Hydraulic system and hydraulic fluid compositions comprising siloxane-oxyalkylene copolymers.

摘要

A hydraulic oil contains 1-100wt.% of one or more of the copolymers of siloxane and oxyalkylene of formulae (I)-(VI). In the formulae, R1, R2 are alkyl, halogenated alkyl or phenyl; R3 is alkyl, halogenated alkyl, phenyl, hydroxyl or alkoxyl; G is -D-(-OCnH2n)m-R4; D is divalent organic gp.; R4 is hydroxyl or univalent organic gp.; n is 2-10; m is 1-500; x is 0-500; y is 1-500; z is 0-500; a is 0 or 1. The other component is a polymer of oxyalkylene. It has high b.pt. and is compatible with water and glycol. It is suitable as the brake oil for motor car.