Article Preliminary Investigation of the Properties of Oriented Strand Boards Produced Using Green Adhesives Mario Núñez-Decap 1,2, *, Felipe Díaz-Stuardo 1 , Marcela Vidal-Vega 1 , Camila Opazo-Carlsson 1 , Boris Moya-Rojas 1 and Vicente Hernández-Castillo 2,3
1 Department of Civil and Environmental Engineering, Universidad del Bío-Bío, Avenida Collao 1202, Concepción 4051381, Chile; felipe.diaz1502@egresados.ubiobio.cl (F.D.-S.); mvidalve@ubiobio.cl (M.V.-V.); copazo@ubiobio.cl (C.O.-C.); bmoya@ubiobio.cl (B.M.-R.) 2 Centro Nacional de Excelencia Para la Industria de la Madera (CENAMAD), Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 7820436, Chile; vhernandezc@udec.cl 3 Departamento de Manejo de Bosques y Medio Ambiente, Facultad de Ciencias Forestales, Universidad de Concepción, Victoria 631, Concepción 4070386, Chile * Correspondence: mnunez@ubiobio.cl; Tel.: +56-41-311-1968 Abstract: In this work, we sought to study the properties of OSB panels manufactured with new green adhesives for wood that can replace formaldehyde-based wood adhesives currently on the market. After the manufacturing of the OSB panels, physical, mechanical, thermal, and formaldehyde emissions tests were performed according to international standards. From the results, it was found that OSB panels produced with green adhesives are less susceptible to color change after UV exposure than an OSB panel manufactured with phenol-formaldehyde adhesive. Furthermore, the OSB panels produced with green adhesives presented statistically the same dimensional stability as an OSB panel manu- factured with phenol-formaldehyde adhesive. In terms of mechanical properties, sample OSB-1 outperformed the control sample by 7% (MOE flatwise) and 13% (MOR edgewise) and reached 68% of the tensile strength, 85% of the internal bond strength, and 87% of the Janka hardness of the control sample. Regarding the mechanical properties and formalde- hyde emissions evaluation results, all three OSB samples tested could be classified into OSB/2 of the E1 classification, which means that the OSB panels produced with green ad- hesives presented a performance comparable to that of the OSB panels manufactured with a formaldehyde-based wood adhesive. Hence, the green adhesives could be a potential replacement for the phenol-formaldehyde adhesive in the manufacturing of OSB panels because they yielded, in most cases, results equal to those for a control OSB panel.
Academic Editor: Meng Gong
Received: 26 March 2025 Revised: 28 April 2025 Accepted: 12 May 2025 Published: 17 May 2025
Citation: Núñez-Decap, M.; Díaz-Stuardo, F.; Vidal-Vega, M.; Opazo-Carlsson, C.; Moya-Rojas, B.; Hernández-Castillo, V. Preliminary Investigation of the Properties of Oriented Strand Boards Produced Using Green Adhesives. Buildings 2025 , 15 , 1702. https://doi.org/ 10.3390/buildings15101702 Copyright: © 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/ licenses/by/4.0/).
Keywords: bio-based wood adhesives; wood products; OSB; phenol-formaldehyde
1. Introduction Flakeboard or oriented strand board (OSB) is a panel designed primarily for structural use. It is made from wood fibers bonded with a resin that is impermeable under pres- sure and heat and used for roof, wall, and floor sheathing in residential and commercial construction. In general, in the OSB manufacturing process, debarked logs are heated and then cut into thin pieces of wood, forming the wood flakes, and subsequently mixed with resin and wax and shaped into thick, loosely consolidated mats that are pressed with pressure and a temperature between 177 and 204 ◦ C for 3–5 min for general resin curing [1]. Oriented strand boards are composed of layers of wood flakes, usually three, where each layer is pressed with the chips oriented in the same direction, and then the layers are joined
Buildings 2025 , 15 , 1702
https://doi.org/10.3390/buildings15101702
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