Rheological and tribological properties of enzymatic modified epoxidized soybean oil
In order to expand the application range of soybean oil(SO),lipase Novozym435 was used to catalyze the epoxidation modification of SO to synthesize epoxidized soybean oil(ESO),and the ESO was characterized by infrared spectroscopy and nuclear magnetic resonance hydrogen spectroscopy,and its rheological and tribological properties were investigated.The results showed that the ESO was successfully synthesized;compared with SO,the viscosity index of ESO increased,and the viscosity-temperature performance was better;compared with mineral lubricant and SO,the reduction rates of average friction coefficient and wear volume of the ESO were 21.6％,17.0％,and 71.2％,64.9％,respectively,and the friction and wear reduction performance was significantly improved.ESO can form a dense,thick physicochemical adsorption film on the friction surface,thus effectively reducing friction and anti-wear and improving lubricity.
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