Análise experimental da influência do preaquecimento do adesivo sintético na resistência mecânica de painéis de madeira de pinus

Abstract

The objective of this work was to verify the performance of glued joints as a function of the preheating temperature of a synthetic adhesive based on Polyvinyl Acetate (PVAc) for different initial temperatures with wood of the Pinus Taeda species. For the tests, samples were made according to the ABNT Standard - NBR 7190:1997, subject to tests of resistance to rupture in the glue line by shear and traction efforts. 30 and 36 sets of specimens were made for tension and shear respectively, of which 10 and 12 specimens were used for each of the three temperatures T1= 20°C, T2= 25°C and T3= 30°C. For the mechanical test, the samples were bonded with PVA-based adhesive from the Mastercool brand, hot-pressed in a high-frequency press, from the Maquimóvel brand. The samples indifferent to the temperature that were glued showed a proportionality relationship between resistance and density, that is, greater density, greater resistance. The samples glued with a temperature of 20°C, obtained an average resistance of 2.2 MPa and 7.01 MPa, the samples glued with a temperature of 25°C, obtained an average resistance of 1.5 MPa and 7.26 MPa and the samples glued with a temperature of 30°C, obtained an average resistance of 1.8 MPa and 6.26 MPa, for traction and shear respectively. Density has shown to influence resistance, in the future there is a need to study the relationship between resistance and density. [resumo fornecido pelo autor]