Wood protection with dimethyloldihydroxy- Ethyleneurea and its derivatives

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Autor/in:
Erscheinungsjahr:
2014
Medientyp:
Text
Schlagworte:
  • Wood
  • Weathering
  • Thermal modification
  • Timber
  • Wood Products
  • Wood
  • Weathering
  • Thermal modification
  • Timber
  • Wood Products
Beschreibung:
  • The low-molecular-weight N-methylol compounds, dimethyloldihydroxyethyleneurea (DMDHEU) and its derivatives, have been successfully used to modify wood. The N-methylol compounds can penetrate and react in wood cell walls. The reaction modes may be crosslinking of cell wall polymers by DMDHEU and/or self-condensation of DMDHEU within the cell wall. As a result, the modified wood exhibits a permanent cell wall bulking; the swelling and shrinkage is reduced, depending on the modification levels. This causes an improved anti-swelling efficiency of up to 70%. Modification does not substantially influence the equilibrium moisture content of wood but improves the durability against white, brown, and soft rot fungi. The treatments also enhance the wood's surface hardness and compression strength, but do not change its flexural properties. The adhesion of coatings on the modified wood is greater than on the untreated wood and the weathering properties of both uncoated and coated wood are improved. The simple processing, enhanced material properties, and acceptable production cost make this modification technique applicable to industry. © 2014 American Chemical Society.
Lizenz:
  • info:eu-repo/semantics/restrictedAccess
Quellsystem:
Forschungsinformationssystem der UHH
Interne Metadaten
Quelldatensatz
oai:www.edit.fis.uni-hamburg.de:publications/6c9b7e45-4901-4a50-b95e-8c844ccc068f