HYDROPHILIC POLYTETRAFLUOROETHYLENE FILTER MEMBRANE AND ITS PRODUCTION

摘要

PURPOSE:To obtain the titled hydrophilic PTFE membrane having resistance to both heat and chemicals by cross-linking a fluorine surfactant on the PTFE membrane until the surfactant is made insoluble in aq. soln. CONSTITUTION:An anionic fluorine surfactant is coated on the surface of a PTFE filter membrane having narrow pore diameter distribution. At this time, the PTFE filter membrane is placed under 100-150mmHg reduced pressure and immersed in a dilute soln. of the fluorine surfactant to reduce the immersion time. After hydrophilicity is provided to the porous surface of the fluorine surfactant by the complete immersion, high-energy radiation rays are irradiated to make the fluorine surfactant insoluble in water. The reaction is preferably carried out under conditions where oxygen is substantially absent.