Porous membrane for water treatment and method of...

B - Operations – Transporting – 01 – D

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B01D 71/34 (2006.01) B01D 69/08 (2006.01) B01D 71/38 (2006.01) C02F 1/44 (2006.01)

Patent

CA 2572492

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.

Membrane poreuse pour le traitement de l'eau laquelle est faite d'une composition de résine comprenant 100 parties en poids d'une résine de fluorure de polyvinylidène et 5-13 parties en poids d'un polymère d'alcool polyvinylique ayant un degré de saponification de 10-80 mol%, caractérisée en ce qu'elle a une tension de pénétration/mouillage de 38-72 mN/m, une résistance à la rupture par traction de 7-20 MPa et d'excellentes résistance mécanique et mouillabilité. Avec la membrane poreuse pour le traitement de l'eau, laquelle comprend une résine de fluorure de polyvinylidène comme composant principal, on peut effectuer de façon efficace le traitement d'une eau brute (eau de rivière, eau résiduaire industrielle, etc.). On produit la membrane poreuse pour le traitement de l'eau par extrusion en phase fondue d'une composition comprenant une résine de fluorure de polyvinylidène, un polymère d'alcool polyvinylique, un plastifiant et un solvant et en enlevant par extraction le plastifiant et le solvant du produit d'extrusion.

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