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A mechanistic study of degradation of a typical automotive clearcoat caused by bird droppings

机译：由鸟粪引起的典型汽车清漆降解的机理研究

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摘要

This study aims at investigating the degradation mechanism of an automotive clearcoat caused by bird droppings. Natural bird droppings and their synthetic equivalent (pancreatin) were utilized for this purpose. The presence of highly-etched areas on the surface of coatings and structural variations of clearcoat after being attacked by these materials corresponded to a catalyzed hydrolytic degradation. This finding was obtained using different analytical techniques. Based on these studies, three possible hypotheses were presented, including acid catalysis, metal ion catalysis, and enzymatic catalysis. The conditions required for the occurrence of each hypothesis were discussed. It was found that acid and metal ions have a weak contribution to catalyze the hydrolysis reaction of clearcoat, whereas enzymes existing in bird droppings were mainly responsible for this hydrolytic degradation.
机译：这项研究旨在调查由鸟粪引起的汽车清漆的降解机理。天然鸟类粪便及其合成等价物（胰酶）被用于此目的。涂层表面上高蚀刻区的存在和透明涂层的结构变化在被这些材料侵蚀后对应于催化的水解降解。这一发现是使用不同的分析技术获得的。基于这些研究，提出了三种可能的假设，包括酸催化，金属离子催化和酶催化。讨论了每个假设发生的条件。发现酸和金属离子对催化透明涂层的水解反应的贡献较小，而鸟粪中存在的酶则主要负责这种水解降解。

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  • 来源
    《JCT》 |2011年第1期|p.83-95|共13页
  • 作者

    Hossein Yari; Mohsen Mohseni; Bahrain Ramezanzadeh;

  • 作者单位

    Polymer Engineering and Color Technology Department,Amirkabir University of Technology, P.O. Box 15875-4413,Tehran, Iran;

    Polymer Engineering and Color Technology Department,Amirkabir University of Technology, P.O. Box 15875-4413,Tehran, Iran;

    Polymer Engineering and Color Technology Department,Amirkabir University of Technology, P.O. Box 15875-4413,Tehran, Iran;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    enzymatic degradation; bird droppings; automotive coating; hydrolysis; pancreatin;

    机译：酶促降解;鸟粪汽车涂料;水解;胰酶;

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