A process for manufacturing titanium dioxide pigment having...

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/36 (2006.01)

Patent

CA 2214244

This invention provides a process for making titanium dioxide pigment, wherein an aqueous slurry of hydrous oxide surface-treated TiO2 particles is subjected to media milling. The TiO2 particles are surface-treated with a coating comprising a hydrous oxide such as silica and/or alumina, and the slurry is filtered prior to media milling. The milled slurry is dried and the dried product is fluid-energy milled to produce TiO2 pigment having good particle size distribution. The TiO2 pigments may be used to make coating formulations having high gloss.

La présente invention fournit un procédé pour fabriquer des pigments d'anhydride titanique dans lequel une suspension aqueuse de particules de TiO2 dont la surface a été traitée à l'aide d'un oxyde hydraté est soumis à un broyage par corps broyant. La surface des particules de TiO2 est traitée avec un revêtement comprenant un oxyde hydraté comme la silice et/ou l'alumine, et la suspension est filtrée avant le broyage par corps broyant. La suspension broyée est séchée et le produit séché est broyé dans un broyeur à jet fluide pour produire des pigments de TiO2 dont la distribution granulométrique est bonne. Les pigments de TiO2 peuvent être utilisés pour fabriquer des formulations de revêtement ayant un lustre très brillant.

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