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Changes in dimensional stability and mechanical properties of Eucalyptus pellita by melamine–urea–formaldehyde resin impregnation and heat treatment

Änderungen der Dimensionsstabilität und der mechanischen Eigenschaften von Eucalyptus pellita durch Imprägnierung mit Melaminharnstoffharz und thermischer Modifikation

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Abstract

This study investigated the influence of heat treatment on the dimensional stability and mechanical properties of untreated and low molecular weight melamine–urea–formaldehyde (MUF) resin treated Eucalyptus pellita wood. Wood samples were heat treated under vacuum atmosphere in laboratory conditions at temperatures between 160 and 240 °C for 2–10 h. The results showed that anti-shrink efficiency and anti-swelling efficiency of MUF resin-impregnated heat-treated eucalypt wood were improved by up to 47 and 49 % at 240 °C for 10 h separately, which were greater than those of heat-treated wood. In relation to mechanical properties, the modulus of elasticity and modulus of rupture decreased with increasing temperature and time, but the reduction of properties appeared to be smaller for MUF resin-impregnated heat-treated wood. Therefore, heat treatment combined with resin treatment of eucalypt wood shows potential to improve the wood quality of solid wood products.

Zusammenfassung

In dieser Studie wurde der Einfluss einer thermischen Behandlung auf die Dimensionsstabilität und die mechanischen Eigenschaften von unbehandeltem sowie mit niedermolekularem Melaminharnstoffharz (MUF) modifiziertem Eucalyptus pellita Holz untersucht. Prüfkörper wurden unter Laborbedingungen in Vakuumatmosphäre bei Temperaturen zwischen 160–240 °C für eine Dauer von 2 bis 10 Stunden thermisch behandelt. Die Ergebnisse zeigten, dass die Schwindungsvergütung von mit MUF imprägniertem und bei einer Temperatur von 240 °C über 10 Stunden thermisch behandeltem Eukalyptusholz um bis zu 47 % und die Quellungsvergütung um bis zu 49 % verbessert wurden. Die Ergebnisse waren besser als bei nur thermisch behandeltem Holz. Der Elastizitätsmodul und die Biegefestigkeit nahmen mit steigender Temperatur und Behandlungsdauer ab. Diese Abnahme war jedoch bei mit MUF imprägniertem und thermisch behandeltem Holz geringer. Dies zeigt, dass eine thermische Behandlung in Kombination mit einer Harzimprägnierung von Eukalyptusholz eine Möglichkeit ist, die Holzqualität von Massivholzprodukten zu verbessern.

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Acknowledgments

The authors acknowledge the financial support from the 15th National Scientific and Technological Support Project of China (2006BAD19B0704).

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Authors and Affiliations

  1. Research Institute of Wood Industry, Chinese Academy of Forestry, 100091, Beijing, People’s Republic of China

    Bailing Sun & Junliang Liu

  2. Research Associate International Centre for Bamboo and Rattan Beijing, Beijing, 100102, People’s Republic of China

    Xuehua Wang

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  1. Bailing Sun
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  2. Xuehua Wang
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Correspondence to Junliang Liu.

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Sun, B., Wang, X. & Liu, J. Changes in dimensional stability and mechanical properties of Eucalyptus pellita by melamine–urea–formaldehyde resin impregnation and heat treatment. Eur. J. Wood Prod. 71, 557–562 (2013). https://doi.org/10.1007/s00107-013-0700-9

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