Use of a lubricating grease composition having a high upper use temperature

Abstract

A lubricant grease composition is disclosed, the lubricant grease composition including a base oil and a thickener. The thickener includes an aluminum-based complex soap and a polyurea thickener, wherein the lubricant grease is configured for lubrication of surfaces of components in which an upper use temperature of the lubricant grease composition is at least 90° C.

1 . A lubricant grease composition comprising:
 a base oil; and   a thickener comprising an aluminum-based complex soap and a polyurea thickener, wherein the lubricant grease is configured for lubrication of surfaces of components in which an upper use temperature of the lubricant grease composition is at least 90° C..   
     
     
         2 . A lubricant grease composition comprising:
 a base oil; and   a thickener comprising an aluminum-based complex soap and a polyurea thickener, wherein the lubricant grease is configured for lubrication of surfaces of components at a temperature that is at least intermittently at least 90° C..   
     
     
         3 . The lubricant grease claimed in  claim 1 , wherein the lubricant grease composition has a use temperature range of −60° C.. 
     
     
         4 . The lubricant grease claimed in  claim 1 , wherein a proportion of the polyurea thickener in the lubricant grease composition is 1% by weight to 11% by weight, based on the total weight of the lubricant grease composition. 
     
     
         5 . The lubricant grease claimed in  claim 1 , wherein the polyurea thickener is a reaction product of a diisocyanate selected from the group consisting of 2,4- diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4′—diisocyanatodiphenylmethane, 2,4′-diisocyanatophenyl-methane, 4,4′-diisocyanatodiphenyl, 4,4′-diisocyanato-3,3′-dimethylphenyl, 4,4′-diisocyanato-3,3′-dimethyl-phenylmethane, which may be used individually or in combination, with an amine of the general formula R′2-N—R, or a diamine of the general formula R′2-N—R—NR′2 where R is an aryl, alkyl or alkylene radical having 2 to 22 carbon atoms and R′ is identical or different and is a hydrogen or an alkyl, alkylene or aryl radical, or with mixtures of amines and diamines. 
     
     
         6 . The lubricant grease claimed in  claim 2 , wherein the lubricant grease is configured for lubrication of surfaces of components when the temperature is maintained for a period of at least 10 minutes. 
     
     
         7 . The lubricant grease claimed in  claim 1 , wherein the lubricant grease is configured for lubrication of surfaces of plastic-containing friction partners or of a combination of metallic and plastic-containing friction partners in actuators in the automotive sector. 
     
     
         8 . The lubricant grease claimed in  claim 1 , wherein the lubricant grease composition has an oil separation according to ASTM D 6184-17 (24 h/100° C.) of less than 12% by weight and/or according to ASTM D 6184-17 (24 h/100° C., then 24 h/110° C.) of less than 16% by weight and/or according to ASTM D 6184-17 (24 h/100° C., then 24 h/110° C., then 24 h/120° C.) of less than 20% by weight. 
     
     
         9 . The lubricant grease claimed in  claim 1 , wherein the aluminum-based complex soap has the formula (A) 
       
         
           
           
               
               
           
         
       
       where R is an aliphatic hydrocarbyl radical having 4 to 28 carbon atoms. 
     
     
         10 . The lubricant grease claimed in  claim 9 , wherein R is derived from one or more fatty acids selected from the group consisting of lauric acid, palmitic acid, myristic acid, and stearic acid. 
     
     
         11 . The lubricant grease claimed in  claim 1 , wherein the proportion of the aluminum-based complex soap in the lubricant grease composition is from 1% by weight to 11% by weight based on the total weight of the lubricant grease composition. 
     
     
         12 . The lubricant grease claimed in  claim 1 , wherein the proportion of aluminum-based complex soap and polyurea thickener together is from 2% by weight to 22% by weight, based on the total weight of lubricant grease composition. 
     
     
         13 . The lubricant grease claimed in  claim 1 , wherein the base oils are polyalphaolefins; or metallocene polyalphaolefins, and naphthenic mineral oils according to the API Group I classification. 
     
     
         14 . The lubricant grease claimed in  claim 1 , wherein the lubricant grease composition has the following composition:
 55% to 96% by weight of base oil,   1% to 11% by weight of polyurea thickener,   1% to 11% by weight of aluminum-based complex soap,   1% to 30% by weight of additives, and   1% to 30% by weight of solid lubricants.