To enhance the flame retardancy of waterborne acrylic resin,the nano-SiO2 modified by the silane coupling agent(KH550)was used as the filler and evenly dispersed in the aqueous dispersion of methyl 2-hydroxyethyl acrylate phosphate(PM2)modified chloroether acrylate.Then,the waterborne phosphosilicate/chloroether acrylate coating was formulated with the addition of an amino resin curing agent.The mechanical properties,corrosion resistance,and flame retardancy of the coating were tested and compared with those of a pure acrylate coating and a PM2-modified chloroether acrylate coating.The results indicate that the coating mechanical properties are optimal when the mass fraction of modified nano-SiO2 is 4%in the resin solid mass.The introduction of modified nano-SiO2 significantly enhances the corrosion resistance of the composite coating.The phosphosilicate/chloroether acrylate coating achieves an oxygen index of 25.3%and a flame retardancy rating of HB.The surface of the PM2-modified chloroether acrylate coating after combustion is porous,whereas the surface of the phosphosilicate/chloroether acrylate coating after combustion is dense.Their flame retardancy mechanisms are different.The results of the residual carbon rate after combustion indicate that the phosphosilicate component in the phosphosilicate/chloroether acrylate coating plays a synergistic flame retardant effect.
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