Highly Penetrable Silicone Emulsion for Water-Repellent Concrete with Reserved Surface Recoatability

Highly stable and permeable silicone emulsions were prepared by encapsulating N-octyl triethoaysilane microdroplets into micelles of NH2-PDMS/SiO2. The conversion of siloxane to sub-1 µm emulsions, on one hand, endows the concrete with a highly hydrophobic internal surface. While, its outside surface maintains relatively high surface energy, which is beneficial for the post-coating of other polymers. As a result, the coated concreted can simultaneously acquire water repellency and low permeability. The utilization of water-dispersed silicone emulsions, on the other hand, is beneficial for the environmental protection. Thus, this work offered a green procedure for the comprehensive protection of concrete.