PTFE membrane filter material is composed of a microporous, extremely smooth and hydrophobic PTFE microporous membrane and different substrates (such as needle felt or woven fabrics). types of filter materials.
Selection of materials: 1. Good mechanical properties; 2. Low price and easy to purchase; 3. High porosity and low filtration resistance, which will not cause too much filtration resistance to the composite filter material; 4. Scope of application It is equivalent to the requirements of the actual industrial system, that is, it can withstand normal temperature, medium temperature, and high temperature respectively, and the requirements for chemical stability such as pH must also be adapted to the actual system;? For films with different structures, the gas transmission and diffusion modes through the film are different. , the transmission mechanisms are also different.
There are two mechanisms for gas permeation through polytetrafluoroethylene microporous membranes: 1. It is the dissolution and diffusion mechanism through the non-porous membrane; 2. It is the micropore diffusion mechanism through the porous membrane. The gas transfer mechanism in porous media includes Sen diffusion, viscous flow, surface diffusion flow, molecular sieving, capillary condensation, etc.
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