Organic pigment dispersion for coloring building materials

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 16/00 (2006.01) C04B 20/02 (2006.01) C04B 40/00 (2006.01) C09D 17/00 (2006.01)

Patent

CA 2393425

An aqueous organic pigment dispersion used to integrally color concrete and other building materials which includes: alkali metal silica particles as a binder, organic pigment, water and dispersing agent. A method for preparing the aqueous organic pigment dispersion includes (i) mixing alkali metal silica particles, organi c pigment, and dispersing agent; (ii) milling the dispersion precursor in a mixer filled with glass beads for a period of time sufficient to reduce the particle size of the organic pigment to about 100 to about 300 nanometers, thereby forming a non-standardized dispersion; and (iii) standardizing the dispersion against a color standard by adding water.

Cette invention se rapporte à une dispersion de pigment organique aqueuse servant à colorer intégralement du béton et d'autres matériaux de construction et qui contient à cet effet: des particules de silice de métaux alcalins comme liant; un pigment organique; de l'eau; et un agent de dispersion en quantité suffisante pour disperser le pigment organique et le liant dans l'eau. Le procédé permettant de préparer cette dispersion de pigment organique aqueuse consiste (i) à mélanger, à une vitesse de 3000 à 10000 tours/minute, les particules de silice de métaux alcalins; le pigment organique; et l'agent de dispersion, afin de former un prémélange de dispersion; (ii) à broyer le précurseur de dispersion dans un mélangeur rempli de billes de verre pendant une période suffisante pour réduire la taille des particules du pigment organique à un niveau compris entre environ 100 et environ 300 nanomètres, afin de former une dispersion non normalisée; et (iii) à normaliser la dispersion en la confrontant à une norme de couleur, par adjonction d'eau.

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