Abstract
Combining ultraviolet (UV) curing with powder technology opens up new opportunities, which allows UV powder to be used for coating non-metal substrates like medium-density fibreboard. The resin formulation is made up of oligomers and monomers which contain polymerisable double bonds. Photoinitiators are therefore required to initiate the polymerisation. The development of bisacylphosphine oxide ‘BAPO’ photoinitiators permits the through cure of high build pigmented powder coatings. α-hydroxy-ketone ‘AHK’ photoinitiators have a synergistic effect with the BAPO to deliver enhanced technical performance with minimal negative effect on shelf stability. The focus of this paper is to show the curing possibilities with two different resin systems at various TiO2 loadings and thickness of smooth white finishes for medium density fiberboard.
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