Lubricant

Abstract

Provided is a lubricant including a deep eutectic solvent consisting of a hydrogen bond acceptor and a hydrogen bond donor, the lubricant having a halogen atom content of 0.1% by mass or less. The lubricant provided contains a carbon-neutral component, and shows a favorable lubricating property and low corrosiveness to metals.

1 . A lubricant, comprising:
 a deep eutectic solvent consisting of a hydrogen bond acceptor and a hydrogen bond donor,   wherein the lubricant has a halogen atom content of 0.1% by mass or less.   
     
     
         2 . The lubricant according to  claim 1 , wherein the hydrogen bond acceptor includes betaine. 
     
     
         3 . The lubricant according to  claim 2 , wherein the betaine has Formula (1) 
       
         
           
           
               
               
           
         
         wherein R 1  to R 3  are each independently a hydrocarbon group having 1 to 5 carbon atoms, and n is an integer of 1 to 3. 
       
     
     
         4 . The lubricant according to  claim 1 , wherein the hydrogen bond donor includes at least one or more selected from an alcohol, a carboxylic acid, and a nitrogen-containing compound. 
     
     
         5 . The lubricant according to  claim 1 , wherein the hydrogen bond donor includes glycerin or malic acid. 
     
     
         6 . The lubricant according to  claim 1 , further comprising:
 at least one or more selected from the group consisting of a mineral oil and a synthetic oil.   
     
     
         7 . The lubricant according to  claim 1 , wherein the deep eutectic solvent is at 50% by mass or more with respect to a total amount of the lubricant. 
     
     
         8 . The lubricant according to  claim 1 , wherein a content of the hydrogen bond acceptor with respect to a total amount of the lubricant is in a range of 25 to 75% by mass, and a content of the hydrogen bond donor with respect to the total amount of the lubricant is in a range of 25 to 75% by mass. 
     
     
         9 . The lubricant according to  claim 1 , further comprising:
 a lubricant additive.   
     
     
         10 . A method for lubrication, using comprising:
 applying the lubricant of  claim 1  for lubrication.   
     
     
         11 . A method for producing the lubricant of  claim 1 , comprising:
 mixing the hydrogen bond acceptor with the hydrogen bond donor such that the deep eutectic solvent is obtained.   
     
     
         12 . The method for producing the lubricant according to  claim 11 , further comprising:
 mixing a lubricant additive at least one of a time during the mixing of the hydrogen bond acceptor with the hydrogen bond donor and a time after the mixing of the hydrogen bond acceptor with the hydrogen bond donor.   
     
     
         13 . The lubricant according to  claim 2 , wherein the hydrogen bond donor includes at least one selected from an alcohol, a carboxylic acid, and a nitrogen-containing compound. 
     
     
         14 . The lubricant according to  claim 2 , wherein the hydrogen bond donor includes glycerin or malic acid. 
     
     
         15 . The lubricant according to  claim 2 , further comprising:
 at least one selected from the group consisting of a mineral oil and a synthetic oil.   
     
     
         16 . The lubricant according to  claim 2 , wherein the deep eutectic solvent is at 50% by mass or more with respect to a total amount of the lubricant. 
     
     
         17 . The lubricant according to  claim 2 , wherein a content of the hydrogen bond acceptor with respect to a total amount of the lubricant is in a range of 25 to 75% by mass, and a content of the hydrogen bond donor with respect to the total amount of the lubricant is in a range of 25 to 75% by mass. 
     
     
         18 . The lubricant according to  claim 2 , further comprising:
 a lubricant additive.   
     
     
         19 . The lubricant according to  claim 3 , wherein the hydrogen bond donor includes at least one selected from an alcohol, a carboxylic acid, and a nitrogen-containing compound. 
     
     
         20 . The lubricant according to  claim 3 , wherein the hydrogen bond donor includes glycerin or malic acid.