야외 청동 조형물 표면 보존을 위한 다중코팅 적용성
Applicability of Multi-coating for Preserving Surfaces of Outdoor Bronze sculptures
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초록
야외 청동 조형물 표면 코팅에 사용되는 Wax는 대기오염물질 등 환경변화에 의해 재료의 노화, 표면 갈라짐, 백화현상이 나타나 표면 코팅 처리 주기가 짧아지고 있다. 이러한 재료적한계를 개선해보고자 Acrylic resin과 Wax를 함께 사용하는 다중코팅 방식에 대해 국내 야외환경에서의 적용 가능성을 확인해 보았다. 실험 결과 다중코팅 방식은 기존의 Wax 단일코팅방식과 비교하였을 때 코팅층의 내구성, 외부 열화 인자에 대한 내후성, 부식 방지 능력, 접촉각등이 크게 향상되었고, 색도 변화율(ROC)이 낮아 안정성이 입증되었다. 특히 Acrylic Urethane과 Bowling Alley Wax 를 사용한 Acrylic resin + Wax 이중코팅 방식은 다중코팅 내에서도 가장 안정적인 코팅 방식으로 확인되었다. 이러한 결과 다중코팅 방식은 Wax 단일코팅의 단점을 보완해 국내 야외 환경에서도 청동 조형물의 장기 보존성을 확보하고 원형을 보존하며, 재처리 주기를 향상시켜 줄 수 있는 새로운 표면코팅 처리법으로 제시할 수 있음을 확인하였다.
Abstract
The wax used for surface coating of outdoor bronze sculptures is prone to material aging, surface cracking, and whitening due to environmental changes and air pollutants, leading to a shortened coating treatment cycle. To improve these material limitations, I explored the possibility of applying a multi-coating method that uses both acrylic resin and wax in an outdoor environment in Korea. The results of the experiment showed that the multi-coating method significantly improved the durability of the coating layer, weather resistance against external degrading factors, corrosion prevention ability, and contact angle, etc. compared to the existing wax-only coating method, and the rate of color change (ROC) was low, proving its stability. Especially, the double-coating method of acrylic resin and wax using acrylic urethane and Bowling Alley Wax® (acrylic resin + wax) was found to be the most stable coating method among the multi-coating methods. According to such results, I found that the multi-coating method can be proposed as a new surface coating treatment method that can secure long-term preservation of bronze sculptures and preserve their original form even in outdoor environments in Korea, by remedying the shortcomings of the wax-only coating.
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