润滑科技信息平台

专利摘要

This invention provides a water-glycol hydraulic fluid comprises from 0.2 to 0.6% by mass of a dimer acid as a fatty acid lubricant, and more than 0.10% by mass and 0.20% by mass or less of a phosphoric acid ester of Formula (1), wherein the sum of the dimer acid and the phosphoric acid ester is more than 0.35% by mass wherein R1 and R2 may be the same or different, each representing a hydrogen atom or a hydrocarbon group having from 1 to 30 carbon atoms, R3 represents a hydrocarbon group having from 1 to 20 carbon atoms, R4 represents a hydrogen atom or a hydrocarbon group having from 1 to 30 carbon atoms, and X1, X2, X3 and X4 may be the same or different, each representing an oxygen atom or a sulfur atom. ......

基本信息

专利类型:
发明专利
申请/专利号:
EP2021809999
申请日期:
2021-11-09
专利申请人:
国际壳牌研究有限公司
分类号:
["C10M173/00","C10M173/02"]
发明/设计人:
KANEKO, HIROSHI
权利要求: C L A I M S1. A water-glycol hydraulic fluid comprising: from 20 to 60% by mass of water;0.2% by mass or more and 0.6% by mass or less of a dimer acid as a fatty acid lubricant; and more than 0.10% by mass and 0.20% by mass or less of a phosphoric acid ester represented by general formula (1) below,wherein Ri and R2 may be the same or different, each representing a hydrogen atom or a hydrocarbon group having from 1 to 30 carbon atoms, R3 represents a hydrocarbon group having from 1 to 20 carbon atoms, R4 represents a hydrogen atom or a hydrocarbon group having from 1 to 30 carbon atoms, and Xi, X2, X3 and X4 may be the same or different, each representing an oxygen atom or a sulfur atom, and wherein the sum of the dimer acid and the phosphoric acid ester is more than 0.35% by mass.2. A water-glycol hydraulic fluid according to claim 1, wherein Xi and X2 in the phosphoric acid ester are oxygen atoms, X3 and X4 are sulfur atoms, and R3 is -CH(CH3) - or - CH2-CH2- .3. A water-glycol hydraulic fluid according to claim 1 or 2, wherein the amount of phosphoric acid ester is from 0.15 mass% to 0.20 mass%.