Coolants for cooling systems in fuel cell drives

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 5/20 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2430443

Antifreeze concentrates for cooling systems in fuel cell drives, from which ready-to-use aqueous coolant compositions having a conductivity of not more than 50 µS/cm result and which are based on alkylene glycols or derivatives thereof, contain orthosilicic esters (I) (see formula I) where R1 to R4 are identical or different and are C1- to C20-alkyl, C2- to C20-alkenyl, C1- to C20-hydroxyalkyl, unsubstituted or substituted C6- to C12-aryl and/or a glycol ether substituent of the formula -(CH2-CH2-O)n-R5, where R5 is hydrogen or C1- to C5-alkyl and n is from 1 to 5.

L'invention concerne des concentrés d'antigel pour systèmes de refroidissement de mécanismes d'entraînement à cellules de combustible, desquels résultent des compositions aqueuses d'agents réfrigérants, prêtes à l'emploi, d'une conductibilité maximale de 50 mu s/cm, à base d'alkylèneglycols ou de leurs dérivés, contenant des esters d'acide ortho-silique (I). Dans la formule (I), les variables R<1> à R<4> sont identiques ou différentes et désignent des substituants d'alkyle C1 à C20, alkényle C2 à C20, d'hydroxyalkyle C1 à C20, d'aryle C6 à C12 éventuellement susbtitués et/ou de glyocoléthers, R<5> désignant hydrogène ou alkyle C1 à C5 et n valant un nombre compris entre 1 et 5.

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