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首页> 外文期刊>Applied Surface Science >Inorganic UV absorbers for the photostabilisation of wood-clearcoating systems: Comparison with organic UV absorbers
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Inorganic UV absorbers for the photostabilisation of wood-clearcoating systems: Comparison with organic UV absorbers

机译：用于木材透明涂料体系光稳定的无机紫外线吸收剂：与有机紫外线吸收剂的比较

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Inorganic UV absorbers which are widely used today were originally designed neither as a UV blocker in coatings applications, nor for wood protection. In recent years however, there has been extensive interest in these compounds, especially with regard to their properties as a UV blocker in coating applications. In this work, we carried out a comparative study to look into some inorganic and organic UV absorbers used in wood coating applications. The aim of this study is to determine the photostabilisation performances of each type of UV absorbers, to seek possible synergies and the influences of different wood species. We have also searched to find eventual correlation between these performances and the influence of UV absorbers on the film properties. Our study has compared the performances of the following UV absorbers: hombitec RM 300, hombitec RM 400 from the Sachtleben Company; transparent yellow and red iron oxides from Sayerlack as inorganic UV absorbers; organic UV absorbers Tinuvin 1130 and Tinuvin 5151 from Ciba Company. The study was carried out on three wood species: Abies grandis, tauari and European oak. The environmental constraints (in particular the limitation of the emission of volatile organic compounds VOCs) directed our choice towards aqueous formulations marketed by the Sayerlack Arch Coatings Company. The results obtained after 800 h of dry ageing showed that the Tinuvins and the hombitecs present better wood photostabilisations. On the other hand in wet ageing, with the hombitec, there are appearances of some cracks and an increase in the roughness of the surface. This phenomenon is absent when the Tinuvins are used. With regard to these results, the thermomechanical analyses relating to the follow-up of the change of the glass transition temperature (T_g) of the various coating systems, show a different behaviour between the two types of absorbers. However, contrary to organic UV absorbers, inorganic ones tend to increase T_g during ageing, and, consequently decrease the flexibility of films. These phenomena can lead to the appearance of cracks found in the case of the wet weathering.
机译：当今广泛使用的无机紫外线吸收剂最初既不是设计用于涂料应用中的紫外线阻断剂，也不是用于木材保护。然而，近年来，这些化合物引起了广泛的兴趣，特别是在涂料应用中作为紫外线阻隔剂的性能方面。在这项工作中，我们进行了比较研究，以研究用于木材涂料应用的一些无机和有机紫外线吸收剂。这项研究的目的是确定每种类型的紫外线吸收剂的光稳定性能，以寻求可能的协同作用以及不同木材种类的影响。我们还进行了搜索以发现这些性能与紫外线吸收剂对薄膜性能的影响之间的最终相关性。我们的研究比较了以下紫外线吸收剂的性能：Sachtleben公司的hombitec RM 300，hombitec RM 400；来自Sayerlack的透明黄色和红色氧化铁，用作无机紫外线吸收剂； Ciba Company的有机紫外线吸收剂Tinuvin 1130和Tinuvin 5151。这项研究是针对三种木种进行的：大冷杉，牛磺酸和欧洲橡木。环境限制（特别是挥发性有机化合物VOC排放的限制）使我们选择了Sayerlack Arch Coatings Company销售的水性制剂。干燥老化800小时后获得的结果表明，丁香类和同型生物具有更好的木材光稳定性。另一方面，在使用hombitec的湿法时效中，会出现一些裂纹并且表面粗糙度增加。使用Tinuvins时不存在这种现象。关于这些结果，与后续各种涂层系统的玻璃化转变温度（T_g）的变化有关的热机械分析表明，两种类型的吸收器之间的行为不同。但是，与有机紫外线吸收剂相反，无机紫外线吸收剂会在老化过程中增加T_g，从而降低薄膜的柔韧性。这些现象会导致在潮湿风化的情况下出现裂缝。

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