Abstract:

The method of ASTM D2619-09(Beverage Bottle Method) was used to analyze the ability of anti-hydrolysis of hydraulic base oil pentaerythritolester(PE) containing carbodiimide at different addition and hydrolysis time. Other properties of PE containing carbodiimide were examined. The results show that the hydrolysis of PE tends to decrease with the increase of carbodiimide, and the proper accretion of carbodiimide is 0.5%(mass fraction) . Carbodiimide has better ability of anti-hydrolysis than other amine antioxidants with the increase of hydrolysis time. The carbodiimide will not worsen other properties of PE, and the tribologicalcharacteristics of PE increase with carbodiimide has been improved.

Key words: carbodiimide, anti-hydrolysis, synthetic ester oil, hydraulic oil