Urea grease

Abstract

A urea grease of the invention is prepared by applying shear to a mixture of a monoamine compound and a diisocyanate compound to cause a reaction in the mixture, in which the monoamine compound consists of an alicyclic monoamine, and the urea grease has Peak High32-64s of 10 or less and Level High32-64s of 40 or less according to an FAG method.

1 : A urea grease, prepared by a method comprising:
 applying shear to a mixture of a monoamine compound and a diisocyanate compound to cause a reaction in the mixture,   wherein   the monoamine compound consists of an alicyclic monoamine, and   the urea grease has Peak High32-64s of 10 or less and Level High32-64s of 40 or less according to an FAG method.   
     
     
         2 : The urea grease according to  claim 1 , wherein
 the alicyclic monoamine consists of cyclohexylamine.   
     
     
         3 : The urea grease according to  claim 1 , wherein
 the shear is applied at a shear rate of 10 2  s −1  or more.   
     
     
         4 : The urea grease according to  claim 1 , wherein
 the shear is applied at a shear rate of 10 3  s −1  or more.   
     
     
         5 : The urea grease according to  claim 1 , wherein
 the mixture is prepared by mixing a first base oil comprising the monoamine compound and a second base oil comprising the diisocyanate compound.   
     
     
         6 : The urea grease according to  claim 5 , wherein
 the shear is applied to the mixture within 15 minutes after mixing the first base oil and the second base oil.   
     
     
         7 : The urea grease according to  claim 1 , wherein
 the shear is applied at a shear rate of 10 7 s −1  or less.   
     
     
         8 : The urea grease according to  claim 1 , wherein
 ratio of a maximum shear rate to a minimum shear rate in the shear applied to the mixture is 70 or less.