Evaporative n-propyl bromide-based machining fluid formulations

Abstract

Disclosed is a machining fluid admixture for cooling and lubricating a workpiece/tool interface, wherein the admixture comprises a major amount of n-propyl bromide and a minor amount of a lubricant. In other embodiments, the machining fluid consists essentially of about 30.0 to about 99.99 weight percent n-propyl bromide; from about 0.01 to about 30.0 weight percent of a lubricant; and optionally from 0.0 to about 70.0 weight percent of a fluorinated chemical. In still further embodiments, the machining fluid consists essentially of about 45.0 to about 50.0 weight percent n-propyl bromide; from about 0.01 to about 2.0 weight percent of a lubricant; and from 45.0 to about 50.0 weight percent of a fluorinated chemical. In other aspects, the present invention is directed to methods for cooling and lubricating a tool/workpiece interface. The methods comprise the steps of applying an effective amount of the n-propyl bromide-based machining formulations as disclosed herein to a part during a machining operation so as to cool and lubricate the tool/workpiece interface.

1 . A machining fluid admixture for cooling and lubricating a workpiece/tool interface, the machining fluid admixture comprising: 
 a major amount of n-propyl bromide; and    a minor amount of a lubricant.    
     
     
         2 . The machining fluid admixture of  claim 1  wherein the lubricant is in an amount that ranges on a weight percent basis from about 0.01% to about 30% of the machining fluid admixture.  
     
     
         3 . The machining fluid admixture of  claim 1  wherein the lubricant is in an amount that ranges on a weight percent basis from about 0.01% to about 10% of the machining fluid admixture.  
     
     
         4 . The machining fluid admixture of  claim 1  wherein the lubricant is in an amount that ranges on a weight percent basis from about 1.0% to about 3.0% of the machining fluid admixture.  
     
     
         5 . The machining fluid admixture of  claim 1  wherein the lubricant is a mineral oil, a synthetic lubricating oil, or a mixture thereof.  
     
     
         6 . The machining fluid admixture of  claim 1  wherein the lubricant is a synthetic lubricating oil.  
     
     
         7 . The machining fluid admixture of  claim 6  wherein the synthetic lubricating oil is a non-halogenated synthetic lubricating oil.  
     
     
         8 . The machining fluid admixture of  claim 6  wherein the synthetic lubricating oil is a polyol ester, a polyalkylene glycol, a glycol ether, an isoparaffin, or mixture thereof.  
     
     
         9 . The machining fluid admixture of  claim 8  wherein the polyalkylene glycol is ethylene glycol monobutyl ether, propylene glycol methyl ether, or a mixture thereof.  
     
     
         10 . The machining fluid admixture of  claim 6  wherein the synthetic lubricating oil is an isoparaffin.  
     
     
         11 . The machining fluid admixture of  claim 10  wherein the isoparaffin is 2,2,4-trimethylpentane.  
     
     
         12 . The machining fluid admixture of  claim 6  wherein the synthetic lubricating oil is a polyol ester.  
     
     
         13 . The machining fluid admixture of  claim 6  further comprising a fluorinated chemical.  
     
     
         14 . The machining fluid admixture of  claim 13  wherein the fluorinated chemical has the formula of C a F b H c N d O e  wherein 2≦a≦8, 5≦b≦18, 0≦c≦13, 0≦d≦2 and 0≦e≦2.  
     
     
         15 . The machining fluid admixture of  claim 13  wherein the fluorinated chemical is 1,1,1,2,3,4,4,5,5,5-decafluoropentane, 1-methoxy-nonafluorobutane, or a mixture thereof.  
     
     
         16 . A composition useful as a machining fluid, the composition consisting essentially of: 
 from about 30.0 to about 99.99 weight percent n-propyl bromide;    from about 0.01 to about 30.0 weight percent of a lubricant; and optionally    from 0.0 to about 70.0 weight percent of a fluorinated chemical.    
     
     
         17 . The composition of  claim 16  wherein the lubricant is a synthetic lubricating oil.  
     
     
         18 . The composition of  claim 17  wherein the synthetic lubricating oil is a non-halogenated synthetic lubricating oil.  
     
     
         19 . The composition of  claim 17  wherein the synthetic lubricating oil is a polyol ester, a polyalkylene glycol, a glycol ether, an isoparaffin, or mixture thereof.  
     
     
         20 . The composition of  claim 19  wherein the polyalkylene glycol is ethylene glycol monobutyl ether, propylene glycol methyl ether, or a mixture thereof.  
     
     
         21 . The composition of  claim 17  wherein the synthetic lubricating oil is an isoparaffin.  
     
     
         22 . The composition of  claim 21  wherein the isoparaffin is 2,2,4-trimethylpentane.  
     
     
         23 . The composition of  claim 17  wherein the synthetic lubricating oil is a polyol ester.  
     
     
         24 . The composition of  claim 16  wherein the fluorinated chemical has the formula of C a F b H c N d   0   e  wherein 2≦a≦8, 5≦b≦18, 0≦c≦13, 0≦d≦2 and 0≦e≦2.  
     
     
         25 . The composition of  claim 16  wherein the fluorinated chemical is 1,1,1,2,3,4,4,5,5,5-decafluoropentane, 1-methoxy-nonafluorobutane, or a mixture thereof.  
     
     
         26 . A machining fluid composition consisting essentially of: 
 about 45.0 to about 50.0 weight percent n-propyl bromide;    about 0.01 to about 2.0 weight percent of a lubricant; and    about 45.0 to about 50.0 weight percent of a fluorinated chemical.    
     
     
         27 . The machining fluid composition of  claim 26  wherein the lubricant is a polyol ester, a polyalkylene glycol, a glycol ether, an isoparaffin, or mixture thereof.  
     
     
         28 . The machining fluid composition of  claim 27  wherein the polyalkylene glycol is ethylene glycol monobutyl ether, propylene glycol methyl ether, or a mixture thereof.  
     
     
         29 . The machining fluid composition of  claim 26  wherein the synthetic lubricating oil is an isoparaffin.  
     
     
         30 . The machining fluid composition of  claim 29  wherein the isoparaffin is 2,2,4-trimethylpentane.  
     
     
         31 . The machining fluid composition of  claim 26  wherein the synthetic lubricating oil is a polyol ester.  
     
     
         32 . A method for cooling and lubricating a tool/workpiece interface, the method comprising applying an effective amount of a composition formulated in accordance with  claim 1 ,  claim 16 , or  claim 26  so as to cool and lubricate the tool/workpiece interface.