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Fabrication of carbon black coated flexible polyurethane foam for significantly improved fire safety

机译：炭黑涂层的软质聚氨酯泡沫的制造可显着提高防火安全性

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摘要

Fire resistant coatings, composed of nanosized carbon black (CB) and polyurethane acrylate (PUA), were synthesized through a facile and low-cost method to improve the fire safety and thermal stability of flexible polyurethane foam (FPU). Scanning electron microscopy and total reflection Fourier transform infrared analysis results demonstrated the successful deposition of the coating on the surface of FPU foam and the morphology change of FPU with different concentrations of CB. Thermogravimetric analysis results revealed that the thermal stability of the coated FPU foams was significantly improved. The char residue of FPU/CB 8% was increased to 28.4% from 4.0 wt% of pure FPU. The coated FPU foam with a CB concentration of 8 wt% exhibited a great reduction of 80% in peak heat release rate (pHRR), attributing to the physical barrier effect of the CB filled coating. The observation of the char residue indicated that FPU/CB 4% exhibited the best shape char residue without collapse and cracking. Simultaneously, the SEM images of the char residues of the coated FPU foams showed that carbon black based coating promoted the generation of a compact char layer, suggesting a good physical blocking effect. Raman spectroscopy also confirmed that the graphitization degree of char residue FPU/CB 4% was the lowest, with the more stable structure. The coated FPU foam also has a certain inhibitory effect on the smoke release.
机译：通过一种简便，低成本的方法合成了由纳米炭黑（CB）和聚氨酯丙烯酸酯（PUA）组成的耐火涂料，以提高柔性聚氨酯泡沫（FPU）的防火安全性和热稳定性。扫描电子显微镜和全反射傅立叶变换红外分析结果表明，涂​​层在FPU泡沫表面的成功沉积以及不同CB浓度下FPU的形态变化。热重分析结果表明，涂​​覆的FPU泡沫的热稳定性得到显着改善。 FPU / CB 8％的残炭从纯FPU的4.0 wt％增加到28.4％。 CB浓度为8 wt％的FPU泡沫涂层的峰值放热率（pHRR）降低了80％，这归因于CB填充涂层的物理屏障作用。观察到的焦炭残留物表明FPU / CB 4％表现出最佳形状的焦炭残留物，没有塌陷和开裂。同时，经涂覆的FPU泡沫的炭残留物的SEM图像显示，基于炭黑的涂料促进了致密炭层的产生，表明了良好的物理阻断效果。拉曼光谱法还证实，焦炭残留物FPU / CB 4％的石墨化程度最低，结构更稳定。涂覆的FPU泡沫对烟气的释放也具有一定的抑制作用。

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