At A Glance"Improved resin technology continues to lead to new advances in water-based coatings that are VOC compliant..."
New VOC limits are at the doorstep in many states and Sherwin-Williams has been ready with proven coatings products designed to meet limit proposals, which could cap VOCs at 250 g/L in some areas and 340 g/L nationally over the next two years.
While the products achieve a primary goal of compliance, applicators and owners will enjoy performance benefits as well, according to Tony Lambrosa, technical manager for Sherwin-Williams Protective and Marine Coatings.
“In our 100-percent solids coatings that are both water and solvent free, you’ll see better edge retention, a faster cure time, thicker film builds and better chemical resistance and substrate protection than in the solvent-borne alternatives,” says Lambrosa.
Lambrosa cites Fast Clad ER Epoxy, for example, as a 100-percent solids coating that offers improved performance attributes due to newer, proprietary resin technologies. The epoxy amine coating is engineered for immersion service and is an appropriate application for ballast tanks, tank linings and pipe coatings. The coating promises greater than 70-percent edge-build retention and rapid return-to-service properties including foot traffic at 4 hours, and return to service in 24 hours.
“The rapid-cure characteristics are where we are differentiating ourselves in the market,” says Lambrosa.
Such coatings require plural-component application equipment, and Sherwin-Williams has collaborated with equipment manufacturers in the development of their equipment. Both the resin and the curing agent in high-solids coatings need to be heated to reduce viscosity and plural-component equipment doesn’t mix the components until they meet in the nozzle or the mixing chamber of a spray gun. Mixed components have a short pot life of 6 to 7 minutes at 77 degrees F, so developing application equipment has been a challenge, according to Lambrosa. And the units can be costly.
Lambrosa, however, notes that equipment has been improving steadily as well.
“Plural component units have been around for a while, but we’re starting to see them getting smaller with better general workability,” he says. “Advances in equipment continue to improve mix-ratio performance and further ensure successful applications of 100-percent solids coatings.”
Lambrosa reports that improved resin technology continues to lead to new advances in water-based coatings that are VOC compliant. Pro Industrial 0 VOC Acrylic, for example, is a HAPS free, ambient cured, single component acrylic coating designed for interior and exterior industrial and commercial applications.