Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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A Study on Transparency and Characteristics of Natural Adhesives Made of Urushiol and Glue

우루시올과 아교를 배합한 천연 접착제의 투명성 및 접착 특성 연구

  • Kim, Eun Kyung (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Ahn, Sun Ah (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Jang, Sungyoon (Restoration Technology Division, National Research Institute of Cultural Heritage)
  • 김은경 (국립문화재연구소 복원기술연구실) ;
  • 안선아 (국립문화재연구소 복원기술연구실) ;
  • 장성윤 (국립문화재연구소 복원기술연구실)
  • Received : 2015.05.18
  • Accepted : 2015.06.10
  • Published : 2015.06.20
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Abstract

This study aims to increase the transparency of the natural adhesives made with lacquer and glue. For the purpose, samples were prepared by mixing urushiol with glue in varied proportion and the characteristics and adhesive properties were investigated. By adding glue on urushiol, IR spectra of the natural adhesives became similar to that of glue as the N-H band related with protein of glue increased, while that of methylene C-H bond related to urushiol decreased. Samples were dried within a day and maintained a bright color without blackening by oxidation during the curing process. The natural adhesives with urushiol and glue showed various range of viscosity and tensile shear strength as Cemedine C or Epoxy resin according to mixing ratio. In addition, the sample of mixing ratio of 6:4 showed bright and transparency in appearance and tensile shear strength similar to that of Araldite AY103-1/HY956 for earthenware layer.

본 연구는 옻과 아교를 배합한 천연 접착제의 투명성을 높이기 위해 옻에서 추출한 우루시올과 아교를 배합하여 천연 접착제를 제조하고 물성 및 접착특성을 파악하였다. 우루시올과 아교를 배합한 천연 접착제는 아교의 배합비율이 증가할수록 아교 단백질과 관련된 N-H 피크들이 생성되고 강도가 증가하는데 반해 우루시올의 메틸렌 결합과 연관된 C-H 피크는 줄어들어 아교의 IR spectra와 유사해지는 경향을 나타냈다. 배합에서 아교의 비율이 증가할수록 색이 밝고 투명해지며 경화 과정 중에도 검게 산화하지 않아 투명성을 높이는 동시에 하루 이내에 건조하며 옻과 아교를 배합한 천연 접착제의 특성은 유지하였다. 배합비율에 따라 Cemedine C부터 에폭시 수지까지 다양한 범위의 점도와 접착 강도를 나타내며 그 중 토기를 피착재로 한 실험에서 우루시올과 아교를 6:4로 배합한 시료가 밝고 투명한 색을 가지는 동시에 Araldite AY103-1/HY956과 유사한 강도를 보여 토기 유물에 적용 가능한 천연 접착제로서의 가능성이 기대된다.

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