Water-glycol hydraulic fluid
AssigneeShell USA, Inc.
InventorHiroshi Kaneko
Life of this patent
Estimating the term…
Abstract
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.
Claims2
A water-glycol hydraulic fluid comprising:
- from 20 to 60% by mass of water and from 20 to 60% by mass of glycol;
- 0.2% by mass or more and 0.6% by mass or less of a dimer acid as a fatty acid lubricant, wherein the dimer acid is a dibasic acid of a dicarboxylic acid having 36 carbon atoms;
- and
- from 0.15% to 0.20% by mass of a phosphoric acid ester represented by general formula (1) below,
- 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, and wherein
- the sum of the dimer acid and the phosphoric acid ester is more than 0.35% by mass.
Dependencies are inferred from the claim text.