Application Of Polytetrafluoroethylene Sheet In Blockage Of Coal Bunker
The blockage of coal bunker is a big problem in the production of coal enterprises. It is one of the effective ways for coal mine to effectively prevent the blockage of coal bunker with proper technical measures. Although a variety of comprehensive anti-blocking measures are adopted in a mine, its application effect is not particularly ideal.
Teflon plate is tetrafluoroethylene polymers, abbreviations for PTFE, its relative molecular mass is bigger, for hundreds of thousands of low, high of more than ten million, generally for millions, PTFE molecule CF2 unit in terms of the sawtooth shape due to hydrogen fluorine atom radius is larger, so the adjacent CF2 unit can't completely according to trans fork orientation, it forms a spiral twisted chains, fluorine atoms almost covers the entire surface of the polymer chain. This molecule results in a variety of special properties for ptfe.
1. Self-lubrication: the minimum friction coefficient in plastic is 0.04. This is an important feature of the whole fluorocarbon surface, and is ideal for oil-free lubrication.
2. The surface is not sticky: because the fluorine - carbon chain intermolecular force is extremely low, ptfe has no property. The known solid materials cannot adhere to the surface, which is a solid material with minimal surface energy.
3. Insulation: ptfe sheet is not affected by environment and frequency, volume resistance of up to 1018 Ω cm, small dielectric loss, high breakdown voltage.
4. High and low temperature resistance: the influence of temperature has little change, and the temperature range is wide, and the temperature can be used in the range of 190~260.
5. Atmospheric aging resistance: the teflon board has strong radiation resistance and low permeability, and has been exposed to the atmosphere for a long time, while the surface and performance remain unchanged.
6. Chemical resistance and weatherability: ptfe is almost free of any chemical reagent corrosion except for molten alkali. Such as sulfuric acid, nitric acid, hydrochloric acid, and even boil in aqua regia, its weight and performance are no change, almost insoluble in all solvents, is only slightly soluble in all paraffin at above 300 ℃. Polytetrafluoroethylene sheet does not absorb moisture, otherwise, the oxygen, ultraviolet ray is extremely stable, therefore has excellent weatherability.
Teflon plate used in coal bunker lining plate, its good mechanical properties make it hard for coal to stick on the inner wall of the coal formation plugging storehouse, the service life is long, construction is convenient, don't do too much changes in construction of coal itself. Coal mine since the teflon plate used for bottom lining, construction during daily coal increased significantly, and there have been no coal bunker blockage accident, directly reduce the mineral sheers in a bunker jam for the economic loss brought by the production processing, has brought remarkable economic benefits for coal mine production.