Isoporous membrane and method for its production

Details Isoporous membrane and method for its production Isoporous membrane and method for its production

B - Operations, Transporting

01

D

B01D 67/00 (2006.01) C08J 5/22 (2006.01) C09J 9/00 (2006.01)

Patent

CA 2660956

The invention relates to a method of producing a membrane, in particular a polymer membrane, preferably an ultrafiltration membrane or nanofiltration membrane, and also to a membrane produced by this method and to the use of such a membrane for ultrafiltration or nanofiltration. The membrane is produced according to the invention in the following steps: - dissolve one or more polymers of which at least one polymer is a block copolymer, in a casting solution, comprising a solvent or a plurality of solvents, or in a casting solution having at least one solvent and at least one nonsolvent, spreading out the casting solution with the one or more polymers dissolved therein to form a film, - dipping the film into a precipitation bath, comprising at least one nonsolvent for the block copolymer, so that the film is precipitated out or produced to form a membrane.

L'invention concerne un procédé de fabrication d'une membrane, en particulier une membrane polymère, de préférence une membrane d'ultrafiltration ou une membrane de nanofiltration, ainsi qu'une membrane fabriquée selon ce procédé et l'utilisation d'une membrane de ce type pour l'ultrafiltration ou la nanofiltration. Selon l'invention, la membrane est fabriquée suivant les étapes consistant à : - dissoudre un ou plusieurs polymères, dont au moins un polymère séquencé, dans une solution de coulée comprenant un ou plusieurs solvants, ou dans une solution de coulée comprenant au moins un solvant et au moins un non-solvant, - étaler la solution de coulée contenant le ou les polymères dissous sur un film, - plonger le film dans un bain de précipitation, comprenant au moins un non-solvant pour le polymère séquencé, de sorte que le film fabrique ou forme une membrane par précipitation.

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