发明名称 |
Dried semipermeable membrane and manufacture thereof |
摘要 |
Dry semipermeable membranes of polyacrylonitrile or copolymers containing more than 65 wt. % of acrylonitrile are prepared by dissolving the polymer in a solvent in a solids concentration of 15-30% by weight; uniformly coating the solution onto a surface in a desired shape under an atmosphere whose relative humidity is 60-85% and dipping said coated surface into a non-solvent medium so as to remove the solvent which forms the membrane; heat-treating the membrane under moist conditions at 60 DEG -90 DEG C; and drying the membrane at a temperature less than the temperature of the heat treatment under conditions such that the coefficient of contraction is less than 1%, whereby a dried semi-permeable membrane having an open-celled structure with a pore size of a diameter less than 0.5 mu and a porosity of 0.40-0.7 is obtained.
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申请公布号 |
US4025439(A) |
申请公布日期 |
1977.05.24 |
申请号 |
US19750621076 |
申请日期 |
1975.10.09 |
申请人 |
MITSUBISHI RAYON CO., LTD. |
发明人 |
KAMADA, KENSUKE;MINAMI, SHUNSUKE |
分类号 |
B01D71/42;(IPC1-7):B01D13/04 |
主分类号 |
B01D71/42 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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