| 摘要 |
PURPOSE:To increase water permeation speed without substantially varying membrane properties by wet heat treating a porous membrane composed of aromatic polysulfone in the given range of temperature. CONSTITUTION:A porous membrane composed of aromatic polysulfone used for a reverse osmosis ultrafiltration membrane or the like is exposed to water vapor of high temperature and high pressure in a pressure-resistant vessel such as an autoclave or the like and wet heat treated at the temperature of 100 deg.C to 150 deg.C. Its permeation performance, particularly water permeation speed, is increased by said process without substantially varying mechanical strength and other membrane properties. Simultaneously, the membrane can be sterilized. |
