Characterisation of medium density particleboards made with monocomponent castor oil-based polyurethane resin

摘要

One of the main factors involved in the manufacture of panels is the adhesive type, in which the use of new adhesives can offer positive properties to the manufactured materials. This research study aimed to evaluate the physical and mechanical properties of particleboard made from Pinus sp. and Eucalyptus grandis wood adhered with monocomponent castor oil-based polyurethane resin, whose development has been systematically improved by several manufacturers. Ten particleboards were produced for each wood species evaluated, both manufactured using the same parameters and under the same experimental conditions: 640g of particles (approximately 10% moisture content), 15% adhesive content based on the particle mass, 10 min press time at 100oC under a pressure of 4.0 MPa, consisting of the same parameters used in the manufacture of particleboards adopted in other research studies, but produced with bicomponent castor oil-based polyurethane resin. The panels were characterized according to the assumptions and methods of calculation specified in the Brazilian standard NBR 14810-2 (2013), using also the international standards for the verification of the requirements. With the exception of the screw pulling strength, the other properties obtained exceeded the requirements of the normative standards used.