Vinylidene fluoride based resin porous hollow yarn and...

B - Operations – Transporting – 01 – D

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B01D 71/34 (2006.01) D01F 6/12 (2006.01) D06M 13/08 (2006.01)

Patent

CA 2540471

A porous hollow yarn being composed of a vinylidene fluoride based resin having a weight average molecular weight of 300,000 or more, characterized in that, in the linear relationship formula between a coefficient of water permeability F (m3/m2.cndot.day), as measured under conditions of a pressure difference of 100 kPa and a water temperature of 25~C and in the range of a test length L = 0.2 to 0.8 (m), and a test length L: F = C.cndot.L + F0 (formula 1), the requirements (a) to (d): (a) an average slope C (/day) is -20 <= C <= 0, (b) an intercept (base water permeability) F0(m3/m2.cndot.day) is F0 >= 30, (c) the relationship between F0(m3/m2.cndot.day) and average pore diameter P (µm) as measured according to the half dry method is F0/P >= 300, and (d) the outer diameter is 3 mm or less are satisfied. The above porous hollow yarn exhibits a coefficient of water permeability which is enhanced in that per a piece of yarn and is reduced in the dependency on the length thereof, and exhibits enhanced treatment efficiency per volume when it is used as a filtration module, and thus is suitably used as a precise filtration member.

Un fil creux poreux composé de résine à base de fluorure de vinylidène ayant un poids moléculaire moyen de 300,000 minimum, est caractérisé en ce que, dans la formule de rapport linéaire entre un coefficient de perméabilité à l'eau F (m?3¿/m?2¿ X jour), tel que mesuré dans des conditions de différentiel de pression de 100 kPa et une eau à 25 ·C et dans une plage de longueur de contrôle L= 0,2 à 0,8 (m) et une longueur de contrôle L: F= C x L+ F¿0? (formule 1), les exigences suivantes: (a) pente moyenne C (/jour): 20 <= C<= 0, (b) point d'intersection (perméabilité à l'eau de base) F¿0? (m?3¿/m?2¿ X jour):F¿0?>= 30, (c) relation entre F¿0? (m?3¿/m?2¿ X jour) et le diamètre moyen des pores P (µm) tel que mesuré par le procédé moitié sec:F¿0? /P>= 300, et enfin, (d) diamètre externe: 3mm maximum, sont satisfaites. Le fil creux poreux précité présente un coefficient de perméabilité à l'eau qui est amélioré par morceau de fil et qui est moins dépendant de la longueur du fil. De plus, ce fil possède une meilleure efficacité au traitement par volume lorsqu'il est utilisé comme module de filtration, ce qui permet de l'utiliser comme élément de filtration précis.

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