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.

1 . A metalworking fluid, 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   wherein the metalworking fluid has an air release by ASTM D 3427-03 of less than 0.6 minutes at 50° C., and a sequence II foam tendency by ASTM D 892-03 of less than 50 mL.   
   
   
       2 . The metalworking fluid of  claim 1 , wherein the air release at 50° C. is less than 0.5 minutes. 
   
   
       3 . The metalworking fluid of  claim 1 , wherein the sequence II foam tendency by ASTM D 892-03 is less than 40 mL. 
   
   
       4 . The metalworking fluid of  claim 1 , wherein the sequence II foam tendency by ASTM D 892-03 is less than 20 mL. 
   
   
       5 . The metalworking fluid of  claim 1 , wherein the metalworking fluid has a biodegradability of at least 30% as measured according to OECD 301D. 
   
   
       6 . The metalworking fluid of  claim 1 , wherein the metalworking fluid additionally has a sequence 1 foam tendency by ASTM D 892-03 of less than 50 mL. 
   
   
       7 . The metalworking fluid of  claim 1 , wherein the metalworking fluid has a number of minutes to 3 mL emulsion at 54° C. by ASTM D 1401-02 of less than 30. 
   
   
       8 . The metalworking fluid of  claim 1 , wherein the lubricant base oil is a Fischer-Tropsch derived base oil made from a waxy feed. 
   
   
       9 . The metalworking fluid of  claim 9 , wherein the Fischer-Tropsch derived base oil has a kinematic viscosity at 100° C. between 2 mm 2 /s and 6 mm 2 /s; a kinematic viscosity at 40° C. between 7 mm 2 /s and 20 mm 2 /s; CCS viscosity of less than 2300 mPa·s at −35° C.; a pour point in the range of −20 and −40° C.; a molecular weight of 300-500; a density in the range of 0.800 to 0.820; paraffinic carbon in the range of 93-97%; naphthenic carbon in the range of 3-7%; Oxidator BN of 30 to 60 hours; and Noack volatility in wt. % of 8 to 20 as measured by ASTM D5800-05 Procedure B. 
   
   
       10 . The metalworking fluid of  claim 1 , wherein the lubricant base oil comprises an isomerized based oil and 5 to 20 wt. % of at least one of mineral oils, synthetic hydrocarbon oils or synthetic ester oils and mixtures thereof. 
   
   
       11 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has an average molecular weight between 600 and 1100, and an average degree of branching in the molecules between 6.5 and 10 alkyl branches per 100 carbon atoms. 
   
   
       12 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has a wt % Noack volatility between 0 and 100. 
   
   
       13 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has an auto-ignition temperature (AIT) greater than an amount defined by: 1.6×(Kinematic Viscosity at 40° C., in mm 2 /s)+300. 
   
   
       14 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has an auto-ignition temperature (AIT) greater than 329° C. 
   
   
       15 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has a viscosity index greater than 28×Ln (Kinematic Viscosity at 100° C., in mm 2 /s)+300. 
   
   
       16 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has a ratio of weight percent molecules with monocycloparaffinic functionality to weight percent molecules with multicycloparaffinic functionality of greater than 15. 
   
   
       17 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has a total weight percent of molecules with cycloparaffinic functionality of greater than 10, and a ratio of weight percent molecules with monocycloparaffinic functionality to weight percent molecules with multicycloparaffinic functionality of greater than 15. 
   
   
       18 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has a Kinematic Viscosity at 100° C. of >1.808 mm 2 /s and a Noack volatility less than an amount calculated by: 1.286+20 (Kinematic Viscosity at 100° C.) −1.5 +551.8 Ln (Kinematic Viscosity at 100° C.). 
   
   
       19 . The metalworking fluid of  claim 1 , wherein the lubricant base oil comprises greater than 3 weight % molecules with cycloparaffinic functionality and less than 0.30 weight percent aromatics. 
   
   
       20 . The metalworking fluid of  claim 1 , wherein the lubricant base oil greater than 10 wt. % and less than 70 wt. % total molecules with cycloparaffinic functionality 
   
   
       21 . The metalworking fluid of  claim 1 , wherein the lubricant base oil has a traction coefficient of less than 0.023 when measured at a kinematic viscosity of 15 mm 2 /s and at a slide to roll ratio of 40%.