Appliance coating developments powder coatings

Application of Topcoats Appliance Coating Specifications Recent Developments Flow Coat Conversion Electrocoating High Solids Powder Coatings Low Energy Cure Coatings Coatings to Replace Porcelain Future... 

Thus, numerous low-emission paints have been developed, including high-solids paints, waterborne paints, aqueous dispersions for industrial use, powder coatings, and radiation-curing coatings. At the forefront in adopting these environmentally friendly products is heavy industry, in particular the automobile and household appliance industries. Medium-sized and smaller businesses will profit from this experience, adapting it for their own needs. 

The paint is further thinned with Solvesso 100 to a viscosity of around 25 seconds for application. This will require typically 15-20% solvent, giving a volume solids at application of circa 33% and this factor, probably above all others, has led to the replacement of acrylamide acrylics by powder coatings for the coating of cabinets of domestic appliances in Europe and North America. If it were not for the issue of VOC reduction, this technology would continue to compete successfully with powder coatings and will probably do so in developing countries where VOC constraints are not yet an issue. 

Coating powders for exterior use are mainly based on the SP-TGIC system. Of some importance is the SP-PUR system, i.e., the combination of hydroxy-functional polyester resins with caprolactam-blocked isocyanate adducts (primarily based on isophorone diisocyanate). The newly developed SP-HAA and SP-glycidyl estermix systems avoid the problems of TGIC as regards toxicology. Acrylic resins are of importance mainly in the United States (AY-PUR) and in Japan (AY-DDA). The AY-PUR system is used for automotive components and in domestic appliances. The PUR systems based on uretdione (a dimerization product of isocyanates) do not... 

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