PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Corrosion resistance of PTFE
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
PFA tube little sister
Release time:
2008-09-17
Visits:
Polytetrafluoroethylene (Teflon, PTFE, F4, Teflon, Teflon, Teflon, plastic king) is one of the fluorine plastics used for sealing. It has high corrosion resistance, high and low temperature resistance, and stable physical properties. Known as the "plastic king" reputation. It is composed of tetrafluoroethylene by suspension method or dispersion method polymerization, has a very good resistance to high and low temperature performance, can be in the range of -180~260 ℃ long-term use, almost all the chemicals, in the erosion of strong aqua regia boiling also can not change, the coefficient of friction is very low, only 0.04. PTFE does not absorb water, excellent electrical properties, is the current dielectric constant and dielectric loss of the smallest solid insulation materials. Its corrosion resistance even exceeds stainless steel, gold, platinum, ceramics, PTFE sealing ring, PTFE film, PTFE pipe products and other products, widely praised in the market.
Figure 1 PTFE map source: network
Why is the corrosion resistance of PTFE so good?
Let's look at its structure in brief:-[-CF2-CF2-]n-. C- F covalent bond determines its superiority in corrosion resistance. Some reactions such as oxidation and chlorination cannot bring damage to C- F covalent bond. Since C- C covalent bond is usually protected by C- F covalent bond, that is to say, the electron cloud between other atoms that is difficult to access C- C bonds is repelled by the electronegativity of F atoms. Therefore, polytetrafluoroethylene does not react with most known strong chemical reagents, strong acids, strong bases, water and various organic solvents, its corrosion resistance is self-evident.
In addition, the relative molecular mass of polytetrafluoroethylene is relatively large, ranging from hundreds of thousands to tens of millions (the degree of polymerization is on the order of 104, while polyethylene is only on the 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 sawtooth shape. Since the radius of the fluorine atom is slightly larger than that of the hydrogen, the adjacent CF2 units cannot be completely oriented in a trans-cross direction, but form a spiral twisted chain. The fluorine atoms almost cover the surface of the entire polymer chain. This molecular structure explains the various properties of polytetrafluoroethylene. When the temperature is lower than 19 ℃, a 13/6 helix is formed; a phase transition occurs at 19 ℃, and the molecules are slightly unwound to form a 15/7 helix, which is also an important reason why PTFE has corrosion resistance.
The following is the reference table of PTFE corrosion performance:
Figure 2 Reference Table of Corrosion Resistance of PTFE (Part) Source: Teflon Tube Sister
With the progress of science and technology, the development of anti-corrosion equipment made of traditional corrosion-resistant non-metallic materials is becoming more and more perfect, and new corrosion-resistant non-metallic materials are constantly emerging. In the wave of using new technologies and new materials to develop new anti-corrosion products, PTFE anti-corrosion products are thriving and developing rapidly. Polytetrafluoroethylene (PTFE) has a high degree of chemical stability, he can withstand almost all commonly used strong corrosion, hydrogen oxidizing chemicals, but also has the characteristics of high temperature resistance, so it is an ideal anti-corrosion material. The application of PTFE anti-corrosion products in industry is more and more extensive. PTFE anti-corrosion products can replace a large number of alloy materials, increase the working capacity of equipment and reduce downtime maintenance. It is a kind of corrosion-resistant products with great development potential.
Shenzhen Dankai Technology Co., Ltd. (ShenZhen DanKai Technology Co., Ltd.), whose predecessor was the Fluoroplastic Material Factory of Dongguan Dandi Insulation Material Co., Ltd. established in 1998, specializes in the research and development, production and sales of FEP, PFA, PTFE and other fluoroplastic tube rod sheet membrane products and other insulation materials. The company has international standards of senior R & D team and the introduction of foreign fluorine plastic products production line. Some fluoroplastic products through ISO9001, SGS, FDA certification, Huawei, Foxconn, the United States, ZTE, Intel, AirTAC and other domestic and foreign cooperation customers fully affirmed. The company's main products are: ① pipes: Ptfe pipes, Fep pipes, Pfa pipes, Pvdf pipes; ② Heat shrinkable tubes: Ptfe heat shrinkable tubes, Fep heat shrinkable tubes, Pfa heat shrinkable tubes, Pvdf heat shrinkable tubes; ③ Plate rod film: Ptfe plate rod film, Feep plate rod film, Pfa plate rod film, Pvdf plate rod film, etc. PE: PE, special, spiral tube, spring tube, rotary cutting tube, welding rod, tee, straight, gasket, joint, cone rod, flared tube, sealing tube, braided tube, corrugated tube, etc. At the same time can be customized according to customer requirements processing production of various specifications of fluorine plastic products.
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