Utilização da madeira de Pinus oocarpa e Coffea arábica para a produção de painéis de partículas orientadas (OSB)

Santos, Carolina Aparecida dos; Furtini, Ana Carolina Corrêa; Villarruel, Denisse Concepción Vega; Miranda, Eduardo Hélio de Novais; Gomes, Diogo Antonio Correa; Mendes, Lourival Marin; Júnior, José Benedito Guimarães

doi:10.33448/rsd-v11i3.26795

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…who reported an average of 6,18 % andBrito et al (2021) who obtained an average of 6,34 %. The higher value is considered ideal, because the lignin contributes to the adhesion mechanisms and may contribute to the bonding process of the panels.Regarding the ash,Santos et al (2022) have found a content of 1,20 % close to the present study. However,Andrade et al (2019) obtained a lower content of 0,20 %.…”

supporting

confidence: 89%

Utilization of nanotalc modified adhesives in plywood panels

Lourenço,

Aparecida dos Santos,

Corrêa Furtini

et al. 2024

Maderas-Cienc Tecnol

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As an alternative for the partial replacement of synthetic adhesives are the modifications that occur still during their synthesis, to improve and adhere new properties. Among the possible materials used in nanoscale, talc is a mineral material of natural origin and a promising raw material due to its low cost, lightness, natural hydrophobicity. Due to the scarcity of studies with the insertion of nanotalc in adhesives, this study aimed to produce plywood panels bonded with phenol-formaldehyde adhesive nanomodified with talc to evaluate its physical-mechanical resistance when compared to conventional synthetic adhesives. To carry out this study, three Pinus oocarpa trees with 28 years of age were used. Different concentrations of talc were used in the formulation with the phenol-formaldehyde adhesive, being the treatments 0; 0,05; 1; 1,5 and 2 % of talc (mass/mass) in relation to the adhesive, with three panels per treatment, totaling 15 panels. The pressing time was 8 minutes with temperature of 160 ºC and pressure of 1 MPa. The physical-chemical characteristics of the lignocellulosic material and of the plywood panels were determined. The quality of the adhesive produced was demonstrated by its resistance to water absorption with the insertion of up to 2 % talc to the adhesive, reducing it considerably. From 1 % talc inserted, the plywood panels had their mechanical characteristics superior to those glued with pure phenol-formaldehyde adhesive. However, as the study is innovative in nature, further research should focus on the application and quality evaluation of other talc nanomodified adhesives on different types of wood panels.

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supporting

confidence: 89%

Utilization of nanotalc modified adhesives in plywood panels

Lourenço,

Aparecida dos Santos,

Corrêa Furtini

et al. 2024

Maderas-Cienc Tecnol

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“…For extractives and lignin, the hydrophobic compounds of low molecular weight in the bean residues presented respective values of 8.16% and 8.13%. The values for lignin were lower than those obtained for soybean residues (22,04%)(Borges et al 2022) and coffee wastes (29,28%)(Santos et al 2022). The values of extractives were lower than those obtained from sugarcane bagasse (19,59%)(Soares et al 2017) and soybean residues (13,69%)(Borges et al 2022).…”

contrasting

confidence: 57%

Valorization of bean agricultural wastes for the production of polymeric composites

Miranda

Gomes

Andrade

et al. 2023

Preprint

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The objective of this study is to evaluate the characteristics of polymeric composites containing different bean residue levels for polymer replacement. To this end, agricultural residues were first reduced to particles and characterized "in natura" through tests for moisture content, bulk density, content of extractives, lignin and ash and by thermogravimetry technique. Then, particles of both materials were dried and selected based on their granulometric fractions to make low-density polyethylene (LDPE) composites with substitution levels of 0, 10, 20, 30 and 40% bean residues. The polymeric material and the bean stem and pod particles were hot-extruded to obtain strands and then pellets; the resulting materials were then molded and hot-pressed. After fabrication, the specimens were subjected to physical testing for humidity, density, water absorption, and flammability and to mechanical testing for tensile strength. Scanning electron microscopy (SEM) was performed to evaluate the fracture regions of the specimens that were broken during mechanical testing. The results indicated that the physical–mechanical properties of the composites were negatively affected by the characteristics of the lignocellulosic material and by the increased number of pores caused by the presence of the waste material.

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“…For extractives and lignin, hydrophobic compounds of low molecular weight in the bean residues presented respective values of 8.16% and 8.13%. The values for lignin were lower than those obtained for soybean residues (22.04%) (Borges et al 2022) and coffee wastes (29.28%) (Santos et al 2022). The values of extractives were lower than those obtained from sugarcane bagasse (19.59%) (Soares et al 2017) and soybean residues (13.69%) (Borges et al 2022).…”

Section: Bean Residue Characterizationmentioning

confidence: 57%

Valorization of bean agricultural wastes for the production of polymeric composites

Miranda,

Gomes,

Andrade

et al. 2024

JER

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The objective of this study is to evaluate the characteristics of polymeric composites containing different levels of addition of bean residue. To this end, agricultural residues were first reduced to particles and characterized "in natura" through tests for moisture content, bulk density, content of extractives, lignin and ash and by thermogravimetry technique. Then, the particles were dried and selected based on their granulometric fractions to make low-density polyethylene (LDPE) composites with addition levels of 0, 10, 20, 30 and 40% bean residues. The polymeric material and the bean waste particles were hot-extruded to obtain strands and then pellets; the resulting materials were then molded and hot-pressed. After fabrication, the specimens were subjected to physical testing for humidity, density, water absorption, and flammability and to mechanical testing for tensile strength. Transmission electron microscopy (TEM) also was performed. The results showed that the lignocellulosic material had decreased density and mechanical properties and increased water absorption properties after 24 h of immersion, and the moisture content in the samples increased as a function of bean waste substitution level in the polymer composite materials. These results may be related to the intrinsic chemical characteristics demonstrated by this material in the physicochemical characterization: low density and low contents of holocellulose, lignin and extractives. The mechanical properties were also influenced by the pores created by the bean particles, which may have contributed to the creation of larger zones of weakness in the samples.

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Utilização da madeira de Pinus oocarpa e Coffea arábica para a produção de painéis de partículas orientadas (OSB)

Cited by 6 publications

References 8 publications

Utilization of nanotalc modified adhesives in plywood panels

Utilization of nanotalc modified adhesives in plywood panels

Valorization of bean agricultural wastes for the production of polymeric composites

Valorization of bean agricultural wastes for the production of polymeric composites

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