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首页> 外文会议>Twenty-Eighth International Conference - 2002 Athens Conference on Coatings Science and Technology, Jul 1-5, 2002, Vouliagmeni (Athens), Greece >Durability Prediction of p-Urethane Clearcoats
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Durability Prediction of p-Urethane Clearcoats

机译：对氨基甲酸乙酯清漆的耐久性预测

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摘要

The durability of topcoats is dependent on a large number of factors as polymer composition, stabilization package and the conditions during the weathering process. For obvious reasons prediction of the long-term (5-10 year) durability of coatings is very important. Some background information concerning the weathering process as well as methods to trace the degradation during exposure is given. The rate-determining factor for the degradation of PUR coatings is photo-oxidation. The photo-oxidation rate is controlled by the polymer structure but also stabilizers as HALS have a large influence. The prediction of the durability of clearcoats is based on tracing of the photo-oxidation rate and of the HALS longevity during exposure. The photo-oxidation rate is measured using FTIR-PAS. The HALS longevity is determined by ESR. The results show that degradation can be detected much earlier compared to methods as gloss loss and time-to-cracking. Moreover detection of differences between systems after short exposure times as wellas prediction of the long-term durability are possible. Service Life Prediction (SLP) of clearcoats based on these chemical analytical methods become more reliable as with the classical approach.
机译：面漆的耐久性取决于许多因素，例如聚合物组成，稳定化包装和风化过程中的条件。由于显而易见的原因，预测涂层的长期（5-10年）耐久性非常重要。给出了一些有关风化过程的背景信息以及跟踪暴露过程中降解的方法。 PUR涂层降解的决定因素是光氧化。光氧化速率受聚合物结构控制，但稳定剂也受HALS影响较大。对透明涂层耐久性的预测是基于曝光过程中光氧化速率和HALS寿命的追踪。使用FTIR-PAS测量光氧化速率。 HALS寿命由ESR确定。结果表明，与光泽损失和龟裂时间相比，可以更快地检测到降解。此外，在短时间曝光后检测系统之间的差异以及预测长期耐久性是可能的。与传统方法相比，基于这些化学分析方法的清漆的使用寿命预测（SLP）变得更加可靠。

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