Waterborne polyurethane-acrylic copolymers crosslinked core-shell nanoparticles for humidity-sensitive coatings

► A novel waterborne polyurethane-acrylic crosslinked core-shell particle was prepared. ► The formation mechanism of crosslinked core-shell structure was given. ► The scrub resistance of the coatings could be up to 1250 times. ► The humidity controlling coatings showed excellent humidity-sensitive property.