Heat transfer liquids with glass corrosion prevention, in...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 5/10 (2006.01) C09K 5/20 (2006.01)

Patent

CA 2514103

The invention relates to a thermal liquid concentrate containing a glycol and: a) 0.05 to 10 percent by weight, preferably 0.1 to 5 percent by weight, of one or several aliphatic amines of general formula (I), wherein R1 to R3 can be identical or different and represent hydrogen, optionally branched C1-C9alkyl, or C1-C9 hydroxyalkyl; b) 0.005 to 3 percent by weight, preferably 0.01 to 1 percent by weight, of one or several optionally stabilized silicates; c) 0 to 3 percent by weight of one or several corrosion inhibitors selected among the group comprising hydrocarbon triazoles and hydrocarbon thiazoles; d) 0 to 5 percent by weight of one or several alkali metal molybdates, ammonium molybdates, or substituted ammonium molybdates; and e) 0 to 1 percent by weight of one or several polymeric hard water stabilizers. The inventive concentrates are particularly suitable for use in solar systems after being optionally diluted with water, thermal liquid being in direct contact with the glass of the solar system.

La présente invention concerne un concentré de fluide caloporteur contenant non seulement au moins un glycol mais aussi: a) 0,05 à 10 % en poids, de préférence 0,1 à 5 % en poids d'au moins une amine aliphatique de la formule générale (I) où R?1¿ à R?3¿ sont identiques ou différents et représentent un hydrogène, un alkyle C¿1?-C¿9 ?ou un hydroxyalkyle C¿1?-C¿9? éventuellement ramifié, b) 0,005 à 3 % en poids, de préférence 0,01 à 1 % en poids, d'au moins un silicate éventuellement stabilisé, c) 0 à 3 % en poids d'au moins d'un inhibiteur de corrosion sélectionné parmi les triazoles d'hydrocarbures et les thiazoles d'hydrocarbures, d) 0 à 5 % en poids d'au moins d'un molybdate de métal alcalin, d'ammonium ou d'ammonium substitué et e) 0 à 1 % en poids d'au moins un stabilisateur d'eau dure polymérique. Après une éventuelle dilution dans l'eau, les concentrés conviennent à une utilisation dans les installations solaires où le fluide caloporteur est en contact direct avec le verre de l'installation solaire.

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