What are the main preparation methods of ptfe industrial filtration membrane?

There are two main methods for preparing ptfe industrial filtration membranes.

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.

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