SlLANE-MODIFIED ACRYLIC EMULSIONS FOR HIGH PERFORMANCE ARCHITECTURAL PAINT

摘要

In this work, it has been demonstrated that silyl-acrylates can be used as comonomers for synthesizing silane-modified acrylic emulsions. These silane-modified acrylic emulsions exhibit improved adhesion, and better water and stain resistance compared to the non-silane modified acrylic emulsion. The silane-modified acrylic emulsions were incorporated into two architectural paint formulations - one matte and one semi-glossy. The formulated semi-glossy paints exhibited excellent adhesion onto concrete under extreme wet conditions, with no blistering or delamination even after prolonged immersion in water. The matte paints exhibit varied performance, which may be due to over-hardening of the coating by the hydrophobic fumed silica filler. While the silane-modified acrylic emulsion based paints did not show improved UV resistance in an accelerated QUV test, they do show reduced dirt pickup in an outside weathering test. Surprisingly, the MEMO-modified acrylic emulsion based paints SG2 and M2 exhibited slight cracking and flaking. This work demonstrates the importance of judicious choice of the right silane for the intended application (interior versus exterior). Based on the performance of the paints presented herein, the silane-modified acrylic emulsions appear to be particularly well suited for interior applications. The outstanding adhesion to wet concrete presented herein could withstand pipe leaks and flooding from heavy rain and natural disasters that are increasingly on the rise. This represents a very affordable method for prolonging paint service life under extreme wet conditions and reducing costs associated with removing delaminated paint and repainting. Work is currently underway to understand the differences between the different silane-modified acrylic emulsions, as well as the interaction between the silane-modified acrylic emulsion and the hydrophobic fumed silica filler.