Influence of wood species, treatment method and biocides concentration on leaching of copper–ethanolamine preservatives

Humar, Miha; Žlindra, Daniel; Pohleven, Franc

doi:10.1016/j.buildenv.2005.09.023

Cited by 28 publications

(9 citation statements)

References 10 publications

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“…Because greater void volume develops after kiln drying the retention was higher in the dried specimens compared to the green ones, and the difference was significant (t 05.49). Similar results have also been reported by several authors (Kumar and Morrell 1989, Humara et al 2007, Humar and Zlindra 2007, Islam 2008. Copper retention and penetration per group of specimens is shown in Figure 4 and was done after re-drying of specimens.…”

Section: Retention and Penetrationsupporting

confidence: 79%

Effect of steam injection re-drying of Japanese cedar on preservative leaching after passive impregnation

Ando

Islam

Yamauchi

et al. 2012

Wood Material Science & Engineering

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This study investigated the effects of steam injection re-drying on the leaching of copper azole type B (CAz-B) preservative from green and kiln dried Japanese cedar (Cryptomeria japonica (L.f.) D.Don) lumber treated by the passive impregnation method. The leaching and fungal treatments were performed according to the JIS Z 2101-1994 standard. Sixteen hours of steam injection re-drying reduced the moisture content from 152 to 82% and 195 to 55% for initially green and dry lumber, respectively. Preservative retention was higher in the dry lumber (5.21 kg/m 3 ) compared with the green (4.66 kg/m 3 ), however, leaching percent was similar for both types. Preservative leaching and mass loss due to fungal attack were significantly lower in the lumber re-dried by steam injection compared with air dried. Thus, steam injection re-drying after passive impregnation treatment could be a step toward fixing CAz-B preservative in Japanese cedar lumber.

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Section: Retention and Penetrationsupporting

confidence: 79%

Effect of steam injection re-drying of Japanese cedar on preservative leaching after passive impregnation

Ando

Islam

Yamauchi

et al. 2012

Wood Material Science & Engineering

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“…It is believed that this is predominantly due to the depolymerisation of wood caused by excess of ethanolamine. Humar et al (2007) reported that it was limited for the amount of the functional group in wood which can react with the copper/ethanolamine complex, in addition during reaction of ethanolamine with wood or its components, free radicals were formed which will cause depolymerisation of lignin (Humar et al 2003). Further research also indicated that ethanolamine in copper based wood preservatives in the first place enables copper fixation.…”

Section: Physical and Mechanical Properties Of Lumbermentioning

confidence: 99%

Effects of ACQ preservative treatment on the mechanical properties of hardwood glulam

et al. 2011

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The purpose of this study is to examine the mechanical properties of ACQ-treated glulam made from three hardwood lumbers. Two nondestructive methods, ultrasonic wave and tap tone method, were also used in this study. The results showed that the dynamic MOE and static MOE of lumbers decreased with increased ACQ preservative retention. ANOVA showed no significant difference in the MOE values of glulam between untreated and ACQ-treated group. However, it was also found that glulam made from red oak lumbers had the highest bending strength retention ratio. The shear strength of the glulam also showed similar results. Finally, no delaminating was found in all glulams after the specimens under soaked and boiled delamination tests. Einflüsse einer ACQ-Imprägnierung auf die mechanischen Eigenschaften von Brettschichtholz aus verschiedenen LaubhölzernZusammenfassung In dieser Studie werden die mechanischen Eigenschaften von mit ACQ behandeltem Brettschichtholz aus drei verschiedenen Laubholzarten untersucht. Dabei wurden auch zwei zerstörungsfreie Methoden, nämlich Ultraschall-und Längsschwingungsmessung, verwendet. Die Ergebnisse zeigten, dass der dynamische und der statische Elastizitätsmodul (MOE) von Schnittholz mit zunehmender ACQ-Schutzmittelaufnahme abnahmen. Die ANOVA-Analyse ergab keine signifikanten Unterschiede

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“…Addition of other co-biocides and octanoic acid into the preservative solution resulted in slightly reduced copper leaching: approximately 10% lower leaching rates were determined at specimens, impregnated with CuEQ (6·7%). We presume that the main reasons for the observed difference originate in hydrophobic effect of octanoic acid and new less soluble complexes between copper, ethanolamine, quaternary ammonium compound and octanoic acid, formed in the treated wood (Humar et al 2007). However, it has to be considered that retentions of preservative solutions were relatively high.…”

Section: Pretreatmentmentioning

confidence: 95%

“…However, it has to be considered that retentions of preservative solutions were relatively high. Lower retentions generally result in lower leaching rates (Humar et al 2007). Surface coatings significantly decreased leaching of copper from the impregnated wood.…”

Section: Pretreatmentmentioning

confidence: 99%

Performance of waterborne acrylic surface coatings on wood impregnated with Cu-ethanolamine preservatives

et al. 2011

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Two waterborne acrylic coatings were applied on spruce wood, impregnated with two copperethanolamine containing preservatives (CuE and CuEQ), one of them (CuEQ) containing a boron compound, octanoic acid and a quaternary ammonium compound as additives. Lower contact angles and deeper penetration of both coating types were observed on CuEQ treated, compared to untreated or CuE-treated wood. Improved adhesion of coatings on CuEQ impregnated wood was exhibited as well. In general, characteristics of surface finishes on copper-ethanolamine treated wood were comparable to untreated wood. It was also shown that copper leaching from the preserved wood was significantly reduced by application of the surface finishes.

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Influence of wood species, treatment method and biocides concentration on leaching of copper–ethanolamine preservatives

Cited by 28 publications

References 10 publications

Effect of steam injection re-drying of Japanese cedar on preservative leaching after passive impregnation

Effect of steam injection re-drying of Japanese cedar on preservative leaching after passive impregnation

Effects of ACQ preservative treatment on the mechanical properties of hardwood glulam

Performance of waterborne acrylic surface coatings on wood impregnated with Cu-ethanolamine preservatives

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