Abstract
Hinoki cypress (Chamaecyparis obtusa) wood meal was liquefied at 150℃ using poly(oxyethylene) glycol as a liquefaction solvent in the presence of a sulfuric acid catalyst. Liquefied wood (LW) were characterized by residue content, hydroxyl number, moisture content, viscosity, molecular weight, molecular weight distribution, and FT-IR. About 85% of wood meal was converted to soluble components at the reaction time of 30min. Hydroxyl number and weight average molecular weight of LW was decreased with increasing liquefaction reaction. Wood boards were prepared from recycle chips with polyurethane resin adhesives based on LW, polymeric MDI and 1,4-butane diol. The flexural strength of wood boards was decreased with liquefaction reaction time of LW, however the strength was over that of JIS A5908.
