Metalworking fluid compositions and preparation thereof

Abstract

A metalworking fluid composition comprising an isomerized base oil having consecutive numbers of carbon atoms and less than 10 wt % naphthenic carbon by n-d-M is provided. The metalworking fluid has reduced mist formation, low foaming tendency and excellent air release properties, and excellent wear properties.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of copending application Ser. Nos. 11 / 831,910, filed Jul. 31, 2007, Ser. No. 11 / 831,896, filed Jul. 31, 2007 and Ser. No. 13 / 045,816, filed Mar. 11, 2011 and claims priority therefrom.TECHNICAL FIELD[0002]The invention relates generally to metalworking compositions exhibiting improved anti-mist properties, having a low foaming tendency excellent air release properties, and excellent wear properties.BACKGROUND[0003]In industrial metal cutting operations or in the semiconductor industry for cutting silicon wafers, machining or metalworking fluids are employed. Metalworking fluids are used as cutting oils, rolling oils, drawing oils, pressing oils, forging oils, abrasive working oils for aluminium disks, abrasive oils for silicon wafers and coolants. In high-speed machining operations that require rapid fluid application and recirculation, foam and air entrainment are sometimes experienced with unde...

AI Technical Summary

Benefits of technology

[0009]In another aspect, there is provided a method to reduce the mist formation in a metalworking fluid, the method comprising blending a composition comprising a lubricant base oil having consecutive numbers of carbon atoms and less than 10 wt % naphthenic carbon by n-d-M; and 0.10 to 10 wt. %. of at least an additive selected from the group of a metalworking fluid additive package; metal deactivators; corrosion inhibitors; antimicrobial; anticorrosion; extreme pressure agents; antifriction; antirust agents; polymeric substances; anti inflammatory agents; bactericides; antiseptics; antioxidants; chelating agents such as edetic acid salts, and the like; pH regulators; antiwear agents; and mixtures thereof, for a metalworking fluid having an average mist accumulation rate of less than 300 mg / mm3 within 30 seconds after start in an aerosol mist formation test

Problems solved by technology

In high-speed machining operations that require rapid fluid application and recirculation, foam and air entrainment are sometimes experienced with undesirable results.

Foaming is undesirable because it may reduce cooling at the workpiece-tool contact zone and causes containment transport and control problems.

The use of certain foam control agent(s) such as such as silicon-based foam inhibitors leaves residues on machined parts, making it rather difficult to subsequently paint the parts.

Additionally for some foam control agent(s), their use is generally found to worsen the metalworking fluid's air release properties.

Poor air release properties can lead to air entrainment issues and cavitation.

Besides the foaming problem, there is a different problem often associated in the use of the metalworking fluids that is of fog or mist generation.

While metal cutting fluids in the prior art are essential for metal forming and machining, they are currently being examined with increased scrutiny because of possible hazards associated with worker exposure.

Some metal cutting fluids in the prior art with the use of various additives pose environmental problems associated with their disposal.

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