Influência do tempo de prensagem em propriedades físicas e mecânicas de painéis MDP

Chahud

et al. 2019

BioRes

Self Cite

The use of particleboards (PB) has increased quickly as an alternative engineered wood product mainly due to its having a better ratio of resistance to weight and more elimination of wood defects, such as the presence of knots. Although the panel industry has been constantly growing, innovations are still necessary to improve the final product. The use of metallic oxide nanoparticles on the wood-based panels has the potential to increase the heat transfer process and improve the physico-mechanical properties. The aim of this work was to evaluate the influence of the addition of zinc oxide (ZnO) nanoparticles in PB, correlating the physical and mechanical properties of the panel with the heat transfer process at 180 °C. The results were compared with the Brazilian standard ABNT NBR 14810-2 (2013) and the European standard EN 312 (2010), as well with works found in literature. The results showed a homogenous heat distribution during the pressing, which improved physical properties, decreasing the 24h swelling from 22.2% to 14.9% and the 24 h absorption from 30.29% to 21.0%. Besides that, MOR values was increased from 11.3 MPa to 14.5 MPa and the MOE from 1880 MPa to 2510 MPa.

Section: Heat Transfermentioning

confidence: 83%

Heat transfer and physical-mechanical properties analysis of particleboard produced with ZnO nanoparticles addition

Chahud

et al. 2019

BioRes

Self Cite

“…"Al2O3 nanoparticles in OSB panels," BioResources 17(2), 3014-3024. 3015 Although this type of panel is already prominent in the market, developing a more sustainable and rational material that meets the needs of the industrial segment and guarantees the same durability and characteristics presented by competing materials is essential (Lima et al 2018). Nanoscale materials are a new technological trend that may reveal new behaviors and properties, making nanoparticles a promising material with ease of deployment in this sector (Silva et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Influence of the addition of Al2O3 nanoparticles and the duration of pressing on the physical properties of OSB panels

Morais

et al. 2022

BioRes

For greater durability, materials must withstand contact with water, making it difficult for biodegrading agents to attack. The present study produced and evaluated the heat transfer for two pressing times and the physical properties of OSB panels, produced with pinewood strands and Al2O3 nanoparticles addition. The nanoparticles were synthesized through the sol-gel-protein method and added to the resin in the proportion of 0.5%. During the pressing process, heat transfer and distribution in the central region of the particle mat were evaluated using a type K thermocouple. After its fabrication, the panels were characterized to evaluate density, moisture content, thickness swelling, and water absorption. The results obtained indicated that the nanoparticle addition caused a refractory effect in the central region of the mat, leading to a small reduction in the pressing temperature for the 600 s cycle. However, there was no compromise in resin cure, indicating good interaction of the panels with nanoparticles in water contact, for both pressing times. There was an improvement in the panel thickness swelling with the addition of 0.5% of Al2O3 nanoparticles, with all properties meeting the Class 1 indicators of the EN 300 (2006) standard.

“…A agilidade do desenvolvimento tecnológico vem gerando a necessidade de constantes atualizações do processo produtivo, em um cenário em que a racionalização do uso de insumos é fator preponderante para a continuidade de diversos setores da indústria (LIMA et al, 2018).…”

Section: Introductionunclassified

“…O material utilizado, principalmente a resina, também interfere no desempenho físico-mecânico final. Assim, buscam-se novas tendências tecnológicas com potencial comprovado e disponibilidade de mercado para painéis de madeira reconstituída (LIMA et al, 2018).…”

Section: Introductionunclassified

ZnO nanoparticle: production and use for particleboard improvement

Maia

et al. 2023

CLIUM

The need for more technological products increases with nanomaterials as a viable proposal, presenting good results in many different industrial sectors, especially in wood panels. Particleboards are composites of wood that have been extensively studied, mainly in relation to the adhesives used in their manufacture, which have an influence on particleboard properties. Thus, as a way of improving these adhesives, zinc oxide nanoparticles were added, giving new properties to the particleboard. Thereby, the present work aimed to produce particleboard with the wood of Eucalyptus Urophila x Grandis hybrid and urea-formaldehyde adhesive with ZnO nanoparticles addition. The physical tests performed were density, moisture content, and thickness swelling. The mechanical tests performed were the modulus of elasticity, modulus of rupture, and bonding tests. The results obtained were submitted to statistical analysis and compared with the requirements standards, as well as with works found in the literature. The addition of zinc oxide nanoparticles did not exercise influence on mechanical tests; however, the physical properties were improved, mainly decreasing the thickness swelling, which is usually a problem for wood products.