Lubricating oil composition for refrigerators

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 171/02 (2006.01) C10M 107/24 (2006.01) C10M 107/34 (2006.01) C10M 111/04 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2408133

A lubricating oil composition for refrigerating machines which is obtained by compounding a base oil ingredient (1) having a dynamic viscosity at 100~C of 3 mm2/g or lower and a viscosity index lower than 250 with a base oil ingredient (2) having a dynamic viscosity at 100~C of 25 mm2/s or higher and a viscosity index lower than 250 and which has a viscosity index of 250 or higher. The composition enables the refrigerating machine to employ a fluorocarbon refrigerant or natural refrigerant. The lubricating oil composition retains a proper dynamic viscosity at high temperatures and a low dynamic viscosity at low temperatures. Namely, it has a high viscosity index.

L'invention concerne une composition d'huile de lubrification pour machines frigorifiques, obtenue par le mélange d'une huile de base (1) d'une viscosité dynamique de 3 mm?2¿/s ou moins à 100 ·C et d'un indice de viscosité inférieur à 250, avec une huile de base (2) d'une viscosité dynamique de 25 mm?2¿/s ou plus à 100 ·C et d'un indice de viscosité de 250 ou plus. La composition permet d'employer un réfrigérant fluorocarboné ou un réfrigérant naturel pour le réfrigérateur. Cette composition d'huile de lubrification conserve sa viscosité dynamique propre à des températures élevées et une viscosité dynamique basse à des températures basses, c'est-à-dire qu'elle possède un indice de viscosité élevé.

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