Abstract
Two-pack water-borne polyurethane coatings are a relatively new technology which promises excellent performance properties combined with a low content of volatile organic compounds (VOCs). In this paper the effects of a polymer structure of acrylic polyol dispersions on film-formation and final coating properties (pot life, hardness, gloss) are investigated. Two kinds of water-borne acrylic polyols have been investigated. Both water-borne polyols show good results in applicability, hardness and chemical stability when elevated temperatures can be used. The polyol based on a single-step synthesis route is superior in pot life, hardness and chemical stability. The low paint VOC of 130g/l indicates that this polyol already fits demands of future VOC regulations.
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