Oak Bridge, Illinois -- Use of waterborne polyurethane technology is increasing in coatings for construction, automotive, and in protective and industrial metal types.
Bayer MaterialScience llc's Peter Schmitt, senior technology manager in the Coatings, Adhesives and Specialties group, has looked at the effectiveness of these materials versus traditional types, and concludes that, "Paints based on one-component waterborne polyurethanes can successfully protect metal surfaces and keep them looking good for an extended period of time."
Schmitt presented his work at Coatings Trends & Technologies 2011 in a paper co-authored by Margaret Kendi, associate research scientist, Bayer MaterialScience.
The Bayer team explained that coatings formulators desire corrosion protection for the substrate, adhesion to various types of metal substrates, ease of application and exterior durability, when choosing a direct-to-metal coating.
According to Schmitt, the advantages of one-component, waterborne coatings for direct-to-metal applications include low volatile organic compound (VOC) levels, low odour, ease of field repair and low energy requirements. He compared the performance waterborne polyurethane and waterborne polyacrylate direct-to-metal resins as well as blends of waterborne polyurethane and polyacrylate resins, in applications requiring corrosion-resistance.
Both waterborne polyurethane and polyacrylate resins display excellent humidity resistance and waterborne polyurethane coatings showed superior corrosion resistance with a single coat, making them an ideal choice for formulators looking for corrosion-resistant, direct-to-metal coatings.
Coatings Trends & Technologies was held 13-14 Sept 2011, at the Double Tree Hotel Chicago in Oak Brook, Illinois, sponsored by Paint & Coatings Industry Magazine and the Chicago Society for Coatings Technology.