Methylpolysiloxane hydraulic fluids.

摘要

A methylpolysiloxane oil containing CH3SiO3/2, (CH3)2SiO, and/or (CH3)3SiO1/2 units and having a specific gravity of 1.02 or greater has been found useful as an hydraulic fluid. The specific gravity of the hydraulic fluid allows for any water introduced into the system to collect as an upper layer above the hydraulic fluid where it can be removed easily. A particularly preferred methylpolysiloxane hydraulic fluid contains 0 to 10 mol percent (CH3)3SiO1/2 units, 45-80 mol percent (CH3)2SiO units, and 20-45 CH3SiO3/2 units with a 1.65 to 1.80 CH2/Si ratio.