Drake Coatings Inc

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Description

Powder is a dry form of paint applied by electrically charging the powder and grounding the part. Most powders start out as a liquid, very similar to spray paint. The resin, various components and pigments are mixed into a homogenous solution. They are then partially cured, converted into a solid, extruded and ground to the desired particle size.There is a misconception out there that powder is some space age material similar to high tech ceramics and carbon fiber. Powder is just another method of laying down an organic film such as paint. A coating of epoxy powder will have the same basic properties such as poor UV resistance as a liquid paint.Most powders have very good chemical and corrosion resistance, but again it is resin specific. Epoxies have excellent chemical resistance. Polyesters and Urethanes are typically used for aesthetic coatings and have good resistance. One big advantage that powder has over liquid paint is its curing or drying of the coating. As a liquid coating dries, solvent (VOC's) has to escape from within the film as it cures. While the solvent is evaporating it is leaving small pin holes in the surfaces. This creates an area for moisture and chemicals to penetrate the film and cause corrosion. Powder simply melts at the cure temperature and is not prone to pin holing. Typical powder cure cycles are 350-400°F @ 15-25 minutes.

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