| 摘要 |
PURPOSE:To obtain a hollow fibrous membrane having high inner surface smoothness and high mechanical strength and capable of suppressing concn. polarization, by using a solution which is prepared by dissolving a polyether sulfone in a mixture consisting of a polar org. solvent and a surfactant as a spinning stack solution. CONSTITUTION:A polyether sulfone resin is dissolved in a solvent mixture consisting of a polar org. solvent for dissolving said polyether sulfone and a surfactant at room temp. or under heating to prepare a spinning stock solution. The concn. or polyether sulfone is pref. 10-25wt% and the ratio of the surfactant and the solvent is pref. 1:99-3. An internal coagulation liquid and a coagulation bath are pref. water but a metal salt or a solvent or non-solvent of polyether sulfone may be added and proper spinning temp. is room temp. - 100 deg.C. |
