一体化膨胀型防火涂料的热解机理研究

为解决传统防火涂料的装饰性问题,设计并合成了一种一体化膨胀型防火涂料.采用热红联用技术对该防火涂料的热解行为进行了研究,发现其热解过程可以分为4个阶段:第1阶段后期,炭化反应开始;第2阶段不稳定磷酸酯结构的断裂释放出CO2等气体,使熔融炭化物发生初步膨胀;第3阶段气体产物使炭化层进一步膨胀,最后硬化形成多孔炭化层;最终阶段炭化层高温热解.研究发现该防火涂料的热解反应发生顺序符合膨胀防火体系的要求,可以顺利地形成具有多孔结构的炭化层来保护基材.

Thermal decomposition of an intrinsic intumescent fire resistant coating

As traditional fire resistant coating systems are not transparent, an intrinsic intumescent fire resistant coating was designed and synthesized. Its thermal decomposition behavior was studied by means of thermo gravimetric analysis/infrared spectrometry coupling technique. The results showed that its decomposition process could be divided into four steps. In the end of the first step, charring began; in the next step, CO₂ was released by scission of P-O-C linkages and a reactive intumescent char layer was formed; on further heating to the third step, a further intumescing process happened and then the char structures solidified; in the final step, the dominant reactions were destruction of char structures. The decomposition sequence of this intumescent fire resistant coating was proper for a good intumescent process.