Durability evaluation of building sealants by accelerated weathering and thermal analysis
Durability evaluation of building sealants by accelerated weathering and thermal analysis
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通过加速风化和热分析评估建筑密封胶的耐久性
DOI：
10.1016/j.conbuildmat.2005.06.026
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发表时间：
2006
影响因子：
7.4
通讯作者：
D. Liu
中科院分区：
文献类型：
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作者：
S. Ding;D. Liu
本文对有机硅和聚氨酯两种建筑密封胶分别进行了热暴露（80°C）和UVA紫外线辐射（300 W）加速老化试验。提出了一种定量评价密封胶对不同气候条件敏感性和密封胶耐久性的指标--偏差系数。研究表明，要使密封胶的性能发生明显的变化，老化时间至少应在5000小时以上。研究还证明了不同的风化条件对密封胶的性能和结构有着完全不同的影响，热重和差示扫描量热法可以验证其老化机理。
Accelerated weathering tests, exposure to heat (80°C) and UVA ultraviolet radiation (300W), were carried out respectively on two selected building sealants, silicone and polyurethane, in this paper. A quantificational term, deviation coefficient, was proposed to rationally evaluate the sensitivity of sealants to the different weathering conditions and sealants’ durability. The study has shown that the weathering period should be at least 5000h in order to let distinct change on sealants’ property occur. The study has also proved that different weathering conditions have completely different influences on the properties and structures of sealants, and thermogravimetry and differential scanning calorimetry could verify their ageing mechanisms.
ASTM 特别技术出版物。
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