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Tgic Free Polyester Powder Paint
FEIHONG
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Powder Coating Process
The powder coating process has established itself since its inception in the late 1940s and involved spraying the powder onto an item using an electrostatic spray gun, charging the powder and causing it to be attracted to the item in a thin layer. With the item heated beyond the melting point of the powder prior to application the powder melts and adheres to the surface as a thin, paint-like layer.
It is during this process that thermoset powders show why they are so useful. As the powder heats and melts, it flows around the surface of the object being coated, and undergoes a chemical change called cross-linking, which forms a tough, solid surface that protects the object being coated.
It is this process, with the chemical change, that make thermoset powder an effective coating for all kinds of objects, providing a number of protective qualities as well as visual appeal. The exact nature of the protection depends on the type of thermoset powder being used, with different formula being chosen depending on the requirements for the coating project.
There are several types of thermoset powder, derived from epoxies, acrylics, hydroxyls (polyester) and carboxyl (polyurethane) groups, although the most common are epoxy and polyester based options. Epoxy resin based thermoset powders form a tough impact resistant coating that has excellent corrosion resistance, however they also tend to display poor UV resistance, so are most frequently used for internal applications as the color and gloss finish tend to degrade quite quickly when exposed to direct sunlight.
Polyester-based coatings share the same tough performance once cured, but are highly UV resistant, making them an ideal choice for outdoor applications. Other forms of thermoset powder have a variety of performance capabilities that are used for specific situations.
Acrylic-based thermoset powders form a beautiful, thin glossy coating that has excellent UV resistance, and offer good chemical and corrosion resistance too, but are less hard wearing than other options. Great for outdoor use, but not in areas where they would attract a lot of wear, such as handrails and similar.
For thermoset powders based around polyurethane resin, they produce excellent, hard-wearing coatings with high gloss resilience, and present a versatile option that performs well in most applications.
Getting the best performance from any powder coating requires choosing the right materials, and thermoset coatings are no different in this regard.
