Effect of coatings on ACQ preservative component distribution and solubility after natural weathering exposure |
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| Authors: | Mojgan Nejad Tony Ung Paul Cooper |
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| Institution: | 1. Faculty of Forestry, University of Toronto, 33 Willcocks St., Toronto, ON, M5S 3B3, Canada
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| Abstract: | Copper and quaternary ammonium compound distributions across lumber and amounts of available or soluble components were measured in coated and uncoated alkaline copper quat-treated southern pine lumber. Lumber that was not exposed to weathering had slightly higher copper retention near the surface and a steeper quat gradient. After 3?years of natural weathering, copper and quat leachings were significantly reduced by the coatings and leaching rates were low, even though the coatings were failing. The amounts of soluble copper were significantly reduced after weathering, even after accounting for the copper leached during the exposure. The relative amount of soluble monoethanolamine (Mea) remaining after weathering was low compared with copper. This reduction in soluble amine in the wood was most likely responsible for the reduced amounts of available copper. The reduced quat leaching from coated samples is attributed to the extended effectiveness of the coatings in the earlywood. |
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