Journal of Adhesion and Interface (접착 및 계면)

The Society of Adhesion and Interface, Korea (한국접착및계면학회)
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Curing Properties of UV-LED Curable Color Coating

UV-LED 경화형 칼라 코팅의 경화특성 연구

  • 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)
  • 신찬호 (조선대학교 응용화학소재공학과) ;
  • 김종구 (조선대학교 응용화학소재공학과) ;
  • 홍진후 (조선대학교 응용화학소재공학과) ;
  • 안태정 (조선대학교 광기술공학과) ;
  • 김현경 (조선대학교 응용화학소재공학과)
  • Received : 2012.01.12
  • Accepted : 2012.02.17
  • Published : 2012.01.31
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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.

본 연구는 UV-LED 경화형 칼라코팅에 대한 경화특성에 관한 것으로, 특히 UV-LED 파장(365, 395, 405 nm), 불활성 기체, 증감제 및 Dual curing에 따른 경화성을 평가하였다. 광경화 과정과 코팅 도막의 Film-air (FA) interface와 Film-substrate (FS) interface에서 존재하는 미반응 아크릴레이트에 대한 평가는 Photo-DSC와 FT-IR/ATR을 이용하여 각각 조사하였다. Photo-DSC 측정 결과 발열량과 전환율은 405 nm UV-LED를 이용한 코팅 시스템의 경우가 395 및 365 nm UV-LED를 사용한 경우보다 높게 나타났다. UV-LED 경화형 시스템은 전반적으로 Film-substrate (FS) interface의 경화도가 높은 것으로 나타나 후막경화가 우수함을 알 수 있었으나, Film-air (FA) interface의 표면 경화도는 산소저해 현상으로 인해 매우 낮음을 FT-IR/ATR 결과를 통해 확인하였다. 이러한 낮은 표면 경화도는 불활성 기체인 질소를 사용하거나 Dual curing 방법을 도입함으로써 개선할 수 있었다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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