Effect of the Kind and Content of Raw Materials on Mechanical Performances of Hybrid Composite Boards Composed of Green Tea, Charcoals and Wood Fiber

In this study, eco-friendly hybrid composite boards were manufactured from green tea, three kinds of charcoals and wood fiber for developing interior materials to reinforce the strength performances and the functionalities in addition to performances of the green tea-wood fiber hybrid boards. The effects for the kind and the component ratio of raw materials on mechanical properties were investigated. Bending strength performances of hybrid composite boards were highest in the hybrid composite boards composed of green tea, fine charcoal and wood fiber on average. However, the difference caused by the kind of charcoals was not large. These values were was markedly improved than those of green tea - wood fiber hybrid composite boards reported in previous researches. And it was found that the bending strength performance decreased with increasing component ratios of green tea and charcoals. The difference between urea resins used as the binder showed the higher value in hybrid composite boards using $E_1$ grade urea resin than in those using $E_0$ grade urea resin, but the difference between hybrid composite boards manufactured by both resins decreased markedly than the green tea - wood fiber hybrid composite boards reported in previous research. The internal bond strength of hybrid composite boards was in the order of hybrid composite boards with fine charcoal, activated charcoal and black charcoal, and it was found that the hybrid composite boards with fine charcoal had a similar values to control boards composed of only wood fiber.

녹차-숯-목재섬유 복합보드의 역학적 성능에 미치는 구성원료의 종류 및 배합비율의 영향

이 연구에서는 녹차-목재섬유 복합보드의 강도성능과 기능성을 보강한 건축내장재를 개발하기 위하여, 목재섬유에 녹차와 흑탄, 백탄, 활성탄 등 3종류의 숯을 혼합한 녹차-숯-목재섬유 복합보드를 제작하였고, 구성원료의 종류 및 그 배합비율이 복합보드의 정역학적 성능에 미치는 영향을 조사하였다. 녹차-숯-목재섬유 복합보드의 휨 강도성능은 백탄함유 복합보드에서 평균적으로 가장 높은 값을 나타내었으나, 숯의 종류에 따른 휨 강도성능의 차이는 크지 않았다. 그러나 그 값은 선행연구의 녹차-목재섬유 복합보드보다 현저한 휨 강도성능의 향상을 나타내었고, 녹차와 숯의 배합비율이 증가할수록 휨 강도성능의 감소가 확인되었다. 바인더로 사용된 요소수지의 종류에 따른 차이는 $E_1$급 요소수지를 사용한 복합보드가 $E_0$급 요소수지를 사용한 그것보다 높은 휨 강도성능을 나타냈지만, 양 수지간의 차이는 선행연구의 녹차-목재섬유 복합보드에 비해 현저히 감소하였다. 복합보드의 박리강도는 백탄 $$\geq_-$$ 활성탄 > 흑탄함유 복합보드의 순이었고, 백탄함유 복합보드에서는 목재섬유로만 구성된 대조보드와 거의 비슷한 값을 나타내는 것이 확인되었다.