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Coatings To Reduce Wood Preservative Leaching

机译：减少木材防腐剂浸出的涂料

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The efficiency of semitransparent penetrating stains to reduce leaching of wood preservative components was evaluated. Five commercial wood deck finishes were applied to untreated and chromated copper arsenate (CCA), alkaline copper quat (ACQ), and copper azole (CA) treated wood, and leachates were collected and analyzed during 3 years of natural weathering exposure in Toronto, Canada. All stains evaluated effectively reduced the cumulative leaching of all inorganic preservative components by about 60% on average. Although most coatings showed significant film degradation starting around 12 months, the reduced leaching persisted even after 3 years. This suggests that temporary protection of wood with a coating during the early stages of use resulted in long-term reduction in preservative leaching potential. A two-week screening leaching test was able to predict the long-term leaching performance of different coatings reasonably well. Cured coating glass transition temperature (Tg) and liquid coating viscosity were the most important variables affecting a leaching prediction model. To effecttvety reduce leaching of preservative components from treated wood, coatings should have Tg low enough to withstand stresses caused by freezing in winter and have adequate viscosity to form a barrier film layer on the wood surface.
机译：评估了半透明渗透性污渍减少木材防腐剂成分浸出的效率。在未经处理和铬酸盐的砷化铜（CCA），碱式铜季铵盐（ACQ）和铜唑（CA）处理的木材上使用了五种商用木甲板面漆，并在加拿大多伦多进行了3年自然风化暴露期间收集并分析了渗滤液。所有评估的污渍均有效地平均降低了所有无机防腐剂成分的累积浸出量约60％。尽管大多数涂料在12个月左右开始出现明显的薄膜降解，但减少的浸出甚至在3年后仍然持续。这表明在使用的早期阶段用涂层对木材进行临时保护会导致防腐剂浸出潜力的长期降低。为期两周的筛选浸出试验能够很好地预测不同涂料的长期浸出性能。固化的涂料玻璃化转变温度（Tg）和液体涂料粘度是影响浸出预测模型的最重要变量。为了有效地减少防腐剂成分从处理过的木材中的浸出，涂料的Tg应该足够低，以承受冬季冰冻引起的应力，并具有足够的粘度以在木材表面形成阻挡膜层。

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  • 来源
    《Environmental Science & Technology》 |2010年第16期|p.6162-6166|共5页
  • 作者

    MOJGAN NEJAD; PAUL COOPER;

  • 作者单位

    University of Toronto, 33 Willcocks State, Toronto,Ontario M5S 3B3, Canada;

    rnUniversity of Toronto, 33 Willcocks State, Toronto,Ontario M5S 3B3, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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