| Résumé : |
Advances in low-temperature cure were introduced recently as well as powders capable of meeting high durability standards such as American Architectural Manufacturers Association (AAMA) 2605 and Qualicoat Class 3 (both require 10 years Florida durability).
To meet these specifications the coating must pass the following tests: dry adhesion, wet adhesion, boiling water adhesion, impact resistance, abrasion resistance, muriatic acid resistance, mortar resistance, nitric acid resistance, detergent resistance, window cleaner resistance, 4000 h humidity resistance, 4000 h salt spray resistance and 10 years South Florida durability with a maximum ΔE color change of 5.0 units and 50% gloss retention.
These architectural specifications represent the most demanding coating requirements for commercial buildings such as skyscrapers and stadiums. In addition, sustainable technologies are emerging based on either recycled plastic feedstocks or biobased raw materials. Moreover, binders exhibiting enhanced corrosion resistance and edge coverage have been recently debuted. Corresponding new developments have occurred in testing and application technology. |
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New advances in powder coating technology in COATINGS TECH, Vol. 18, N° 6 (06/2021)
