골분 함유 옻의 경화 특성으로 본 골분의 역할*1)
Study on the Function of Bone Powder in the Drying of Asian Lacquer Containing it
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초록
옻은 우리나라에서 옛날부터 도료와 접착제로 사용되어 왔다. 옻에 골분을 첨가해 사용 하기도 했는데, 대체로 순수한 옻층보다 골분 함유 옻층이 두껍다. 두꺼운 옻층에 골분이 혼합 되어 있는 이유에 대해 골분 함유 옻의 경화특성 관찰을 통해 고찰한 연구는 지금까지 없었다. 여기서는 유리판 사이에서 옻을 자연 경화시켜 옻과 골분 함유 옻의 경화현상을 비교함으로써 골분이 옻의 경화에 미치는 영향을 살펴보았다. 옻만 있는 시료는 일정 두께 이상 경화가 어려 웠고 시료의 안쪽은 오랜 시간이 지나도 경화가 일어나지 않았다. 반면, 골분 함유 옻 시료는 순수 옻에 비해 경화가 빨랐으며, 시료의 안쪽까지도 경화가 진행되었다. 골분의 회화 여부, 골분의 크기 및 함량도 옻의 경화에 영향을 미치는 것으로 나타났다. 현미경 관찰에서 옻과 달리 골분 함유 옻에 빈 공간이 산재해 있고 바깥표면에 틈새가 있는 것을 볼 수 있었다. 이로부 터 옻에 포함된 골분이 옻층 내부와 외부를 연결하는 공기 통로 형성을 도와 옻의 경화를 촉진 하는 것으로 판단된다.
Abstract
Asian lacquer has been used as a paint and adhesive since ancient times in Korea. Bone powder was often added to lacquer, and the lacquer layer containing bone powder is usually thicker than the pure lacquer layer. The reason for using bone powder in a thick lacquer layer has not been studied through experiments until now. In this study, the effect of bone powder on the drying of lacquer was investigated by comparing the curing behavior of lacquer and bone powder-containing lacquer by naturally curing lacquer between glass plates. The sample with lacquer only was difficult to dry over a certain thickness, and the inside of the sample did not dry even after a long time. On the other hand, the lacquer samples containing bone powder cured faster than pure lacquer, and the drying progressed even to the inside of the sample. It was found that calcination, size and amount of bone powder also had an effect on drying of lacquer. In microscopic observation, it could be seen that, unlike lacquer, voids existed here and there in the lacquer containing bone powder and there were crevices on the outer layer. From this, it is presumed that bone powder contained in lacquer helps to form an air passage connecting the inside and outside of the lacquer layer and promotes the drying of lacquer.
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