Supercritical fluid aided coating of particulate material

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 175/04 (2006.01) B01J 2/00 (2006.01) B05D 1/02 (2006.01) B05D 7/00 (2006.01) C08J 3/28 (2006.01) C08J 7/04 (2006.01) C09D 125/06 (2006.01) C09D 133/04 (2006.01) C09D 133/08 (2006.01) C09D 163/00 (2006.01) B05D 3/06 (2006.01)

Patent

CA 2306215

A method for preparing coatings of thin films onto solid particle has been achieved by in-situ simultaneous nucleation and deposition of dissolved material out of a supercritical fluid, resultant film formation on the solid particles suspended in the supercritical fluid, and subsequent thermal conditioning of the coating on the particles. The coating method involves an enclosed system that provides: 1) for suspension of the solid particles to be coated; 2) for dissolution of the coating material in the supercritical fluid solvent; 3) for temperature or pressure swing operations causing film deposition/coating of the suspended solid particles and; 4) additional chemical addition and/or thermal cycles providing for any additional reactions required (such as polymerization).

Ce procédé de préparation de revêtements en minces couches sur des particules solides consiste à effectuer simultanément et in situ une nucléation et un dépôt de matière dissoute, à partir d'un fluide supercritique, une formation de couche résultant sur les particules solides en suspension dans le fluide supercritique, formation suivie d'un traitement thermique ultérieur du revêtement déposé sur les particules. Le procédé implique un système en espace fermé consistant: 1) à suspendre les particules solides à revêtir, 2) à dissoudre la matière de revêtement dans le solvant fluidique supercritique, 3) à exécuter des opérations modulées en pression et en température, afin de provoquer le dépôt de film sur les particules solides en suspension et/ou le revêtement de celles-ci, et 4) à prévoir une addition chimique supplémentaire et/ou des cycles thermiques pour toute réaction additionnelle requise (comme la polymérisation).

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