| 摘要 |
PURPOSE:To manufacture an anisotropic membrane having excellent oxygen- enriching performance by treating a porous membrane under an atmosphere contg. a specific solvent. CONSTITUTION:The anisotropic membrane is manufactured from high polymer materials having >=3 separation factor of oxygen to nitrogen such as poly (4- vinylpyridine), polysulfon, polycarbonate, cellulose acetate and cellulose ether. The material is dissolved in an organic solvent contg. a nonsolvent, and pushed out into the air through a spinneret, then introduced into an aq. coagulation bath to obtain a porous membrane. The obtained membrane is treated by passing the membrane through a gaseous atmosphere contg. a solvent for the material of the membrane, by dipping the membrane in a soln. contg. said solvent, or by spraying the soln. By this treatment, the defects of the membrane such as pinholes are mended, and the separation factor is improved. |
