Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1995-12-01
1997-11-18
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
72 42, 560198, 560200, 560224, C10M10734, C10M14538
Patent
active
056887507
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/EP94/01634 filed May 11, 1994.
The present invention relates to a base fluid for a metal working fluid, which comprises a salt of an esterification product. The present invention also relates to novel alkali metal and alkanol amine salts of specific partial esters.
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 usually are in the form of water and oil emulsions.
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.
These compositions are said to have a high resistance to hydrolysis also upon prolonged storage, but the disadvantage of esters of this type is that due to the bifunctionality of the constituent acid and alcohol highly viscous products are obtained, and if salts of partial esters are formed, the viscosity increases even further as a result of this salt formation.
In U.S. Pat. No. 4,172,802 no examples of the formation of the partial esters or their salts have been given and also it has not been indicated what acid and/or hydroxyl numbers the esterification products exhibit.
It has now been found that salts of specific partial esters of polymerized unsaturated C.sub.12 -C.sub.24 fatty acids with a monohydric alkoxylated alcohol are excellent base fluids for metal working fluids and can be used in effective amounts in conventional metal working fluids, which preferably are in the form of an oil and water emulsion, which may have a transparent or preferably a milky appearance. It has particularly been found that the oil and water emulsions comprising the salts of the specific partial esters according to the present invention after their use can easily be broken by a reduction of their pH value. In the subsequent waste water treatment lower C.O.D. values for the waste water are required and hence a more economic waste water treatment is possible.
Therefore, the present invention relates to a base fluid for metal working fluids comprising a salt of the esterification product obtained by partial esterification of: the group consisting of dimer acid, trimer acid, hydrogenated dimer acid, hydrogenated trimer acid, and mixtures thereof, and to 24 carbon atoms which are alkoxylated with from 2 to 25 moles of a C.sub.2 -C.sub.5 alkylene oxide, groups is etherified with a C.sub.1 -C.sub.4 aliphatic monohydric alcohol and which is alkoxylated with from 2 to 25 moles of a C.sub.2 -C.sub.5 alkylene oxide, and mixtures of (1) and (2), and optionally monohydric alcohol having from 1 to 24 carbon atoms, after which the said partial ester is: neutralizing agent, selected from the group consisting of ammonium hydroxide, the alkali metal hydroxides, the alkyl amines, the alkanol amines, and mixtures thereof.
The polymerized unsaturated C.sub.12 -C.sub.24 fatty acids are selected from the group consisting of dimer acid (such as PRIPOL 1013, 1017 or 1022 (Trade Mark) ex Unichema Chemie BV, Gouda, The Netherlands), trimer acid, hydrogenated dimer acid (such as PRIPOL 1009 or 1025 (Trade Mark) ex Unichema Chemie BV, Gouda, The Netherlands), hydrogenated trimer acid and mixtures thereof. If need be the dimer and trimer acids may be distilled prior to or after their hydrogenation. The use of trimer acid (such as PRIPOL 1040 (Trade Mark) ex Unichema Chemie BY, Gouda, The Netherlands), is preferred.
The monohydric alkoxylated alcohol may be selected from the group consisting of: to 24 carbon
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Cooban Nigel Andrew John
Rieffe Hendrik Leendert
Howard Jacqueline V.
Unichema Chemie B. V.
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