Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

Abstract

Tests simulating exposure to severe weather conditions have been relevant in seeking new applications for particleboard. This study aimed to produce particleboards with residues of CCB (chromium-copper-boron oxides) impregnated Pinus sp. and castor oil-based polyurethane resin, and to evaluate their performance before and after artificial accelerated aging. Panels were produced with different particle mass, resin content and pressing time, resulting eight treatments. Particles moisture and size distribution were determined, beyond panel physical and mechanical properties, according to NBR14810-3: 2006. After characterization, treatments B and G (small adhesive consumption and better mechanical performance, respectively) were chosen to artificial aging tests. Statistical results analysis showed best performances were achieved for waterproof aged samples, of both B and G treatments. As example, in treatment B, MOR and MOE values were 23 MPa and 2,297 MPa, samples before exposure; 26 MPa and 3,185 MPa, 32 MPa and 3,982 MPa for samples after exposure (non-sealed and sealed), respectively.

<b>Evaluation of modulus of elasticity in static bending of particleboards manufactured with <i>Eucalyptus grandis</i> wood and oat hulls

“…The MOE average value obtained in this study is similar that of other studies, e.g., Fiorelli et al (2012b), who obtained average MOE values ranging from 1400 to 2040 MPa, with high density particleboards manufactured with coconut fiber and castor oil-based polyurethane resin (PU). Bertolini et al (2013) obtained average MOE values ranging from 2300 to 2900 MPa, with high density particleboards manufactured with Pinus sp. particles treated with CCB and PU resin.…”

“…The press cycle parameters were: 4MPa press pressure, 10 min. press time, and 100 o C press temperature, as in other studies also carried out at the Laboratory of Wood and Structural Timber (BERTOLINI et al, 2013;. Figure 2 shows the panels being manufactured.…”

Avaliação das propriedades química, física e mecânica de painéis aglomerados produzidos com resíduo de madeira da Amazônia - Cumaru (Dipteryx Odorata) e resina poliuretana à base de óleo de mamona

“…Nesse contexto, o presente estudo tem como objetivo produzir painéis utilizando resíduos de madeira nobre da Amazônia, com resina poliuretana (PU) em parte renovável, derivada do óleo da mamona (ricinus communis) que tem sido estudada há vários anos [6] e que tem mostrado grande potencial na produção de compósitos lignocelulósicos [7][8][9] .…”

Propriedades físicas de painéis aglomerados de madeira produzidos com adição de película de polipropileno biorientado

“…Esses resíduos são compostos principalmente da serragem produzida pela serra utilizada durante o desdobro da madeira e por partes da árvore que não apresentam interesse econômico no mercado de madeiras serradas mas que têm larga aplicação na indústria de painéis de madeira aglomerada (Nascimento & Rocco Lahr, 2007;Bertolini et al, 2013).…”