Abstract Ultra-fine dry chemicals, as an effective fire suppressant, may have higher fire extinguishing efficiency and the ability to inhibit pool fires re-ignition after oil-repellent treatment. Thus, we used two surfactants, i.e. POTS (1H,1H,2H,2H-perfluorooctyltrimethoxysilane) and OBS (Sodium perfluorononyloxybenzenesulfonate) to modify fine sodium bicarbonate and studied the effect of POTS/OBS compound ratios on powders oil-repellency. SEM images revealed the structures of the modified powders, and XPS confirmed that the modifiers were successfully grafted on the surface of powders. The fire extinguishing experiments showed that the dry chemicals after modified would have higher fire extinguishing efficiencies, especially after OBS added. Furthermore, the isolation layer formed by modified powders was observed on the fuel surface after fire extinguishing, which would effectively inhibit the re-ignition of aviation kerosene.

中文翻译：

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POTS/OBS改性超细干粉扑灭航空煤油池火灾的应用

摘要 超细干粉作为一种有效的灭火剂，在经过疏油处理后可能具有更高的灭火效率和抑制池火复燃的能力。因此，我们使用两种表面活性剂，即POTS（1H,1H,2H,2H-全氟辛基三甲氧基硅烷）和OBS（全氟壬基氧基苯磺酸钠）对细粒碳酸氢钠进行改性，并研究了POTS/OBS配比对粉末拒油性的影响。SEM 图像揭示了改性粉末的结构，XPS 证实改性剂成功接枝到粉末表面。灭火实验表明，改性后的干粉灭火效率更高，尤其是添加OBS后。此外，