If you want to invent a highly flexible, chemically res […]
If you want to invent a highly flexible, chemically resistant, heat resistant, non-sticky and resistant material, and have not yet finished, you will want to be able to come up with an almost as good material as PTFE sheet in these areas.
PTFE has a melting point of about 327 ℃, pure PTFE sheet is almost completely chemically inert and is very insoluble in most solvents or chemicals and is thermally stable enough to be used between -200 ° C and + 260 ° C without degradation.
Other useful PTFE sheet properties have high flexural strength even at low temperatures, high resistance and dielectric strength, water resistance (due to high electronegatability of fluorine) and low coefficient of friction. PTFE density is also high, 2200 kg / m3.
In fact, in addition to some chemical reagents and solvents (such as bismuth trifluoride, cobalt (III) fluoride, xenon fluoride or basic fluorine at high pressure and high temperature), the only factor in the use of PTFE is its right High energy radiation does not have good resistance, which will lead to the destruction of PTFE molecules.
In addition to pure PTFE, there are two copolymers and PTFE as effective, but with some different properties.
PFA or perfluoroalkoxy has very similar properties to PTFE because it has very chemical resistance, flexibility and thermal stability (continuous use up to 260 degrees Celsius), but PTFE has a certain creep tendency, PFA has resistance Creep, melt processing, injection molding, extrusion, compression molding, blow molding and transfer molding.
TFM, known as PTFE-TFM, is a polytetrafluoroethylene with perfluoropropyl vinyl ether as an additional modifier, resulting in a more dense material with better corrosion resistance, such as PFA creep resistance and weldable.