Synthesis and study on functional hydroxyl phosphate monomer

A functional monomer of crosslinkable and polymerizable hydroxyl phosphate (HPAM) was prepared from glycidyl methacrylate (GMA) and concentrated phosphoric acid. The reaction process was tracked by acid value test and the optimal time for ring-opening esterification of epoxy group in GMA was determined. The synthesis mechanism of hydroxyl phosphate was analyzed and the optimal synthesis process was obtained. Five types of hydroxyl phosphate modified acrylate emulsions were prepared by polymerization of different HPAMs with acrylates. The performances of the emulsions and their films were studied. The optimal synthesis process of HPAM functional monomer is as follows: (1) adding dropwise GMA and concentrated H3PO4 with a molar ratio of 2:1 to a reactor at (0 ± 5) ℃ for ring-opening esterification reaction; (2) increasing temperature to (65 ± 2) ℃; and (3) maintaining the temperature for 3.5-4.0 h. The HPAM modified acrylate emulsion obtained by the optimal polymerization process has good stability, and its coating features adhesion strength 1 grade, hardness H, and impact strength 50 kg·cm.