Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1996-03-05
1998-01-13
McAvoy, Ellen M.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
72 42, 252 79, C10M10536, C10M10734
Patent
active
057079455
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/EP94/03004, filed Sep. 8, 1994, now WO95/07961.
1. Field of Invention
The present invention relates to a base fluid for hydraulic or metal working fluids comprising an effective amount of a specific esterification product. By "hydraulic fluid" is understood throughout this specification and the attached claims fluids which are used in hydraulic machinery, such as brake mechanisms, shock absorbers, automatic transmission of motor vehicles, control mechanisms and similarly operated hydraulic mechanisms. These hydraulic fluids may also be in the form of water and oil emulsions.
By "metal working fluid" is understood throughout this specification and the attached claims fluids which are used in machining and working operations of in particular (but not exclusively) metals, such as turning, milling, drilling, grinding, punching, deep drawing and the like operations. These metal working fluids may also be in the form of water and oil emulsions.
2. Background of Invention
Base fluids for hydraulic fluids should meet various requirements, such as good lubricity, good compatability with other commercially available hydraulic fluids, very little swelling effect on (synthetic) rubber, not agressive towards metals, a high boiling or flash point, a freezing point which is as low as possible, environmentally safe (preferably biodegradable) and it should neither in vapour form nor in liquid form have a detrimental effect on the health. It will be clear that such a variety of requirements, which sometimes may even be conflicting, is very difficult to meet.
In the past base fluids on the basis of poly(alkylene) glycols have been proposed for hydraulic fluids, but these are hygroscopic and due to the water absorption from the environment, the flash point is lowered. It has also been proposed in U.S. Patent Specification U.S. Pat. No. 2,755,251 (Atlas Powder Comp.) to formulate a hydraulic fluid using C.sub.3 -C.sub.10 aliphatic glycols, C.sub.4 -C.sub.8 monoalkyl glycol ethers and a reaction product of linoleic dimer acid and 20-35 moles of propylene oxide as the base fluid, but these products are still hygroscopic.
In German Patent Application DE-A-2,426,925 (Institut Francais du Petrole) there has been described the addition of 10-40 wt % of an ester of dimer or trimer acid with a mixture of 15-99% mole of a monohydroxy ether from the condensate of 2-50 moles of a C.sub.2 -C.sub.5 alkylene oxide with a C.sub.1 -C.sub.25 aliphatic monohydric alcohol and 85-1 mole % of an aliphatic C.sub.1 -C.sub.25 monohydric alcohol, to a solvent refined paraffinic lubrication oil. These complex esters are stated to improve the viscosimetric properties of the lubrication oil, so that its incorporation therein enables the manufacture of general purpose motor oils.
Further such metal working fluids have been disclosed in American Patent Specification U.S. Pat. No. 4,172,802 (Cincinnati Milacron Inc.) in which metal working fluid compositions have been described, comprising water and a carboxylic acid group terminated diester of dimerized or trimerized C.sub.8 -C.sub.26 unsaturated fatty acids and a polyoxyalkylene diol having two terminal secondary alcohol groups, or the alkali metal salt or organic amine salt of said diester.
SUMMARY OF INVENTION
It has now been found that the esterification product of polymerized unsaturated C.sub.12 -C.sub.24 fatty acids with a monohydric alkoxylated alcohol, optionally in admixture with a saturated monohydric alcohol, is an excellent base fluid for hydraulic fluids or metal working fluids and can be used as such or in effective amounts in conventional hydraulic fluids or metal working fluids, which can also be in the form of an oil and water emulsion.
Therefore, the present invention relates to a base fluid for hydraulic or metal working fluids comprising the esterification product, having an acid number below 10 and a hydroxyl number below 15, obtained by esterification of: the group consisting of dimer acid, trimer acid, hydrogenated
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Database WPI, Week 9012, Derwent Publications Ltd., London, GB.
Cooban Nigel Andrew John
Rieffe Hendrik Leendert
McAvoy Ellen M.
Unichema Chemie B. V.
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