Compounding machinery for Powder Coating

Powder coatings today mainly comprise thermosetting powders applied electrostatically. Afterwards they are baked to initiate curing by crosslinking according to the specific surface requirements. These can be functional and/or decorative, with an enormous range of colours in matt, semi-gloss or high-gloss finish as well as metallic, structural and soft-touch effects. Functional powder coatings feature a range from antibacterial characteristics to corrosion protection. Main applications are metal coating in general, household appliances, facades, furniture and automobiles, as well as highway reinforcing bars and oil pipeline coatings.

Polymer powder coatings came into use in the mid twentieth century. They were first applied by the whirl sinter process to a preheated workpiece immersed in a whirlbath of powder coating particles. This was and still is used for high coating thicknesses up to 500 μm.

Thermoplastic powder coatings were the main material to start with, followed gradually in the 1960s by thermosets: epoxy, epoxy-polyester hybrid, polyester/PRIMID, polyester/TGIC, polyurethane, and acrylate based formulations.

Apart from their excellent surface coating qualities, powder paints have several other advantages as well. First of all they need absolutely no solvents, with or without VOCs. This makes the entire powder coating process clearly superior to other systems with regard to application and utilization efficiency (up to 95%) as well as environmental and energy relevant aspects. Another important advantage is the clearly defined thickness of each coating.