Abstract
Thickener formulation plays a significant role in the performance characteristics of grease. The polyurea greases (PUGs) were synthesized using mineral oil (500SN) as the base oil, and by regulating the reaction of diphenylmethane diisocyanate (MDI) and different organic amines. The as-prepared PUGs from the reaction of MDI and cyclohexylamine/p-toluidine exhibit the optimum physicochemical and friction-wear properties, confirming that the regulation of thickener formulation can improve the performance characteristics of grease, including friction reduction, wear, corrosion resistance, and load-carrying capacity. The anti-corrosion and lubrication properties of as-prepared PUGs depend on good sealing functions and a boundary lubrication film (synergy of grease-film and tribo-chemical reaction film), as well as their chemical components and structure.
Highlights
With the advancement of industrial technology, mechanical equipment inevitably operates in extremely severe climate/working conditions, such as high/low temperature, sandstorms, salt spray, acid/ alkali atmospheres, high/low speeds, and loads
The polyurea greases (PUGs) formulated by cyclohexylamine and p-toluidine (C+P) (2:1) possesses the best physicochemical properties
Twelve PUGs were successfully synthesized via regulating organic amines
Summary
With the advancement of industrial technology, mechanical equipment inevitably operates in extremely severe climate/working conditions, such as high/low temperature, sandstorms, salt spray, acid/ alkali atmospheres, high/low speeds, and loads. Its inherent consistency and adhesiveness differ from liquid and solid lubricants, and can be applied on friction pairs without leakage due to gravity [5]. It possesses unique superiority as a corrosion-resistant material. PUG has advantages such as oxidation stability, high/lowtemperature application, mechanical stability, antirust properties, and colloidal stability [6,7,8]. As a kind of a non-soap based grease, PUGs are free from the catalytic oxidation of soap base grease, thereby prolonging their service life at high temperatures [9].
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