TBN and Performance Booster

Abstract

A lubricating oil composition including greater than 50% by weight of a base oil, based on the total weight of the lubricating oil composition and an additive for boosting the TBN of the lubricating oil without increasing the sulphated ash content. Also disclosed is a method for boosting the TBN of the lubricating oil composition as measured by both ASTM D-2896 and ASTM D-4739 without increasing the sulphated ash content by adding a TBN booster. The TBN booster can also be employed to improve results for the lubricating oil composition in a ball rust test and certain of the TBN boosters exhibit outstanding seal compatibility.

1 . A lubricating oil composition comprising:
 a) greater than 50% by weight of a base oil, based on the total weight of the lubricating oil composition; and   b) an additive selected from the group consisting of:
 i) a reaction product of a dicyclohexyl carbodiimide with a primary or a secondary amine; and 
 ii) at least one compound of the Formula (I): 
   
       
         
           
           
               
               
           
         
       
       wherein R′, R″, and R′″ are independently selected from the group consisting of hydrogen and hydrocarbyl groups containing 1-50 carbon atoms. 
     
     
         2 . The lubricating oil composition as claimed in  claim 1 , wherein the additive is the reaction product of the dicyclohexyl carbodiimide with the primary or secondary amine. 
     
     
         3 . The lubricating oil composition as claimed in  claim 2 , wherein the reaction product is the reaction product of the dicyclohexyl carbodiimide with the primary amine. 
     
     
         4 . The lubricating oil composition as claimed in  claim 2 , wherein the reaction product is the reaction product of the dicyclohexyl carbodiimide with the secondary amine. 
     
     
         5 . The lubricating oil composition as claimed in  claim 1 , wherein the additive is one compound of the Formula (I). 
     
     
         6 . The lubricating oil composition as claimed in  claim 5 , wherein R′ is an alkyl group having from about 4 to about 15 carbon atoms. 
     
     
         7 . The lubricating oil composition as claimed in  claim 5 , where R″ is a hydrocarbyl group having from about 6 to about 12 carbon atoms and R′″ is a hydrocarbyl group having from about 6 to about 12 carbon atoms. 
     
     
         8 . The lubricating oil composition as claimed in  claim 5 , wherein the compound of Formula (I) is selected from the group consisting of N-dodecyl-N′N″-dicyclohexylguanidine, N-2-ethylhexyl-N′, N″-dicyclohexylguanidine, N-benzyl-N′,N″-dicyclohexylguanidine, N-cyclohexyl-N′-dicyclohexyl-N″-cyclohexylguanidine, N,N-dihexyl-N′,N″-dicyclohexylguanidine and N-oleyl-N′,N″-dicyclohexylguanidine. 
     
     
         9 . The lubricating oil composition as claimed in  claim 1 , wherein the lubricating oil composition further comprises an overbased calcium sulfonate detergent. 
     
     
         10 . The lubricating oil composition as claimed in  claim 9 , wherein the lubricating oil composition comprises no more than 2 wt. % of an overbased calcium detergent based on the total weight of the lubricating oil composition and the lubricating oil composition has a total sulfated ash content of about 2 wt. % or less, or about 1.5 wt. % or less, based on the total weight of the lubricating oil composition. 
     
     
         11 . The lubricating oil composition as claimed in  claim 1 , wherein the lubricating oil composition comprises a sufficient amount of the reaction product or the compound of the Formula (I) to boost the TBN of the lubricating composition by from about 0.2 to about 2, or from about 0.4 to about 1.5, or from about 0.5 to about 1.2, wherein the TBN boost is determined using the TBN measurement method of ASTM D-4739. 
     
     
         12 . The lubricating oil composition as claimed in  claim 1 , wherein the lubricating oil composition comprises from about 0.01 to about 2 wt. % of the reaction product or the compound of the Formula (I), or from about 0.1 to about 1.8 wt. % or from about 0.25 to about 1.5 wt. %, based on the total weight of the lubricating oil composition. 
     
     
         13 . The lubricating oil composition as claimed in  claim 1 , wherein lubricating oil composition is an engine oil composition and the base oil is selected from the group consisting of Group II, Group III, Group IV, Group V base oils having at least 90% saturates, and any mixture thereof. 
     
     
         14 . The lubricating oil composition as claimed in  claim 1 , wherein the lubricating oil composition further comprises at least one additive selected from the group consisting of antioxidants, antifoam agents, molybdenum-containing compounds, titanium-containing compounds, phosphorus-containing compounds, viscosity index improvers, pour point depressants, and diluent oils. 
     
     
         15 . A lubricating oil composition comprising:
 a) greater than 50% by weight of a base oil, based on the total weight of the lubricating oil composition; and   b) an additive selected from the group consisting of:
 i) a reaction product of N,N-dimethyl-1,3-propanediamine with at least one compound of the following Formulas (II)-(III): 
   
       
         
           
           
               
               
           
         
         
            wherein R 1  is selected from a hydrocarbyl group of 1-50 carbon atoms, R 2  is selected from hydrogen, or a hydrocarbyl group of 1-50 carbon atoms; and in the compounds of the Formula (III) n is selected to provide a total number average molecular weight of from about 10,000 to about 70,000, or from about 20,000 to about 60,000, or from about 30,000 to 50,000; 
           ii) at least one compound of the following Formulas (IV)-(V): 
         
       
       
         
           
           
               
               
           
         
         
            wherein R 1  is selected from a hydrocarbyl group of 1-50 carbon atoms and R 2  is selected from hydrogen, or a hydrocarbyl group of 1-50 carbon atoms, R 7  is an amino group and in the compounds of the Formula (IV) n is selected such that the compounds have a total number average molecular weight Mw of 10,000 to 70,000, or from about 20,000 to about 60,000, or from about 30,000 to 50,000; and 
           iii) a compound of the Formula (VI) 
         
       
       
         
           
           
               
               
           
         
       
       wherein R5 is a hydrocarbyl group having 1-20 carbon atoms. 
     
     
         16 . A method for boosting TBN as measured by both ASTM D-2896 and ASTM D-4739 without increasing the ash content of a lubricating composition, comprising the step of adding to the lubricating oil composition an additive selected from the group consisting of:
 i) a reaction product of a dicyclohexyl carbodiimide with a primary or a secondary amine; and   ii) at least one compound of the Formula (I):   
       
         
           
           
               
               
           
         
       
       wherein R′, R″, and R′″ are independently selected from the group consisting of hydrogen and hydrocarbyl groups containing 1-50 carbon atoms. 
     
     
         17 . The method as claimed in  claim 16 , wherein a boost in the TBN as measured by ASTM D-4739 is from about 0.2 to about 2, or from about 0.4 to about 1.5, or from about 0.5 to about 1.2. 
     
     
         18 . A method for improving the performance as measured by a Ball Rust Test in an engine, comprising the step of adding to the lubricating oil composition an additive selected from the group consisting of:
 i) a reaction product of a dicyclohexyl carbodiimide with a primary or a secondary amine; and   ii) at least one compound of the Formula (I):   
       
         
           
           
               
               
           
         
       
       wherein R′, R″, and R′″ are independently selected from the group consisting of hydrogen and hydrocarbyl groups containing 1-50 carbon atoms. 
     
     
         19 . The method as claimed in  claim 18 , wherein the improvement in the performance in the Ball Rust Test is determined relative to a same lubricating composition in the absence of the TBN booster. 
     
     
         20 . A method for boosting TBN as measured by both ASTM D-2896 and ASTM D-4739 without increasing the ash content of a lubricating composition, comprising the step of adding to the lubricating oil composition an additive selected from the group consisting of:
 i) a reaction product of N,N-dimethyl-1,3-propanediamine with at least one compound of the following Formulas (II)-(III):   
       
         
           
           
               
               
           
         
       
       wherein R 1  is selected from a hydrocarbyl group of 1-50 carbon atoms, R 2  is selected from hydrogen, or a hydrocarbyl group of 1-50 carbon atoms; and in the compounds of the Formula (III) n is selected to provide a total number average molecular weight of 10,000 to 70,000, or from about 20,000 to about 60,000, or from about 30,000 to 50,000;
 ii) at least one compound of the following Formulas (IV)-(V): 
 
       
         
           
           
               
               
           
         
       
       wherein R 1  is selected from a hydrocarbyl group of 1-50 carbon atoms and R 2  is selected from hydrogen, or a hydrocarbyl group of 1-50 carbon atoms, R 7  is an amino group and in the compounds of the Formula (IV) n is selected such that the compounds have a total number average molecular weight Mw of 10,000 to 70,000, or from about 20,000 to about 60,000, or from about 30,000 to 50,000; and
 iii) a compound of the Formula (VI) 
 
       
         
           
           
               
               
           
         
       
       wherein R5 is a hydrocarbyl group having 1-20 carbon atoms. 
     
     
         21 . The method as claimed in  claim 20 , wherein a boost in the TBN as measured by ASTM D-4739 is from about 0.2 to about 2, or from about 0.4 to about 1.5, or from about 0.5 to about 1.2. 
     
     
         22 . A method for boosting the performance as measured by a Ball Rust Test in an engine, comprising the step of adding to the lubricating oil composition an additive selected from the group consisting of:
 i) a reaction product of N,N-dimethyl-1,3-propanediamine with at least one compound of the following Formulas (II)-(III):   
       
         
           
           
               
               
           
         
       
       wherein R1 is selected from a hydrocarbyl group of 1-50 carbon atoms, R2 is selected from hydrogen, or a hydrocarbyl group of 1-50 carbon atoms; and in the compounds of the Formula (III) n is selected to provide a total number average molecular weight of 10,000 to 70,000, or from about 20,000 to about 60,000, or from about 30,000 to 50,000;
 ii) at least one compound of the following Formulas (IV)-(V): 
 
       
         
           
           
               
               
           
         
       
       wherein R 1  is selected from a hydrocarbyl group of 1-50 carbon atoms and R 2  is selected from hydrogen, or a hydrocarbyl group of 1-50 carbon atoms, R 7  is an amino group and in the compounds of the Formula (IV) n is selected such that the compounds have a total number average molecular weight Mw of 10,000 to 70,000, or from about 20,000 to about 60,000, or from about 30,000 to 50,000; and
 iii) a compound of the Formula (VI) 
 
       
         
           
           
               
               
           
         
       
       wherein R 5  is a hydrocarbyl group having 1-20 carbon atoms, wherein the performance in the Ball Rust Test is determined relative to a same lubricating composition in the absence of the TBN booster.