Abstract
Plywood is normally produced with urea-formaldehyde and/or phenol-formaldehyde adhesives. However, the former is considerably toxic and environmentally damaging, while the latter is expensive, thus motivating the search for alternative raw materials in plywood production. The castor oil-based polyurethane adhesive developed at the São Carlos Institute of Chemistry, University of São Paulo, is an environmentally friendly vegetal oil-based polymer that is harmless to humans. The wood species Eucalyptus grandis offers favorable properties for plywood the manufacture. The study reported on here involved the use of castor oil-based polyurethane adhesive to produce plywood with Eucalyptus grandis layers. The plywood's performance was evaluated based on the results of physical and mechanical tests recommended by the Brazilian code, ABNT. Tests results showed higher values than those reported in the literature and recommended by the ABNT, indicating that the castor oil-based polyurethane adhesive is a promising glue for the manufacture of plywood.
Highlights
The advantage of wood-based products is that the wood’s properties can be improved through the application of science and technology
The results reported by these authors demonstrated that castor oilbased polyurethane adhesive is a good alternative for the technological use of glued laminated timber (GLT)
The plywood panels produced with castor oil-based polyurethane adhesive showed highly satisfactory results
Summary
The advantage of wood-based products is that the wood’s properties can be improved through the application of science and technology These products include wood panels, or plywood, whose consumption around the world and in Brazil has grown steadily. An alternative adhesive deriving from a natural and renewable source, castor oil-based polyurethane adhesive is classified as impermeable and non-aggressive to the environment and to humans, besides representing a Brazilian technology. This adhesive is cured at ambient temperature, but curing can be accelerated using temperatures of 60 to 90 °C, and it is believed that its large scale availability on the market. The layered-based panel include plywood, which consists of thin layers of wood superposed orthogonally and glued together, their fibers laid in alternate directions
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