Performance of redispersible polymer powders in wall coatings

This study applied redispersible powder into wall coatings and compared the film microstructure and properties of dry-mixed coatings and corresponding latex coatings. It could be found that the dry-mixed coatings film had loose and uniform structure, while the latex coatings film was dense and had two-layered microstructure. Through the UV–vis spectra and dynamic light scattering, we found that the different microstructures of both coatings films were resulted from the different stability of reconstituted emulsion and original polymer emulsion, and one model was set up to demonstrate this process. The performance of dry-mixed coatings was worse compared with latex coatings, which was due to the weakened stability and adhesive ability of reconstituted emulsion after spray drying.