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According to the list of carcinogens of the International Agency for Research on Cancer of the World Health Organization, polytetrafluoroethylene is classified as three types of carcinogens, that is, it is not clear about its carcinogenic effects on humans.
Property data editing
1. Properties: There are three types of granular, powder and dispersion. It is transparent when it is neutral, and the thickness increases to become off-white
2. Density (g/mL, 25ºC): 2.1~2.3
3. Relative vapor density (g/mL, air=1): not determined
4. Melting point (ºC): 327
5. Boiling point (ºC, normal pressure): 400
6. Boiling point (ºC, 5.2kPa): not determined
7. Refractive index: 1.37 (20ºC)
8. Solubility: insoluble in any solvent
Nature and stabilityedit
1. Stable under normal temperature and pressure, avoid humidity, heat and high temperature
There is no real melting point, and it decomposes slowly above 450℃ and becomes a gas directly. At 327°C, the mechanical strength suddenly disappeared. Insoluble in any solvents. In addition to reacting with molten alkali metals, it is not corroded by any substance, even if it is boiled in hydrofluoric acid, aqua regia or fuming sulfuric acid, sodium hydroxide, it will not change.
2. White, odorless, tasteless, non-toxic powder, commonly known as "Plastic King". It has excellent chemical stability, corrosion resistance, airtightness, high lubrication and non-stickiness, electrical insulation and good anti-aging resistance. High temperature resistance, the working temperature can reach 250℃. It is resistant to low temperature and has good mechanical toughness at low temperature. Even if the temperature drops to -196℃, it can maintain 5% elongation. Corrosion resistant, inert to most chemicals and solvents, resistant to strong acids and alkalis, water and various organic solvents. Good weather resistance and the best aging life among plastics. High lubrication is the lowest friction coefficient among solid materials. Non-sticking is the one with the smallest surface tension among solid materials and does not stick to any substance. It is non-toxic, physiologically inert, and has no adverse reactions as artificial blood vessels and organs implanted in the body for a long time.
Synthesis methodedit
Industrial production adopts suspension polymerization or emulsion polymerization.
1. Preparation of monomer tetrafluoroethylene
Industrially, trichloromethane is used as raw material, and trichloromethane is fluorinated with anhydrous hydrofluoric acid. The reaction temperature is above 65ºC. Antimony pentachloride is used as a catalyst. Finally, tetrafluoroethylene is made by thermal cracking. Zinc can also be used with tetrafluorodichloroethane at high temperature to produce tetrafluoroethylene.
2. Preparation of polytetrafluoroethylene
In an enamel or stainless steel polymerization kettle, use water as the medium, potassium persulfate as the initiator, perfluorocarboxylic ammonium salt as the dispersant, fluorocarbon as the stabilizer, and tetrafluoroethylene through redox polymerization to produce polytetrafluoroethylene Vinyl.
Add various additives into the reaction kettle, the tetrafluoroethylene monomer enters the polymerization kettle in the gas phase, adjust the temperature in the kettle to 25°C, and then add a certain amount of activator (sodium bisulfite) to initiate polymerization through an oxidation-reduction system. Continuously add monomers during the polymerization process and keep the polymerization pressure 0.49~0.78MPa. The dispersion obtained after polymerization is diluted with water to a certain concentration, and the temperature is adjusted to 15~20ºC. After condensing with mechanical stirring, it is washed and dried with water. This product is a fine granular resin.
Ecological data editing
This substance may be harmful to the environment, so special attention should be paid to water bodies.
Ms. Yoki
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