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폴리술폰 중공사막의 제조와 한외여과 틀성

Preparation of Polysulfone Hollow-Fiber Membranes and Their Ultrafiltration Characteristics

HWAHAK KONGHAK, June 1988, 26(3), 304-313(10), NONE
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Abstract

건습식 방사기법에 의해 폴리술폰 중공사막을 제조하었으며, 방사조건이 막성능에 미치는 영향과 제조된 막의 한외여과 특성을 조사하였다. 중공사막은 폴리술폰을 N, N-디메틸아세트아마이드나 N, N-디메틸포름아마이드 같은 용매에 용해시킨 후 폴리비닐피롤리돈이나, 2-메톡시에탄올 같은 첨가제나 기공형성제를 섞어 만든 방사용액에서 제조되었다. 내·외부응고제로는 물 또는 물-용매의 혼합물을 썼다. 방사용액의 조성, 내·외부 응공제의 유속, 방사높이 등을 주요 방사변수로 조사하였고, 성능평가로서 순수물투과량, 용질배제율, 분획분자량 등을 측정하였다. 제조된 중공사막은 2-20X10-33/㎝2·atm·min 정도의 물투과속도를 나타내었으며, 분획분자량을 측정한 결과 2,000 ppm 처리 용액을 썼을 때 폴리에틸렌글리콜(PEG)용질의 경우 분자량 7,500-18,500, 폴리비닐피롤리돈(PVP) 용질의 경우 분자량 24,000-160,000 범위에서 분획성을 보였다. 최대 배제율은 폴리비닐피롤리돈(M.W. 160,000)의 경우 94 %였다.
Several polysulfone hollow fiber membranes for ultrafiltration were prepared by the dry-wet spinning technique with spinning solutions containing polysulfone in one of the solvents such as N, N-dimethyracetamae and N, N-dimethylformamide using polyvinylpyrrolidone and 2-methoxyethanol as additive and nonsolvent which act as pore forming agent. Water and solvent-water mixture were used as bore coagulant and gelation medium. The principal variables of the spinning process investigated are spinning solution composition, the flow rate and composition of the bore coagulant, the air gap between the spinnerette and the gelation bath, etc. As the performance test, pure water flux, solute rejections, and the cut off molecular weights were measured.

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