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首页> 外文期刊>Pro Ligno >PENETRATION OF WOOD PRESERVATIVES INTO THERMALLY MODIFIED BIRCH AND PINE WOOD
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PENETRATION OF WOOD PRESERVATIVES INTO THERMALLY MODIFIED BIRCH AND PINE WOOD

机译：木材防腐剂渗透到热改性的桦木和松木中

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The objective of the present study was to investigate the interaction between Cu-containing preservatives and birch (Betula spp.) and pine (Pinus sylvestris L.) wood, modified at a relatively mild temperatures (150 – 180oC). The disposition of wood to absorb water was evaluated by capillary absorption (CA) tests through the specimens’ tangential and radial surface. Changes in wood drying characteristics due to thermal modification (TM) were evaluated by monitoring wood moisture dynamics after impregnation. In order to assess the capacity of wood to absorb preservatives, a vacuum/pressure process was used to impregnate small specimens for which uniform saturation into the entire volume can easily be reached. Quantitative determination of copper Cu content in the specimens was performed by using atomic absorption spectroscopy (AAS). The fixation of the absorbed Cu was evaluated by subjecting the specimens to leaching procedures according to EN 84 and assessing the ratio of retained Cu in the specimens. The CA test showed deceleration of capillary absorption in TM birch wood through both surfaces, with similar absorption rates regardless of treatment temperatures. A significant increase in the absorption rate through the tangential surface was recorded for TM pine wood and the increase was greater for specimens treated at higher temperatures. The results of moisture content monitoring showed a similar reduction in the drying rate due to thermal modification regardless of species. Comparing wood of one species with similar densities, less preservative was absorbed by TM wood. However, the results of AAS showed that, in comparison with unmodified wood, 10% (birch) and 25% (pine) more Cu per one gram of wood was introduced during impregnation. Nevertheless, TM also resulted in higher Cu leaching rates for both species.
机译：本研究的目的是研究在相对温和的温度（150 – 180oC）下改性的含铜防腐剂与桦木（Betula spp。）和松木（Pinus sylvestris L.）的相互作用。通过样品的切向和径向表面的毛细管吸收（CA）测试评估了木材吸收水的处置方式。通过监测浸渍后木材的水分动态来评估由于热改性（TM）而引起的木材干燥特性的变化。为了评估木材吸收防腐剂的能力，使用真空/压力过程浸渍小样本，对于这些小样本，很容易达到整个体积的均匀饱和度。使用原子吸收光谱法（AAS）进行样品中铜Cu含量的定量测定。根据EN 84，通过对样品进行浸提程序并评估样品中残留铜的比例，可以评估吸收的铜的固定性。 CA测试表明，TM桦木中的毛细吸收在两个表面上都减速，无论处理温度如何，吸收速率都相似。记录到TM松木通过切向表面的吸收速率显着增加，而在较高温度下处理的样品则增加得更大。水分含量监测的结果表明，由于热改性，与物种无关，干燥速率也有类似的降低。比较一种具有相似密度的木材，防腐剂被TM木材吸收的程度较低。但是，AAS的结果表明，与未改性的木材相比，浸渍过程中每1克木材引入了10％（桦木）和25％（松木）的铜。尽管如此，TM还导致两种物种的铜浸出率更高。

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