Lubricating oil composition comprising an additive combination of a carboxylic acid and an amine as ant-rust agent

Abstract

A lubricating oil composition is provided containing a major amount of a lubricating oil base oil and a minor amount of an additive combination containing (i) a carboxylic acid-based or carboxylic acid ester based anti-rust agent; (ii) at least one type of amine selected from among the group comprising (A) the alkyl amines which can be represented by general formula (1) (R 1 ) n NH 3-n   (1) wherein R 1 represents a saturated or unsaturated alkyl group which has from 12 to 30 carbon atoms, and n is an integer of value 1 or 2; and (B) the N-alkylpolyalkylenediamines which can be represented by general formula (2) R 2 NH(CH 2 ) m NH 2   (2) wherein R 2 represents a saturated or unsaturated alkyl group which has from 12 to 30 carbon atoms, and m is an integer of value from 2 to 5.

1 . A lubricating oil composition comprising a minor amount of an additive combination comprising 
 (i) a carboxylic acid-based or carboxylic acid ester-based anti-rust agent;    (ii) at least one type of amine selected from the group consisting of (A) alkyl amines which can be represented by general formula (1),   (R 1 ) n NH 3-n   (1)   wherein R 1  represents a saturated or unsaturated alkyl group which has from 12 to 30 carbon atoms, and n is an integer of value 1 or 2; and (B) N-alkylpolyalkylenediamines which can be represented by general formula (2),   R 2 NH(CH 2 ) m NH 2   (2)   wherein R 2  represents a saturated or unsaturated alkyl group which has from 12 to 30 carbon atoms, and m is an integer of value from 2 to 5; and a major amount of a lubricating oil base oil, wherein said composition comprises from 0.001 to 0.5 part by weight of the carboxylic acid-based or carboxylic acid ester-based anti-rust agent; and from 0.001 to 0.05 part by weight of the at least one type of amine, per 100 parts by weight of lubricating oil base oil.    
     
     
         2 . The lubricating oil composition of  claim 1  wherein said composition comprises from 0.001 to 0.05 part by weight of the carboxylic acid-based or carboxylic acid ester-based anti-rust agent, per 100 parts by weight of lubricating oil base oil.  
     
     
         3 . The lubricating oil composition of  claim 1 , which further comprises, as an extreme pressure additive, at least one compounds selected from β-dithiophosphorylpropionic acids which can be represented by general formula (3), 
       S═P(—O—R 3 ) 2 SCH 2 CH(R 4 )COOH  (3) 
       wherein R 3  represents a branched alkyl group which has from 3 to 8 carbon atoms, and R 4  is a hydrogen atom or a group selected from among the linear chain or branched alkyl groups which have from 1 to 4 carbon atoms; triaryl phosphorothioates which can be represented by general formula (4) 
       S═P(O—Ph—R 5 ) 3   (4) 
       wherein Ph represents a phenyl group, and R 5  is a hydrogen atom or a linear chain or branched alkyl group which has from 1 to 9 carbon atoms; and acidic phosphate esters which can be represented by general formula (5), 
       O═P(OR 6 ) 3-r (OH) r   (5) 
       wherein R 6  is a linear chain or branched alkyl group which has from 3 to 13 carbon atoms, and r is an integer of value 1 or 2.  
     
     
         4 . The lubricating oil composition of  claim 1 , wherein the base oil is a petroleum based and/or synthetic hydrocarbon based oil.  
     
     
         5 . The lubricating oil composition of  claim 3 , wherein said composition comprises from 0.001 to 0.05 part by weight of the carboxylic acid-based or carboxylic acid ester-based anti-rust agent, per 100 parts by weight of lubricating oil base oil.  
     
     
         6 . A process for producing a lubricating oil composition comprising compounding a minor amount of (i) a carboxylic acid-based or carboxylic acid ester-based anti-rust agent; and (ii) at least one type of amine selected from the group consisting of (A) alkyl amines which can be represented by general formula (1), 
       (R 1 ) n NH 3-n   (1) 
       wherein R 1  represents a saturated or unsaturated alkyl group which has from 12 to 30 carbon atoms, and n is an integer of value 1 or 2; and (B) N-alkylpolyalkylenediamines which can be represented by general formula (2), 
       R 2 NH(CH 2 ) m NH 2   (2) 
       wherein R 2  represents a saturated or unsaturated alkyl group which has from 12 to 30 carbon atoms, and m is an integer of value from 2 to 5, as an anti-rust additive combination in a major amount of a lubricating oil base oil.  
     
     
         7 . The process of  claim 6  wherein the carboxylic acid-based or carboxylic acid ester-based anti-rust agent is present in an amount of from 0.001 to 0.5 part by weight; and the at least one type of amine is present in an amount of from 0.001 to 0.2 part by weight, per 100 parts by weight of lubricating oil base oil.  
     
     
         8 . The process of  claim 6  wherein the at least one type of amine is present in an amount of from 0.001 to 0.05 part by weight, per 100 parts by weight of lubricating oil base oil composition.  
     
     
         9 . The process of  claim 6  wherein the process further comprises, adding as an extreme pressure additive at least one compound selected from the group consisting of β-dithiophosphorylpropionic acids which can be represented by general formula (3), 
       S═P(—O—R 3 ) 2 SCH 2 CH(R 4 )COOH  (3) 
       wherein R 3  represents a branched alkyl group which has from 3 to 8 carbon atoms, and R 4  is a hydrogen atom or a group selected from among the linear chain or branched alkyl groups which have from 1 to 4 carbon atoms; triaryl phosphorothioates which can be represented by general formula (4) 
       S═P(O—Ph—R 5 ) 3   (4) 
       wherein Ph represents a phenyl group, and R 5  is a hydrogen atom or a linear chain or branched alkyl group which has from 1 to 9 carbon atoms; and acidic phosphate esters which can be represented by general formula (5), 
       O═P(OR 6 ) 3-r (OH) r   (5) 
       wherein R 6  is a linear chain or branched alkyl group which has from 3 to 13 carbon atoms, and r is an integer of value 1 or 2.  
     
     
         10 . A hydraulic oil composition comprising a lubricating oil composition of  claim 1 .  
     
     
         11 . A compressor oil composition comprising a lubricating oil composition of  claim 1 .  
     
     
         12 . A turbine oil composition comprising a lubricating oil composition of  claim 1 .  
     
     
         13 . A bearing oil composition comprising a lubricating oil composition of  claim 1 .  
     
     
         14 . A gear oil composition comprising a lubricating oil composition of  claim 1 .  
     
     
         15 . A compressor oil composition comprising a lubricating oil composition of  claim 3 .  
     
     
         16 . A turbine oil composition comprising a lubricating oil composition of  claim 3 .  
     
     
         17 . A bearing oil composition comprising a lubricating oil composition of  claim 3 .  
     
     
         18 . A gear oil composition comprising a lubricating oil composition of  claim 3 .  
     
     
         19 . A hydraulic oil composition comprising a lubricating oil composition of  claim 3 .  
     
     
         20 . A lubricating oil composition of  claim 3  wherein the extreme pressure additive is a β-dithiophosphorylpropionic acid which can be represented by general formula (3), 
       S═P(—O—R 3 ) 2 SCH 2 CH(R 4 )COOH  (3) 
       wherein R 3  represents a branched alkyl group which has from 3 to 8 carbon atoms, and R 4  is a hydrogen atom or a group selected from among the linear chain or branched alkyl groups which have from 1 to 4 carbon atoms.  
     
     
         21 . A lubricating oil composition of  claim 3  wherein the extreme pressure additive is a triaryl phosphorothioate which can be represented by general formula (4) 
       S═P(O—Ph—R 5 ) 3   (4) 
       wherein Ph represents a phenyl group, and R 5  is a hydrogen atom or a linear chain or branched alkyl group which has from 1 to 9 carbon atoms.  
     
     
         22 . A lubricating oil composition of  claim 3  wherein the extreme pressure additive is an acidic phosphate ester which can be represented by general formula (5), 
       O═P(OR 6 ) 3-r (OH) r   (5) 
       wherein R 6  is a linear chain or branched alkyl group which has from 3 to 13 carbon atoms, and r is an integer of value 1 or 2.  
     
     
         23 . A lubricating oil composition of  claim 1  wherein the lubricating oil base oil has a kinematic viscosity of from 2 to 680 mm 2 /s (40° C.), a total sulfur content of from 0 to 1 wt. %, a total nitrogen content of from 0 to 100 ppm, and an aniline point of from 80 to 130° C.