Physical and Mechanical Properties and Fire-endurance Characteristics of Recycled Particleboards
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In this study, fire-retardant chemicals were melt with mixed composition ratios of dibasic ammonium phosphate and each half of boric acid and borax in hot water, in which hammer-milled chips were immersed to increase swelling of waste particleboards. Also, fire-retardant treated particles from sawn lumber chip and recycled particleboard chip were composed in ratio of 70:30 in core layer to improve boards' properties. Retention ratio of fire-retardant chemicals for the particles for face layer was high due to high specific surface area, and that of sawn lumber chips was somewhat higher than that of recycled particleboard chips. The mixture of particles from sawn lumber chips and recycled PB of 70:30 in weight ratio exceeded bending strength of 100 kgf/cm2. It seemed that the relatively greater portions of dibasic ammonium phosphate affected adversely to dimensional stability, however fire-retardants treatment resulted in distinct effect lowering formaldehyde emission such as E0 type (0.5mg/ℓ or less) in KS F 3104. In fire-retardancy, the recycled boards with a mixed ratio of dibasic ammonium phosphate to boric acid•borax (50:50 mixture) of 70% to 30% in weight satisfied fire-retardancy 3rd grade in KS F 2271, and also this composition from cone calorimeter test met same standard grade figuring total heat release of 4.6MJ/m2.
Abstract
In this study, fire-retardant chemicals were melt with mixed composition ratios of dibasic ammonium phosphate and each half of boric acid and borax in hot water, in which hammer-milled chips were immersed to increase swelling of waste particleboards. Also, fire-retardant treated particles from sawn lumber chip and recycled particleboard chip were composed in ratio of 70:30 in core layer to improve boards' properties. Retention ratio of fire-retardant chemicals for the particles for face layer was high due to high specific surface area, and that of sawn lumber chips was somewhat higher than that of recycled particleboard chips. The mixture of particles from sawn lumber chips and recycled PB of 70:30 in weight ratio exceeded bending strength of 100 kgf/cm2. It seemed that the relatively greater portions of dibasic ammonium phosphate affected adversely to dimensional stability, however fire-retardants treatment resulted in distinct effect lowering formaldehyde emission such as E0 type (0.5mg/ℓ or less) in KS F 3104. In fire-retardancy, the recycled boards with a mixed ratio of dibasic ammonium phosphate to boric acid•borax (50:50 mixture) of 70% to 30% in weight satisfied fire-retardancy 3rd grade in KS F 2271, and also this composition from cone calorimeter test met same standard grade figuring total heat release of 4.6MJ/m2.
참고문헌 (7)
- Hirata,T, "Mokuzai nan-enka no mechanism (Mechanism of fire-retardancy) ((Japan).", Wood Industry, 44(5), pp.2~7 (1989)
- Kim, J. M, "A Comparative study on the mechanical properties of plywood treated with several fire retardant chemicals (I) - Effect of soaking time on the static bending strength of treated plywood", Mokchae Konghak, 12(2), pp.20~26 (1984)
- Kwon, J. H, "Effects of fire retardant treatment on mechanical properties and fire retardancy of particleboard and complyboard", Mokchae Konghak, 13(4), pp.3~57 (1985)
- Lee, P. W, "Redrying fire-retardant-treated structural plywood", Mokchae Konghak, 9(4), pp.1~21 (1981)
- Levan, S. L, "Effects of fire retardant treatments on wood strength: A review", Wood Fiber Sci, 22(1), pp.113~131 (1990)
- Levan, S. L, "Effects of fire retardant chemicals on the bending properties of wood at elevated temperatures(Research Paper FPL-RP-498)", pp.24~ (1990), USDA, Forest Service, FPL
- White, R. H, "Wood Products: Thermal degradation and fire (ISBN: 0-08-0431526)", pp.9712~9716 (2001), Encyclopedia of Materials: Science and Technology