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Valorisation des panneaux de particules à partir de déchets agricoles, de tanins d'acacia nilotica et d'adhésifs synthétiques

Abstract : The ground bark of subspecies of Acacaia nilotica, nilotica (Ann), tomentosa (Ant) adansonii, (Ana) and its pods (Pana) were extracted with hot water (90-95° C) for extraction period of 24 hours, then the extracts were spray dried at 65°C, using a laboratoty spray dryer. The structural characteristics of the tannins derived from the four subspecies of Acacia nilotica were determined on their concentrated solutions by using different techniques such as C13 NMR analysis, measuring their gel times, Chemwindows and MALDI-TOF. The search for cheaper synthetic adhesives with high performance led to acceleration of the hardening of low condensation phenol formadehyde, PF resins (whichis known by having a long pressing time by addition of accelerators such as tannins, PMDI and urea. Evaluation of the low quality fibers (eucalyptus species) agricultural wastes (bagasse) and the bast plants (hemp) as sources of particles for panels manufacture has been studied. The hemp showed a great potentiality for production of panels suitable for furniture and joinery applications according to European standard European standard EN312 - 3, with most of the adhesive formulations used. However, the eucalyptus and the bagasse both fibers performed well with the tannins / paraformaldehyde glue mix. PUF alone and PMDI alone produced panels sometimes exceeding the specifications of European standard for panels for interior uses.
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Zeinab Osman Hassan. Valorisation des panneaux de particules à partir de déchets agricoles, de tanins d'acacia nilotica et d'adhésifs synthétiques. Autre. Université Henri Poincaré - Nancy 1, 2003. Français. ⟨NNT : 2003NAN10007⟩. ⟨tel-01746751⟩

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