Tianjin Tiansu Binhai Fluorine Plastic Film

Date:2021/7/22 8:32:27 /Read: /Source:本站

Tianjin Tiansu Binhai Fluorine Plastic Film http://www.tjtsjt.net//

Polytetrafluoroethylene (F4, PTFE) has a series of excellent performance: high temperature resistance-long-term use temperature of 200~260 degrees, low temperature resistance-still soft at -100 degrees; corrosion resistance-resistance to aqua regia and all organic solvents; Weather resistance-the best aging life in plastics; high lubrication-with the smallest coefficient of friction (0.04) in plastics; non-stickiness-with the smallest surface tension in solid materials without adhesion of any substances; non-toxic-with physiological inertness; Excellent electrical properties, it is an ideal C-class insulating material. Polytetrafluoroethylene materials are widely used in important sectors such as national defense and military industry, nuclear energy, petroleum, radio, electrical machinery, and chemical industry. Products: PTFE rods, pipes, plates, turning plates. Polytetrafluoroethylene is a polymer of tetrafluoroethylene. The English abbreviation is PTFE. The structural formula is. It was discovered in the late 1930s and put into industrial production in the 1940s. Properties The relative molecular mass of PTFE is relatively large, the low is hundreds of thousands, the high is more than 10 million, and generally millions (the degree of polymerization is on the order of 104, while that of polyethylene is only 103). Generally, the crystallinity is 90~95%, and the melting temperature is 327~342℃. The CF2 units in the polytetrafluoroethylene molecule are arranged in a zigzag shape. Because the radius of the fluorine atom is slightly larger than that of hydrogen, the adjacent CF2 units cannot be completely cross-oriented in trans, but form a spiral twisted chain, almost covered by the fluorine atom The surface of the entire polymer chain. This molecular structure explains the various properties of polytetrafluoroethylene. When the temperature is lower than 19°C, a 13/6 helix is formed; at 19°C, a phase change occurs, and the molecules are slightly unwound to form a 15/7 helix. http://www.tjtsjt.net//

  Although the rupture of carbon-carbon bonds and carbon-fluorine bonds in perfluorocarbons requires energy absorption of 346.94 and 484.88kJ/mol, respectively, the depolymerization of polytetrafluoroethylene to produce 1 mol of tetrafluoroethylene only requires energy of 171.38kJ. Therefore, during high temperature cracking, polytetrafluoroethylene is mainly depolymerized into tetrafluoroethylene. The weight loss rate (%) of PTFE at 260, 370 and 420℃ is 1×10-4, 4×10-3 and 9×10-2 per hour, respectively. It can be seen that PTFE can be used for a long time at 260°C. As the highly toxic by-products such as fluorophosgene and perfluoroisobutylene are produced during high-temperature pyrolysis, special attention must be paid to safety protection and to prevent PTFE from contacting open flames. http://www.tjtsjt.net//

                             Taken from the Internet http://www.tjtsjt.net//

Editor:admin


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