Bitumen produces a lot of harmful gaseous products and heat at high temperature, endangering human health and ecological environments. To develop an efficient compound flame retardant (FR) for suppressing thermal decomposition and volatile release of bitumen, the suppressing effects of matched halogen-free FR for each bituminous component was first discussed, and then a compositional formulation was proposed to develop a new compound FR for bitumen, suppressing bituminous thermal decomposition and volatile release. Results indicated that the matched FR inhibited endothermic and exothermic reactions, lowered the thermal decomposition rate, and retarded the whole thermal decomposition progress of each component. Also, the dynamic release process of emitted volatiles from each component was suppressed by the selected FR. The release amount of main volatiles was decreased, but CO₂ and H₂O were still main gaseous products from each bituminous component. Additionally, the superimposed and voidless barrier layer was generated owing to the synergic effects of matched FRs. It suppressed the volatilization and thermal decomposition of flammable volatiles, and hindered the heat transfer and oxygen supply, improving the thermal stability of each component. Added hydroxide FRs showed comprehensive effects of cooling, dilution, adsorption and neutralization, and the generated active oxide facilitated the intumescent layer of expandable graphite to be carbonized. The selected FR played flame retarding and smoke suppressing roles on thermal decomposition of each component. Finally, the compositional formulation of compound FR was proposed to develop a new compound FR for bituminous materials based on the suppression of matched FR on each bituminous component. The developed compound FR efficiently suppressed bituminous thermal decomposition, and lowered the release amount of harmful volatiles and heat when exposed to high temperature.

沥青会在高温下产生大量有害的气态产物和热量，危害人类健康和生态环境。为了开发一种有效的抑制沥青热分解和挥发释放的复合阻燃剂（FR），首先讨论了匹配的无卤阻燃剂对每种沥青组分的抑制作用，然后提出了组成配方以开发新的复合阻燃剂。用于沥青，抑制沥青的热分解和挥发物释放。结果表明，匹配的FR抑制了吸热和放热反应，降低了热分解速率，并阻碍了每个组分的整体热分解进程。此外，所选FR抑制了从每种组分释放出的挥发物的动态释放过程。₂和H ₂O仍然是来自每种沥青组分的主要气态产物。另外，由于匹配的FR的协同作用，产生了重叠且无空隙的阻挡层。它抑制了易燃挥发物的挥发和热分解，并阻碍了热传递和氧气供应，从而提高了每种组分的热稳定性。添加的氢氧化物阻燃剂显示出冷却，稀释，吸附和中和的综合作用，并且生成的活性氧化物促进了可膨胀石墨的膨胀层碳化。所选的阻燃剂对每种组分的热分解起阻燃和抑烟的作用。最后，提出了复合阻燃剂的组成配方，以抑制每种沥青组分中的阻燃剂的合成为基础，开发出一种新的沥青材料复合阻燃剂。所开发的化合物FR有效地抑制了沥青的热分解，并降低了高温下有害挥发物和热量的释放量。