Method for producing coloured concrete bodies

Details Method for producing coloured concrete bodies Method for producing coloured concrete bodies

C - Chemistry, Metallurgy

04

B

C04B 16/04 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2231264

The invention relates to a method for producing coloured concrete bodies, particularly coloured concrete roof tiles, whereby pigment is added to the unprocessed concrete mix. In order to provide a method which makes possible the production of permanently coloured concrete bodies with reasonably priced pigments which are stable in outdoor exposure and are resistant to light, particularly UV, alkalis and heat, it is proposed that a cement compatible aqueous polymer dispersion in which organic pigment is dispersed be added to the unprocessed concrete mix. Suitable cement compatible polymer dispersions are aqueous polymer dispersions based on styrol and/or pure acrylate. Phthalocyanine or China acridon pigments are particularly suitable as organic pigments.

L'invention concerne un procédé de production d'éléments colorés en béton, notamment de tuiles de toit colorées en béton, ce procédé consistant à ajouter un pigment au mélange de béton non traité. Afin de réaliser un procédé qui rende possible la production d'éléments en béton à la couleur solide, et ce à l'aide de pigments qui sont d'un prix raisonnable, sont stables lorsqu'exposés à l'extérieur et résistants à la lumière, notamment aux U.V., ainsi qu'aux alcalins et à la chaleur, on propose d'ajouter au mélange de béton non traité une dispersion polymère aqueuse, compatible avec le ciment, dans laquelle on a dispersé un pigment organique. Des dispersions compatibles et appropriées sont constituées par des dispersions polymères aqueuses à base de styrol et/ou d'acrylate pur. Des pigments du type phtalocyanine ou acridone de Chine conviennent notamment en tant que pigments organiques.

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