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http://dx.doi.org/10.17702/jai.2012.13.1.031

Curing Properties of UV-LED Curable Color Coating  

Ho, Shin-Chan (Department of Polymer Science and Engineering, Chosun University)
Kim, Jong-Gu (Department of Polymer Science and Engineering, Chosun University)
Hong, Jin-Who (Department of Polymer Science and Engineering, Chosun University)
Ahn, Tae-Jung (Department of Photonic Engineering, Chosun University)
Kim, Hyun-Kyoung (Department of Polymer Science and Engineering, Chosun University)
Publication Information
Journal of Adhesion and Interface / v.13, no.1, 2012 , pp. 31-37 More about this Journal
Abstract
In this study, we investigated the curing properties of UV-LED curable color coating. Specially, the effects of UV-LED wavelength (365, 395, and 405 nm), inert gas, the concentration of photosensitizer, and dual curing on the curing behavior of UV-LED coating systems were studied. The photopolymerization behaviors and the unreacted acrylate groups at Film-air (FA) interface and Film-substrate (FS) interface were investigated by photo differential scanning calorimetry (Photo-DSC) and Fourier-transform infrared spectroscopy with attenuated total reflection (FT-IR/ATR), respectively. Photo-DSC results showed that the heat flow and the ultimate conversion for coating system cured by 405 nm UV-LED were higher than the corresponding values for coating systems cured by 395 and 365 nm UV-LED. FT-IR/ATR results showed that the UV-LED curing systems improved interior and through curing of the coating film, but significantly are affected by oxygen inhibition at FA-interface. The inert environment such as nitrogen purging and the dual curing improved the surface and interior curing of the coating films.
Keywords
UV-LED; Color coating; Photo-DSC; Photopolymerization; FT-IR/ATR;
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