| 摘要 |
PURPOSE:To improve the separation rate and coefficient of water permeability and to obtain the titled reverse osmosis membrane of stabilized quality by coating the surface of a polymeric porous supporting membrane with the interfacially polymerized membrane formed with an epiamine and a diisocyanate. CONSTITUTION:The interfacially polymerized membrane formed with an epiamine and a diisocyanate is coated on the polymeric porous supporting membrane having about 10Angstrom -1mum pore diameter. The epiamine is the polymerization product of an alkylenediamine and an epihalohydrin. The polymeric porous supporting membrane is immersed in about 1-20% aq. soln. of the epiamine for about 1-24hr, and then air-dried for about 2-5min. The membrane is again immersed in the aq. epiamine soln. for about 10-120sec, air-dried for about 2-5min, and then brought into contact with about 0.05-0.5% diisocyanate soln. for about 1-10min. The membrane is then heat-treated for about 5-20min in an oven at about 90-110 deg.C. The membrane has the separation rate and coefficient of water permeability superior to the interfacially polymerized membrane using an acid halide. |
