WORKING LIQUID FOR HYDRAULIC SYSTEMS Russian patent published in 2018 - IPC C10M171/02 C10M105/36 C10M169/04 C10M107/50 C10M129/42 C10M129/10 C10M133/12 C10M137/04 C10N40/08 C10N30/08 

FIELD: chemistry.

SUBSTANCE: invention relates to working (hydraulic) fluids and can be used in the fields of technology requiring the use in hydraulic systems of operating fluids with a wide range of operating temperatures and possessing increased fire safety, in particular, in aircraft technology. Hydraulic fluid for hydraulic systems includes a base composition comprising a polyethylsiloxane liquid having a viscosity of 44.0⋅10^-6–49.0⋅10^-6 m²/s at 20 °C and Syntolux L-132 dicarboxylic acid ester with a viscosity of 3.2⋅10^-6 m²/s at 100 °C, as well as additives: 4-methyl-2,6-di-tert-butylphenol, phenyl-α-naphthylamine, tributyl phosphate and high molecular weight thickener Syntolux V-15, vinyl acetate polymer with a viscosity of at least 1,000⋅10^-6 m²/s at 100 °C.

EFFECT: working fluid has a high thermo-oxidative stability, the necessary tribological and viscosity-temperature characteristics, increased fire safety and ensures the safe operation of hydraulic systems of aircraft in the entire range of operating temperatures.

1 cl, 2 tbl