PTFE insulation: the F atom in the PTFE molecule conceals the c-c bond and the c-f bond energy is highly stable, which is not corroded by any chemical except alkali metal and element fluorine. In PTFE molecule, F atom is symmetric, and in c-f molecule, two elements are covalently combined. There are no free electrons in the molecule, and all molecules are neutral. PTFE has excellent dielectric function. Because PTFE has no gram bond in its molecular structure, its crystallinity is very high.
The PTFE molecule has an inert fluorine-containing outer shell, which gives it a raised nonstick performance and a low friction coefficient. The volume resistance is up to 1018 ohm • cm, the dielectric consumption is small, and the breakdown voltage is high. High and low temperature resistance: it has little influence on temperature and wide temperature range. It can be used at -190~260℃. Self-smoothness: has the minimum friction coefficient in plastics, is the ideal oil - free smooth material.
External non-viscous: known solid data can not adhere to the surface, is a solid data with the minimum external energy. Resistance to atmospheric aging, radiation resistance and low permeability: exposed in the atmosphere for a long time, outside and function insist on stability. Non-flammability: oxygen limit index is below 90. Chemical decay and weather resistance: teflon is nearly impervious to all chemical agents except the molten alkali metals. For example, in concentrated sulfuric acid, nitric acid, hydrochloric acid, or even boiling in aqua regia, the component and function are unchanged, and almost insoluble in all solvents, only slightly soluble in alkanes (about 0.1g/100g) above 300℃. Ptfe does not absorb moisture, does not burn, is very stable to oxygen, ultraviolet radiation, so it has excellent weather resistance. Of course, in perfluorocarbon compounds, the necessary separation of the received energy of 346.94 kJ/mol and 484.88kJ/mol is necessary for the fracture of the carbon-carbon bond and the carbon-fluorine bond, but the energy required for the depolymerization of ptfe is 171.38kJ /mol. In order to crack at low temperature, ptfe is important to depolymerize as tetrafluoroethylene.
The weight loss velocity (%) of ptfe at 260 ℃, 370 ℃ and 420℃ was separated into 1×10-4, 4×10-3 and 9×10-2 per hour. It can be seen that ptfe can be used for a long time at 260℃. Due to the low temperature cracking also occurs highly toxic by-products such as fluorphosgene and perfluoroisobutene, to pay special attention to safety protection and avoid ptfe fighting flame.
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