This study was carried out to measure formaldehyde emission with the passing of two years from plywood, sliver-board and strand-board bonded with urea resins which were made of 6 F / U molar ratios. The urea resins were manufactured by six kinds of formaldehyde/urea molar ratio of 1.0, 1.2, 1.4, 1.6, 1.8 and 2.0. 1. The plywood with molar ratio of 1.0 satisfied the KS F3101 F₂ directly after manufacture. The plywood with molar ratio of 1.2 satisfied in 3 days. The plywood with molar ratio of 1.4 satisfied the F₃ in 3 days and the F₂ in 600 days. And the plywood with molar ratio of 1.8 and 2.0 satisfied the F₃ in 365 days, but didn t satisfy the F₂ in 730 days. 2. Sliver-board with molar ratio of 1.0 and 1.2 satisfied the KS F3104 E₂ right after manufacture. Sliver-board with molar ratio of 1.4 and 1.6 satisfied in 150 and 360 days, respectively. Sliverwith molar ratio of 1.8 and 2.0 satisfied in 730 days. 3. Strand-board with molar ratio of 1.0 and 1.2 satisfied the KS F3104 E₂ directly after manufacture. Strand-board with molar ratio of 1.4 and 1.6 satisfied in 150 days. But Strandwith molar ratio of 1.8 and 2.0 didn t satisfy in 730 days.
1.서론
2.재료 및 방법
3.결과 및 고찰
4.결론
참고문헌