFE resin.
Polychlorotrifluoroethylene is a homopolymer of vinyl chloride trifluoride, which is structured with fluorine and chlorine atoms around the main carbon chain.
The general formula for the chemical structure of poly(chlorotrifluoroethylene) is as follows:
The F atom in the molecular structure of PCT gives the polymer its chemical inertness, while the CI atom gives the polymer its transparency, thermoplasticity and hardness. Thus, pcife is a high-quality thermoplastic resin with high stability, heat resistance, non-flammability, non-hygroscopicity, permeability and inertness. Due to the presence of C-CI bonds in the molecular structure of PCTFE, PCTFE has better hardness, stiffness, creep resistance, permeability, melting point and melt viscosity than PTFE and polytetrafluoroethylene hexafluoropropylene (FEP), but slightly less heat resistance and chemical inertness than PTFE and FEP.
With a melting temperature of 213°C, PCTFE has excellent chemical stability, insulation and weather resistance and can be used for long periods at -196-125°C. The mechanical strength and hardness are better than that of PTFE, and the film has better transparency and lower permeability. PCTFE is a crystalline polymer with a melting point of 218.33°C and a density of 2.13 g/cm3 (g/cm3) .
PCTFE is the product of the radical-initiated polymerisation of vinyl chloride trifluoride with a linear backbone of repeating CF(CL)-CF units.
PCTFE is inert to most reactive chemicals at room temperature, but is soluble in a few solvents above 212 t. It is also soluble in some solvents, particularly chlorinated solvents. PCTFE has a good gas barrier and its moisture permeability is the lower of all transparent plastic films. Its electrical properties are similar to those of other perfluoropolymers, but the dielectric constant and loss factor are slightly higher, especially at high frequencies. pcTFE can be made in thick (1/8") optically transparent parts.
Polychlorotrifluoroethylene is mainly prepared by suspension polymerisation, emulsion polymerisation and other methods.
This method is used to prepare high molecular weight polyvinylidene trifluoride. Water, initiator ammonium persulphate, reducing agent sodium metabisulphite and pH buffer are added to the polymerisation kettle, and then vinyl trifluoride is added for suspension polymerisation.
100 parts of vinyl trifluoride, 30 parts of water, 2.4 parts of initiator 2 potassium persulphate, 2.4 parts of emulsifier perfluorooctanoic acid, adjusted to pH 7, polymerised at 30°C for 20h to obtain a stable polyvinyl fluoride-vinyl chloride emulsion with a particle size of 0.1um. The main manufacturer in China is Shanghai Shuguang Chemical Factory.
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