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Improvement of the durability of clear coatings by grafting of UV-absorbers on to wood

L’amélioration de la durabilitié de vernir clairs par le greffage des absorbants UV aux surfaces de bois

Verbesserung der Dauerhaftigkeit der Klarlacken durch die Einfugung der UV-Absorber in Holz-Oberfläche

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Surface Coatings International Part B: Coatings Transactions

Summaries

The photochemical resistance of polymers can be improved greatly by using grafted photostabilisers. This method was used here to improve the photostability of wood and the performance of clear coatings on wood. Reactive UV absorbers (UVAs), including 2-hydroxy-4 (2,3-epoxypropoxy) benzophenone (HEPBP) and some epoxy-functionalised triazine-type UVAs, were synthesised and the reaction conditions required to graft UVAs on to wood were examined. Grafting of reactive UVAs was more effective than UVA treatments without grafting or than chromium trioxide modification for restricting losses in weight and tensile strength of thin wood veneers during weathering. Grafting UVAs on to wood reduced photochemical changes at exposed wood surfaces and greatly improved the performance of clear coatings on modified veneer surfaces.

Résumé

La résistance photochimique de polymères peut être largement augmentée par l’emploi de photostabilisants greffés à la surface des bois. Cette méthode était utilisée en vue d’améliorer la photostabilité de bois et en même temps le rendement de vernis clairs sur les surfaces de bois. On a synthésisé des absorbants UV réactifs (UVAs) y compris 2-hydroxy-4(2,3-époxypropoxy) benzophénone (HEPBP) et certains UVAs du type triazine époxy-functionalisé et on a étudie les conditions nécessaires pour effectuer le greffage au bois des UVAs. Le greffage d’un UVA était plus efficace que de traitement par UVA sans greffage ou par modification avec le trioxide de chrome pour limiter les pertes en poids et de la force de tension d’un placage mince au cours d’une exposition aux intempériesl Le greffage de UVAs sur bois reduit les changements photochimiques aux surfaces de bois exposées et améliore largement le rendement de vernis clairs sur les surfaces vernis après leur modification.

Zusammenfassung

Die photochemische Bestänndigkeit der Polymeren lässt sich durch das Aufpfropfen der aufgepfropften Photostabilisatoren stark verbessert. Diese Methode wurde von die Photostabilität des Holzes und die Leistung der Klarlacken auf Holzüberflächen zu verbessern. Reacktive UV-Absorber (UDAs) mit 2-Hydroxy-4(2,3-epoxypropoxy)benzophenon (HEPBP) und einige epoxyfunktionisierte Triazosorten der UVAs wurden die Reaktions-bedingungen notwendig die UVAs aufzupfropfen synthesisiert und untersucht. Aufpfropfen den reaktiven UVAs war wirksamer als UVA-Behandlung ohne Aufpfropfen oder durch Chromtrioxid, Gewichts und Zugfestigkeitsverluste der dünnen Holzfurnieren wahrend Aussenbewitterung. UVAs aufgepfropf dem Holz stark verbessert die Leistung der Klarkacke auf modifierten Furnieroberflächen.

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Authors and Affiliations

  1. Wood Chemistry Division, Forestry and Forest Products Research Institute, Tsukuba, Norin, PO Box 16, 305-8687, Ibaraki, Japan

    M Kiguchi & Y Kataoka

  2. University of British Columbia, Vancouver, Canada

    PD Evans

  3. Swedish Institute for Wood Technology Research, Stockholm, Sweden

    J Ekstedt

  4. USDA Forest Products Laboratory, Madison, USA

    RS Williams

Authors
  1. M Kiguchi
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  2. PD Evans
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  3. J Ekstedt
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  4. RS Williams
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  5. Y Kataoka
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Correspondence to M Kiguchi.

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Kiguchi, M., Evans, P., Ekstedt, J. et al. Improvement of the durability of clear coatings by grafting of UV-absorbers on to wood. Surface Coatings International Part B: Coatings Transactions 84, 263–270 (2001). https://doi.org/10.1007/BF02700407

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