HYDRAULIC FLUID COMPOSITION

摘要

PURPOSE:To provide a hydraulic fluid compsn. having low hygroscopicity and exhibiting low dynamic viscosity when it absorbs moisture, by mixing a particular polyoxyalkylene glycol monobenzyl ether with a polyoxyalkylene glycol monoalkyl ether. CONSTITUTION:A desired hydraulic fluid compsn. is prepd. by mixing 20-90wt.% polyoxyalkylene glycol monobenzyl ether (A) of formula I (wherein R1 and R2 are each ethylene or propylene; and n and m are each 0-6) having a an average number of alkylene oxide units added of 0.5-1.8 with 80-10wt.% polyoxyalkylene glycol monoalkyl ether (B) of formula II (where R1' and R2' are each ethylene or propylene; R3 is H or 1-4C alkyl; and k and l are each 0-5). This compsn. has low hygroscopicity and excellent stability, which renders it suitable for use in hydraulic brakes, clutch systems, etc.