Caracterização de painéis de partículas de média densidade feitos com resina poliuretana monocomponente à base de mamona

Almeida

et al. 2020

BioRes

Use of lignocellulosic materials in particleboard has turned into an alternative for the reuse of such materials, which are abundant and may have precarious disposal techniques. The present study fabricated particleboards using industrial sawmill waste from tropical hardwoods (a mix of species) and sugarcane bagasse with castor oil-based bicomponent polyurethane resin and evaluated the influence of the incorporation of sugarcane bagasse (0, 10, 20, 30, 40, and 50%) on the physical and mechanical properties of the composites. The particleboards were produced according to the Brazilian Standard ABNT NBR 14810 (2018), and performance requirements were assessed using Brazilian and international standards. Some of the particleboards met standardized requirements, with Treatment 5 (50% sawdust and 50% bagasse) showing better performance, indicating the possibility for use indoors in dry conditions. The addition of sugarcane bagasse increased dimensional stability of particleboards when compared with panels manufactured with timber residue. Statistical analysis indicated the percentage of bagasse was significant, increasing physical and mechanical properties when compared with the reference treatment.

Section: Methodssupporting

confidence: 84%

Use of sugarcane bagasse and industrial timber residue in particleboard production

Yano

Almeida

et al. 2020

BioRes

“…OSSB was produced in laboratory scale according to the method described by Bach, Domier and Holowach (1999) and Shirosaki et al (2019). SbS was manually split along its main axis to expose its inner regions, and then was dried in a laboratory oven at 103 ºC for 24 h before the production of the boards.…”

Section: Ossb Production Processmentioning

confidence: 99%

“…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).…”

Section: Introductionmentioning

confidence: 99%

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

Fiorelli

et al. 2021

Ambient. constr.

Self Cite

Oriented Structural Straw Board (OSSB) panels are composites made from straw originally from agricultural residues and non-formaldehyde based adhesive, whose main application is for construction as a closing and ceiling material. The objective of this study was to evaluate the effect of the polyurethane adhesive content on physical and mechanical properties of OSSB produced with locally available SbS (soybean straw). Four castor oil based polyurethane ratios (6%, 9%, 12% and 15%, by mass of the SbS) were tested. OSSB was evaluated according to European standards for wood-based composites; also, a physical and chemical characterization of the SbS was performed. SbS has an irregular shape, which reduced the OSSB mechanical performance due to the low densification of the composite and the development of transversal cracks on the SbS after the OSSB manufacturing process. The static bending and thickness swelling performance of SbS OSSB was not improved by the increase of polyurethane adhesive content. SbS low ash content and neutral pH extractives indicates that probably its chemical properties should not affect the setting of the adhesive.

“…As madeiras utilizadas para confecção de painéis para uso comercial são as espécies do gênero Pinus spp.e Eucalyptus spp., as quais são espécies de produção em larga escala e ditas "madeiras de reflorestamento" [25,26]. Dentre estas, destaca-se a espécie Eucalyptus saligna, espécie de reflorestamento, com possibilidade de uso em fins estruturais, classificada na classe C30 das espécies folhosas, possibilitando seu uso em painéis de madeira [27][28][29][30][31].…”

Section: Introductionunclassified

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

Aquino

Lahr³

et al. 2020

Matéria (Rio J.)

Self Cite

RESUMO A presente pesquisa tem por objetivo avaliar a influência de três fatores de produção (densidade nominal, temperatura e pressão) na produção de paineis de partículas de média densidade da madeira de Eucalyptus saligna com resina ureia-formaldeído e catalisadores e verificar se os paineis atendem ao requisito normativo da ABNT NBR 14810. A influência dos fatores nos paineis MDP foram analisados por intermédio de 12 tratamentos experimentais. Foram fabricadas 48 chapas ao total, com 4 chapas com dimensões 300 mm x 300 mm x 15 mm, determinando 7 propriedades físicas e mecânicas, totalizando 336 determinações experimentais. Foram avaliadas as seguintes propriedades: teor de umidade, densidade aparente, inchamento em espessura após 2h e 24h, tração perpendicular, módulo de elasticidade e módulo de resistência. Os tratamentos, em grande parte, atenderam aos requisitos normativos, com três tratamentos atendendo plenamente. Para a maioria das propriedades os fatores de produção não foram significativos do ponto de vista estatístico, possibilitando que possa haver redução de algum fator a fim de manter o mesmo desempenho atendendo aos requisitos normativos.