Method for producing rheological additives and coating...

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/42 (2006.01) B02B 5/02 (2006.01) B02C 19/00 (2006.01) C09C 3/04 (2006.01) C09D 7/00 (2006.01)

Patent

CA 2281554

A process for preparing an additive-thickened water-based coating formulation exhibiting improved pourability, hiding characteristics, and thickening in relation to the quantities of rheological additive in the coating formulation. The process involves preparing an aqueous smectite clay slurry having 3 to 30 % clay by weight; bead milling the aqueous smectite slurry with a grinding media at an energy input in the range of from about 44 of 146 kw-hr/metric ton of dry clay; and incorporating the milled smectite slurry as a rheological additive in a water-based coating formulation in an amount in the range of from about 6 to 120 g per liter of formulation.

L'invention concerne un procédé de préparation d'une formulation de revêtement aqueuse épaissie par un additif, cette formulation présentant une aptitude à l'écoulement et un pouvoir couvrant améliorés, ainsi que des capacités d'épaississement, qui sont fonction des quantités d'additif rhéologique contenues dans ladite composition de revêtement. Ce procédé consiste à préparer une barbotine d'argile smectite aqueuse renfermant 3 à 30 % d'argile en poids, à broyer sous forme de perles cette barbotine d'argile smectite aqueuse avec un agent de broyage, à un intrant énergétique situé entre 44 et 146 kw/h par tonne métrique d'argile sec, et à incorporer la barbotine d'argile smectite ainsi broyée en tant qu'additif rhéologique dans une formulation de revêtement aqueuse, dans une quantité variant entre 6 et 120 g par litre de formulation.

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