engleski

Functional poly(alkyl methacrylate) additives for improvement of wear reduction properties of lubricating oils

The new chemistries of poly(alkyl methacrylate) based additives containing different nitrogen or oxygen functional groups were developed for reduction of wear and friction of lubricanting oils. The additives were synthesized by radical copolymerization in solution of mineral, synthetic and vegetable oils. Wear reduction capacity of the additives was determined according to the standard test method EN ISO 12156-1 for 0.5 wt. % solutions of polymers in lubricating mineral base oil. The coefficient of friction was measured using the 4-ball geometry of the TA Discovery HR30 rheometer at different sliding speeds to simulate different applications and at different temperatures from -20 °C to 150 °C. The base oil solution of polymethacrylate additive with the hydoxyl functional group showed the smallest diameter of the wear scar and the lowest coefficient of friction.

wear reduction ; poly(alkyl methacrylate) ; lubricanting oils

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