Method for concentrating aqueous fluoropolymer dispersion

C - Chemistry – Metallurgy – 08 – F

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C08F 6/20 (2006.01) C08F 14/18 (2006.01) C08J 3/03 (2006.01)

Patent

CA 2251683

A method for concentrating an aqueous dispersion of a fluoropolymer including one which is capable of easily forming fibers, such as PTFE, with a low energy consumption at a low cost in a short time merely by using a small amount of a surfactant selected from among various kinds thereof. An aqueous fluoropolymer dispersion containing 2.0 to 8.0 % by weight, based on the solid content of the fluoropolymer, of a surfactant is fed to a microfiltration film having a pore size of 0.01 to 1 µm through feeding means substantially free from shearing force to remove the aqueous medium containing the surfactant from the aqueous dispersion.

Procédé pour concentrer une dispersion aqueuse d'un polymère fluoré, y compris du type de ceux qui peuvent former facilement des fibres, par ex. le PTFE, avec une faible consommation d'énergie, rapidement et à moindre coût, par l'utilisation d'une faible quantité d'un tensioactif sélectionné parmi différents types. Une dispersion aqueuse de polymère fluoré, contenant 2,0 à 8,0 % en poids d'un tensioactif, par rapport à la teneur en matière solide du polymère fluoré, est acheminée à un film de microtitration présentant une dimension des pores comprise entre 0,01 à 1 µm, par l'intermédiaire de moyens d'acheminement pratiquement sans force de cisaillement afin de retirer le milieu aqueux contenant le tensioactif, présent dans la dispersion aqueuse.

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