PTFE bubble point membrane, also called polytetrafluoroethylene bubble point membrane, has excellent chemical stability, can withstand corrosion from strong acids and alkalis, and has a wide temperature tolerance.
Therefore, PTFE has great advantages compared with other filter materials.
But PTFE material is insoluble and will not flow even if it is heated to its decomposition temperature.
So the processing performance is very poor.
The current method for preparing PTFE filter membranes is the biaxial stretching method.
After the dry PTFE fine powder is fully mixed with additives, it enters the extruder. The powder is pushed and extruded into PTFE strips, which are then rolled into films under a rolling machine.
Then the additives are removed by heating to volatilize and biaxially stretched.
Due to the stretching effect, the PTFE fibril structure separates, forming a special node-crack tissue.
PTFE bubble point membrane is a polymer filter membrane with a pore size in the range of 0.1μm-10μm, which can intercept solid particles and colloidal particles in gas or liquid.
Foreign countries began to develop biaxially stretched PTFE membranes in the 1950s, while my country began to invest in research and development and production in the 1970s.
After multi-faceted development, PTFE membrane is now widely used in chemical, pharmaceutical, semiconductor, environmental protection, food, beverage and brewing industries.
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