Rheological and Tribological Properties of Lubricating Greases Based on Esters and Polyurea Thickeners
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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.
Keywords:lubricating greases esters diureas rheology tensile strength colloid stability dropping point wear scar diameter
The work was supported by the Ministry of Education and Science of Russia, agreement no. 14.607.21.0181 (unique project identifier RFMEFI60717X0181).
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