Non-zinc-based antiwear compositions, hydraulic oil compositions, and methods of using the same

Abstract

The present disclosure provides an antiwear composition including molybdenum dithiocarbamate and an additional antiwear agent including at least one non-zinc-based antiwear additive. The present disclosure further provides a lubricating composition or hydraulic oil that includes at least one lubricating base oil and an antiwear composition (such as, a non-zinc-based or substantially zinc-free antiwear agent) including an effective amount of molybdenum dithiocarbamate. The disclosure also provides methods of making and using the same.

1 . An antiwear composition comprising:
 an effective amount of molybdenum dithiocarbamate; and   an effective amount of at least one non-zinc-based antiwear agent.   
     
     
         2 . The antiwear composition of  claim 1 , wherein the antiwear agent includes at least one of a phosphorous-based antiwear agent, alkyl phosphate or ester thereof, dialkyl dithiophosphate ester, a phosphate-based antiwear agent, salts thereof, or a combination thereof. 
     
     
         3 . The antiwear composition of  claim 1 , wherein the composition is substantially zinc free. 
     
     
         4 . A hydraulic oil composition comprising:
 at least one lubricating base oil; and   an antiwear composition comprising an effective amount of molybdenum dithiocarbamate.   
     
     
         5 . The composition of  claim 4 , wherein the effective amount of the molybdenum dithiocarbamate is no greater than about 0.75 wt. %. 
     
     
         6 . The composition of  claim 4 , wherein the lubricating base oil or oils comprise at least one of: a Group I oil, a Group II oil, a Group III oil, a Group IV oil, a Group V oil, a gas-to-liquid oil, a polyalphaolefin, or combinations thereof. 
     
     
         7 . The composition of  claim 4 , wherein the lubricating base oil or oils include at least one of:
 at least one Group I oil;   at least one Group III oil, or   a combination thereof.   
     
     
         8 . The composition of  claim 4 , further comprising at least one of a dispersant, an additional antiwear agent, a corrosion inhibitor, a rust inhibitor, a detergent, an anti-seizure agent, an antifoam agent or defoamant, a wax modifier, a metal deactivator/passivator, an extreme pressure additive, an antioxidant, a viscosity index improver, a viscosity improver/modifier, a seal compatibility agent, a pour point depressant, a friction modifier, a lubricity agent, an anti-staining agent, a dye or colorant/chromophoric agent, a demulsifier, a wetting agent, an oxidation inhibitor, a tackiness agent, a colorant, a detergent stabilizer, or combinations thereof. 
     
     
         9 . The composition of  claim 4 , wherein the hydraulic oil composition is substantially zinc free. 
     
     
         10 . The composition of  claim 4 , wherein the hydraulic oil composition has reduced wear in at least one of a hydraulic motor, a hydraulic pump, at least a portion of a hydraulic system, or a combination thereof, relative to a hydraulic oil composition that includes a non-zinc-based or zinc-free antiwear composition without molybdenum dithiocarbamate. 
     
     
         11 . The composition of  claim 4 , wherein the hydraulic oil composition provides acceptable wear in the Rexroth Fluid Test Axial Piston Unit Closed Loop test for at least one of a hydraulic pump, a hydraulic motor, at least a portion of a hydraulic system, or a combination thereof. 
     
     
         12 . A method of making a hydraulic oil composition with improved antiwear activity for at least one of a hydraulic pump, a hydraulic motor, at least a portion of a hydraulic system, or a combination thereof compared to a hydraulic oil composition that includes a non-zinc-based or zinc-free antiwear composition without molybdenum dithiocarbamate, the method comprising mixing:
 at least one lubricating base oil; and   an antiwear composition comprising an effective amount of molybdenum dithiocarbamate.   
     
     
         13 . The method of  claim 12 , wherein the effective amount of the molybdenum dithiocarbamate is no greater than about 0.75 wt. %. 
     
     
         14 . The method of  claim 12 , wherein at least one of: the lubricating base oil or oils comprises at least one of:
 a Group I oil, a Group II oil, a Group III oil, a Group IV oil, a Group V oil, a gas-to-liquid oil, a polyalphaolefin, or combinations thereof;   the composition further comprises at least one of a dispersant, an additional antiwear agent, a corrosion inhibitor, a rust inhibitor, a detergent, an anti-seizure agent, an antifoam agent or defoamant, a wax modifier, a metal deactivator/passivator, an extreme pressure additive, an antioxidant, a viscosity index improver, a viscosity improver/modifier, a seal compatibility agent, a pour point depressant, a friction modifier, a lubricity agent, an anti-staining agent, a dye or colorant/chromophoric agent, a demulsifier, a wetting agent, an oxidation inhibitor, a gelling agent, a tackiness agent, a colorant, a detergent stabilizer, or combinations thereof; or   a combination thereof.   
     
     
         15 . A hydraulic oil composition produced according to  claim 12 . 
     
     
         16 . A method for lubricating at least one of a hydraulic motor requiring a hydraulic oil composition, a hydraulic pump requiring the hydraulic oil composition, at least a portion of a hydraulic system requiring the hydraulic oil composition, or a combination thereof, the method comprising:
 supplying the hydraulic motor, pump, the portion of the hydraulic system, or a combination thereof, with a hydraulic oil composition comprising:   at least one lubricating base oil; and   an antiwear composition comprising an effective amount of molybdenum dithiocarbamate.   
     
     
         17 . The method of  claim 16 , wherein the effective amount of the molybdenum dithiocarbamate is no greater than about 0.75 wt. %. 
     
     
         18 . The method of  claim 16 , wherein at least one of:
 the lubricating base oil or oils comprises at least one of: a Group I oil, a Group II oil, a Group III oil, a Group IV oil, a Group V oil, a gas-to-liquid oil, a polyalphaolefin, or combinations thereof;   the composition further comprises at least one of a dispersant, an additional antiwear agent, a corrosion inhibitor, a rust inhibitor, a detergent, an anti-seizure agent, an antifoam agent or defoamant, a wax modifier, a metal deactivator/passivator, an extreme pressure additive, an antioxidant, a viscosity index improver, a viscosity improver/modifier, a seal compatibility agent, a pour point depressant, a friction modifier, a lubricity agent, an anti-staining agent, a dye or colorant/chromophoric agent, a demulsifier, a wetting agent, an oxidation inhibitor, a gelling agent, a tackiness agent, a colorant, a detergent stabilizer, or combinations thereof; or   a combination thereof.   
     
     
         19 . The method of  claim 16 , wherein the lubricating base oil or oils includes at least one of:
 at least one Group I oil,   at least one Group III oil, or   a combination thereof.   
     
     
         20 . The method of  claim 16 , wherein at least one of:
 the antiwear composition is substantially zinc free;   the hydraulic oil composition is substantially zinc-free composition;   the hydraulic oil composition has reduced wear in at least one of a hydraulic motor, a hydraulic pump, at least a portion of a hydraulic system, or a combination thereof, relative to a hydraulic oil composition that includes a non-zinc-based or zinc-free antiwear composition without molybdenum dithiocarbamate;   the hydraulic oil composition provides acceptable wear in (e.g., the hydraulic oil composition passes) the Rexroth Fluid Test Axial Piston Unit Closed Loop test for at least one of a hydraulic pump, a hydraulic motor, at least a portion of a hydraulic system, or a combination thereof; or   a combination thereof.