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Tetrafluoride shaft sleeve PTFE mechanical automation wear-resistant T-type tetrafluoride bushing
PVC is today * corrosion resistance good material-one, so the plastic king " reputation it can be used in any kind of chemical medium, in atomic aerospace, electronics, gas, chemical, machinery, instruments, instruments, construction, textile, metal surface treatment, textile, food, metallurgy and smelting industry widely used as high and low temperature resistance, corrosion resistance materials, insulation materials, anti-adhesive coating, etc., make it irreplaceable products.
Insulation: Volume resistance up to 1018 ohms?Centimeter, small medium loss, high breakdown voltage.
High and low temperature resistance: the impact on temperature is not change, temperature range is wide, can use temperature 190 260C.Self-lubrication: with the friction coefficient in plastic, is the ideal oil-free lubrication material.Surface non-viscosity: the known solid material can not adhere to the surface, is-a surface energy solid material.Atmospheric aging resistance, irradiation resistance and low permeability: long-term exposure to the atmosphere, the surface and performance remain unchanged.
Noncombustible: oxygen limiting index below 90 chemical corrosion resistance and weather resistance: except for molten alkali metal, PTFE is almost not any chemical corrosion.For example, in hydrochloric acid, even boiled in royal water, its weight and performance are not change, and almost insoluble in all solvents, only slightly soluble in 300C above the total alkane (about 0.1g / 100g).
The PTFE tetraspheres have the following properties:
(1) Chemical resistance, "C-F" bond has extremely high bond energy, is not easy to be taken apart, PTFE macromolecular stacking density is large, making it difficult for various reagents to penetrate through it.The substitution of the fluorine atoms causes the PTFE to form a helix
Structure, this inert helical perfluorinated "shell", combined with the non-polar and crystalline structure of the polymer, makes the PTFE has excellent chemical resistance.The more fluorine atoms in the molecule, the more Bodhi this property becomes
Known the "plastic king".It can withstand all kinds of acids and bases, even when heating is the same, but also can withstand alcohol, ketones, etc., only in fluorinated hydrocarbons, chemical reaction with liquid soda ash, or in the extreme pressure
Chemical erosion by elemental fluoride at high temperatures.
(2) PTFE tetrafluoroheres have heat resistance. Because fluorine atoms replace hydrogen atoms, the molecular internal spin activation energy increases, so the melting entropy of PTFE is much smaller than that of polyethylene, so its melting point is higher than that of polyethylene
More, up to 327°C.-Generally, FTFE can withstand the high temperature of 280°C and reach up to 300°C in a short time.These properties indicate that it is an ideal material for filtering in harsh environments.
(3) PTFE tetrafluoroheres withstand low temperatures and have good mechanical toughness to maintain 5% elongation even if the temperature drops to one-196°C.
(4) PTFE tetrafluoroheres flame retardant, in chemical environment and high temperature flame extension is very harsh.PTFE has good performance in this respect because its extreme oxygen index (LOI) is up to 95%,
That means it needs 95% oxygen to ignite and maintain the flame.
(5) PTFE tetrafluoroheres are resistant to atmospheric aging. PTFE is 100% stable to ultraviolet light and will not age, and has no obvious change in mechanical performance after 15 years of outdoor exposure.
(6) Low friction and the performance of the released dust particles, in all solid materials, PTFE has * low friction coefficient, its dynamic friction coefficient is 0.16, static friction coefficient is 0.2, the two are similar,
Good self-lubrication makes it an ideal material to release dust pollutants for filters and for many other industrial purposes.
(7) Water-resistant and water-resistant, PTFE does not absorb water, and it is easy to wash, so strong detergent can be used at high temperature.Its surface resists water, dust and other pollutants, so it is also an antifouling material
material.
