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Corrosion resistance of PTFE

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Corrosion resistance of PTFE

  • Categories:Industry news
  • Author:PFA tube lady
  • Origin:PFA tube lady
  • Time of issue:2008-09-17 15:21
  • Views:

Corrosion resistance of PTFE

  • Categories:Industry news
  • Author:PFA tube lady
  • Origin:PFA tube lady
  • Time of issue:2008-09-17 15:21
  • Views:

  Polytetrafluoroethylene (Teflon, PTFE, F4, PTFE, Teflon, Teflon, Plastic King) is one of the fluoroplastics used for sealing, which has high corrosion resistance, high and low temperature resistance, and stable physical properties Features. Known as the "Plastic King". It is polymerized by tetrafluoroethylene by suspension method or dispersion method. It has excellent resistance to high and low temperature. It can be used for a long time in the range of -180~260℃. It is resistant to almost all chemicals and is extremely corrosive. The strong aqua regia does not change after boiling, and the friction coefficient is very low, only 0.04. PTFE does not absorb water and has excellent electrical properties. It is currently the solid insulating material with the smallest dielectric constant and dielectric loss. Its corrosion resistance even surpasses stainless steel, gold, platinum, ceramics, PTFE sealing ring, PTFE film, PTFE pipe products and other products, and it is widely praised in the market.

  

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Figure 1 PTFE image source: Internet

  Why is PTFE so resistant to corrosion?

  Let's take a look at its short structure: -[-CF2-CF2-]n-. The CF covalent bond determines its superiority in corrosion resistance. Some reactions such as oxidation and chlorination cannot cause damage to the CF covalent bond. Because the CC covalent bond is usually protected by the CF covalent bond, that is to say, other It is difficult for the atoms to get close to the electron cloud between the CC bonds and they are repelled by the electronegativity of the F atom. Therefore, PTFE does not follow most of the known strong chemical reagents, such as strong acids and bases, water and various organic solvents. Reaction, its corrosion resistance is self-evident.

  In addition, the relative molecular mass of polytetrafluoroethylene is relatively large, the low is hundreds of thousands, and the high is more than ten million, 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°C. 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 helical 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, which is also an important reason for the corrosion resistance of PTFE.

  The following is a reference table of PTFE corrosion performance:

  

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Figure 2 Reference table of corrosion resistance of PTFE (partial) Source: Miss Teflon tube

  With the advancement of science and technology, the development of traditional anti-corrosion equipment made of non-metallic materials has become more and more perfect, and new types of anti-corrosion non-metal materials are constantly emerging. In the wave of adopting new technologies and new materials to develop new anti-corrosion products, PTFE anti-corrosion products are thriving and develop rapidly. Polytetrafluoroethylene (PTFE for short) has a high degree of chemical stability. It can withstand almost all commonly used strong corrosive and oxidizing chemicals. It also has the characteristics of high temperature resistance, so it is an ideal anti-corrosion material. The application of PTFE anti-corrosion products in the industry has become more and more extensive. PTFE anti-corrosion products can replace a large number of alloy material products, increase the working capacity of equipment, and reduce downtime and maintenance. It is a kind of potential for development. Corrosion resistant products.

  Shenzhen DanKai Technology Co., Ltd. (ShenZhen DanKai Technology Co.,ltd.), whose predecessor was Dongguan Dandi Insulation Material Co., Ltd. Fluoroplastic Material Factory, which was established in 1998, specializes in FEP, PFA, PTFE and other fluoroplastic pipes. R&D, production and sales of rod, sheet and film products and other insulating materials. The company has a senior R&D team with international standards and a production line of fluorine plastic products imported from abroad. Some fluoroplastic products have passed ISO9001, SGS, FDA certification, and have been fully affirmed by domestic and foreign cooperative customers such as Huawei, Foxconn, Midea, ZTE, Intel, and AirTAC. The main products of the company are: ①Tubes: Ptfe tube, Fep tube, Pfa tube, Pvdf tube; ②Heat shrinkable tube: Ptfe heat shrinkable tube, Fep heat shrinkable tube, Pfa heat shrinkable tube, Pvdf heat shrinkable tube; ③Plate rod Membrane: Ptfe board and rod film, Fep board and rod film, Pfa board and rod film, Pvdf board and rod film; ④Insulation materials: silica gel, PE, PVC, UPE, etc.; ⑤Special category: PFA imported connector, spiral tube, spring tube , Rotary cut tube, welding rod, tee, straight-through, gasket, joint, taper rod, flared tube, sealing tube, braided tube, bellows, etc. At the same time, fluorine plastic products of various specifications can be customized and processed according to customer requirements.

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