Coil coating is an environmentally friendly and desirable coating process compared to powder coating and waterborne coating processes. The base resin used for coil coating is mainly polyester resin and PVC plastisol, and there are less PVDF, epoxy and acrylic resins. The tasks and opportunities currently facing the coil coating industry are the development of halogen-free thick coating systems. Powder coatings suitable for wide band metal coating are a step toward this goal. Most coil coating lines still do not use roller coating of liquid coatings. For this purpose, halogen-free organosols and plastisol formulations are being developed. These new varieties can also be used to make thick film coatings.
The use of polyester resins in coil coatings is so predominant because of the great flexibility of their formulations, which can be carefully designed to meet the requirements of this industrial branch. The current development theme is thick film coating systems and improved weatherability of polyester coatings. Epoxy resins are very suitable for primers and can coatings because of their special structural effects. However, due to the UV sensitivity of epoxy resins, it has been rendered unsuitable in many applications.
Acrylic resin has been slightly reprocessed according to the requirements of the coil sector, although some types themselves are suitable. Halogen-free thick film systems may become popular again. Polyamide fine powder as an upgraded component of coil coatings and fluorine-containing resins for special weather-resistant coatings are receiving special attention in the coil coating field.
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