Abstract
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.
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