Abstract: Methacrylate is used as a raw material, a specific viscosity index improver polymethacrylate ( PMA) for phosphate ester was synthesized at a reaction temperature of 95 °C, an initiator dosage of 0.25 , a chain transfer agent dosage of 0.2 , and a reaction time of 4 h; The structure of the synthesized products was characterized by IR and NMR spectra. The application properties of the synthetic product were investigated by dissolving it in phosphate ester base oil. The results showed that the polymethacrylate product has a good solubility in phosphate ester, outstanding ability to improve the viscosity-temperature performance of the oil and excellent shear stability. It is an excellent specific viscosity index improver for phosphate esters.

Key words: phosphate ester, viscosity index improver, synthesis