| 摘要: |
| 为考察膨胀型钢结构防火涂层的湿热老化机理及在湿热环境下防火涂层防火隔热性能随使用时间的变化规律，对隔热性能试验的试验结果进行了计算和总结，并通过傅里叶红外光谱检测和炭化层结构的扫描电镜对U型、A型这2种膨胀型钢结构防火涂料进行了湿热老化机理分析.结果表明：涂层发生老化是由于涂层内的亲水性物质向涂层表面迁移和析出；U型、A型这2种涂层的等效导热系数随老化时间延长总体上均呈现出增大的趋势，且增幅与涂料的基体树脂和阻燃体系的组分有关；经过42次湿热老化循环后，U型涂层等效导热系数增加了50%以上，A型涂层等效导热系数的增幅超过了100%，而厚度不同的A型涂层其等效导热系数的变化规律有所区别. |
| 关键词: 膨胀型钢结构防火涂层 湿热老化 隔热性能 等效导热系数 |
| DOI：10.3969/j.issn.10079629.2012.01.016 |
| 分类号: |
| 基金项目:国家自然科学基金海外或港、澳青年学者合作研究基金资助项目（50728805） |
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| Theoretical Analysis of Hydrothermal Property of Intumescent Coating for Steel Elements |
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| Abstract: |
| In order to investigate the aging mechanism and degradation process of intumescnet coating, the results of fire tests are reported. FTIR tests and SEM tests were conducted on the intumescent coating after hydrothermal aging tests. Results of the degradation mechanism study reveal that the hydrophilic components in intumescent coating move to the surface of the coating and can be dissolved by moisture in the air. Compared to specimens without hydrothermal aging tests, after 42 cycles of hydrothermal aging(to simulate 20 years of exposure to an assumed exposure environment), the effective thermal conductivity of type U intumescent coating is 50% higher and that of type A intumescent coating is 100% higher than fresh coating. |
| Key words: intumescent coating for steel element hydrothermal aging fire protection property effective thermal conductivity |
