Preparation and properties of low temperature fluidity polyether polyol ester antiwear agent

Abstract

Polyether polyol ester was obtained by esterification reaction with tall oil fatty acid and propoxylated pentaerythritol, and then the viscosity was adjusted by adding a depressant, thus the diesel antiwear agent with better low temperature fluidity was obtained. The structure of the product was characterized by FTIR. The results showed that the esterification rate reached 98.9% when the reaction temperature was 190°C, the reaction time was 3.5h and the amount of catalyst was 4% of the total mass of acid alcohol. After the reaction of propoxylated pentaerythritol with tall oil fatty acid, the fluidity of the product at low temperature was significantly improved, and the product had better anti-emulsification and lubricating properties. When the addition amount was 150ug/g, the spot diameter decreased to 408μm. According to the kinetic analysis, the antiwear molecules are adsorbed to the metal surface through diffusion. On the surface of each iron atom, there are about 1.975×1010 antiwear molecules, forming a protective film with a dynamic equilibrium of adsorption-desorption, thus ensuring the lubricity of diesel oil.