| 摘要 |
PURPOSE:To obtain hollow yarn having improved water permeability and mechanical strength, by dissolving an aromatic polysulfone in a mixed solution of a solvent and a nonsolvent, extruding the prepared solution from the outer pipe of a nozzle of double pipe type, bringing a coagulating solution into contact with one surface of extruded material, bringing air into contact with the other, immersing the material in water. CONSTITUTION:An aromatic polysulfone is dissolved in a solution of a polar organic solvent such as N-methyl-2-pyrrolidone, dimethyl-formamide, etc. and 20 -45wt.% nonsolvent such as ethylene glycol, etc. to give 10-30wt.% solution, which extruded from the outer pipe of a nozzle of double pipe type. In the operation, one of the outer and the inner sides of the tubular solution is brought into contact with a coagulating solution such as water, etc., and the other, with air. The solution is then immersed in water, the solvent and the nonsolvent are extracted to give hollow yarn. The hollow yarn has 10-100Angstrom very small holes at the side brought into contact with the coagulating solution and 0.05-5mu pores at the other.
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