纳米SiO_(2)对膨胀型防火涂料的紫外老化影响研究

Study on the effect of nano-silica on the ultraviolet aging of intumescent fireproof coatings

为了研究纳米SiO_(2)对膨胀型防火涂料的耐紫外线性能的影响,对膨胀型防火涂料KB(不添加纳米SiO_(2))、SY-1(1%纳米SiO_(2))、SY-2(2%纳米SiO_(2))和SY-3(3%纳米SiO_(2))进行了人工紫外加速老化实验,并利用锥形量热仪、扫描电镜、热重分析仪和傅里叶红外光谱分析仪对样品的理化性能进行了分析。结果表明:添加纳米SiO_(2)提高了膨胀型防火涂料的防火性能和耐紫外线性能,并且添加2%纳米SiO_(2)的效果最明显。从对SY-2和KB的老化机理分析发现,纳米SiO_(2)提高膨胀型防火涂料的热稳定性及耐紫外线性能,主要是通过促进树脂与聚磷酸铵交联,抑制酰胺形成,与季戊四醇形成交联结构完成。

The effect of nano-silica on the UV resistance of intumescent fire-retardant coatings were studied.Artificial ultraviolet accelerated aging experiments were carried out on the intumescent fireproof coating KB(no nano-SiO_(2) added),SY-1(1%nano-SiO_(2)),SY-2(2%nano-SiO_(2))and SY-3(3%nano-SiO_(2)).The physical and chemical properties of the samples were analyzed using cone calorimeter,scanning electron microscope,thermogravimetric analyzer and Fourier infrared spectrometer.The results showed that the addition of nano-SiO_(2) improved the fire resistance and ultraviolet resistance of intumescent fire-retardant coatings,and the effected of adding 2%nano-SiO_(2) was the most obvious.From the analysis of the aging mechanism of SY-2 and KB,it is found that nano-SiO_(2) can improve the thermal stability and UV resistance of intumescent fireproof coatings,mainly by promoting the cross-linking of the resin with ammonium polyphosphate,inhibiting the formation of amide,and forming cross-linking with pentaerythritol.