Thermosetting powder coating are much more widely used
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Thermosetting powder coating are applied by the electrostatic spray process, heated to the necessary temperatureand cured and are primarily composed of relatively high molecular weightsolid resins and a crosslinker.The formulation of thermosetting powders contain the primary resins:Epoxy,Polyester,Acrylic.
These primary resins are used with different crosslinkers to produce a variety of powder materials. Many crosslinkers, or cure agents, are used in powder coatings, including amines, anhydrides, melamines, and blocked or non-blocked isocyanates.Some materials also use more than one resin in hybrid formulas.
When a thermoset powder is applied and subjected to heat it will melt, flow and chemically crosslink to form a finished film.The chemical reaction in the cure cycle creates a polymer network that provides excellent resistance to coating breakdown. A thermoset powder that has cured and crosslinked will not melt and flow again if subjected to heat a second time.