Combinations of Low Formaldehyde-Aminoplast Glues and PMDI

Tinkelenberg, A.; Vaessen, Henricus Wilhelmus Leonardus Marie; Suen, K.W.; Leusink, P. G. J.

doi:10.1080/00218468208073205

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…People have tried to mix MDI with traditional wood industry adhesives for decades in order to decrease cost or to improve mechanical properties (Tinkelenberg et al, 1982;Pizzi and Walton, 1992;Liu, 1993a, 1993b;Pizzi et al, 1993;Deppe, 1997;Grigoriou, 2000;Frick and Motter, 2001;Simon et al, 2002). However, spray application of UF and/or MDI adhesives to wood particles remained a bone of contention.…”

Section: Introductionmentioning

confidence: 99%

“…However, when the two adhesives were mixed and then sprayed, the board's internal bonding strength was reduced to only 30%-50% of its original strength. Tinkelenberg et al (1982) asserted that the isocyanate group (-NCO) is capable of reacting with active hydrogen in almost any form under either acid or alkaline conditions. The glue mixture was assembled by adding MDI to the UF resin, mixing and subsequently adding other components, including NH 4 Cl.…”

Section: Introductionmentioning

confidence: 99%

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Adhesive application method in MDI-UF particleboard manufacture

Wang

Zhang

2006

Front. Forest. China

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Peanut hull residues were considered for the manufacturing of particleboards. Various concentrations of two types of adhesive-polymeric diphenylmethane diisocyanate (MDI) and urea-formaldehyde (UF)-were separately combined with four types of peanut hull particles (fine, mixed, coarse particles, and peanut hull powder) to manufacture particleboards with a certain target density. The confidence level of the effect of the selected production parameters on the physical and mechanical properties of the panels was evaluated. The results showed that increasing the adhesive mass percentage significantly improved the dimensional stability of the boards. A better mechanical performance was achieved for the MDI-bonded boards compared with the UF-bonded boards. Superior bonding between the MDI adhesive and the peanut hulls with different particle geometries was also observed; the peanut hull powder and coarse particles were unsuitable for the manufacturing of panels, due to the risk of an internal blowout. The water resistance of the panels was poor, whereas the mechanical strength of the peanut hull particleboard met the class M-1 requirement of the ANSI A208.1 (2009) standard for wood particleboard.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adhesive application method in MDI-UF particleboard manufacture

Wang

Zhang

2006

Front. Forest. China

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Melamine Resins

Binder¹,

Dunky²,

Jahromi³

2005

Kirk-Othmer Encyclopedia of Chemical Technology

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Melamine‐based resins [MF, MUF, MUPF, PM(U)F] used as wood adhesives represent one of the largest groups of aminoplastic resins. They are made by the reaction of formaldehyde with melamine using urea, phenol, or other components as comonomers. The hardened resins show duroplastic hardening behavior; they are three‐dimensionally cross‐linked and hence insoluble, nonmeltable networks. Analytical methods to determine the chemical identity of the complex mixtures (ie, nmr spectroscopy, ir spectroscopy, hplc, as well as mass spectrometry) are described in this article. Melamine‐based resins show higher hydrolysis resistance compared to UF resins. The field of application comprises the production of wood‐based panels such as particleboards, MDF, OSB, plywood, blockboards, and others especially for use under humid conditions. The molar ratio between formaldehyde/reactive amino groups [F/(NH 2 ) 2 ] distinctly determines reactivity, the degree of cross‐linking, and hence the bonding strength. Cocondensation between melamine, formaldehyde, and other components (such as urea and phenol) is possible, furnishing cocondensates with improved properties and reduced price. The possiblity of increasing the impact strength of MF resins using rubber toughening technology is examined.

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Melamine–Formaldehyde Resins

Binder

Dunky

2004

Encyclopedia of Polymer Science and Technology

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Melamine‐based resins [MF, MUF, MUPF, PM(U)F] used as wood adhesives represent one of the largest groups of aminoplastic resins. They are made by the reaction of formaldehyde with melamine using urea, phenol, or other components as comonomers. The hardened resins show duroplastic hardening behavior; they are three‐dimensionally cross‐linked and hence insoluble, nonmeltable networks. Analytical methods to determine the chemical identity of the complex mixtures (ie, NMR spectroscopy, IR spectroscopy, HPLC, as well as mass spectrometry) are described in this article. Melamine‐based resins show higher hydrolysis resistance compared to UF resins. The field of application comprises the production of wood‐based panels such as particleboards, MDF, OSB, plywood, blockboards, and others especially for use under humid conditions. The molar ratio between formaldehyde/reactive amino groups [F/(NH 2 ) 2 ] distinctly determines reactivity, the degree of cross‐linking, and hence the bonding strength. Cocondensation between melamine, formaldehyde, and other components (such as urea and phenol) is possible, furnishing cocondensates with improved properties and reduced price.

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Combinations of Low Formaldehyde-Aminoplast Glues and PMDI

Cited by 9 publications

References 3 publications

Adhesive application method in MDI-UF particleboard manufacture

Adhesive application method in MDI-UF particleboard manufacture

Melamine Resins

Melamine–Formaldehyde Resins

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