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European Journal of Wood and Wood Products

, Volume 69, Issue 2, pp 213–220 | Cite as

Cure properties and adhesive performances of cure-accelerated phenol-urea-formaldehyde resins

  • Dong-Bin FanEmail author
  • Jian-Min Chang
  • Jian-Zhang Li
  • Bi-Hua Xia
  • Zi-Tao Sang
Originals Originalarbeiten

Abstract

The cure properties of cure-accelerated phenol-urea-formaldehyde (PUF) resins with different catalysts [calcium oxide (CaO), sodium carbonate (Na2CO3), zinc oxide (ZnO), and magnesium oxide (MgO)] were investigated by gelation test and differential scanning calorimetry (DSC) analysis. The results indicated that catalysts such as Na2CO3, ZnO, and MgO were capable of increasing the curing rate and decreasing the curing temperature of PUF resins, however, the CaO inhibited the cure reaction. The formation of methylene bridges was considered to be the main reaction during curing. For the ZnO- and MgO-accelerated PUF resins, the addition reaction of formaldehyde with free phenolic site may act as subsidiary reaction. The activation energies (E a ) of cure-accelerated PUF resins other than CaO-acceleration were much lower than the control resin. The effects of catalysts and hot press temperature on adhesive performances of PUF resins were also discussed by plywood test. The PUF resins with Na2CO3, ZnO, and MgO had higher wet shear strength than the control resin. Hot press temperature had a strong influence on the wet shear strength as well as the catalysts. Among the catalysts, MgO had more significant improving effect on both the curing process and the wet shear strength of PUF resin.

Keywords

Differential Scanning Calorimetry Curve Oriented Strand Board Methylene Bridge Free Formaldehyde Adhesive Performance 
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.

Aushärtungseigenschaften und Klebstoffverhalten von Phenol-Harnstoff-Formaldehydharzen mit zugesetztem Härtungsbeschleuniger

Zusammenfassung

Mittels Geliertest und Differentialrasterkalorimetrie (DSC) wurden die Aushärtungseigenschaften von Phenol-Harnstoff-Formaldehydharzen (PUF), denen verschiedene Katalysatoren (Calciumoxid (CaO), Natriumcarbonat (Na2CO3), Zinkoxid (ZnO) und Magnesiumoxid (MgO)) als Härtungsbeschleuniger zugesetzt wurden, untersucht. Die Ergebnisse zeigten, dass die Katalysatoren Na2CO3, ZnO und MgO in der Lage sind, die Aushärtungsgeschwindigkeit zu erhöhen und die Aushärtungstemperatur von PUF Harzen zu senken, wohingegen CaO die Aushärtungsreaktion hemmte. Die Bildung von Methylenbrücken wurde als Hauptreaktion bei der Aushärtung angesehen. Bei den mit ZnO- und MgO beschleunigten PUF-Harzen kann die Anlagerung von Formaldehyd an die freien phenolischen OH-Gruppen eine Nebenreaktion darstellen. Die Aktivierungsenergien (E a ) von mit Härtungsbeschleunigern versetzen PUF-Harzen waren, außer bei CaO, viel niedriger als die des Kontrollharzes. Der Einfluss der Katalysatoren und der Heißpresstemperatur auf das Klebstoffverhalten von PUF-Harzen wurde auch an Sperrholz geprüft. PUF-Harze mit zugesetztem Na2CO3, ZnO und MgO wiesen eine höhere Nassscherfestigkeit als das Kontrollharz auf. Die Heißpresstemperatur hatte ebenfalls einen starken Einfluss auf die Nassscherfestigkeit. Unter allen Katalysatoren hatte MgO den größten positiven Einfluss auf sowohl das Aushärten als auch die Nassscherfestigkeit des PUF-Harzes.

Notes

Acknowledgements

The authors are very grateful for financial support from Chinese National Science and Technology planning (Project 2006BAD07A07-10).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Dong-Bin Fan
    • 1
    Email author
  • Jian-Min Chang
    • 1
  • Jian-Zhang Li
    • 1
  • Bi-Hua Xia
    • 1
  • Zi-Tao Sang
    • 1
  1. 1.College of Materials Science & TechnologyBeijing Forestry UniversityBeijing CityChina

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