The Synthesis of Phosphate Ester Functional Monomer by Solvent Dispersion

The functional monomer of acrylic hydroxypropyl phosphate was synthesized by using solvent dispersion P2O5 controlled-releasing method.The effects of solvent and its dosage,material feeding ratio,reacting duration,have hydrolysis reaction or not on the content of monoester and diester in phosphate were investigated.The results showed that the mole ratio of monoester and diester was uppermost when n-hexane was selected to be dispersion solvent and m(n-hexane):m(P2O5)=4:1,and material feeding ratio n(HPA):n(P2O5)=2.4:1,and reacting duration was 4 hours,and heat preservation time was 10 minutes at hydrolysis temperature after esterification reaction.The mole ratio of monoester and diester increased from 3.85 to 10.36 compared to the traditional direct feeding method.