Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Preparation of EVA/Intumescent/Nano-Clay Composite with Flame Retardant Properties and Cross Laminated Timber (CLT) Application Technology

난연특성을 가지는 EVA/Intumescent/나노클레이 복합재료 제조 및 교호집성재(Cross Laminated Timber) 적용 기술

  • Choi, Yo-Seok (KB Adhesives Co., Ltd) ;
  • Park, Ji-Won (Lab of adhesion & bio-composites, Program in Environmental Materials Science, Department of Forest Sciences, College of Agricultural and Life Sciences, Seoul National University) ;
  • Lee, Jung-Hun (Lab of adhesion & bio-composites, Program in Environmental Materials Science, Department of Forest Sciences, College of Agricultural and Life Sciences, Seoul National University) ;
  • Shin, Jae-Ho (Lab of adhesion & bio-composites, Program in Environmental Materials Science, Department of Forest Sciences, College of Agricultural and Life Sciences, Seoul National University) ;
  • Jang, Seong-Wook (Lab of adhesion & bio-composites, Program in Environmental Materials Science, Department of Forest Sciences, College of Agricultural and Life Sciences, Seoul National University) ;
  • Kim, Hyun-Joong (Lab of adhesion & bio-composites, Program in Environmental Materials Science, Department of Forest Sciences, College of Agricultural and Life Sciences, Seoul National University)
  • 최요석 ((주)케이비어드히시브스.) ;
  • 박지원 (서울대학교 농업생명과학대학 산림과학부 환경재료과학전공, 접착과학 및 바이오복합재료 연구실) ;
  • 이정훈 (서울대학교 농업생명과학대학 산림과학부 환경재료과학전공, 접착과학 및 바이오복합재료 연구실) ;
  • 신재호 (서울대학교 농업생명과학대학 산림과학부 환경재료과학전공, 접착과학 및 바이오복합재료 연구실) ;
  • 장성욱 (서울대학교 농업생명과학대학 산림과학부 환경재료과학전공, 접착과학 및 바이오복합재료 연구실) ;
  • 김현중 (서울대학교 농업생명과학대학 산림과학부 환경재료과학전공, 접착과학 및 바이오복합재료 연구실)
  • Received : 2017.11.17
  • Accepted : 2018.01.05
  • Published : 2018.01.25
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Abstract

Recently, the importance of flame retardation treatment technology has been emphasized due to the increase in urban fire accidents and fire damage incidents caused by building exterior materials. Particularly, in the utilization of wood-based building materials, the flame retarding treatment technology is more importantly evaluated. An Intumescent system is one of the non-halogen flame retardant treatment technologies and is a system that realizes flame retardancy through foaming and carbonization layer formation. To apply the Intumescent system, composite material was prepared by using Ethylene vinyl acetate (EVA) as a matrix. To enhance the flame retardant properties of the Intumescent system, a nano-clay was applied together. Composite materials with Intumescent system and nano - clay technology were processed into sheet - like test specimens, and then a new structure of cross laminated timber with improved flame retardant properties was fabricated. In the evaluation of combustion characteristics of composite materials using Intumescent system, it was confirmed that the maximum heat emission was reduced efficiently. Depending on the structure attached to the surface, the CLT had two stages of combustion. Also, it was confirmed that the maximum calorific value decreased significantly during the deep burning process. These characteristics are expected to have a delayed combustion diffusion effect in the combustion process of CLT. In order to improve the performance, the flame retardation treatment technique for the surface veneer and the optimization technique of the application of the composite material are required. It is expected that it will be possible to develop a CLT structure with improved fire characteristics.

최근 들어 늘어나고 있는 도시형 화재 사고와 건축 외장재에 따른 화재 피해 사례의 증가에 따라 난연처리기술의 중요성이 부각되고 있다. 특히, 목재를 기반으로 한 건축재료의 활용에 있어서 난연처리기술은 더욱 중요하게 평가되고 있다. Intumescent 시스템은 비할로겐계 난연처리기술의 하나로, 발포와 탄화층 형성을 통하여 난연성을 구현하는 시스템이다. 본 연구에서는 Intumescent 시스템을 적용하기 위해 Ethylene vinyl acetate (EVA)를 매트릭스로 채용하여 복합재료를 제조하였다. Intumescent 시스템의 난연특성을 강화하기 위해 나노클레이를 함께 적용하였다. Intumescent 시스템과 나노클레이 기술을 함께 적용한 복합재료를 시트상의 시험편으로 가공한 후, 이를 활용하여 표면의 난연특성이 강화된 새로운 구조의 교호집성재를 제작하였다. Intumescent 시스템을 적용한 복합재료의 연소특성 평가에서 최대 열방출량이 효과적으로 감소되는 것을 확인할 수 있었다. 표면에 부착된 구조에 따라 CLT는 두 단계에 걸친 연소 현상이 발생했다. 또한, 심부 연소 과정에서 최대 열방출률이 크게 감소하는 경향을 확인할 수 있었다. 이러한 특성은 목재의 연소과정에 있어 연소 확산지연효과가 있을 것으로 판단된다. 표면단판에 대한 난연처리기술 및 복합재료 적용 최적화 기술을 통해 보다 화재특성이 개선된 CLT 구조체 개발이 가능할 것으로 기대된다.

Keywords

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