Isocyanate Resins for Particleboard: PMDI vs EMDI

Papadopoulos, Antonios N.; Hill, Callum A. S.; Traboulay, Eric A.; Hague, J.

doi:10.1007/s00107-001-0275-8

Cited by 41 publications

(29 citation statements)

References 1 publication

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“…However, values reported in literature refer to particleboards made with formaldehyde based adhesives. Isocyanate in castor oil base PU resin requires more MC particles, as outlined by Nascimento 9 , to promote the reaction with hydroxyl groups compounding lignocellulosic material 31 . According to Silva 32 , besides the main reaction among resin components, other reactions can occur, as isocyanate (highly reactive group) with water, releasing carbon dioxide (CO 2 ) and thereby facilitating polymer expansion.…”

Section: Particles Characterizationmentioning

confidence: 99%

“…Results obtained by Kojima and Suzuki 10 demonstrate adhesive influence in properties after aging, once panels containing isocyanate-based resin had better properties retention. According Papadopoulos et al 31 , wood-based panels bonded with MDI exhibit extreme resistance to humidity, low levels of swelling and high mechanical strength. Figure 7 shows bending specimens before and after aging, samples in conditions NA, AAA and AAAS .…”

Section: Times/samplesmentioning

confidence: 99%

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Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

et al. 2013

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Tests simulating exposure to severe weather conditions have been relevant in seeking new applications for particleboard. This study aimed to produce particleboards with residues of CCB (chromium-copper-boron oxides) impregnated Pinus sp. and castor oil-based polyurethane resin, and to evaluate their performance before and after artificial accelerated aging. Panels were produced with different particle mass, resin content and pressing time, resulting eight treatments. Particles moisture and size distribution were determined, beyond panel physical and mechanical properties, according to NBR14810-3: 2006. After characterization, treatments B and G (small adhesive consumption and better mechanical performance, respectively) were chosen to artificial aging tests. Statistical results analysis showed best performances were achieved for waterproof aged samples, of both B and G treatments. As example, in treatment B, MOR and MOE values were 23 MPa and 2,297 MPa, samples before exposure; 26 MPa and 3,185 MPa, 32 MPa and 3,982 MPa for samples after exposure (non-sealed and sealed), respectively.

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Section: Particles Characterizationmentioning

confidence: 99%

Section: Times/samplesmentioning

confidence: 99%

Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

et al. 2013

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“…Modification UF with the use of various natural derived materials like tannin, lignin, cellulose, crude pyrolysis oil of wood, and soy have been carried out [54] [55] [56] [57]. Also combination of UF and MF is used for plywood industries.…”

Section: Other Polymer Additionmentioning

confidence: 99%

Factor Affecting Gel Time/Process-Ability of Urea Formaldehyde Resin Based Wood Adhesives

Gadhave¹,

Mahanwar²,

Gadekar³

2017

OJPChem

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Urea-formaldehyde (UF) resin presents the most utilized adhesive system in the manufacture of plywood, particleboard and fiberboard. At the temperatures above 100˚C in the presence of hardener, this resin undergoes crosslinking reaction and the formation of three dimensional cross linked structures takes place and bonding of wood particles in a hot press [1]. UF powder resins show high reactivity and good performance in the production and by their low price; however they lack in water resistance of the hardened resin [2]. Urea-formaldehyde (UF) resins are the most important type of adhesive resins for the production of wood based panels but process-ability and curing behavior of urea formaldehyde resin depended on various factors related to resin properties, types of wood and their properties, amount & type of catalyst, types and amount of polymers addition and environmental conditions [3]. This factor decides the process-ability of UF resin based composite during manufacturing of plywood, particle board and fiberboard. In this review paper, various factors affecting gel time and process-ability of UF resin based wood composite are reviewed.

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“…Of these resins, polymeric methylene di(phenyl isocyanate) (pMDI) was used in Germany for the first time in the early 1970s to manufacture particleboards. Since then, it has been widely used for the production of fiberboards and OSB in Europe and used by a few medium-density fiberboard mills in North America (Papadopoulos et al 2002). The pMDI resin penetrates deeper into wood cell walls than PF resins used to manufacture OSB (Johnson and Kamke 1994;Frazier and Schmidt 1996;Kamke and Lee 2007), which is related to the low molecular weight of pMDI, as well as the low surface tension.…”

Section: Introductionmentioning

confidence: 99%

Some Physico-mechanical Characteristics of Uncoated OSB ECO-products Made from Scots Pine (Pinus sylvestris L.) and Bonded with pMDI Resin

et al. 2018

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Some mechanical and physical properties and the formaldehyde content of uncoated oriented strand boards (OSBs) that were made from Scots pine (Pinus sylvestris L.), manufactured with different thicknesses, and bonded with polymeric methylene di(phenyl isocyanate) (pMDI) resin were evaluated. All of the mechanical and physical properties were affected significantly by the OSB type (3 and 4) and thickness of the panels, except for the thickness swelling after 24 h and measured formaldehyde content. The measured mechanical and physical properties of the OSB panels satisfied the standard requirements. The densities of the panels ranged from 554.2 kg/m 3 to 580.2 kg/m 3 and from 573.8 kg/m 3 to 610.7 kg/m 3 for OSB/3 and OSB/4, respectively, which met the standard requirements. The measured mechanical and physical properties of the OSB/4 panels were higher than those of the OSB/3 panels, but there were no differences in the thickness swelling after 24 h and measured formaldehyde content. Low formaldehyde contents were found for OSB/3 (0.00 mg/100 g and 0.29 mg/100 g) and OSB/4 (0.18 mg/100 g and 0.47 mg/100 g).

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Isocyanate Resins for Particleboard: PMDI vs EMDI

Cited by 41 publications

References 1 publication

Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

Factor Affecting Gel Time/Process-Ability of Urea Formaldehyde Resin Based Wood Adhesives

Some Physico-mechanical Characteristics of Uncoated OSB ECO-products Made from Scots Pine (Pinus sylvestris L.) and Bonded with pMDI Resin

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