Rheological and Tribological Properties of Lubricating Greases Based on Esters and Polyurea Thickeners

Resumo

Lubricating greases based on pentaerythritol and trimethylolpropane esters and dioctyl sebacate have been synthesized using diureas as a thickener prepared by reactions of toluene diisocyanate, aniline, and primary aliphatic amines of various structures. The physicochemical properties of the greases, such as ultimate strength, yield stress, modulus of elasticity, dropping point, and colloid stability, have been characterized, and data on their antiwear activity have been obtained. The relationship between the structure of grease components, its rheology, and antiwear properties has been revealed.