Polyether sulfone resin semipermeable membrane and its production

Abstract

Abstract PURPOSE:To obtain the title polyether sulfone resin semipermeable membrane having good water wettability and high water permeability by providing pores having specified mean diameter on both surfaces of the membrane, and incorporating a hydrophilic polymer into the membrane in a specified ratio. CONSTITUTION:A hydrophilic polymer such as polyvinyl pyrrolidone, a solvent such as dimethyl sulfoxide, a coagulant such as urea, and an additive such as polyethylene glycol are added to polyether sulfone to prepare a membrane forming soln. The soln. is discharged from a hollow spinneret while injecting an injection liq. such as dimethyl sulfoxide/polyvinyl pyrrolidone, and passed through the coagulation bath of water, etc. The obtained untreated yarn is washed with boiling water, dried with hot air, then further treated with boiling water, and dried. By this method, the semipermeable membrane with pores having >=500Angstrom mean diameter on both surfaces, contg. 1-30wt%, based on the total weight, hydrophilic polymer, and having >=1,000ml/hr.mmHg.m<2> water permeability is obtained.

Inventors

• 👤 Kazusane Tanaka
• 👤 和実 田中
• 👤 Masaaki Shimagaki
• 👤 昌明 島垣
• 👤 Seiji Shimamura
• 👤 島村　政治

Bibliographic Details