Journal of Adhesion and Interface (접착 및 계면)

The Society of Adhesion and Interface, Korea (한국접착및계면학회)
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Physical Properties of UV-Curable Powder Coatings with Different Photoinitiator Contents

광개시제의 함량에 따른 UV 경화형 분체도료의 물리적 특성

  • Moon, Je-Ik (Lab. of Adhesion & Bio-Composites, Program in Environmental Materials Science, Seoul National University) ;
  • Choi, Jae-Hoon (Lab. of Adhesion & Bio-Composites, Program in Environmental Materials Science, Seoul National University) ;
  • Hwang, Hyun-Deuk (Lab. of Adhesion & Bio-Composites, Program in Environmental Materials Science, Seoul National University) ;
  • Kim, Hyun-Joong (Lab. of Adhesion & Bio-Composites, Program in Environmental Materials Science, Seoul National University) ;
  • Kim, Nam-Hong (R&D center in Chokwang Paint Ltd.)
  • 문제익 (서울대학교 산림과학부 환경재료과학전공) ;
  • 최재훈 (서울대학교 산림과학부 환경재료과학전공) ;
  • 황현득 (서울대학교 산림과학부 환경재료과학전공) ;
  • 김현중 (서울대학교 산림과학부 환경재료과학전공) ;
  • 김남홍 (조광페인트(주))
  • Received : 2008.06.09
  • Accepted : 2008.06.16
  • Published : 2008.06.30
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Abstract

A series of UV-curable powder coatings with different contents of photoinitiator (0.5 wt%, 1 wt%, 2 wt%) were formulated and measured gel content, tensile strength of cured film. Heat-sensitive substrates such as MDF, plywood and PVC were coated UV-curable powder and cured coatings were measured physical properties by pendulum hardness tester, glossmeter, pull-off adhesion tester. With increasing photoinitiator content, adhesion force between coating and substrate decreased because of crosslinking density increasing. The results of pendulum hardness was not significantly changed but gloss was changed according to different substrates. Adhesion of UV-curable coatings was enough to apply for heat-sensitive substrates. From these results, we concluded that contents of photoinitiator was a effective factor in UV-curable powder coatings. UV-curable coatings was a portential candidate for heat-sensitive substrates.

광개시제 함량이 0.5 wt%, 1 wt%, 2 wt%인 UV 경화형 분체도료를 배합하고 낮은 온도에서도 용융되는 수지를 선택하여 열민감성 기재에 적용이 가능함을 알아보았다. 열민감성 기재로는 PVC와 목재제품(MDF, 합판 등)을 선택하여 표면경도, 광택, 부착력을 통해서 기재와의 상관관계를 알아보았다. 광개시제 양이 증가할수록 가교밀도가 증가하여 도막이 brittle해지는 경향을 보였고, 그에 따라 부착력이 감소하였다. 열민감성 기재에 적용한 결과, 표면경도는 기재에 영향을 받지 않았지만 광택은 기재에 따라서 차이가 나타났다. 그리고 UV 경화형 분체도료의 부착력은 열민감성 기재에 적용하기에 충분하였다. 본 연구 결과, UV 경화형 분체도료에서 광개시제 함량이 중요한 인자이며 열민감성 기재에 적용이 가능함을 확인하였다.

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