Lubricating composition

Abstract

The present invention aims to offer a lubricating composition with excellent heat resistance, mechanical stability, water resistance, corrosion resistance, load resistance and flame resistance. To this end the present invention suggests that from 2 to 68% by weight of tricalcium phosphate relative to the total composition is added to a base oil, which may be a mineral oil and/or a synthetic oil. Surfactants are further added, and the whole is thoroughly mixed and kneaded to give a semi-solid lubricating composition. For the surfactants, non-ionic surfactants are most suitable, and fatty acid esters such as glycerine fatty acid esters, sorbitan fatty acid esters and sucrose fatty acid esters may be used. The amount used is from 0.2 to 18% by weight relative to the total composition.

1 . A lubricating composition comprising:
 (a) a base oil;   (b) a tricalcium phosphate and a urea compound in amounts such that a sum thereof is from 3 to 70% by weight relative to the total composition; and   (c) a fatty acid type surfactant in an amount of from 0.2 to 18% by weight relative to the total composition, wherein the fatty acid type surfactant is selected from the group consisting of a glycerine fatty acid ester, a sorbitan fatty acid ester, and combinations thereof.   
   
   
       2 . The lubricating composition of  claim 1 , wherein the tricalcium phosphate is present in an amount of from 2 to 68% by weight relative to the total composition. 
   
   
       3 . The lubricating composition of  claim 1 , wherein the fatty acid ester type surfactant has from 12 to 22 carbon atoms. 
   
   
       4 . The lubricating composition of  claim 2 , wherein the urea compound is present in an amount of not more than 8% by weight relative to the total composition. 
   
   
       5 . (canceled) 
   
   
       6 . The lubricating composition of  claim 4 , wherein the amount of the tricalcium phosphate is greater than the amount of the urea compound. 
   
   
       7 . The lubricating composition of  claim 6 , wherein the tricalcium phosphate is present in an amount of from 41 to 60% by weight relative to the total composition and the fatty acid type surfactant is present in an amount of from 1 to 15% by weight relative to the total composition. 
   
   
       8 . The lubricating composition of  claim 6 , wherein the tricalcium phosphate is present in an amount of from 4.5 to 55% by weight relative to the total composition and the fatty acid type surfactant is present in an amount of from 2 to 10% by weight relative to the total composition. 
   
   
       9 . The lubricating composition of  claim 6 , wherein the glycerine fatty acid ester is selected from the group consisting of monoglyceride stearate, monoglycerides monooleate, mono-diglycerides of stearic acid, and mono-diglycerides of oleic acid, and wherein the sorbitan fatty acid ester is selected from the group consisting of sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan tristearate, and sorbitan trioleate. 
   
   
       10 . A method of preparing a lubricating composition, the method comprising mixing the following:
 (a) a base oil;   (b) a tricalcium phosphate and a urea compound in amounts such that a sum thereof is from 3 to 70% by weight relative to the total composition; and   (c) a fatty acid type surfactant in an amount of from 0.2 to 18% by weight relative to the total composition, wherein the fatty acid type surfactant is selected from the group consisting of a glycerine fatty acid ester, a sorbitan fatty acid ester, and combinations thereof.   
   
   
       11 . The method of  claim 10 , wherein the tricalcium phosphate is present in an amount of from 2 to 68% by weight relative to the total composition. 
   
   
       12 . The method of  claim 10 , wherein the fatty acid ester type surfactant has from 12 to 22 carbon atoms. 
   
   
       13 . The method of  claim 11 , wherein the urea compound is present in an amount of not more than 8% by weight relative to the total composition. 
   
   
       14 . The method of  claim 13 , wherein the amount of the tricalcium phosphate is greater than the amount of the urea compound. 
   
   
       15 . The method of  claim 14 , wherein the tricalcium phosphate is present in an amount of from 41 to 60% by weight relative to the total composition and the fatty acid type surfactant is present in an amount of from 1 to 15% by weight relative to the total composition. 
   
   
       16 . The method of  claim 14 , wherein the tricalcium phosphate is present in an amount of from 45 to 55% by weight relative to the total composition and the fatty acid type surfactant is present in an amount of from 2 to 10% by weight relative to the total composition. 
   
   
       17 . The method of  claim 14  wherein the glycerine fatty acid ester is selected from the group consisting of monoglyceride stearate, monoglyceride monooleate, mono-diglycerides of stearic acid, and mono-diglycerides of oleic acid, and wherein the sorbitan fatty acid ester is selected from the group consisting of sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan tristearate, and sorbitan trioleate. 
   
   
       18 . The method of  claim 10 , wherein the mixing comprises mixing two lubricating compositions, wherein the first lubricating composition comprises a portion of the base oil and the tricalcium phosphate, and the fatty acid type surfactant, and the second lubricating composition comprises a portion of the base oil and the urea compound.