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首页> 外文期刊>Journal of Applied Polymer Science >Automotive Clearcoat Damage Due to Oviposition of Dragonflies
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Automotive Clearcoat Damage Due to Oviposition of Dragonflies

机译：蜻蜓的产卵对汽车透明涂层的损害

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摘要

Automotive industries are increasingly interested in learning how to prolong the clearcoat resin lifetime and avoid its thermal, photochemical,and chemical degradation.While chemical degradation by acid rain has been well known since the beginning of the decade and the subject of many studies, chemical degradation of the automotive clearcoat by living organisms (except by bird droppings)is a newly recognized problem.In this work, we report the chemical degradation of the automotive clearcoat caused by oviposition of dragonflies.These insects,very common in Brazil,are attracted by the reflecting surface of cars exposed in the sun and lay eggs on them.We observed that the eggs, at the high temperatures (50-92deg C) of the car surface, can cause damage similar to that of acid rain.In experiments on resin-coated plates, we excluded the involvement of H_2O_2-or hydroquinone-derived radicals,of enzyme-catalyzed hudrolysis, and of photosensitizer-induced damage.The damage was very similar,however,to that produced by the sulfur-containing amino acids, cysteine and cystine, at high temperature.Due to this similarity, and because the eggs are rich in sulfur amino acids,we propose a mechanism involving cysteine and cystine residues in the clearcoat damage.
机译：汽车行业对学习如何延长透明涂料树脂寿命并避免其热降解，光化学降解和化学降解越来越感兴趣。尽管自从本世纪初开始，酸雨引起的化学降解一直是众所周知的，许多研究的主题是化学降解活生物体（鸟类粪便除外）对汽车清漆的保护是一个新发现的问题。在这项工作中，我们报告了蜻蜓产卵引起的汽车清漆的化学降解。这些昆虫在巴西很常见，被昆虫吸引。在阳光下反射汽车表面并在上面产卵。我们观察到，鸡蛋在汽车表面的高温（50-92摄氏度）下会造成类似于酸雨的破坏。涂层板中，我们排除了H_2O_2或对苯二酚衍生的基团，酶催化的湿解和光敏剂引起的损伤的参与。损伤非常相似，如何由于这种相似性，并且由于鸡蛋中富含硫氨基酸，因此我们提出了一种机制，该机制涉及清漆中的半胱氨酸和半胱氨酸残基受损，这是由于在高温下含硫氨基酸半胱氨酸和胱氨酸所产生的。 。

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