PROPERTIES OF CROSS-LAMINATED TIMBER BONDED WITH AN ADHESIVE BASED ON TANNINS FROM THE BARK OF Mimosa tenuiflora TREES

ABSTRACT This study aimed to determine the concentration of condensed tannins in bark Mimosa tenuiflora (Willd) Poir trees. Additionally, physical-mechanical properties cross-laminated timber (CLT) panels bonded with an adhesive based on M. were assessed. Bark was collected from five The formulation synthesized by mixing powdered tannins, paraformaldehyde, and water at 50 °C under continuous stirring. extract its pristine state without any previous chemical treatment or modification employed synthesize adhesive. Viscosity, pH, solids content, gel time determined. CLT manufactured Eucalyptus spp. wood. bonding performance assessed determining physical (apparent density absorption) mechanical (modulus elasticity – MOE, modulus rupture MOR, shear strength) panels. Condensed content 23.4%. Adhesive pH = 3.93, TS 50.64%, 460 s, 6,000 cP for viscosity. Values MOR strength 4,411, 16.18, 1.06 MPa, respectively. are promising adhesives bond CLT.