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首页> 外文期刊>Journal of Photochemistry and Photobiology, B. Biology: Official Journal of the European Society for Photobiology >A comparative study on the artificial UV and natural ageing of beeswax and Chinese wax and influence of wax finishing on the ageing of Chinese Ash (Fraxinus mandshurica) wood surfaces
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A comparative study on the artificial UV and natural ageing of beeswax and Chinese wax and influence of wax finishing on the ageing of Chinese Ash (Fraxinus mandshurica) wood surfaces

机译：蜂蜡和中国蜡的人工紫外线和自然老化对比研究及蜡整理对中国灰（Frahinus Mandshurica）木材老化的影响

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摘要

This study investigated and compared the behaviour of two types of natural waxes, beeswax and Chinese wax, by means of two different ageing tests: an artificial accelerated ageing test using UV light and a simulated natural ageing test (indoors conditions) based on the action of natural, window-filtered light. The same tests were employed to evaluate the influence of wax finishing on the ageing behaviour of Chinese Ash (Fraxinus mandshurica) wood surfaces. Ageing effects were evaluated by direct and microscopic observation, colour measurements in the CIELab system and FTIR investigations. The results yielded by both accelerated UV ageing (72 h) and simulated indoors natural ageing (6 months) indicate that the waxes under analysis here are materials with a good ageing resistance. FTIR investigation revealed only minor chemical changes following ageing, more evident with beeswax than with Chinese wax. Finishing Chinese Ash wood surfaces with the two types of waxes influenced their ageing behaviour in terms of colour and surface chemistry changes. For both UV and natural ageing the maximum colour differences occurred for the samples finished with Chinese wax. The colour differences Delta E after 72 h accelerated UV ageing were in all the cases higher than those occurring after 6 months of indoors simulated natural ageing. Acceleration indexes for UV exposure compared to exposure to natural window-filtered sunlight, of about 40X-60X, were calculated. Both UV accelerated ageing and natural simulated ageing resulted in significant surface chemistry changes for the unfinished Chinese ash wood samples, consisting mostly in lignin degradation and formation of carbonyl containing chromophores. FTIR investigation of wax finish wood samples revealed only very minor chemical changes of the top wax layers, although chemical changes occurring beneath the coating layer on the wood surface are highly probable. Overall, the experiments presented in this paper indicate that Chinese wax seems slightly more resistant to ageing than beeswax.
机译：本研究通过两种不同的老化试验研究了两种类型的天然蜡，蜂蜡和中文蜡的行为：使用紫外线和基于“动作的人工加速老化试验和模拟的自然老化试验（室内条件）自然，窗户滤光。采用相同的试验来评估蜡精加工对中国灰（Fraxinus Mandshurica）木材表面的老化行为的影响。通过直接和显微镜观察，Cielab系统和FTIR调查的颜色测量来评估老化效果。加速UV老化（72小时）和模拟室内天然老化（6个月）所产生的结果表明，这里的蜡在这里是具有良好老化抗性的材料。 FTIR调查显示老龄化后的轻微化学变化，比蜂蜡比中国蜡更明显。用两种类型的蜡完成中国灰木表面，影响着颜色和表面化学变化的老化行为。对于紫外线和自然老化，样品用汉蜡完成了最大颜色差异。 72小时加速紫外线老化后的颜色差异δ在户内半模拟自然老化后6个月后的所有情况下都是高于那些。计算UV曝光的加速指标与暴露于自然窗口过滤的阳光，约为40x-60x的阳光相比。 UV加速老化和天然模拟老化均导致未完成的中国灰木样品的显着表面化学变化，主要由木质素降解和形成含羰基发色团的形成。蜡饰面木样品的FTIR调查仅显示了顶部蜡层的非常较小的化学变化，尽管木表面上的涂层下面发生的化学变化是高度可能的。总体而言，本文提出的实验表明，汉语蜡似乎比蜂蜡稍微耐老化。

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