All paraffinic, low temperature hydraulic oils

Details All paraffinic, low temperature hydraulic oils All paraffinic, low temperature hydraulic oils

C - Chemistry, Metallurgy

10

M

C10M 169/04 (2006.01)

Patent

CA 2517455

A paraffinic hydraulic oil having a shear stability index of from 0 to 20, a shear loss of less than 7% as measured by ASTM D5621 and a Brookfield viscosity the same or better than a naphthenic oil of the same viscosity grade is provided. The hydraulic oil includes 5 wt% to 90 wt% of a first paraffinic oil having a KV at 100~C of 2 to 6 cSt, 5 wt% to 90 wt% of a second paraffinic oil having a KV at 100~C of 3 to 14 cSt and 5 wt% to 10 wt% of a polymethacrylate viscosity index improver.

L'invention concerne une huile hydraulique à indice de stabilité au cisaillement compris entre 0 et 20, module de perte inférieur à 7 % mesuré selon la norme ASTM D5621, et viscosité égale ou supérieure à celle d'une huile naphténique ayant une qualité de viscosité identique. L'huile hydraulique comprend, en poids, entre 5 % et 90 % d'une première huile paraffinique ayant un KV à 100 ·C de 2 à 6 cSt, puis entre 5 % et 90 % d'une seconde huile paraffinique ayant un KV à 100 ·C de 3 à 14 cSt et enfin entre 5 % et 10 % d'un agent d'amélioration d'indice de viscosité au polyméthacrylate.

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