FIELD: chemistry.
SUBSTANCE: composition for moulding a hollow fibre membrane by co-extrusion of spinning solution and internal precipitant solution is proposed. The spinning solution comprises a polysulfone, two polysulfone solvents and a polysulfone nonsolvent, wherein the second solvent has higher volatility than the first solvent. The spinning solution comprises N-methylpyrrolidone or N,N-dimethylformamide as the first solvent, the spinning solution comprises tetrahydrofuran or dichloromethane as the second solvent. The spinning solution comprises ethyl alcohol or triethylene glycol as the polysulfone nonsolvent. The internal precipitant solution comprises N-methylpyrrolidone or N,N-dimethylformamide in an amount of 40-97 wt % and water.
EFFECT: improved selectivity of obtained hollow fibre membrane.
3 dwg, 1 tbl
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