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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.
In order to investigate the mechanism of damp-heat aging of intumescent steel structure fire-retardant coating and the change law of fire-proof and heat-insulating properties of fire-retardant coating with the use time in wet and hot environment, the test results of insulation performance test were calculated and summarized, Infrared spectroscopy and carbonization layer structure scanning electron microscope were used to analyze the mechanism of damp-heat aging of two kinds of intumescent fire-retardant coatings, U-type and A-type.The results showed that the aging of the coating was caused by the coating of hydrophilic material Layer surface migration and precipitation; U-type, A-type coating of these two kinds of equivalent thermal conductivity with the aging time showed an overall trend of increase, and the increase with the coating of the matrix resin and flame retardant system components ; After 42 cycles of wet heat aging, the equivalent thermal conductivity of U-type coating increased by more than 50%, A-type coating equivalent thermal conductivity increased by more than 100%, while the thickness of the A-type coating its equivalent thermal conductivity The variation of coefficient is different.