Abstract:

An intermediate was prepared by the esterification of neopentyl glycol with paraphthaloyl chloride. The polymerization degree of the intermediate was between 3.5 and 1.45 as n(NPG)/n(TPA) was increased from 2.4 to 3.0. The yield of the intermediate was 75.5%. The complex ester was produced by esterification of the intermediate with oleic acid with a yield of 88.5%. The result shows that the viscosity was improved with the increase of the molecular mass of the product, the viscosity at 100 ℃ was between 17.8~27.6 mm2/s, the viscosity index was more than 125, solidifying point was below -27 ℃, the oxidative stability was also improved with the increase of the molecular mass of the product. The biodegradabilities of complex esters were more than 70%. The value of PB was 784 N, the value of wear diameter was 0.41 mm, the temperature of thermal decomposition was above 250 ℃. The complex esters can be used as excellent green lubricants.

Key words: neopentyl glycol, paraphthaloyl chloride, oleic acid, complex ester, lubricity