What are the advantages of UV curing powders?
As with other powder coatings resins, UV curing resins are solvent-free, emit little or no VOC and can be handled at the formulation and application stage as normal thermosetting powders. Whereas classical powders rely on temperature only for the melting and curing process, these processes for UV curing powders can be regarded as being separate. At the first step after electrostatic application, the melting process can be best performed by IR irradiation in very short times and at temperatures as low as 110°C. During the melting process there is no viscosity increase by the curing reaction resulting in much improved flow. Cure then follows by exposure to UV light within several seconds. Increased productivity and smaller footprint of the coating line makes UV curing powders an attractive alternative to other low bake systems.
Solutions based on UV curing powder coating resins are available for clear coats, pigmented powders for indoor and outdoor applications.
The curing of this group of unsaturated binders by Electron-Beam (EB), Laser and UV-LED will certainly further enlarge the application window in future.
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