Polytetrafluoroethylene, referred to as PTFE, is a perfluorinated polymer obtained by polymerizing the monomer tetrafluoroethylene.
It has many derivative products, among which PTFE base tape film is a fluorocarbon chemical with excellent chemical resistance and high and low temperature resistance.
PTFE short fibers can be used to make needle-punched felt for filtration; PTFE woven yarn can be used to make the base scrim of needle-punched felt. Because of its long service life, it can not only be used as PTFE The base cloth of vinyl felt can also be used as the base cloth of felts made of other types of high-performance fibers; polytetrafluoroethylene sewing thread can be used in the manufacture of various types of filters.
In 1976, R.W. Gore disclosed for the first time the manufacturing process of a PTFE porous membrane with the trade name Groce-TexR.
Mix powdered polytetrafluoroethylene and lubricant into a paste, and extrude it into a sheet. After expelling the high temperature of the lubricant (lower than the crystal melting point), perform uniaxial or biaxial stretching. The length is more than the original.
The nominal pore diameter that is more than 50 times the film length is 0.02μm~10μm, and the thickness is 25μm~76μm.
Since 1977, this research has led to the publication of multiple patents.
Many studies have been conducted on porous PTFE base tape membranes, increasing porosity, reducing pore size and reducing pressure loss.
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