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首页> 外文会议>Conference on Woodcoatings: Foundations for the Future Oct 28-30, 2002 The Hague, The Netherlands >Depth Profile of UV-induced Wood Surface Degradation
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Depth Profile of UV-induced Wood Surface Degradation

机译：紫外线引起的木材表面降解的深度剖面

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摘要

The depth profile of weathering effects on wood was studied after laboratory ultraviolet exposure of fir-wood. The "Thin strip" method i.e. the measurement of changes in tensile properties of microtomed wood sections, was modified in terms of exposure of batches of strips packed in bundles and exposed in a QUV apparatus. The bundles of strips were exposed untreated, covered with surface strips impregnated with chromium trioxide or ferric nitrate, or protected with free films of clear stain with and without photostabilisers. It has been shown that UV light penetrated the wood surface deeper than 70 μm, resulting in changes in tensile strength of strips to a depth of 70 to 140 μm. Strength changes in lower levels (down to 280μm from the surface) could not be clearly attributed to the predominant effect of UV light, and were probably controlled by hydrolytic processes. 100 hours of exposure enabled the effectiveness of several treatments to be established. The clear stain enriched with UV absorber and HALS compound type was shown to offer the best protection. Impregnation with aqueous solutions of chromium (Ⅵ) trioxide and ferric nitrate proved ineffective in photostabilising the wood surface.
机译：在实验室用紫外线照射杉木后，研究了风化作用对木材的深度分布。 “薄条”方法，即切片的木材切片的拉伸性能变化的测量，在成批捆扎成捆并在QUV装置中暴露的条带的暴露方面进行了修改。这些带束未经处理就暴露在外，用浸有三氧化铬或硝酸铁的表面带覆盖，或用有和没有光稳定剂的透明污渍自由膜保护。已经显示，紫外线穿透木材表面的深度超过70μm，从而导致条的拉伸强度变化到70至140μm的深度。较低水平（距离表面低至280μm）的强度变化不能清楚地归因于紫外线的主要作用，并且很可能受水解过程控制。暴露100小时可以确定几种治疗的有效性。显示出富含紫外线吸收剂和HALS化合物类型的透明污渍可提供最佳保护。用三氧化铬（Ⅵ）和硝酸铁的水溶液浸渍证明不能有效地稳定木材表面。

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