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http://dx.doi.org/10.17702/jai.2014.15.3.116

Parametric Study on Gloss Property of UV Curable Coated Steel  

Hwang, Dong Seop (Department of Applied Chemistry, Kyungpook National University)
Cho, Dong Chul (Department of Applied Chemistry, Kyungpook National University)
Yoo, Hye Jin (Technology Research Group, POSCO)
Kim, Jong Sang (Technology Research Group, POSCO)
Cheong, In Woo (Department of Applied Chemistry, Kyungpook National University)
Publication Information
Journal of Adhesion and Interface / v.15, no.3, 2014 , pp. 116-122 More about this Journal
Abstract
This work deals with the effects of different oligomers, monomers, photoinitiators, and steel plates on the variation of gloss for UV coated steel plates at $20^{\circ}$ and $60^{\circ}$ (ASTM D523). The gloss value was more significantly varied with $20^{\circ}$ angle as compared with $60^{\circ}$. No substantial change in gloss was observed for the type of single oligomer; however, the gloss varied with the mixing ratios of oligomers, type and mixing ratio of monomers, type and concentration of photoinitiator, and type of steel plate. The maximum gloss value was observed when the mixing ratio of polyurethane acrylate (UA) to epoxy acrylate (EA) was 70 : 30, the mixing ratio of trimethylolpropantriacrylate (TMPTA) to tetrahydrofurfurylacrylate (THFA) was 5 : 5, the content of the mixed oligomer (UA : EA = 70 : 30) was 90 wt%, respectively. Darocur MBF of liquid type showed better gloss property than the solid type of Irgacure 184, and the gloss was decreased as the concentration of Darocur MBF increased from 1 to 4 wt%. Regarding the type of steel plate, GI steel plate showed better gloss property as compared with EG and primer-coated steel plates. The maximum gloss values of 95 GU and 120 GU, respectively, at $20^{\circ}$ and $60^{\circ}$ angles throughout the parametric study in the absence of leveling agents enhancing the gloss.
Keywords
UV curable; coated steel; gloss; leveling agents; wettability;
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