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Improved water resistance of UF adhesives for plywood by small pMDI additions

  • Hamid Reza Mansouri
  • Antonio PizziEmail author
  • Jean-Michel Leban
ORIGINALARBEITEN ORIGINALS

Abstract

Addition of small amounts of isocyanate (pMDI), between 10% and 15% by weight, to UF resins for plywood considerably improve the UF glue line water resistance. Analysis of the plywood by X-ray microdensitometry indicate that on both sides of the glue lines there is a local density increase which reflects either some adhesive diffusion in the wood layers immediately in contact with the glue line, or some extent of wood densification as a result of the gluing process, or both.

Keywords

Isocyanate Glue Line Plywood Panel Hybrid Resin Wood Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Adcock T, Wolcott MP, Peyer SM (1999) Urea formaldehyde/diphenylmethane diisocyanate copolymer adhesives: possible use as an adhesive system for straw based particleboard. In: Proceedings of the third European panel products symposium, Llandudno, UK, pp 67–76Google Scholar
  2. 2.
    Despres A, Pizzi A, Delmotte L (2005) 13C NMR investigation of the reaction in water of UF resins with blocked emulsifiable isocyanates. J Appl Polym Sci (in press)Google Scholar
  3. 3.
    Pizzi A, Valenzuela J, Westermeyer C (1993) Non-emulsifiable, water-based diisocyanate adhesives for exterior plywood – Part 2: theory application and industrial results. Holzforschung 47(1):69–72CrossRefGoogle Scholar
  4. 4.
    Pizzi A, Walton T (1992) Non-emulsifiable, water-based diisocyanate adhesives for exterior plywood – Part 1: novel reaction mechanisms and their chemical evidence. Holzforschung 46(6):541–547Google Scholar
  5. 5.
    Shadurka V, Binder WG, Dunky M, Kantner W (2003) Blocked isocyanates in UF resins: reaction pathways and cross-linking. In: Proceedings of the 7th panel products symposium, Llandudno, Wales, UK, October 2003, pp 57–69Google Scholar
  6. 6.
    Simon C, George B, Pizzi A (2002) UF/pMDI wood adhesives: networks blend vs. copolymerization. Holzforschung 56(3):327–334CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Hamid Reza Mansouri
    • 1
  • Antonio Pizzi
    • 1
    Email author
  • Jean-Michel Leban
    • 1
  1. 1.Dept. of Wood Science and TechnologyUniversity of ZabolZabolIran

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