Method for the preparation of a microporous diaphragm

C - Chemistry – Metallurgy – 25 – B

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C25B 13/04 (2006.01)

Patent

CA 2136763

Diaphragm for use in cells for the electrolysis of alkaline halide solutions comprising: 100 parts by weight of asbestos fibres, 30 to 70 parts by weight of silica-based derivatives and 20 to 60 parts by weight of fluorinated polymers, deposited on a porous material. The weight ratio of the fluorinated polymers and the silica-based derivatives is between 0.6 to 1.2 and preferably between 0.6 to 0.9 with the exception of a diaphragm obtained by depositing a suspension comprising 100 parts by dry weight of asbestos fibres, 30 parts by dry weight of silica-based derivatives, 25 parts by dry weight of fluorinated polymers and 1.5 parts by dry weight of a thickening agent. The invention also concerns a method for the preparation of an optionally microporous diaphragm. The diaphragms of the invention are especially useful in aqueous alkaline halide solutions electrolysis cells.

2136763 9423093 La présente invention concerne un diaphragme susceptible d'être utilisé dans des cellules d'électrolyse de solutions d'halogénures alcalins comprenant: 100 parties en poids de fibres d'amiante, 30 à 70 parties en poids de dérivés à base de silice, 20 à 60 parties en poids de polymère fluoré; déposés sur un matériau poreux, et en ce qu'il présente un rapport en poids du polymère fluoré sur les dérivés à base de silice compris entre 0,6 et 1,2 et de préférence compris entre 0,6 et 0,9 à l'exception d'un diaphragme obtenu par dépôt d'une suspension comprenant 100 parties en poids sec de fibres d'amiante, 30 parties en poids sec de dérivés à base de silice, 25 parties en poids sec de polymère fluoré, 1,5 parties en poids sec d'un agent épaississant. Elle concerne également un procédé de préparation de diaphragme éventuellement microporeux. Ces diaphragmes sont notamment utilisables dans des cellules d'électrolyse de solutions aqueuses d'halogénures alcalins.

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