Metalworking fluid compositions and methods of stabilizing same

C - Chemistry – Metallurgy – 10 – M

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253/125, 253/28,

C10M 173/02 (2006.01) C10M 173/00 (2006.01)

Patent

CA 1087156

METALWORKING FLUID COMPOSITIONS AND METHODS OF STABILIZING SAME Abstract of the Disclosure Stabilized metalworking fluid compositions are dis- closed comprising an oil and water dispersion and, as a stabilizer therefor, a metal complex of a metal ion and a polyfunctional organic ligand. The metal complexes have an aqueous proton induced dissociation property represented by a sigmoidally-shaped curve on a cartesian coordinate plot of the negative log of the metal ion concentration versus the negative log of hydrogen ion concentration. This dissociation property causes a controlled release of metal ion into the oil and water dispersion to impart metal working stability to the dispersion. Metal working emulsions of oil and water are stabilized by the addition thereto of minor amounts of a metal complex, e.g., disodium monocopper(II) citrate, which at alkaline pH metalworking conditions above about 7 to about 9 releases metal cations to the emulsions imparting stabilizing characteristics which prevent emulsion degradation by a number of factors commonly encountered in metalworking operations. The stabilized compositions of this invention have greatly improved service life and offer signifi- cant economies in metalworking operations.

284787

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