Development and application of polytetrafluoroethylene filtration membrane

The application, microporestructure, key controlling techniques and development of polytetrafluoroethylene( PTFE) filtration membrane are introduced. The development direction of PTFE filtration membrane to precise control and the application in fresh air system and membrane distillation 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 modification method through pose finishing of hydrophilic substances containing hydrophilic groups,such as carboxyl,hydroxyl,sulfonic group,etc. is used frequently. In China,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.