Abstract
This study presents the investigation of the effects of oxidant type (nitric acid and potassium dichromate), oxidant content (three different levels as 2, 4, and 6 percent) and ureaformaldehyde (UF) resin percentage (two levels as 5 and 7 percent) on mechanical and physical properties of interior grade medium density fiberboard made from bagasse fibers. Some panel properties were studied, such as modulus of rupture (MOR) and modulus of elasticity (MOE) in bending, compression-shear strength (C.S sth.), water absorption (WA) and thickness swelling (TS) after 2and 24-hour immersion in cold water. In addition, the results indicated the best values for WA and TS after 2and 24-hour immersion, and C.S. sth. was discerned at 7 percent UF resin content, together with 6 percent nitric acid. Furthermore, the greatest values for MOR and MOE were related to 7 percent UF resin content together with 4 percent nitric acid.
Highlights
This study presents the investigation of the effects of oxidant type, oxidant content and urea- formaldehyde (UF) resin percentage on mechanical and physical properties of interior grade medium density fiberboard made from bagasse fibers
The analyses showed that nitric acid was superior to potassium dichromate
Mechanical and physical properties of chemically treated bagasse medium density fiberboard (MDF) boards were strongly depended on resin percentage
Summary
Faced with an increasing worldwide wood fiber shortage, environmental considerations, and in order to meet the future demand, the use of non-wood lignocellulosic fiber resources has been increased, and wood composites industry is showing a renewed interest in the production of panel products from agricultural residues (Chow, 1975; Odozi et al, 1986; Sampatharajan et al, 1992). In Iran, similar to many developing Asian countries, deforestation and over harvesting have raised environmental awareness, which focused on the studies for using non-wood renewable resources in composite panel production. Non-wood based resources are getting more important as a raw material in the manufacture of composite panels. For countries like Iran, agricultural residues show excellent potential in composite manufacturing industries. Bagasse is abundant, unused, and can be obtained at a very low cost. Its lignin content is low and its open structure will facilitate liquid penetration (Zare-Hosseinabadi et al, 2008)
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