Effect of the Sequence of Wax Addition, Wax Level and Type on Properties of Isocyanate-Bonded Particleboard

왁스첨가(添加) 순서(順序), 첨가량(添加量), 종류(種類)가 Isocyanate 접착(接着) PB의 성질(性質)에 미치는 영향(影響)

Research was conducted at the Wood Materials and Engineering Laboratory, Washington State University, Pullman, WA to evaluate the effects of the sequence of wax addition, wax level, and wax type on mechanical properties and water resistance performance of isocyanate-bonded particleboard. Mechanical properties and water resistance performance were not influenced significantly by the sequence of wax addition. Internal bond and wet modulus of rupture in bending strength were decreased significantly by increasing the wax emulsion level, but dry modulus of rupture and modulus of elasticity in bending strength were not decreased significantly by increasing the wax emulsion level. Dry internal bond, dry and wet moduli of rupture, and modulus of elasticity were not decreased by increasing the solid wax level except for wet internal bond. The addition of 1.0 and 1.5% wax level did not produce any significant additional water resistance effect when compared to the addition of 0.5% wax level. Internal bond values of boards with solid wax addition showed significantly better results than boards with just a wax emulsion added. Modulus of rupture, modulus of elasticity, and water resistance performance did not show significant difference between solid wax and wax emulsion.

본 연구는 왁스첨가순서(添加順序), 첨가량(添加量), 왁스종류(種類)가 Isocyanate 접착(接着) PB의 성질(性質)과 내수성(耐水性)에 미치는 영향(影響)을 구명(究明)하기 위해서 실시(實施)되었다. 왁스첨가순서(添加順序)는 PB의 기계적(機械的) 성질(性質) 및 내수성(耐水性)에 유의적(有意的)인 영향(影響)을 미치지는 않았다. 왁스에멀젼 첨가량(添加量)을 증가(增加)시킴으로써 접착력(接着力) 및 휨강도(强度) 내수(耐水) MOR은 감소(減少)되었지만 상태(常態) MOR 및 MOE는 감소(減少)되지 않았다. 상태접착력(常態接着力), 상태(常態) 및 내수(耐水) MOR과 MOE는 솔리드왁스량(量)을 증가(增加)시킴으로써 감소(減少)되지 않았지만 내수접착력(耐水接着力)은 감소(減少)되었다. 1% 및 1.5% 왁스량(量)을 첨가(添加)한 보드는 0.5% 왁스를 첨가(添加)한 보드와 비교(比較)해 보았을 때 내수성(耐水性)이 증가(增加)되지는 않았다. 솔리드왁스를 첨가(添加)한 보드의 접착력(接着力)은 왁스에멀젼을 첨가(添加)한 보드보다 더 좋은 결과(結果)를 나타내었다. 휨강도(强度)의 MOR 및 MOE, 내수성(耐水性)은 솔리드왁스와 왁스에멀젼간에 유의적(有意的)인 차이(差異)를 보이지는 않았다.