UV CURING AND MATTING OF NANO/MICRO COMPOSITE MATERIALS

摘要

For UV-curable acrylate coatings reinforced by silica nanoparticles.the effect of type of photoinitiator.photoinitiator content,and curing at-mosphere on surface hardness has been studied.Increasing photoinitiator content yielded higher acrvlate conversion but a lowering of surface hardness.Thus,irradiation under oxygen-depleted conditions with a lower amount photoinitiator can be recommended rather than an excess of photoinitiator for curing in air.Compared to nanocomposite materials,coatings reinforced by both nanoparticles and corundum microparticles exhibit markedly improved scratch and abrasion resistance.UV-curing by the combination of an excimer lamp and a mercury arc lamp yielded a matt effect.This dual lamp set-up allowed to obtain gloss levels down to 0.5 units (at 60) depending on the acrylate formulation and curing conditions.FTIR mi-croscopv has been applied to study the acrylate conversion by the dual lamp curing.