Preparation of acrylate-based copolymer emulsion and its humidity controlling mechanism in interior wall coatings

In order to investigate the humidity controlling mechanism of an acrylate-based copolymer emulsion (ACE), the storage stable copolymer of a novel waterborne two-pack system was prepared by emulsion polymerization using main monomers and functional monomers, such as acrylic acid (AA) and diacetone acrylamide (DAAM). Influencing factors such as those affecting the coagulum and particle size of the emulsion were investigated. The obtained ACE was characterized by FT-IR spectra and dynamic light scattering (DLS) analysis, and was applied to the preparation of wall coatings with humidity controlling functions, and showed a large capacity for water absorption (274%), increasing indoor humidity and dehumidification in dry or moist environments. Based on analysis of the micro-structure of the coatings and their humidity controlling properties, a humidity controlling mechanism was suggested. The coating properties of the ACE and its film were measured, and showed excellent hardness, gloss and water resistance properties. ACE coatings (ACE-C) exhibited humidity control and excellent moisture retention due to the porous structure of the filler combined with the acrylate-based copolymer.

► A novel acrylate-based copolymer containing keto-carbonyl, amide and carboxyl groups was prepared by emulsion polymerization.
► The obtained copolymer emulsion was applied to prepare interior wall coatings with humidity controlling functions, which could increase indoor humidity or dehumidify in dry or moist environments.
► Based on analysis of the micro-structure of the coatings and their humidity controlling properties, a humidity controlling mechanism was suggested.