Metalworking fluid compositions and methods of stabilizing same

Details Metalworking fluid compositions and methods of stabilizing same Metalworking fluid compositions and methods of stabilizing same

1976-09-01

1978-12-12

Padgett, Benjamin R.

Compositions

Electrolytes for electrical devices

252 36, 252 497, 72 42, C10M 104, C10M 304

Patent

active

041295099

ABSTRACT:
Stabilized metalworking fluid compositions are disclosed 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 significant economies in metalworking operations.

REFERENCES:
patent: 2744870 (1956-05-01), Stillebroer et al.
patent: 3240701 (1966-03-01), Furia
patent: 3244630 (1966-04-01), Sheikh
patent: 3365397 (1968-01-01), Kolarik
Chemical Abstracts, vol. 75, No. 5, Aug. 2, 1971, p. 164, abstract No. 31794q, Avakyan, Z. et al., "Comparative Toxicity of Free Ions and Copper Complexes with Organic Acids".
Bobtelsky, M. et al., "The Metallic Complexes of Tartrates and Citrates...", in J. Amer. Chem. Soc., vol. 67, pp. 1824-1831, Oct. 1945.

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