Cement compositions with a high photocatalytic power and an...

C - Chemistry – Metallurgy – 04 – B

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C04B 28/02 (2006.01) C04B 40/00 (2006.01) C04B 14/30 (2006.01) C04B 24/20 (2006.01) C04B 24/26 (2006.01) C04B 24/30 (2006.01) C04B 24/38 (2006.01)

Patent

CA 2694263

The present invention relates to new photocatalytic cement compositions, especially useful as paints, renders and plasters, provided with a high photocatalytic power and an optimal rheology, evaluated both in the step of preparing and in the step of applying. The compositions according to the invention specifically consist of a combination of organic additives, which, mixed with water and other components, provides cement compositions significantly more effective than the known compositions, both as far as rheology and photocatalytic power are concerned. The cement composition thus obtained associate features which have hardly been compatible up to now: on one side, a good workability (therefore a low viscosity) upon preparation from dry mixtures; on the other side, a good consistency in a wet state just after application. This avoids the occurrence of undesirable dripping before consolidation of the product. Finally, the photocatalytic power results surprisingly higher with respect to that of the known reference compositions when the same photocatalyst is used.

La présente invention concerne de nouvelles compositions de ciment photocatalytiques, particulièrement utiles en tant que peintures, rendus et plâtres, dotées d'un pouvoir photocatalytique élevé et d'une rhéologie optimale, tous deux évalués dans l'étape de préparation et dans l'étape d'application. Les compositions selon l'invention se composent spécifiquement d'une combinaison d'additifs organiques, qui, mélangés avec de l'eau et d'autres composants, donnent des compositions de ciment significativement plus efficaces que les compositions connues, tant du point de vue de la rhéologie que du pouvoir photocatalytique. La composition de ciment ainsi obtenue associe des caractéristiques qui ont été difficilement compatibles jusqu'ici : d'une part, une bonne maniabilité (par conséquent, une basse viscosité) lors la préparation à partir de mélanges secs; de l'autre, une bonne consistance à l'état humide juste après l'application. Ceci évite l'occurrence de bavures indésirables avant consolidation du produit. Pour finir, le pouvoir photocatalytique est étonnamment élevé par rapport à celui de compositions de référence connues quand le même photocatalyseur est utilisé.

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