Efficiency of castor oil-based polyurethane in the production of plywood panels

Abstract

Plywood panels are produced with polymeric adhesives derived from petroleum that can be hazardous to health and the environment, since they are made from non-renewable sources and contain organic solvents in their composition, which can cause diseases such as cancer. Polyurethane adhesives derived from castor oil-based are an alternative to those materials, because it is biodegradable and non-hazardous. The aim of this work was to evaluate the mechanical properties of plywood panels made with polyurethane adhesive derived from castor oil-based. Panels were produced with five sheets of Pinus caribaea bahamensis wood and three different adhesives: urea-formaldehyde, phenol formaldehyde, and polyurethane with a glue spread line of 180 g/m 2 for phenolic adhesives, and 120, 140, 160, 180 g/m 2 for polyurethane. The panels were evaluated in terms of specific mass, shear strength before and after immersion on boiling and cold water, in cycle and without immersion, and bending strength parallel and perpendicular to the fibers orientation. Results were statistically analyzed. The plywood panels produced with polyurethane adhesive derived from castor oil have superior shear strength and bending strength similar than those produced with the others tested adhesives, and the weight of 120 g/m 2 is the most suitable for bonding.

Comparative Study of Plywood Boards Produced with Castor Oil-Based Polyurethane and Phenol-Formaldehyde Using Pinus taeda L. Veneers Treated with Chromated Copper Arsenate

“…There was also no significant difference in the specific apparent mass between the control panels and with CCA in the paper of Ferreira et al [9] and Mendes et al [33], nor between the Pinus sylvestris panels made with PF and PU by Wilczak et al [34], which is in line with the results obtained in this research. In the study by Setter et al [35], the use of distinct formaldehyde-based adhesives (phenol and urea) also did not significantly affect the specific mass of the panels produced with pine veneers.…”

“…So, it is possible to observe that plywood panels produced with both adhesives for all treatments meet the requirements of ABNT NBR ISO 12466-2:2012 and also exceed the minimum of 18 kgf/cm 2 recommended by ABIMCI [32] for five layer panels. Wilczak et al [34] also obtained values above 2 MPa for plywood panels produced with PF and PU, and their reference panels. Furthermore, Setter et al [35] reached 1.68 MPa for pine and PF resin panels.…”

“…In their research, Wilczak et al [34] For static bending in the perpendicular direction (Table 9), there was no significant difference for the modulus of elasticity (MOE⊥) of the treatments (F-value = 0.9051; p-value = 0.3693 > 5%), nor for the MOE⊥ of the different adhesives (F-value = 1.1901; p-value = 0.36276 > 5%). There was no interaction (Figure 8a) for MOE⊥ (F-value = 0.0047; pvalue = 0.9471 > 5%).…”

“…Wilczak et al [34] From the interaction graphics (Figure 8), it can be observed that there was no crossover between the lines in MOE⊥ (Figure 8a) and there was a crossover in MOR⊥ (Figure 8b). Therefore, it can be concluded that there was no significance in the interaction of the factors for MOE⊥, but there was significance for MOR⊥, which caused an inversion of values between the factors.…”

Empleo de placas de residuos de desmote de algodón y resina urea-formaldehido para el mejoramiento de envolventes horizontales en viviendas

“…Se ha evaluado la posibilidad de empleo de otras resinas con menor nivel de emisión de formaldehido, tales como las resinas urea-formaldehído modificada con melamina y las basadas en fenol-formaldehído (Salem, M. et al, 2011), detectando que su disponibilidad en el medio es menor y su costo muy superior. Por otra parte, en el caso de las resinas basadas en aceite de ricino o derivadas de la soja no se producen en el país o lo hacen en escala de laboratorio incompatible con la producción de estas placas (Doroteja, V. et al, 2017) (Wilczak, L. et al, 2019). Por otro lado, según los resultados del censo 2010 (INDEC) se estima que, del total de las viviendas de la Argentina, el 11.55 % poseen cubiertas de chapas sin ningún tipo de cielorraso.…”