Preparation of Water-Tolerant UV-Curable SixOy(OH)z/PA Aqueous Dispersion Films

In this experiment, silicon oxide groups (SixOy(OH)(z)) and carbon carbon double bonds (C=C) were introduced onto the PA molecular chains. In the first step, acrylic resins (PA), grafted by organosilicon groups, were prepared by solution polymerization. In the second step, UV curable SixOy(OH)(z)/PA aqueous dispersions, with a high silicon content, were prepared by hydrolyzation and condensation of PA and silane coupling agents (KH-570). Aqueous dispersions possess certain stability when the KH-570 consumption ranges from 0 wt % to 30.0 wt %. With increased content of C=C, the water absorption of UV cured SixOy(OH)(z)/PA aqueous dispersion films soaked in the water for 24 h was decreased from 78% to 0%. Furthermore, heat curing further improved the water tolerance of the UV cured aqueous dispersion films. The water absorption change of the films caused by heat curing could reach up to 17%.