Fluoromodified admixture for cementitious products, process...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/10 (2006.01) C04B 24/28 (2006.01) C08G 18/28 (2006.01) C08G 18/30 (2006.01) C08G 18/36 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2645243

A fluorine-modified additive having a content of isocyanate and also urethane and/or urea groups is described. It has been found that, surprisingly, the inventive fluorine-modified additive, even at very low dosage, is outstandingly suitable for permanent hydrophobic and/or oleophobic and/or soil-repellent in-bulk modification of products based on inorganic or hydraulic or mineral binders, without significantly influencing the fundamental property profile (for example compressive and flexural strengths) of these products. In addition, it was not foreseeable that, in the products treated with the inventive fluorine-modified additives (for example hardened building materials), a significantly lower water absorption (prevention of frost damage and corrosion) and suppression of blooms on the surface (prevention of visual impairments) are observed. Moreover, it could not have been expected that, in spite of the high fluorine modification, there is sufficient self-dispersibility.

L'invention concerne un additif modifié par du fluor, contenant des groupements isocyanate, ainsi qu'uréthanne et/ou urée. Il a été observé, de manière surprenante, que l'additif modifié par du fluor selon l'invention permet, même en quantité très faible, de conférer un excellent caractère hydrophobe et/ou oléophobe et/ou antitache à des équipements en vrac constitués de produits à base de liants inorganiques, hydrauliques ou minéraux, sans affecter considérablement les propriétés fondamentales (par exemple résistance à l'extension par pression et par flexion) de ces produits. Il n'était en outre pas prévisible que le traitement de produits (par exemple des matériaux de construction durcis) avec l'additif selon l'invention entraîne une absorption d'eau nettement plus faible (permet d'éviter les dégâts du gel et la corrosion), ainsi qu'une suppression de l'efflorescence sur les surfaces (permet d'éviter les défauts optiques). En outre, il n'était pas prévisible que, malgré le niveau élevé de modification par du fluor, une autodispersibilité suffisante soit obtenue.

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