The research group headed by Prof. Wumanjiang Eli at Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (XTIPC) has developed an efficient and flexible route for the synthesis of ester-phenolic antioxidant. In the present study, phenolic antioxidative group was introduced into dipentaerythritol isostearate, and a liquid ester-phenolic antioxidant was obtained.

Firstly, higher molecular weight reduces the volatility, which allowed these products to be applicable under high temperature conditions. The volatility and thermal stability were tested by Thermogravimetric (TG)/Differential Scanning Calorimetry (DSC). On the other hand, increasing alkyl chains can improve the solubility in lubricating oils. The antioxidation properties of this liquid ester-phenolic antioxidant were investigated by Rotary Bomb Oxidation Test. Another advantage of this liquid antioxidant is that it can act as antioxidant-modified synthetic ester, a lubricating base oil of excellent lubricant properties.

The results have been published online in Lubrication Science.This work was supported by the National Key Technology R & D Program.