Paineis híbridos de lâminas e partículas de madeira para uso estrutural

Abstract

Resumo uso de painéis de madeira tem ganhado destaque na indústria da construção civil. Os painéis MDP não atingem requisitos estruturais, ao contrário dos painéis OSB e compensado. Uma alternativa a fim de aprimorar o uso de painéis de partículas de madeira consiste no reforço desses com lâminas de madeira (painéis híbridos). Esta pesquisa objetivou avaliar o potencial de uso de painéis híbridos fabricados com partículas e lâminas de madeira de Pinus sp. e com resina poliuretana bicomponente à base de óleo de mamona, obedecendo à norma ABNT NBR 14810-2. Os resultados das propriedades físicas e mecânicas foram comparados com os requisitos normativos para painéis OSB (EN 300) e compensados (DIN 68792), e também com os resultados de painéis comerciais OSB e compensado. Os painéis híbridos atenderam os requisitos normativos para painéis comerciais OSB e compensado, indicados para uso estrutural. A análise estatística indicou a superioridade das propriedades físicas e mecânica dos painéis híbridos quando comparados com os resultados dos painéis OSB e compensado comerciais, resultado esse também justificado pelo uso da resina à base de mamona.Palavras-chave: Painel de madeira compensada. Painel OSB. Painel MDP. Resina poliuretana à base de óleo de mamona. AbstractThe use of wood panels has been gaining prominence in the construction industry. MDP panels do not meet structural requirements, unlike OSB and plywood panels. An alternative solution to improve the use of wood particleboard is the reinforcement of wood particleboards (hybrid panels). This research study aimed to evaluate the potential of using hybrid panels made with wood particles and veneers of Pinus sp. and with castor-based bicomponent polyurethane resin, meeting the Brazilian Standard ABNT NBR 14810-2. The physical and mechanical properties results were compared with the normative requirements for OSB (EN 300) and plywood panels (DIN 68792), as well as with the results of commercial plywood OSB panels. Hybrid panels met the standard requirements for OSB and plywood commercial panels indicated for structural use. The statistical analysis indicated the superiority of the physical and mechanical properties of the hybrid panels when compared to the results of the OSB and commercial plywood panels, a result that is also due to the use of the castor resin.

Production of mahogany particleboards using branches and wood residues

“…Given the background of over-exploitation and waste generation and considering that recently a company got a FSC certificate to legally extract mahogany from Pará (FOREST…, 2016), this study comes as a way to enlighten the reader to the possibility of using mahogany sawmill residues in addition to the branches from pruning and limbing processes to produce high quality particleboards that could be used by furniture industry or in building construction, therefore minimizing environmental impact of the extraction chain and adding more value to mahogany's commercial cycle. Also, it is important to highlight that, the use of an alternative resin such as castor oil polyurethane resin meet the cleaner requirement when compared to urea-formaldehyde and phenol-formaldehyde adhesives, using less energy on productive process and not release formalin gas along manufacture, toxic gas for human being (SILVA et al, 2014;FERRO et al, 2018;MACEDO et al, 2019;YANO et al, 2020).…”

Castor oil based polyurethane adhesive content on OSSB produced with soybean straw

“…Polyurethane is another type of formaldehyde-free adhesive (polyurethane based) that has a wide range of applications in industry (TANG et al, 2008). This binder has been substantially investigated as a replacement of conventional adhesives in wood-based and other lignocellulosic composites (MERLINI;SOLDI;BARRA, 2011;FIORELLI et al, 2012FIORELLI et al, , 2013BERTOLINI et al, 2013;VALARELLI et al, 2014;CHEN;TAI, 2018;NASCIMENTO et al, 2018;VARANDA et al, 2018;FERRO et al, 2019;MACEDO et al, 2019;SHIROSAKI et al, 2019). The use of castor oil polyurethane adhesive in the composition SbS OSSB in this paper is justified due the abundance of the Ricinus communis L. plant in Brazil, whose seeds are used for the production of the resin (CANGEMI et al, 2006).…”

Influência dos parâmetros de fabricação nas Propriedades Físicas e Mecânicas de Paineis de Partícula de Média Densidade

“…Estes painéis são constituídos de madeira processada (partículas, lascas ou lamelas) e resina, unidas à quente sob pressão [8][9][10]. As resinas utilizadas no processo de fabricação podem ser acetato de polivinila (PVA), fenol formaldeído (FF), resorcinol formaldeído (RF), ureia formaldeído (UF), difenilmetano diisocianato (MDI) e poliuretana (PU) à base de óleos de origem vegetal [3, [11][12][13][14][15][16], destacando-se a resina ureia formaldeído, utilizada na fabricação de paineis comerciais [12,[17][18][19].…”

“…Dentre os paineis engenheirados à base de madeira, destaca-se o uso de painéis MDP (Medium Density Particleboard), utilizados na indústria para confecção de móveis [20][21][22][23] e, quando associados com outros produtos engenheirados, como lamelas e lascas de madeira, podem ser utilizados para fins estruturais [17,24].…”