首页>
外国专利>
A METHOD FOR PRODUCING ASYMMETRIC SUPPORTING MEMBRANES FOR COMPOSITE MEMBRANES AND ASYMMETRIC SUPPORTING MEMBRANES HAVING IMPROVED PERMEATION AND MECHANICAL STRENGTH PRODUCED THEREFROM
A METHOD FOR PRODUCING ASYMMETRIC SUPPORTING MEMBRANES FOR COMPOSITE MEMBRANES AND ASYMMETRIC SUPPORTING MEMBRANES HAVING IMPROVED PERMEATION AND MECHANICAL STRENGTH PRODUCED THEREFROM
展开▼
机译：制备复合膜的不对称支撑膜的方法和渗透率和机械强度得到改善的不对称支撑膜的制备
展开▼
页面导航
摘要
著录项
相似文献
摘要
PURPOSE: A method is provided to produce an asymmetrical supporting membrane improved the transmission and the mechanical intensity from a polyimide by controlling the diffusing speed of a high molecular solution. CONSTITUTION: A high molecular solution is produced by melting the 15-25wt% polyimide standardized on the whole weight of the high molecular solution into a mixed solvent, which comprises of a main solvent whose mixed heat with water as a non-solvent is endothermic and a co-coolant whose mixed heat with the non-solvent is exothermic, and whose mixed heat with the non-solvent is endothermic when the main solvent and the co-coolant are mixed. An asymmetrical membrane is produced by immersing a membrane produced by phase-separating the high molecular solution in water. Because the asymmetrical membrane composed of a pore opened a sponge-typed porous supporting layer is produced by using the mixed solvent whose mixed heat with the non-solvent is endothermic, the penetrating property and the mechanical intensity are improved, and a composite membrane having the improved selectivity is produced by forming a thin coated membrane thereon.
展开▼
