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首页> 外文期刊>Surface Coatings International, Part B. Coatings Transactions: The Science and Technology of Paints, Inks and Related Coatings and their Raw Materials >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分布

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The depth profile of weathering effects on wood was studied after the laboratory ultraviolet exposure of fir-wood.The 'thin strip' method (ie 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 that had been impregnated with chromium (VI) trioxide or Fe(lll) nitrate,or protected with free films of clear stain with photo-stabilisers and without photostabilisers.It has been shown that ultraviolet (UV) light penetrates the fir-wood surface to a depth greater than 70pm,resulting in changes in the tensile strength of the fir-wood strips to a depth of 70 to 140pm.Strength changes in lower levels (down to 280pm from the surface) could not be clearly attributed to a 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 a UV absorber (Tin-uvin 1130,Ciba) and a hindered amine light stabiliser (HALS compound type) (Tinuvin 292,Ciba),was shown to offer the best protection of the treatments studied.Impregnation with aqueous solutions of chromium (VI) trioxide and Fe(lll) nitrate proved ineffective in photostabilising the wood surface.
机译：在实验室对杉木进行紫外线照射后，研究了风化作用对木材的深度分布。对“薄条”方法（即切片木切片的拉伸性能变化的测量）进行了改进，以分批暴露捆扎成束并在QUV装置中暴露。未处理的条带束暴露，被三氧化铬（VI）或硝酸铁（III）浸渍的表面条带覆盖，或被具有光敏性的透明污渍薄膜保护稳定剂且没有光稳定剂。已证明紫外线（UV）穿透杉木表面的深度大于70pm，导致杉木条的拉伸强度变化至70至140pm的深度。较低水平（从地面下降至280pm）的变化不能明确归因于紫外线的主要作用，并且很可能是受水解过程控制的。暴露100小时可以使有效成分几种清晰可见的污渍富含紫外线吸收剂（Tin-uvin 1130，Ciba）和受阻胺光稳定剂（HALS复合型）（Tinuvin 292，Ciba），显示出最佳的保护作用。用三氧化铬（VI）和硝酸铁（III）水溶液浸渍证明对木材表面的光稳定作用无效。

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