Lubricant composition and lubricant composition-covered metal sheet

Abstract

Provided is a lubricant composition and a lubricant composition-covered metal sheet excellent in degreasing property corrosion resistance, and moldability of a metal sheet. The lubricant composition of the invention comprises a paraffin wax, a liquid paraffin, and a sorbitan fatty acid ester, with a content of the liquid paraffin relative to 100 parts by mass of the paraffin wax being 10-500 parts by mass; an HLB value of the sorbitan fatty acid ester being more than 0 and 4.5 or less; and a content of the sorbitan fatty acid ester relative to 100 parts by mass of total of the paraffin wax and the liquid paraffin being 5-30 parts by mass. The sorbitan fatty acid ester preferably has a sorbitan having only a part of hydroxyl groups thereof esterified. The lubricant composition preferably further comprises a polyoxyethylene alkyl ether which preferably has an HLB value of 10-20.

1 . A lubricant composition comprising a paraffin wax, a liquid paraffin, and a sorbitan fatty acid ester, wherein
 a content of the liquid paraffin relative to 100 parts by mass of the paraffin wax is 10 parts by mass or more and 500 parts by mass or less,   an HLB value of the sorbitan fatty acid ester is more than 0 and 4.5 or less, and   a content of the sorbitan fatty acid ester relative to 100 parts by mass of a total of the paraffin wax and the liquid paraffin is 5 parts by mass or more and 30 parts by mass or less.   
     
     
         2 . The lubricant composition according to  claim 1 , wherein the sorbitan fatty acid ester is one comprising a sorbitan having only a part of hydroxyl groups thereof esterified. 
     
     
         3 . The lubricant composition according to  claim 1 , further comprising a polyoxyethylene alkyl ether, with an HLB value of the polyoxyethylene alkyl ether being 10 or more and 20 or less. 
     
     
         4 . The lubricant composition according to  claim 3 , wherein a total content of the sorbitan fatty acid ester and the polyoxyethylene alkyl ether relative to 100 parts by mass of a total of the paraffin wax and the liquid paraffin is 5 parts by mass or more and 40 parts by mass or less. 
     
     
         5 . The lubricant composition according to  claim 2 , further comprising a polyoxyethylene alkyl ether, with an HLB value of the polyoxyethylene alkyl ether being 10 or more and 20 or less. 
     
     
         6 . The lubricant composition according to  claim 5 , wherein a total content of the sorbitan fatty acid ester and the polyoxyethylene alkyl ether relative to 100 parts by mass of a total of the paraffin wax and the liquid paraffin is 5 parts by mass or more and 40 parts by mass or less. 
     
     
         7 . The lubricant composition according to  claim 1 , wherein a melting point determined in conformity with JIS-K2235 (2009) of the paraffin wax is 45° C. or higher and 65° C. or lower. 
     
     
         8 . The lubricant composition according to  claim 1 , wherein a molecular weight of the liquid paraffin is larger than a molecular weight of the paraffin wax, and a difference between the molecular weight of the liquid paraffin and the molecular weight of the paraffin wax is 50 or more and 200 or less. 
     
     
         9 . A lubricant composition-covered metal sheet, comprising a metal sheet and a lubricant layer laminated at least on one of the faces of the metal sheet, wherein the lubricant layer is formed with the lubricant composition according to  claim 1 .