Preparation and mechanical characterization of particleboard made from maritime pine and glued with bio-adhesives based on cornstarch and tannins

Resumen

In this presented work, we describe the development and characterization of a new,environmentally friendly adhesive derived from cornstarch and tannins. The production of woodcomposites mainly relies on the petrochemical-based and formaldehyde-based adhesives such as ureaformaldehyde (UF), phenol formaldehyde (PF) and melamine urea formaldehyde (MUF), which cangenerate under certain conditions, problems for health and environment. The aim of our work is toreplace totally these synthetic resins. In order to evaluate the quality of cornstarch-tannin adhesives,particleboards were produced and physical and mechanical properties were investigated. Thesephysical properties included rheological, thermogravimetric analysis and solid phase 13C NMR analysisof resins. Internal bond, surface soundness, modules of rupture and modulus of elasticity mechanicalproperties of particleboards bonded with cornstarch-tannin adhesives were also determined.Particleboards bonded with formaldehyde-free cornstarch-tannin adhesive showedcomparable mechanical properties to the panels made with the commercial UF resins and satisfiedthe exigencies of panels for interior fittings used in dry medium (P2) according to European normsEN 312 (2004). Beyond 4 hours, rheological characterization show excellent structural stability ofcornstarch-tannin adhesive.