酶法改性环氧大豆油的流变学与摩擦学性能研究

Rheological and tribological properties of enzymatic modified epoxidized soybean oil

为扩大大豆油的应用范围,采用脂肪酶Novozym435催化大豆油环氧化改性合成环氧大豆油,对环氧大豆油进行了红外光谱和核磁共振氢谱表征,并考察其流变学和摩擦学性能。结果表明:成功合成了环氧大豆油;相较于大豆油,环氧大豆油的黏度指数增大,黏温性能更优异;相较于矿物润滑油和大豆油,环氧大豆油的平均摩擦系数及磨损体积减少率分别为21.6%、17.0%和71.2%、64.9%,减摩抗磨性能显著提升。环氧大豆油可在摩擦表面形成致密、厚实的物理化学吸附膜,从而有效减摩抗磨,提高润滑性。

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.