ALL-SEASON HYDRAULIC OIL Russian patent published in 2006 - IPC C10M169/04 C10M171/02 C10M105/04 C10M133/12 C10M129/10 C10M137/04 C10M133/16 C10M129/42 C10N40/08 

FIELD: oils used as hydraulic fluids in hydraulic systems and hydraulic actuators.

SUBSTANCE: claimed composition contains (mass %): 4-methyl-2,6-di-tert-buthylphenol 0.2-0.3; tricrezyl phosphate 0.3-0.5; polymethylsiloxane fluid 0.003-0.005; phenyl-α-naphthyl amine 0.1-0.2; mixture of C₁₂-C₁₅-alkynylsuccinic acids 0.2-0.3; addend 0.08-0.12; polyalphaolefins with viscosity of 1.7-2.0 mm²/s at 100°C 10-35; and balance to 100 % polyalphaolefins with viscosity of 1.7-2.0 mm²/s at 100°C. Oil of present invention may be used at temperatures from 80°C to -50°C.

EFFECT: increased viscosity constancy at mechanical/dynamic stress; decreased corrosive action on structure materials during storage and operation.

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