aqueous compositions of hydraulic fluids and method for increasing thermal stability thereof

摘要

thermally stable marine control hydraulic fluid compositions an aqueous hydraulic fluid composition comprising one or more lubricants such as a monovalent metal salt, ammonium, or amine salt of a dicarboxylic acid such as a dicarboxylic acid c21 is described. wherein the aqueous composition of hydraulic fluids demonstrates increased thermal stability when exposed to elevated temperatures over an extended period of time while being able to tolerate the presence of 10% v / v of synthetic seawater. . the aqueous hydraulic fluid composition contains less than about 20% by weight (preferably none or substantially none) of an oil selected from the group consisting of mineral oils, synthetic hydrocarbon oils, and mixtures thereof. the hydraulic fluids thereof preferably comprise a ring base or cyclic tertiary amine with no hydroxyl functionality such as 1,4-dimethyl piperazine.