Painéis MDP produzidos com bagaço de cana tratado termicamente

Abstract

The aim of this study was to evaluate the effect of different levels of temperature of thermal treatment on the particleboard properties made from sugarcane bagasse. The experiment consisted of four treatments, being evaluated three temperatures of thermal treatment of sugarcane bagasse (170, 200 and 230°C) and one treatment without thermal modification (Control). The particles were evaluated for their anatomical, chemical and physical characteristics. The particleboards were produced with nominal density of 0.70g/cm³, face/core relation of 40:60, 11% of urea-formaldehyde adhesive to the faces and 7% of adhesive to the core, pressing cycle of 160°C temperature, pressure of 3.94MPa and for a period of eight minutes. The particleboards were evaluated for their properties of physical density, compression ratio, moisture, water absorption and thickness swelling after two and twenty-four hours of immersion; their mechanical properties of internal bond, rupture modulus and modulus of elasticity at static flexion and its thermal insulation property. The thermal treatment of the sugarcane bagasse particles at the temperature of 230°C promoted significant improvements in the quality of the particleboards, resulting in the decrease of the water absorption and thickness swelling values of the panels and the increase in modulus of elasticity values, and meeting marketing standards regarding the thickness swelling after twenty-four hours of immersion in water. This fact demonstrates the great potential of using the thermal treatment at the temperature of 230°C for the production of particleboard with sugarcane bagasse.