Abstract:

The application, microporestructure, key controlling techniques and development of PTFE (Polytetrafluoroethylene) filtration membrane are introduced.The development direction of PTFE filtration membrane to precisecontrolling,the application in fresh air system andmembranedistillation is pointed out. The pore size controlling techniques including membrane preparation parameter adjustment, co-stretching composite double-layered membrane,post finishing, and membrane wrapping have the technology superiority. The hydrophilic modificationmethod through pose finishing of hydrophilic substances containinghydrophilic groups, such as carboxyl, hydroxyl, sulfonic groupetcis usedfrequently.In our country，the processing technologies of the water-proof &moisture-permeable membrane and membrane bag filter could meet the requirements, but there are some problems needed to be resolved in bubble membrane and hydrophilic membrane.