LOW AND MEDIUM FLUX MEMBRANES

摘要

A casting solution for preparing a low to medium flux membrane. The casting solution contains 19-25 % by weight polysulfone, polyethersulfone, or polyarylsulfone; 14-32 % by weight a hydrophilic compatible polymer; 0.1-6 % by weight an isocyanate capped polyethylene glycol urethane polymer; and 37-67 % by weight an aprotic and water miscible solvent; in which the polysulfone, polyethersulfone, or polyarylsulfone has a M.W. of 10,000-100,000 daltons, the isocyanate capped polymer contains 2-5 -N=C=O groups per molecule and has a M.W. of 500-5,000 daltons, and the compatible polymer contains 2-5 -CH2OH groups per molecule and has a M.W. of 200-1,000 daltons. Also disclosed are a method of spinning this casting solution to form a hollow fiber and the hollow fiber thus obtained.