Process for preparing bismuth vanadate pigments with high...

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/00 (2006.01) C01G 31/00 (2006.01) C08K 3/24 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2139485

A method for preparing a bismuth vanadate based pigment by (1) reacting an acidic bismuth nitrate solution with an alkaline ammonium metavanadate solution and optionally with other salts, to form a bismuth vanadate based precipitate in a highly acidic reaction medium with a pH of 1-2; (2) adding a base until the pH of the reaction medium is around 7; (3) raising the temperature to over 80 C in around 30 minutes while holding the pH at 7 by means of a base; (4) stirring for 30 minutes to over 2 hours until the pH is around 6.5; and (5) filtering, washing and drying the pigment. The resulting products and their use in dyeing paints, lacquers and/or plastics are also disclosed.

2139485 9401497 PCTABS00165 La présente invention concerne un procédé de préparation d'un pigment à base de vanadate de bismuth dans lequel: 1) on fait réagir une solution acide de nitrate de bismuth avec une solution basique de métavanadate d'ammonium et éventuellement d'autres sels pour former un précipité à base de vanadate de bismuth dans un milieu réactionnel très acide à un pH de l'ordre de 1-2; 2) on amène le pH du milieu réactionnel à une valeur de l'ordre de 7 par addition d'une base; 3) on porte la température à une valeur de plus de 80 ·C en une durée de l'ordre de 30 minutes tout en maintenant le pH à une valeur de 7 avec une base; 4) on agite pendant 1/2 heure à plus de 2 heures jusqu'à un pH de l'ordre 6,5; 5) on filtre, lave et sèche le pigment. L'invention concerne également les produits obtenus par ce procédé et leur application pour la coloration des peintures, des laques et/ou des matières plastiques.

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