Abstract
Powder coatings are increasingly applied in various industrial coating applications. In this chapter the effects of particle size and particle size distribution on the manufacturing, application and coating properties of powder coatings are discussed. The chemical composition of thermoplast and thermoset resins and their corresponding powder coating formulations are addressed together with the premixing, extrusion, cooling, chipping, fine grinding, classification and collection steps in the manufacturing process. The resulting particle size and particle size distribution (PSD) of the powder coating have pronounced effects on the application process especially via the fluidized bed and electrostatic spray application. In many steps particle size influences the outcome: fluidization, charging, spray trajectories, layer build-up, adhesion are all affected.
In addition to the above effects, the PSD of coating components like pigments, fillers and additives has a large impact on the final properties of the coatings. This includes proper dispersion in the resin. This PSD is of prime importance since it directly affects properties like flow, degassing color, matting, adhesion and outdoor durability.
The final section addresses the effects of particle size on safety (explosions and worker safety) and sustainability (carbon footprint of powder coatings).
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Notes
- 1.
The image force is the electrostatic force calculated through application of an image field. This field is used to simplify calculation and visualization of the electric field distribution near a conducting surface. The image field is constructed by an imaginary charge, which is the mirror image of the real charge in respect to the surface but has the opposite sign.
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Claase, M.B., Vercoulen, P., Misev, T.A. (2014). Powder Coatings and the Effects of Particle Size. In: Merkus, H., Meesters, G. (eds) Particulate Products. Particle Technology Series, vol 19. Springer, Cham. https://doi.org/10.1007/978-3-319-00714-4_13
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