Method for producing hollow fiber membrane

B - Operations – Transporting – 01 – D

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B01D 69/08 (2006.01) B01D 63/02 (2006.01) B01D 63/04 (2006.01) B01D 63/16 (2006.01) B01D 65/08 (2006.01) B01D 67/00 (2006.01) B01D 69/00 (2006.01) B01D 69/02 (2006.01) B01D 71/34 (2006.01) D01D 5/24 (2006.01) D01F 6/48 (2006.01) C02F 1/44 (2006.01)

Patent

CA 2407859

In a method for producing hollow fiber membranes which comprises melt kneading a mixture comprising polyvinylidene fluoride and an organic liquid or a mixture comprising polyvinylidene fluoride, an organic liquid and an inorganic fine powder, extruding the kneaded mixture to form hollow fibers, and extracting the organic liquid or the organic liquid and the inorganic fine powder from the hollow fibers, which includes the steps of drawing the hollow fibers before or after termination of the extraction and then shrinking the fibers. According to this method, it is possible to stably produce hollow fiber membranes having dense pores and having a high water permeation performance, excellent endurance and stain resistance, and which are suitable for filtration uses such as removal of turbidity of water.

L'invention concerne un procédé de fabrication d'un fil creux consistant à pétrir par fusion et à extruder un mélange d'un poly(fluorure de vinylidène) et un liquide organique ou un mélange de poly(fluorure de vinylidène), un liquide organique, et une fine poudre minérale, de manière à former une fibre creuse, puis à extraire le liquide organique ou le liquide organique et la fine poudre minérale de la fibre creuse. Le procédé selon l'invention est caractérisé en ce qu'il consiste par ailleurs à étirer la fibre creuse avant ou après extraction, puis à laisser la fibre se rétracter. Ledit procédé permet une fabrication stable d'une pellicule de fil creux comportant des micropores et présentant une perméabilité à l'eau élevée, ainsi qu'une durabilité et une résistance aux taches élevées. Par conséquent, la pellicule selon l'invention est particulièrement adaptée au filtrage, par exemple à l'extraction de turbidité.

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