Estudo do adesivo poliuretano à base de mamona em madeira laminada colada (MLC)

The aim of this work is the study of the polyurethane adhesive based on castor oil in glued laminated timber structures (GLULAM). The efficiency of the adhesive was evaluated using the following mechanical tests: shear, perpendicular and parallel tension to the grain strengths. The Brazilian Code NBR 7190/97 “Design of the timber structures” was used to the tests and based on these results were determined the gluing parameters as: viscosity (V), gluing pressure (P), time of pressure (Tp) and the curing time (Tc) and evaluated the influence of these variables and interactions on the mechanical strengths. Two wood species Pinus caribea hondurensis and Eucaliptus grandis were chosen because they are used as reforestation in South and Southeast areas in Brazil where are located the glulam industries. The adhesive studied is of the two components, that is, the poliol B1640 and the prepolymer A249 and is made of a natural and renewable resource, cure in the environment conditions, not aggressive to man and the environment, and a national technology. The results showed a good performance of this adhesive, a good technical alternative for the technology utilization of GLULAM in timber structures with reforestation species.