To explore the potential application of industrial waste, steel slag powder in combination with melamine pyrophosphate (MPP) was adopted to improve the flame retardancy of rigid polyurethane foam (RPUF). The incorporation of steel slag slightly reduced the thermal conductivity of the resulting flame-retardant RPUF samples. The addition of MPP and/or steel slag did not significantly alter the thermal stability in terms of T_-10% and T_max but did obviously increase the T_-50% value, suggesting the improved thermal resistance of the residues. The coaddition of MPP and steel slag into RPUF resulted in higher LOI values and lower peak heat release rates than the samples incorporating either MPP or steel slag alone. The superior flame retardancy could be attributed to MPP promoting char formation, which then acted as a barrier at the beginning of RPUF thermal decomposition; simultaneously, the thermally stable inorganics in the steel slag powder strengthened the thermal resistance of this char layer.

为了探索工业废料的潜在应用，采用钢渣粉与三聚氰胺焦磷酸盐（MPP）的组合来提高硬质聚氨酯泡沫（RPUF）的阻燃性。钢渣的掺入会稍微降低所得阻燃RPUF样品的热导率。MPP和/或钢渣的添加并没有显着改变T _-10％和T _max的热稳定性，但明显提高了T _-50％值，表明残留物的耐热性提高。与单独加入MPP或钢渣的样品相比，将MPP和钢渣共混到RPUF中可导致更高的LOI值和更低的峰值放热率。优异的阻燃性可归因于MPP促进焦炭形成，然后在RPUF热分解开始时充当屏障。同时，钢渣粉中的热稳定无机物增强了该炭层的耐热性。