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Coatings are utilized in a wide variety of applications (floor, wall, roof, etc.) and on many different substrates (concrete, steel, drywall, etc) in commercial architectural settings, and performance requirements will obviously vary depending on the intended use and environment.
Coatings are utilized in a wide variety of applications (floor, wall, roof, etc.) and on many different substrates (concrete, steel, drywall, etc) in commercial architectural settings, and performance requirements will obviously vary depending on the intended use and environment. Waterborne and 100% solids coatings are often preferred for walls and floors of interior spaces due to their low odor and environmental profile, but the choice of specific coating chemistry will also rely on performance needs such as chemical and stain resistance, adhesion, resistance to abrasion and impact, and UV durability. For example, wall coatings in commercial environments, such as schools and hospitals, are often subjected to greater abuse (both physical and chemical) than coatings on a typical residential wall. More frequent cleaning and use of harsher cleaning agents and chemicals can lead to greater film damage, and call for wall coatings with higher resistance properties. Two-component coatings based on epoxy chemistry typically offer the best resistance to physical and chemical damage due to their crosslinked nature, but have some drawbacks such as poor resistance to damage from UV light. Some common systems used as wall and floor coatings in commercial architecture include 1) waterborne epoxy dispersions crosslinked with amine hardeners, 2) waterborne acrylic dispersions crosslinked with epoxy resins (acrylic/epoxy), and 3) 100% solids systems based on liquid epoxy resins crosslinked with amine hardeners. This paper will compare these currently used technologies with a newly developed, waterborne epoxy hybrid system that combines the best features of each, including the fast property development and ultimate resistance properties of epoxy/amine systems, and quick dry times and excellent UV durability of acrylic/epoxy coatings. Evaluation of the novel epoxy hybrid chemistry in the context of wall and floor coatings for commercial architecture will be described.
Although bridge construction extends back thousands of years, steel bridge painting is in its infancy. The first iron bridge was built in 1779, and the first steel was used in a bridge in 1828. Coated bridges from the 19th century survive, raising the question, “Can coatings protect steel bridges for the next hundred years?” The author discusses how to achieve 100 years of service life using current materials and offers recommendations for improving steel bridge painting.
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Humans have been building shelters since before recorded history. Throughout the ages mankind’s primary objective remains the same: to keep water out of the shelter. Water is the most aggressive combatant in the fight to protect our structures. Buildings leak for a variety of reasons.
The polarity of the zinc-steel galvanic couple in hot aqueous solutions was published more than 20 years ago. It used an inorganic zinc primer coating that was applied under thermal insulation at elevated temperatures [30C-60C (86F-140F)]. Since the year 2000, industrial practices or standards do not recommend using inorganic zinc rich coatings under thermal insulation. Research has showed over the years that good practice of corrosion prevention under insulation is to apply an additional layer of a heat resistant modified epoxy or inorganic polymer coating as an additional barrier.