Alternative castor oil-based polyurethane adhesive used in the production of plywood

Dias, F.T.; Lahr, Francisco Antônio Rocco

doi:10.1590/s1516-14392004000300007

Cited by 31 publications

(28 citation statements)

References 2 publications

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“…In a similar study, Dias and Lahr (2004) conducted experiments with plywood that was produced from E.grandis veneers bonded with castor oil-based polyurethane adhesive, and the MOR and MOE values of the five-ply plywood samples were found to be greater in the parallel samples than in the perpendicular samples.…”

Section: Universidad Del Bío -Bíomentioning

confidence: 99%

“…For example, some other researchers have investigated the fast-growing species of hybrid poplar (Populus x eureamericana) (Baldassino et al 1998) and Eucalyptus grandis (Dias and Lahr 2004, Iwakiri et al 2006, Juniar et al 2009, as well as the slow-growing beech species (Fagus orientalis) for use in manufacturing plywood (Örs et al 2002(Örs et al , Demirkır et al 2005(Örs et al , Özalp et al 2009). …”

Section: Introductionmentioning

confidence: 99%

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Some mechanical properties of plywood produced from eucalyptus, beech, and poplar veneer

Bal

Bektaş²

2014

Maderas, Cienc. tecnol.

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In this study, we determined the flexural properties and tensile shear strength of five-ply plywood panels produced with eucalyptus (Eucalyptus grandis), beech (Fagus orientalis), and hybrid poplar (Populus x euramericana) using urea-formaldehyde (UF), melamine-urea-formaldehyde (MUF) and phenol-formaldehyde (PF) adhesives. Flexural properties were tested on both parallel and perpendicular to grain samples. Tensile shear-strength tests were conducted on four glue lines of the plywood panels, and the effects of species of trees, type of adhesives, and direction of load were determined. The results of variance analyses showed that the effects of species of trees, direction of load, and type of adhesive on flexural properties were significant, but it was determined by specific flexural properties that the effect of the type of adhesive was based on the density of the plywood. In addition, as a result of findings, it can be said that specific mechanical properties may be a good predictor for comparative studies.

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Section: Universidad Del Bío -Bíomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Some mechanical properties of plywood produced from eucalyptus, beech, and poplar veneer

Bal

Bektaş²

2014

Maderas, Cienc. tecnol.

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“…For example, some researchers have investigated the fast-growing species of hybrid Poplar (Baldassino et al 1998, Bao et al 2001 and Eucalyptus (Dias and Lahr 2004, Iwakırı 2006, Júnior et al 2009, Saviana et al 2009, Bal and Bektaş 2012a. In addition, in some previous studies, it was stated that Eucalyptus LVL has mechanical properties that are superior to those of Poplar LVL (Bal and Bektaş 2012a, b).…”

Section: Introductionmentioning

confidence: 99%

Some technological properties of laminated veneer lumber produced with fast-growing Poplar and Eucalyptus

Bal

2016

Maderas, Cienc. tecnol.

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Fast-growing tree species are important due to their short growth time before they are harvested. Both the Poplar and Eucalyptus species are fast-growing trees. These two species have been cultivated in many parts of the world, and they are used in several ways, including in the pulp and paper industry, as wood-based panels, and as structural composite lumber. In this study, laminated veneer lumbers were produced using different combinations of Poplar (Populus x euramericana I-214) and Eucalyptus (Eucalyptus grandis) veneers. Some physical and mechanical properties, including density, thickness swelling, water absorption, modulus of elasticity, modulus of rupture, impact bending, and bonding performance were investigated. According to the test data that were obtained, the mechanical properties of laminated veneer lumbers produced with Eucalyptus were greater than those of laminated veneer lumbers produced with Poplar. When the two were combined and Eucalyptus was used as the top and bottom plies, the mechanical properties also were better than those of Poplar laminated veneer lumbers. As a result, it can be said that both Poplar and Eucalyptus veneers can be used to produce laminated veneer lumbers, and Poplar laminated veneer lumbers can be reinforced with Eucalyptus veneers.

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“…normally observed in plywood [13][14][15][16][17][18] . To strengthen the mechanical properties of plywood, polyurethane adhesives give good results and recently introduced 19 .Some disadvantages such as shorter pot life, durability and higher cost observed in acrylate based adhesives 20,21 . Polyurethane adhesives made from synthetic chemicals are nonbiodegradable, costly and difficult to find raw materials from local market.…”

Section: Introductionmentioning

confidence: 99%

Biomaterial based novel polyurethane adhesives for wood to wood and metal to metal bonding

et al. 2009

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Polyurethane adhesives made from synthetic chemicals are non-biodegradable, costly and difficult to find raw materials from local market. To avoid solid pollution problem, cost effectiveness and easy availability of raw materials, biomaterials based polyurethane adhesives are used in current industrial interest. Direct use of castor oil in polyurethane adhesive gives limited hardness. Modification on active sites of castor oil to utilize double bond of unsaturated fatty acid and carboxyl group yields new modified or activated polyols, which can be utilized for polyurethane adhesive formulation. In view of this, we have synthesized polyurethane adhesives from polyester polyols, castor oil based polyols and epoxy based polyols with Isocyanate adducts based on castor oil and trimethylolpropane. To study the effects of polyurethane adhesive strength (i.e. lap shear strength) on wood-to-wood and metal-to-metal bonding through various types of polyols, cross-linking density, isocyanate adducts and also to compare adhesive strength between wood to wood and metal to metal surface. These polyols and polyurethanes were characterized through GPC, NMR and IR-spectroscopy, gel and surface drying time. Thermal stability of PU adhesives was determined under the effect of cross-linking density (NCO/OH ratio). The NCO/OH ratio (1.5) was optimized for adhesives as the higher NCO/OH ratio (2.0) increasing cross-linking density and decreases adhesion. Lower NCO/OH ratio (1.0) provideslow cross-linking density and low strength of adhesives.

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Alternative castor oil-based polyurethane adhesive used in the production of plywood

Cited by 31 publications

References 2 publications

Some mechanical properties of plywood produced from eucalyptus, beech, and poplar veneer

Some mechanical properties of plywood produced from eucalyptus, beech, and poplar veneer

Some technological properties of laminated veneer lumber produced with fast-growing Poplar and Eucalyptus

Biomaterial based novel polyurethane adhesives for wood to wood and metal to metal bonding

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