POROUS MEMBRANE FOR WATER TREATMENT AND PROCESS FOR PRODUCING THE SAME

摘要

A porous membrane for water treatment which is made of a resin composition comprising 100 parts by weight of a polyvinylidene fluoride resin and 5-13 parts by weight of a polyvinyl alcohol polymer having a degree of saponification of 10-80 mol%, characterized by having a tension in penetration/wetting of 38-72 mN/m, a tensile strength of 7-20 MPa, and excellent mechanical strength and wettability. With the porous membrane for water treatment, which comprises a polyvinylidene fluoride resin as the main component, the treatment of a raw water (river water, industrial wastewater, etc.) can be efficiently conducted. The porous membrane for watertreatment is produced by melt-extruding a composition comprising a polyvinylidene fluoride resin, a polyvinyl alcohol polymer, a plasticizer, and a solvent and removing the plasticizer and solvent from the extrudate by extraction.