teflon It has been widely used as sealing material and filling material. As a rubber product, it can be made into PTFE pipe , rod, strip, plate, plastic film, etc. It is also used for corrosion resistant pipelines, vessels, pumps, valves, radar detection, high-frequency communication items, wireless communication items, etc. with high functional requirements. The fire evacuation fluid can be used as the insulation layer pre immersion solution of various materials and the anti-corrosion coating of metal materials, laminated glass, ceramic surface, etc. Various PTFE rings, PTFE gaskets, PTFE packing, etc. are widely used for sealing of various anti-corrosion pipeline flanges. Others can also be used for scraping, polytetrafluoroethylene chemical fiber - fluorine fiber (foreign products are called Teflon).
1. Various teflon Manufactured products have had a crucial impact in the socio-economic areas such as chemical plants, equipment, electronic devices, household appliances, weapons industry, aerospace, environmental protection, roads and bridges. Prerequisites for the application of polytetrafluoroethylene (PTFE): chemical plants, petrochemical industry, oil refineries, chlor alkali chemical industry, acid making, phosphorus and potassium fertilizer, pharmaceutical industry, chemical fertilizers, chemical fibers, dyeing and chemical, coking plants, liquefied gas, inorganic matter generation, nonferrous plate smelters, steel, nuclear energy and high-purity material production (such as ion exchange resin electrolysis), transportation and control of thinner raw materials, Part of the production, processing and production of food materials and drinks with strict requirements for environmental sanitation.
2. Application advantages: heat resistance - the application temperature reaches 250 ℃. Heat resistance - excellent equipment ductility; Even if the temperature is reduced to - 196 ℃, the elongation of 5% can be maintained. Corrosion resistance - for most chemicals and organic solvents, it mainly shows plasticity, ability, strong oxidant, water and various inorganic organic solvents. Weather resistance - good service life of embrittlement can be predicted with plastic. High smoothness is the one with low friction resistance predicted by solid materials. No adhesion - it means that the solid materials do not adhere to all material supplies due to the small interfacial tension. No damage - it has the plasticity of psychological state, and has been embedded into the body for a long time as an artificial blood vessel and organ without poor response.
three teflon It must have a large molecular weight, ranging from hundreds of thousands of low molecular weight to tens of millions of high molecular weight (the glass transition temperature is 104, while the high pressure polyethylene is only 103). As usual, the grain size is 90~95%, and the melting temperature is 327~342 ℃.
4. The low water absorption capacity of polytetrafluoroethylene and excellent weathering layer characteristics are actually recommended: polytetrafluoroethylene is a polymer of tetrafluoroethylene. The English abbreviation is PTFE. The product is called Teflon. It is known as "the first of plastics".? Polytetrafluoroethylene is widely used in all kinds of necessary strong acid and alkali resistance and inorganic organic solvents. Is it good for people? Toxic and side effects, but PFOA, one of the materials used in the whole production process, is believed to have carcinogenic effects.?
5. The molecular weight of polytetrafluoroethylene must be very large, ranging from hundreds of thousands of low molecular weight to tens of millions of high molecular weight (the glass transition temperature is 104, while that of high-pressure polyethylene is only 103). As usual, the grain size is 90~95%, and the melting temperature is 327~342 ℃.
six teflon CF2 enterprises in the molecule are listed according to the zigzag design. Since the semi longitude of the fluorine atom is slightly larger than that of hydrogen, the neighboring CF2 enterprises cannot follow the trans cross trend in detail, but form a spiral twisted chain, and the fluorine atom almost covers the outside of the polymer chain of all staff.
7. This reasonable molecular layout shows various functions of PTFE. When the temperature is less than 19 ℃, 13/6 spiral type is formed; Change at 19 ℃,? physical property:? The reasonable organic chemical layout of polytetrafluoroethylene is to replace the hydrogen atom of all personnel in high-pressure polyethylene with fluorine atom. The molecules were slightly relieved, forming a 15/7 spiral.
