Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Efficacy of Wood Preservatives Formulated with Okara and Its Microscopic Analysis

두부비지 방부제의 방부효능 및 현미경적 분석

  • Kim, Ho-Yong (Department of Forest Science, College of Agriculture and Life Sciences, Seoul National University) ;
  • Choi, In-Gyu (Department of Forest Science, College of Agriculture and Life Sciences, Seoul National University) ;
  • Ahn, Sye Hee (Department of Forest Resources, Daegu University) ;
  • Oh, Sei Chang (Department of Forest Resources, Daegu University) ;
  • Youn, Young Ho ;
  • Yang, In (Research Institute for Agriculture and Life Sciences, Seoul National University)
  • 김호용 (서울대학교 농업생명과학대학 산림과학부 환경재료과학전공) ;
  • 최인규 (서울대학교 농업생명과학대학 산림과학부 환경재료과학전공) ;
  • 안세희 (대구대학교 생명환경대학 산림자원학과) ;
  • 오세창 (대구대학교 생명환경대학 산림자원학과) ;
  • 윤영호 ((주) KCI) ;
  • 양인 (서울대학교 농업생명과학연구원)
  • Received : 2008.11.12
  • Accepted : 2009.01.31
  • Published : 2009.05.25
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Abstract

As a substitute for CCA, which is inhibited due to its environmental pollution and human harmfulness, and CuAz and ACQ with a high cost, okara-based wood preservatives were formulated with okara hydrolyzates using copper sulfate and/or borax as a metal salt. The efficacy of the preservatives and X-ray microanalysis of wood specimens treated with the preservatives were examined to confirm the potential of the okara-based wood preservatives. Most of the preservatives showed excellent decay resistance against brown-rot fungi, Postia placenta and Gloeophyllum trabeum. The efficacy was improved when the acid concentration and temperature used for the hydrolysis of okara increased. In addition, when borax was added into copper sulfate/okara hydrolyzates preservative formulations, any decay was not found in the specimens. From the microscopic observation of the specimens treated with okara-based wood preservatives, it seems that okara is contributed to the fixing of metal salts in wood blocks. Therefore, it is speculated that okara-based wood preservatives can effectively protect wood against fungal attack as CuAz, and that the preservatives are sufficient to use as an alternative wood preservative of CCA, ACQ and CuAz.

최근 환경오염 및 인체 유해성으로 사용이 제한 받고 있는 목재방부제인 chromated copper arsenate (CCA) 그리고 CCA의 대체방부제로 사용되고 있는 고가의 Copper Azole (CuAz)과 alkaline Copper quaternary (ACQ)를 대체하기 위하여 유기폐기물인 두부비지, $CuSO_4$ 그리고/또는 Borax를 이용하여 조제하였다. 이렇게 조제된 두부비지 목재방부제의 사용 가능성을 확인하기 위하여 갈색부후균에 대한 방부효능을 조사하고, 그 방부제가 처리된 목재시편을 FE-SEM과 EDS를 이용하여 현미경적 분석을 수행하였다. 두부비지 방부제로 처리한 목재시편은 Postia placenta와 Gloeophyllum trabeum에 대해 우수한 방부효능을 보였으며, 비지의 가수분해를 위해 사용된 산농도 및 온도의 증가, 그리고 Borax의 첨가는 방부효능을 향상시켰다. 두부비지 방부제로 처리된 시편의 현미경적 관찰을 통하여 비지 가수분해물과 구리의 반응을 통해 용탈과정 중에 용출에 대한 내성을 향상시킨다는 것을 확인할 수 있었다. 상기 결과를 토대로 두부비지 방부제가 경제성과 환경적 측면에서 목재방부제로 사용될 수 있다고 생각한다.

Keywords

Acknowledgement

Supported by : 농림부

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