Lubricant Composition

Abstract

The present invention provide a lubricant composition comprising a lubricant base oil, wherein said lubricant composition contains 0.08% by mass or less of zinc dithiophosphate or no zinc dithiophosphate as phosphorus amount for total amount of said lubricant composition, contacts metallic materials containing lead, and contains at least a kind of additive selected from a group consisting of following (A)˜(D): (A) organomolybdenum compounds (except molybdenum dithiophosphate); (B) borate ester and/or derivatives thereof; (C) organomolybdenum compounds, and borate ester and/or derivatives thereof; and (D) organomolybdenum compounds, and borated alkyl or alkenyl succinimide.

1 . A lubricant composition comprising a lubricant base oil, 
 wherein said lubricant composition contains 0.08% by mass or less of zinc dithiophosphate or no zinc dithiophosphate as phosphorus amount for total amount of said lubricant composition, contacts metallic materials containing lead, and contains at least a kind of additive selected from a group consisting of following (A)˜(D):    (A) organomolybdenum compounds (except molybdenum dithiophosphate);    (B) borate ester and/or derivatives thereof;    (C) organomolybdenum compounds, and borate ester and/or derivatives thereof; and    (D) organomolybdenum compounds, and borated alkyl or alkenyl succinimide.    
   
   
       2 . A lubricant composition according to  claim 1 , wherein said organomolybdenum compounds are compounds obtained by reaction of any one kind of compound selected from a group consisting of: sulfur-free organic acid, amine, amide, imide, and compounds having alcoholic hydroxyl group, with tetra- to hexa-valent molybdenum compounds.  
   
   
       3 . A lubricant composition according to  claim 1 , wherein said organomolybdenum compounds are at least any one kind of compound selected from a group consisting of following (a)˜(e): 
 (a) a salt of at least a kind of acid containing phosphorus selected from a group consisting of: phosphite monoester, phosphate monoester, phosphite diester, phosphate diester, phosphonous acid, phosphonic acid, phosphonous acid monoester, and phosphonic acid monoester, respectively having at least an alkyl group of carbon number 3 to 30, with molybdenum compounds;    (b) a complex of a kind of amine compound selected from a group consisting of: primary amine, secondary amine, and alkanolamine, respectively having at least an alkyl group or an alkenyl group of carbon number 3 to 30, with molybdenum compounds;    (c) a salt or an ester of alcohols having at least an alcoholic hydroxyl group selected from a group consisting of: monovalent alcoholes, polyvalent alcohols, and partial ester or partial ether of the polyvalent alcohols of carbon number 3 to 30, with molybdenum compounds;    (d) a salt or an ester of amide compounds having at least an alkyl group or an alkenyl group of carbon number 3 to 30 and alcoholic hydroxyl groups, with molybdenum compounds; and    (e) a salt of fatty acids of carbon number 3 to 30 with molybdenum compounds.    
   
   
       4 . A lubricant composition according to  claim 1 , further comprising one or more kind of additives selected from a group consisting of: antioxidant, anti-wear agent other than zinc dithiophosphate, and metallic detergent.  
   
   
       5 . A lubricant composition according to  claim 1 , wherein said lubricant composition is used for internal combustion engine of which slide members contain a metallic materials containing lead.  
   
   
       6 . A lubricant composition according to  claim 1 , wherein said lubricant composition contacts metallic materials containing lead, metallic materials containing copper-lead, or both of the metallic materials containing lead and the metallic materials containing copper, and 
 wherein said organomolybdenum compounds are compounds obtained by reaction of any one kind of compound selected from a group consisting of: sulfur-free organic acid except carboxylic acid, amine, amide, imide, and compounds having alcoholic hydroxyl groups, with tetra- to hexa-valent molybdenum compounds.    
   
   
       7 . A method for inhibiting corrosion or corrosive wear of a metallic materials containing lead having a contact with a lubricant composition comprising a lubricant base oil, 
 wherein said lubricant composition contains 0.08% by mass or less of zinc dithiophosphate or no zinc dithiophosphate as phosphorus amount for total amount of said lubricant composition, and    said lubricant composition contains at least a kind of additive selected from a group consisting of following (A)˜(D):    (A) organomolybdenum compounds (except molybdenum dithiophosphate);    (B) borate ester and/or derivatives thereof;    (C) organomolybdenum compounds, and borate ester and/or derivatives thereof; and    (D) organomolybdenum compounds, and borated alkyl or alkenyl succinimide.    
   
   
       8 . A method for inhibiting corrosion or corrosive wear according to  claim 7 , 
 wherein said method inhibits corrosion or corrosive wear of metallic materials containing lead, metallic materials containing copper-lead, or both of the metallic materials containing lead and the metallic materials containing copper, and    wherein organomolybdenum compounds among said additives are compounds obtained by reaction of any one kind of compound selected from a group consisting of: sulfur-free organic acid except carboxylic acid, amine, amide, imide, and compounds having alcoholic hydroxyl groups, with tetra- to hexa-valent molybdenum compounds.    
   
   
       9 . An anticorrosion or anticorrosive-wear agent for copper and lead, 
 wherein said agent is an additive added to a lubricant composition comprising a lubricant base oil, contains 0.08% by mass or less of zinc dithiophosphate or no zinc dithiophosphate as phosphorus amount for total amount of said lubricant composition, contacts metallic materials containing lead, metallic materials containing copper-lead, or both of the metallic materials containing lead and the metallic materials containing copper, and further contains organomolybdenum compounds obtained by reaction of any one kind of compound selected from a group consisting of: sulfur-free organic acid except carboxylic acid, amine, amide, imide, and compounds having alcoholic hydroxyl group, with tetra- to hexa-valent molybdenum compounds.    
   
   
       10 . A use of a lubricant composition for lubricating metallic materials containing lead in a machine having metallic materials containing lead therein, wherein said lubricant composition comprises a lubricant base oil, contains 0.08% by mass or less of zinc dithiophosphate or no zinc dithiophosphate as phosphorus amount for total amount of said lubricant composition, and contains at least a kind of additive selected from a group consisting of following (A)˜(D) 
 (A) organomolybdenum compounds (except molybdenum dithiophosphate);    (B) borate ester and/or derivatives thereof;    (C) organomolybdenum compounds, and borate ester and/or derivatives thereof; and    (D) organomolybdenum compounds, and borated alkyl or alkenyl succinimide.