Journal
PROGRESS IN ORGANIC COATINGS
Volume 64, Issue 4, Pages 474-481Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2008.08.009
Keywords
Coatings; Nanocomposite; UV curing; Matting; 172 nm excimer lamp
Funding
- German Federal Ministry of Education and Research (BMBF) [02PU2491]
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For UV-curable acrylate coatings reinforced by silica nanoparticles, the effect of 172 nm excimer irradiation on the surface roughness has been studied. A dual UV lamp set-up consisting of a 172 nm excimer lamp and a mercury arc lamp allowed obtaining gloss levels down to 0.5 units (at 601) depending on the acrylate formulation and curing conditions. Moreover, UV matt-finished sample showed enhanced surface hardness and increased chemical resistance. It is assumed that 172 nm excimer irradiation resulted in a higher network density via additional cross-linking reactions. To study the depth profile of acrylate conversion for coatings cured by the combination of a 172 nm excimer lamp (accountable for surface curing) and a mercury arc lamp (responsible for through curing), FTIR microscopy as well as (Ge)ATR-FTIR having an IR penetration depth of less than 0.5 mu m have been applied. Providing the presence of a photoinitiator as well as the absence of oxygen inhibition, similar degrees of double bond conversion of about 90% were observed on the entire area of the cross-section of the coating, i.e. the wavelength of UV irradiation was found to have no significant impact on acrylate conversion. (C) 2008 Elsevier B.V. All rights reserved.
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