Waterborne Polyurethane-Polyacrylic Ester Hybrid Emulsion for Humidity-Controlling Coatings

Methyl methacrylate, butyl acrylate, acrylic acid and diacetone acrylamide were used as main monomers to prepare polyacrylic ester emulsion (PA). Isophorone diisocyanate, polypropylene glycol and 2,2-dimethylolpropionic acid were used as main monomers to prepare waterborne polyurethane emulsion (PU). Then, a new kind of waterborne polyurethane-polyacrylic ester hybrid emulsion (PUPA) was prepared successfully by physical blend of PA and PU. The structure and chemical components of the waterborne polyurethane-polyacrylic ester hybrid nanoparticles were investigated by transmission electron microscopy, FT-IR spectra and thermogravimetric analysis, respectively. The film properties of PUPA were measured and showed excellent hardness, gloss, water resistance and water absorption. The humidity-sensitive coating (PUPA-C) was prepared from PUPA, pigments and fillers. The basic properties of humidity-controlling coating were investigated, with particular attention to the effects of humidity-controlling. The humidity-controlling coating showed excellent properties of humidity sensitivity and humidity retention.