New Orleans, Louisiana - Bayer MaterialScience says it is possible to achieve outstanding corrosion resistance for metal surfaces with waterborne polyurethane paint resins.
The company presented a report on "Advances in Waterborne Resins for Metal Coatings with Improved Corrosion Resistance," as part of a corrosion session, held 15 Feb, during the Waterborne Symposium 2012 in New Orleans.
Kathy Allen, Margaret Kendi, and Peter Schmitt, all of Bayer MaterialScience, tested the corrosion resistance of metals coated with waterborne paint resins.
Bayer said in a 14 Feb news release that paints based on one-component (1K) waterborne polyurethanes (PUDs) can "protect metal surfaces and keep them looking good for an extended period of time." It also noted that paints based on 1K PUDs provide "outstanding corrosion resistance along with excellent solvent and abrasion resistance."
During the presentation, Schmitt reviewed the chemistry of PUDs, demonstrated the flexibility of PUD technology and the effect of polymer makeup on corrosion resistance. He also discussed the testing done on 1K waterborne polyurethane and waterborne polyacrylate resins on metal after a variety of pre-treatments with and without a primer.
"Two-component waterborne polyurethane studies showed that good corrosion resistance can be achieved with the proper choice of co-reactants when these systems are applied directly on treated steel panels," said Schmitt, who also pointed out that the formulations with the highest crosslink density provide the best corrosion resistance.