Impregnating oil composition for sintered bearing, bearing apparatus and sliding member

Abstract

The novel impregnating oil composition for a sintered bearing is disclosed. The composition comprises a base oil, at least one compound represented by a formula (1). In the formula, D represents an m-valent cyclic group capable of binding to “m” of —X—R; each X represents a single bond or a bivalent linking group selected from the group consisting of NR 1 , where R 1 is a hydrogen atom or a C 1-30 alkyl group, oxygen, sulfur, carbonyl, sulfonyl and any combinations thereof; each R represents a substituted or non-substituted, alkyl group, alkenyl group, alkynyl group, aryl group or heterocyclic group, or a halogen atom, hydroxy, amino, mercapto, cyano, sulfide, carboxy or salt thereof, a sulfo or salt thereof, hydroxylamine, ureido or urethane; and m is an integer from 2 to 11.

1 . An impregnating oil composition for a sintered bearing, comprising:
 a base oil,   at least one compound represented by a formula (1) shown below:   Formula (1)   
     
       
         
         
             
             
         
       
       where D represents an m-valent cyclic group capable of binding to “m” of —X—R; each X represents a single bond or a bivalent linking group selected from the group consisting of NR 1 , where R 1  is a hydrogen atom or a C 1-30  alkyl group, oxygen, sulfur, carbonyl, sulfonyl and any combinations thereof; each R represents a substituted or non-substituted, alkyl group, alkenyl group, alkynyl group, aryl group or heterocyclic group, or a halogen atom, hydroxy, amino, mercapto, cyano, sulfide, carboxy or salt thereof, sulfo or salt thereof, hydroxylamine, ureido or urethane; and m is an integer from 2 to 11. 
     
   
   
       2 . The impregnating oil composition of  claim 1 , wherein the base oil contains synthetic hydrocarbon. 
   
   
       3 . The impregnating oil composition of  claim 1  or, wherein the base oil contains at least one type of poly-alpha-olefin, poly-alpha-olefin hydrate, ethylene-alpha-olefin copolymer, ethylene-alpha-olefin copolymer hydrate, a mixture of poly-alpha-olefin or hydrate thereof and alkyl naphthalene, a mixture of ethylene-alpha-olefin copolymer or hydrate thereof and alkyl naphthalene. 
   
   
       4 . The impregnating oil composition of  claim 1 , comprising the compound represented by the formula (1) in an amount from 0.1 to 10 weight % with respect to the total weight of the composition. 
   
   
       5 . The impregnating oil composition of  claim 1 , wherein the base oil comprises alkyl naphthalene in an amount from of 50 to 99.9 weight % and poly-alpha-olefin hydrate or ethylene-alpha-olefin copolymer hydrate in an amount from 50 to 0.1 weight % with respect to the total weight of the base oil. 
   
   
       6 . The impregnating oil composition of  claim 1 , wherein D, in the formula (1), represents a cyclic group of any one of formulae [1] to [9], [11] to [36] and [36a] to [74]: 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       where n is an integer of 2 or greater than 2, “*” represents a position capable of binding to a side chain, and when two or more positions are marked by “*”, it is not necessary that all positions marked by “*” are binding to side chains; M is a metal ion or two hydrogen atoms. 
     
   
   
       7 . The impregnating oil composition of  claim 1 , wherein D, in the formula (1), represents a five-, six- or seven-membered heterocyclic residue. 
   
   
       8 . The impregnating oil composition of  claim 1 , wherein the compound represented by the formula (1) is a compound represented by a formula (2) shown below: 
     
       
         
         
             
             
         
       
       where X 1 , X 2  and X 3  respectively represent a single bond or a bivalent linking group selected from the group consisting of NR 1 , where R 1  is a hydrogen atom or a C 1-30  alkyl group, oxygen, sulfur, carbonyl, sulfonyl and any combinations thereof; R 11 , R 12  and R 13  respectively represent a substituted or non-substituted, alkyl group, alkenyl group, alkynyl group, aryl group or heterocyclic group, or a halogen atom, hydroxy, amino, mercapto, cyano, sulfide, carboxy or salt thereof, sulfo or salt thereof, hydroxylamine, ureido or urethane. 
     
   
   
       9 . The impregnating oil composition of  claim 1 , wherein the compound represented by the formula (1) is a compound represented by a formula (3) shown below: 
     
       
         
         
             
             
         
       
       where X 21 , X 22  and X 23  respectively represent a single bond or a bivalent linking group selected from the group consisting of NR 1 , where R 1  is a hydrogen atom or a C 1-30  alkyl group, oxygen, sulfur, carbonyl, sulfonyl and any combinations thereof; R 21 , R 22  and R 23  respectively represent a substituent; and a21, a22 and a23 respectively represent an integer from 1 to 5. 
     
   
   
       10 . A bearing apparatus for bearing a rotating element rotatably comprising a sliding part wherein at least a part of the sliding part is a sintered body impregnated with a composition as set forth in  claim 1 . 
   
   
       11 . A sliding member comprising a sintered body impregnated with a composition as set forth  claim 1 . 
   
   
       12 . The sliding member of  claim 11 , wherein the sintered body is porous and the composition is within the pores of the sintered body.