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Emerald Group Publishing Limited
Copyright © 2010, Emerald Group Publishing Limited
Ultra Green Bayhydrol UH PUDs with renewable content
Article Type: New products From: Pigment & Resin Technology, Volume 39, Issue 1
“Generally, coatings formulated with PUD resins offer high mechanical strength, which makes them ideal for use on all types of wood floors,” Schmitt continued. “For instance, the addition of high-molecular-weight, fatty acid-modified Bayhydrol UH 2557 and 2593/1 polyurethane raw materials enable coatings to dry quickly, be highly resistant to black heel marks and accentuate the wood's grain.” When used in combination with waterborne UV-cure PUDs and two-component waterborne coatings, Bayhydrol UH 2593/1 PUD accelerates drying and thus can contribute to increased productivity during the coating process. Schmitt added, “The renewable content of Bayhydrol UH 2557 resin is 7 percent and the renewable content of Bayhydrol XP 2593/1 resin is 9 percent.”
Bayer's Bayhydrol UH 2558 resin, which can be used effectively with polyacrylate resins, helps produce coatings that are particularly flexible, yet are scratch, mar and chemical resistant. The addition of only 2.5 percent diethyleneglycol monobutylether is required for optimal film formation on wood at room temperature. That is only about one-quarter of the co-solvent required for a formulation based on a comparable resin containing N-methylpyrolidinone.
All of these PUDs from Bayer's Bayhydrol UH line are very compatible with other waterborne resins such as polyacrylate systems. The already outstanding chemical and alkali resistance of coating systems formulated with them can be further enhanced by crosslinking with polyisocyanates. The combination of Bayhydrol UH XP 2719 PUD with polyol dispersions in two-component formulations improves both the drying time and flexibility of the coating. “Polyurethane dispersions offer incredible flexibility to today's formulators,” Schmitt added. “Used alone or in combination with other resins, they really raise the bar of performance possibilities.”
As with any product, use of any of the Bayhydrol UH resins mentioned, in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.