| 摘要 |
PURPOSE:To prepare a micro porous membrane of network structure carrying specified value of average bore diameter and porosity, and of superb chemical resistance, heat resistance, filtering characteristics and mechanical colid-state properties by utilizing a copolymerizates of polychlorotrifluoroethylene or of ethylene chlorotrifluoroethylene. CONSTITUTION:10-60vol% of polychlorotrifluoroethylene family resin, 7-42vol% of inorganic finely divided component such as finely divided silicic acid and the like and 30-75vol% of chlorotrifluoroethylene oligomer are mixed, and, after being fused and kneaded by the extruder and the like, melt molded into the form of plane membrane, hollow membrane, etc. The molded membrane part is dipped in the solvent such as trichloroethane to extract chloroetifluoroethylene oligomer. Then, inorganic finely divided component is extracted with such solvents as caustic soda. Thus, a micro porous membrane of polychlorotrifluoroethylene having a network carrying average bore diameter 0.01-5mu and porosity 40-90%, is prepared.
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