氧化亚铜/三氧化钼对RPUF阻燃抑烟性能的影响

Effect of Cu_2O/MoO_3 on Flame Retardant and Smoke Suppression Properties of RPUF

比较了氧化亚铜(Cu_2O)与三氧化钼(MoO_3)填充可膨胀石墨(EG)/甲基磷酸二甲酯(DMMP)阻燃的硬质聚氨酯泡沫塑料(RPUF)氧指数(LOI)、烟密度(SDR)、热释放速率(HRR)和残炭率等的差异,并对其力学性能、阻燃性、燃烧性能及炭层形貌等进行了研究。结果表明,抑烟剂的添加使比压缩强度先增加后降低,但对比冲击强度和氧指数的提高收效甚少。抑烟剂添加量为10份时效果最优,6份时抑烟效率最高,MoO_3的抑烟效果优于Cu_2O。添加抑烟剂显著降低了产烟量,提高了残炭率,对热释放速率和总热释放量(THR)的降低影响较小。抑烟剂的添加促进了成炭效应,炭层结构越致密,残炭率越高,单位质量烟密度等级(SDRpm)越小。

The diffierences of LOI, SDR, heat release rate（HRR） and residual carbon rate between cuprous oxide（ Cu2O） and molybdenum trioxide（ MoO3 ） in flame-retarded rigid polyurethane foams were compared. The mechanical performances, flame retardant properties, combustion performance and carbon layer morphology were studied. The results showed that the specific compressive strength increased firstly and then decreased, the improvement of the specific impact strength and LOI had less effect due to the addition of smoke suppressor. The smoke suppression efficiency was highest when the addition of smoke suppressor was 6 phr, and the smoke suppression effect was best when the addition was 10 phr. The smoke suppression effect of MoO3 was better than that of Cu2O. The addition of smoke suppressor significantly reduced the smoke production, improved residual carbon rate and had less effect on the reduction of HRR and THR. The addition of smoke suppressor promoted the formation of char-forming effect, the structure of the carbon layer was denser, the residual carbon yields was higher and the SDRpm was smaller.