열화율이 상이한 밀랍지의 초임계유체추출 탈랍처리효과 비교분석 (Comparisons of Effectiveness of the Supercritical Fluid Extraction Dewaxing on the Beeswax-Treated Paper with Different Aging Degrees)

서지정보

· 발행기관 : 한국펄프·종이공학회
· 수록지 정보 : 펄프종이기술 / 46권 / 6호 / 56 ~ 62페이지
· 저자명 : 정혜영, 최경화, 강영석, 고인희, 양은정

초록

This study aims to investigate the applicability of supercritical fluid extraction as a dewaxing techniqueto restore the beeswax-treated volume of the Annals of the Joseon Dynasty in various deterioration anddamage conditions. Thus, this study analyzed the dewaxing efficiency and changes in physical and morphologicalproperties before and after dewaxing, by applying the optimal supercritical fluid extractiondewaxing condition (70℃, 40 MPa, CO2, Co-solvent 20% DCM, 2 hour) to 3 kinds of beeswax-treatedpaper with different deterioration rates (dry artificial aging of 10, 20 and 30 days at 120℃).
After dry artificial aging at 120℃ for 30 days, the average molecular weight of the beeswax-treatedspecimen was 1.856×105 g/mol, showing deterioration about 80% of the beeswax-treated paper beforedewaxing. It was a similar level to the molecular weight of the bees-waxed volume of the Annals of theJoseon Dynasty that has a higher degree of damage. As a result of analyzing the dewaxing efficiencythrough FT-IR analysis, this study discovered that it was possible to effectively dewax beeswax-treatedpaper in the range of deterioration 20 to 80% with this supercritical fluid extraction dewaxing techniqueapplied. As a result of analyzing changes in the physical and morphological properties before and afterdewaxing, the viscosity tended to decrease to a slight degree, and since no morphological deformation or damage of stencil fibers was found, it was concluded possible to conduct stable dewaxing through thissupercritical fluid extraction technique.

영어초록

This study aims to investigate the applicability of supercritical fluid extraction as a dewaxing techniqueto restore the beeswax-treated volume of the Annals of the Joseon Dynasty in various deterioration anddamage conditions. Thus, this study analyzed the dewaxing efficiency and changes in physical and morphologicalproperties before and after dewaxing, by applying the optimal supercritical fluid extractiondewaxing condition (70℃, 40 MPa, CO2, Co-solvent 20% DCM, 2 hour) to 3 kinds of beeswax-treatedpaper with different deterioration rates (dry artificial aging of 10, 20 and 30 days at 120℃).
After dry artificial aging at 120℃ for 30 days, the average molecular weight of the beeswax-treatedspecimen was 1.856×105 g/mol, showing deterioration about 80% of the beeswax-treated paper beforedewaxing. It was a similar level to the molecular weight of the bees-waxed volume of the Annals of theJoseon Dynasty that has a higher degree of damage. As a result of analyzing the dewaxing efficiencythrough FT-IR analysis, this study discovered that it was possible to effectively dewax beeswax-treatedpaper in the range of deterioration 20 to 80% with this supercritical fluid extraction dewaxing techniqueapplied. As a result of analyzing changes in the physical and morphological properties before and afterdewaxing, the viscosity tended to decrease to a slight degree, and since no morphological deformation or damage of stencil fibers was found, it was concluded possible to conduct stable dewaxing through thissupercritical fluid extraction technique.

참고자료

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