Non-staining, active metal-working fluid
AssigneeHenkel Loctite Corporation
InventorEdward A. Y. Fisher
Life of this patent
Estimating the term…
Abstract
Non-staining, active metal-working compositions are disclosed. The compositions contain active sulfur to provide extreme pressure properties for metal-working fluids. A metal corrosion inhibitor is disclosed that reduces the corrosivity of free sulfur on non-ferrous metallic objects.
Claims19
A composition for lubricating metallic work pieces comprising:
- (a) an oil having a viscosity of about 75 cSt to about 90 cSt at 25° C.;
- (b) free sulfur in an amount sufficient to provide lubrication, and
- (c) a metal corrosion inhibitor to prevent corrosion of said work pieces;
- wherein said metal corrosion inhibitor is a fatty oil selected from the group consisting of a glyceride, an ester of a carboxylic acid, and combinations thereof, wherein said glyceride is represented by the formula of
- wherein R1 is a saturated or unsaturated C3 to C24 aliphatic hydrocarbon, and R2 or R3 is hydrogen or
- wherein R1 is as defined above, and said ester is represented by the formula of
- wherein R4 is hydrogen or a saturated or unsaturated C3 to C12 aliphatic hydrocarbon, X is 1, 2 or 3, R5 is a saturated or unsaturated C3 to C24 aliphatic hydrocarbon, and R6 is represented by the formula of
- wherein R5 is as defined above;
- and
- wherein said lubrication is demonstrated by a Falex reference load of greater than about 4,500 pounds force and by a Falex reference wear of less than ten teeth and further wherein said composition when maintained at 100° C. for 2 hours has a copper strip corrosion classification from about 1a to about 3b.
A composition for lubricating nonferrous metallic work pieces comprising:
- (a) an oil having a viscosity of about 75 cSt to about 90 cSt at 25° C. suitable for heavy duty metalworking operations;
- and
- (b) free sulfur being present in amounts of about 0.4 percent to about 12 percent by weight of said composition;
- wherein said composition does not corrode said nonferrous work pieces and further wherein said composition when maintained at 100° C. for 2 hours has a copper strip corrosion classification from about 1a to about 3b.
A method of making a composition which provides non-corrosive lubrication to nonferrous metalworking processes comprising:
- selecting a base oil having a viscosity of about 75 cSt to about 90 cSt at 25° C.;
- incorporating chemically unbound sulfur to said base oil to provide an extreme pressure lubricant, wherein the chemically unbound sulfur is from about 0.4 to about 12 weight percent of said composition;
- and
- further incorporating a fatty oil to inhibit nonferrous metal corrosion.
A method of providing noncorrosive lubrication to the metalworking of a nonferrous metal part comprising:
- providing a composition which includes a base oil having a viscosity of about 75 cSt to about 90 cSt at 25° C. and free sulfur present in amounts sufficient to provide extreme pressure lubrication of a Falex reference load of greater than about 4,500 pounds force, wherein said composition when maintained at 100° C. for 2 hours has a copper strip corrosion classification from about 1a to about 3b;
- and
- applying said composition to the metal work part and/or a metal work tool during the metalworking process.
A composition for lubricating comprising:
- (a) an oil having a viscosity of about 75 cSt to about 90 cSt at 25° C.;
- (b) free sulfur in an amount sufficient to provide enhanced extreme pressure lubrication, and
- (c) a metal corrosion inhibitor to prevent corrosion of said work pieces, wherein said lubrication is demonstrated by a Four-Ball wear scar diameter of less than about 0.07 mm.
Dependencies are inferred from the claim text.