Lubricant compositions with improved performance and methods of preparing and using the same

Abstract

The present disclosure relates generally to lubricating compositions and methods of making and using the same. Specifically, the present disclosure relates to lubricating compositions and method of making and using the same for modifying friction at a metal-elastomer contact, and therefore improving at least one of elastomer lifetime, reducing elastomer wear, reducing metal wear, reducing energy consumption or a combination thereof. More specifically, one aspect of the present disclosure relates to lubricating compositions including at least two base oils with a viscosity difference between the first and second base oils; another aspect of the present disclosure relates to lubricating compositions comprising an additive that can modify friction at a metal-elastomer contact.

1 . A lubricating composition for modifying boundary friction at a metal-elastomer contact comprising:
 a base oil blend, wherein the base oil blend comprises at least two base oils, and wherein there is a viscosity difference between the at least two base oils, thereby forming a base oil blend that modifies boundary friction at the metal-elastomer contact relative to a single base stock oil.   
     
     
         2 . The lubricating composition according to  claim 1 , wherein the at least two base oils are synthetic base oils, and the viscosity difference between the at least two base oils is greater than 100 cSt, Kv at 100° C. 
     
     
         3 . The lubricating composition according to  claim 1 , wherein the at least two base oils are mineral base oils, and the viscosity difference between the at least two base oils is greater than 20 cSt, Kv at 100° C. 
     
     
         4 . The lubricating composition according to  claim 1 , wherein at least one base oil is a synthetic base oil and at least one base oil is a mineral base oil, and the viscosity difference between the at least one synthetic oil and the at least one mineral oil is greater than 50 cSt, Kv at 100° C. 
     
     
         5 . The lubricating composition according to  claim 4 , wherein the at least one synthetic base oil include at least one of an alkylated naphthalene base oil, a polyalphaolefin (PAO) base oil, alkylated naphthalene in PAO base oil, or a combination thereof. 
     
     
         6 . The lubricating composition according to  claim 2 , wherein one base oil is selected from the group consisting of PAO 150, PAO 300 and combinations thereof, and a second base oil is selected from the group consisting of PAO 2, PAO 4, PAO, 6, PAO, 8, PAO 10, AN 6, AN12, and combinations thereof. 
     
     
         7 . The lubricating composition according to  claim 1  further comprising one or more lubricating oil additives. 
     
     
         8 . The lubricating composition according to  claim 1 , wherein the base oil blend modifies boundary friction at the metal-elastomer interface by at least 50% as compared to a single base stock oil. 
     
     
         9 . The lubricating composition according to  claim 1 , wherein the base oil blend modifies boundary friction at the metal-elastomer interface by at least 60% as compared to a single base stock oil. 
     
     
         10 . The lubricating composition according to  claim 1 , wherein the base oil blend modifies boundary friction at the metal-elastomer interface by at least 70% as compared to a single base stock oil. 
     
     
         11 . A lubricating composition for reducing boundary friction at a metal-elastomer contact comprising:
 a base oil blend; and   a rust inhibitor or a friction modifier, wherein the rust inhibitor or the friction modifier effectuates the modification of boundary friction at the metal-elastomer contact relative to the base oil blend without the rust inhibitor or the friction modifier.   
     
     
         12 . The lubricating composition of  claim 11 , wherein the rust inhibitor is selected from the group consisting of long chain alkyl phosphonate, dodecyl oleyl succinimide, olely succinimide, stearic acid, neutral calcium sulphonate, and combinations thereof. 
     
     
         13 . The lubricating composition of  claim 11 , wherein the friction modifier is selected from the group consisting of glycerol mono-oleate friction modifier, an ashless amide friction modifier, and combinations thereof. 
     
     
         14 . The lubricating composition according to  claim 11 , wherein the base oil blend modifies boundary friction at the metal-elastomer interface by at least 50% as compared to a single base stock oil. 
     
     
         15 . The lubricating composition according to  claim 11 , wherein the base oil blend modifies boundary friction at the metal-elastomer interface by at least 60% as compared to a single base stock oil. 
     
     
         16 . The lubricating composition according to  claim 11 , wherein the base oil blend modifies boundary friction at the metal-elastomer interface by at least 70% as compared to a single base stock oil. 
     
     
         17 . A method of preparing a lubricating composition for modifying boundary friction at a metal-elastomer contact, the method comprising mixing at least a first base oil, at least a second base oil, and at least one lubricating oil additive, wherein the base oils have a viscosity difference, and wherein the blend effectuates the modification of boundary friction at the metal-elastomer contact relative to a single base stock oil. 
     
     
         18 . The method according to  claim 17 , wherein the at least two base oils are synthetic base oils, and the viscosity difference between the at least two base oils is greater than 100 cSt, Kv at 100° C. 
     
     
         19 . The method according to  claim 17 , wherein the at least two base oils are mineral base oils, and the viscosity difference between the at least two base oils is greater than 20 cSt, Kv at 100° C. 
     
     
         20 . The method according to  claim 17 , wherein at least one base oil is a synthetic base oil and at least one base oil is a mineral base oil, and the viscosity difference between the at least one synthetic oil and the at least one mineral oil is greater than 50 cSt, Kv at 100° C. 
     
     
         21 . The method according to  claim 20 , wherein the at least one synthetic base oil includes at least one of an alkylated naphthalene base oil, a polyalphaolefin (PAO) base oil, alkylated naphthalene in PAO base oil, or a combination thereof. 
     
     
         22 . The method according to  claim 18 , wherein one base oil is selected from the group consisting of PAO 150, PAO 300 and combinations thereof, and a second base oil is selected from the group consisting of PAO 2, PAO 4, PAO, 6, PAO, 8, PAO 10, AN 6, AN12, and combinations thereof. 
     
     
         23 . The method according to  claim 17 , wherein the at least one lubricating oil additive is a rust inhibitor or a friction modifier and the rust inhibitor or the friction modifier further effectuates the modification of boundary friction at the metal-elastomer contact relative to the base oil blend without the rust inhibitor or the friction modifier. 
     
     
         24 . The method according to  claim 23 , wherein the rust inhibitor is selected from the group consisting of long chain alkyl phosphonate, dodecyl oleyl succinimide, olely succinimide, stearic acid, neutral calcium sulphonate, and combinations thereof. 
     
     
         25 . The method according to  claim 23 , wherein the friction modifier is selected from the group consisting of glycerol mono-oleate friction modifier, an ashless amide friction modifier, and combinations thereof.