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PTFE membrane is a microporous membrane produced by premixing, extruding, calendering, biaxial stretching and other special processes using polytetrafluoroethylene dispersed resin. It is divided into clothing membrane, Pu micro waterproof membrane, filtration membrane, and purification membrane.
PTFE film is a microporous film made of polytetrafluoroethylene as raw material, using a special process, calendering, extrusion, biaxial stretching and other methods. PTFE membranes can be divided into clothing membranes, air filtration membranes, and air purification membranes according to their uses. The PTFE membrane has a fibril-like microporous structure with a porosity of over 85%, 1.4 billion micropores per square centimeter, and a pore size range of 0.02μm-15μm.
The main structure of PTFE membrane
1. The surface morphology of the PTFE microporous film is a spider web-like microporous structure. Pores are formed between the microfibers, and the arrangement direction of the microfibers is basically parallel to the stretching direction; the junction of the fiber bundle is the node, which is formed by many microfibers entangled and connected.
2. PTFE membrane is an asymmetric membrane, and the micropore size of the front and back of the membrane is different.
3. The cross-sectional micropore size of the membrane is larger than the surface micropore size, and the vertical and horizontal micropore sizes are also different, and the longitudinal micropores are larger than the horizontal.
4. The cross-section of the membrane is a network structure. There are very complicated changes in the three-dimensional structure of the hole, such as network connection, hole inserting, and hole bending. There may be multiple micropores forming a channel, or a micropore may be Multiple channels are connected.