The Teflon air filter membrane produced and developed by Suzhou Company has excellent high temperature resistance, high temperature resistance, low temperature resistance, alkali resistance, anti-aging, anti-oxidation, electrically insulated wire, hydrophobicity, non-toxic, high lubrication, and non-toxic Adhesion, weather resistance, chemical resistance and many other features.
Therefore it is widely used in air filtration, chemical industry and many other fields.
It is well known that Teflon (polytetrafluoroethylene, ptfe) has excellent chemical corrosion resistance, high and low temperature resistance, aging resistance, low friction, dielectric properties, non-stickiness, and physiological inertness, making it widely used in chemical industry, Special materials have become indispensable in many fields such as machinery, electrical, construction, and medical care. They can create new processes and technical equipment by replacing traditional materials in the past, which can not only improve work efficiency but also extend service life. Its importance has been recognized by the world. focus on.
There are two main methods for preparing Teflon air filtration membranes that have been reported so far.
One is to add the pore-forming agent NaCl to ptfe, then make the ptfe into a film, and then remove the NaCl by heating and washing with water. The vacancies left by the NaCl form pores. The microporous film made by this method has the smallest pore size. is 0.1μm.
The second is the mechanical stretching method. The microporous film made by the modified method has a special structure of island-like “knots” connected by microfibers. It is currently the main method for preparing PTFE microporous films.
Teflon air filter membrane is made by mechanical stretching method. The specific process is to fully mix the dry PTFE fine powder with additives and then enter the extruder. The powder is pushed and extruded into strips of PTFE. As shown in Figure 1, it is then rolled into a membrane sheet under a rolling machine. After heating to volatilize the additives, it can be stretched vertically and horizontally, and then through heat treatment, shaping, cutting and winding to obtain a biaxially stretched microfiltration membrane.
</p
