以一种溶剂型膨胀钢结构防火涂料为例,使用酒精喷灯模拟火灾现场的高温环境,对防火涂料的膨胀倍数和耐火极限进行研究。采用热重/差热(TG-DTG)对涂料的热稳定性进行分析,采用红外光谱(FT-IR)、X射线衍射(XRD)、扫描电镜(SEM)等手段对炭层的组分、结构和形貌进行表征。结果表明:该涂料在耐火极限达到180℃时所需时间为110min,此时膨胀倍数为9.0。TG-DTG分析发现,防火涂料热稳定性良好;FT-IR分析暗示,炭层主要由—OH、—CH2、CC、C—O、Ti—O等构成;XRD分析说明炭层中形成的物质主要为TiO2与TiP2O7,SEM形貌观察发现,炭层呈“蜂窝状”结构。该涂料是一种性能优异的钢结构防火涂料。
Taking a solvent-borne intumescent fire-retardant coating of steel structure as an example,the expansion multiple and fire resistant limit of the coating were investigated by using alcohol blowtorch to simulate the high temperature environment of fire site.The thermal stability of the coating was analyzed by thermogravimetry (TG) and differential thermogravimetry (DTG).The structure,morphology and components of the residual char were characterized by using scanning electron microscope (SEM),X-rays diffraction (XRD),and fourier transform infrared spectrum (FT-IR).The results showed that when the fire resistant limit reached 180℃,the required time was 110min.At this case,the expansion multiple was 9.0.TG-DTA analysis found that the coating had good thermal stability.XRD analysis indicated that the residual char contained a certain amount of TiO2 and TiP2O7,and FT-IR analysis showed that the residual charis mainly composed of —OH,—CH2—,CO,P—C—O and Ti—O.The SEM morphology suggested that the char was formed a “honeycomb” structure.Overall,the coating was a kind of flame-retardant coating with excellent performance.
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