Functional fluids and concentrates thickened with associative polyether thickeners containing certain primary amines

摘要

This invention relates to water based functional fluids and antiwear compositions for such functional fluids. The functional fluids can be used in hydraulic systems or as metal working compositions to cool and lubricate surfaces which are in frictional contact during operations such as the turning, cutting, peeling, or grinding of metals. More specifically, the invention relates to a novel antiwear composition for inclusion in functional fluids which comprises: (a) a metal dialkyldithiophosphate, and (b) certain primary amines. It has been found that this combination of certain primary amines with the metal dialkyldithiophosphate provides improved wear properties over the use of the metal dialkyldithiophosphate alone, particularly at higher operating pressures such as 2000 psig and above. The functional fluid would also contain (c) a thickener and optionally (d) a carboxylic compound; and (e) a surfactant.