| 摘要 |
PURPOSE:A high-boiling hydraulic oil suitable for the brake and cratch system of automobiles and compatible with water and glycol, which is prepared by using a specific siloxane-oxyalkylene copolymer as a main agent. CONSTITUTION:Siloxane-oxyalkylene copolymers represented by formulaeI-IV, where R<1> and R<2> are alkyl, halogen-substituted alkyl or phenyl; R<3> is alkyl, halogensubstituted alkyl, phenyl, hydroxyl or alkoxy; G is formula VII, D is a bivalant organic group; R<4> is hydroxyl or a monovalent organic group; n is 2-10; m is 1- 500; x is 0-500; y is 1-500; z is 0-500; and a is 0-1, and contain at least one oxyalkylene group is one molecule. The object hydraulic oil is prepared by adding at least one copolymer of the above-mentioned copolymers in an amount of 1-100%, based on the total amount of hydraulic oil. As other hydraulic oil to be mixed and used together, an oxyalkylene copolymer oil is preferable. |
