Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Dimensional Stability of Archaeological Waterlogged Salix koreensis Andersson Treated with Recycled PEG

재활용 PEG를 이용한 수침 고버드나무의 치수안정화 연구

  • Yang, Seok-Jin (GaYa National Research Institute of Cultural Heritage) ;
  • Lee, Soo (Department of Chemical Engineering, Changwon National University) ;
  • Kim, Jong-Hwa (Department of Chemical Engineering, Changwon National University)
  • 양석진 (국립가야문화재연구소) ;
  • 이수 (창원대학교 공과대학 화공시스템공학과) ;
  • 김종화 (창원대학교 공과대학 화공시스템공학과)
  • Received : 2014.11.10
  • Accepted : 2014.12.23
  • Published : 2014.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

Archaeological waterlogged woods require a process of dimensional stabilization for their conservation. PEG is the most widely used in the conservation of archaeological waterlogged wood. One of the easiest and commonly used methods is the impregnation of 40% polyethylene glycol followed by vacuum freeze drying. However, the waste fluid produced from the PEG treatment is black in color and has a severe odor due to the organic matter extracted from the wood. Thus It cannot be recycled and it was just thrown out. Color of waste fluid can be decolored with oxidation reaction by hydrogen peroxide. Properties of PEG before and after preservation treatment, and after oxidation with $H_2O_2$ were not changed. Dimensional stability of archaeological waterlogged Salix koreensis Andersson was studied with pure or recycled PEG. The ratio of impregnation solutions were 10:0, 7:3, 5:5, 3:7, 0:10 (pure PEG : recycled PEG). Impregnation process was carried out by putting the wood specimens 10% PEG solution for 5days, 20% for 5 days, 30% for 5 days finally 40% for 5 days. All of the specimens showed the weight change rate of 25%. SEM results provided that the dimensional change of were less than 4% PEG impregnated specimens. Comparing with pure PEG impregnation system, conservation precess mixed PEG also showed no significant changes. Conclusively, the recycled PEG can be used for archeological waterlogged wood conservation precess.

수침고목재는 보존을 위해 치수안정화의 공정이 필요하다. PEG는 목재의 치수안정화에 가장 보편적으로 사용된다. PEG 40% 함침 후 동결건조 하는 방법은 간단하고 일반적인 방법중 하나이다. 그러나 PEG처리 후 폐액은 목재로부터 침출된 유기물에 의해서 검게 변하고 악취가 발생하기 때문에 재활용되지 못하고 폐기되었다. 폐액은 과산화수소의 산화작용에 의해 폐액의 검은색은 제거 가능하다. PEG는 보존처리 전, 후와 과산화수소의 산화작용 후에도 그 물성이 변하지 않아 재활용이 가능하다. 과산화수소에 의해 재활용된 PEG를 이용하여 수침고목재의 치수안정화에 대한 실험을 실시하였다. 치수안정화에 사용된 용액의 PEG와 재활용 PEG의 비율을 10:0, 7:3, 5:5, 3:7, 0:10 (pure PEG : 재활용 PEG)으로 하였다. 그리고 수침고목재를 용액의 농도 10, 20, 30, 40%로 각각 5일간 함침하였다. 모든 시험편은 25%의 중량 증가율을 보였으며, SEM을 이용하여 목재 내부 세포를 관찰한 결과 PEG의 함침은 매우 잘된 것으로 판단된다. 치수변화율은 4%이하로 모든 시료 동일하게 안정된 수치를 나타내어 재활용 PEG를 사용하여 보존처리하는 것은 새 PEG를 사용하는 것과 다르지 않은 결과를 나타내었다.

Keywords

References

  1. I. J. Kim, "Characteristics and PEG-treatment of ancient wrecked woods excavated in Korea", Doctor's thesis of Graduate School of Chonnam National university, (2004).
  2. Y. S. Kim, K. N. Choi, Micro morphological aspects of hardwoods deteriorated in the sea-water from wrecked ship's timer, Conservation Studies, 7, 276 (1986).
  3. S. O. Jung, A. R. Jung and S. J. Yang, An investigative report on excavating the fortress of seongsan IV, GaYa National Research Institute of Cultural Heritage, Changwon, 2, p384-385, (2011).
  4. S. Y. Baek, "Study on the dimensional stabilization of archaeological waterlogged wood using cetyl alcohol treatment", Master's thesis of Graduate School of Kyungpook National University, (2012).
  5. Y. H. Yi, Conservation of waterlogged wooden finds excavated in wet-site, J. of the Kor. Soc. of Conservation sci. for Cultural Properties, 6, 126-140 (1997).
  6. Y. S. Kim, J. W. Bang, I. J. Kim, and K. N. Choi, Chemical composition of archaeological woods submerged in the seawater, J. Korean Wood Sci. & Tech., 18(2), 3 (1990).
  7. Y. S. Jin, A study on the investigation and removal the cause of blacken effect of waterlogged archaeological woods, Munhwaje, 40, 414 (2007).
  8. S. C. Kim, W. K. Park, and Y. H. Yi, Dimensional Change of PEG-Freeze Dried Waterlogged Woods Exposed at Various Humidity Conditions, J. of Conservation Science, 16, 110 (2004).
  9. S. J. Yang, "A study on the treatment method for the conservation of waterlogged camphor tree artifacts and the recovering process of waste fluids", Doctor's thesis of Graduate School of Changwon National University, (2005).
  10. R. Endo, K. Kamei, I. Iida and Y. kawahara, Dimensional stability of waterlogged wood treated with hydrolyzed feather keratin. Archaeological Science, 35, 1240 (2008). https://doi.org/10.1016/j.jas.2007.08.011
  11. S. C. Kim, Compressive strength of waterlogged archaeological wood after PEG treatment with concentration and solvent", J. of Conservation Science, 28(2), 95 (2012).