Water-glycol hydraulic fluid composition and supplementary additive therefor
AssigneeShell Oil Company
InventorHiroshi KANEKO
Life of this patent
Estimating the term…
Abstract
The present invention provides a water-glycol hydraulic fluid composition comprising an alkanolamine compound according to the general formula (1), wherein the water-glycol hydraulic fluid composition comprises 20-60% by mass water, 20-60% by mass glycol, 0.6-1.2% by mass fatty acid lubricant, and 0.01-0.06% by mass alkaline hydroxide compound selected from potassium hydroxide and/or sodium hydroxide, and has an alkali reserve of 10-25, wherein R1 and R2 are hydrocarbon groups having from 1 to 8 carbon atoms, and R3 is a hydrocarbon group having 2 or more carbon atoms.
Claims4
A water-glycol hydraulic fluid composition comprising an alkanolamine compound according to the general formula (1), wherein the water-glycol hydraulic fluid composition comprises 20-60% by mass water, 20-60% by mass glycol, 0.6-1.2% by mass fatty acid lubricant, and 0.01-0.06% by mass alkaline hydroxide compound selected from potassium hydroxide and/or sodium hydroxide, and has an alkali reserve of 10-25,
- wherein R1 and R2 are hydrocarbon groups having from 1 to 8 carbon atoms, and R3 is a hydrocarbon group having 2 or more carbon atoms.
A method for adjusting the alkali reserve of a water-glycol hydraulic fluid composition, said method comprising the addition of a supplementary additive comprising a alkanolamine of general formula (1) to the water-glycol hydraulic fluid to adjust the alkali reserve of the water-glycol hydraulic fluid composition to 10-25 during use
- wherein R1 and R2 are hydrocarbon groups having from 1 to 8 carbon atoms, and R3 is a hydrocarbon group having 2 or more carbon atoms.
Dependencies are inferred from the claim text.