磷酸酯与蒙脱土协效阻燃rPET／PC合金的研究

通过极限氧指数（LOI）、力学性能测试、热重分析（TGA）和扫描电镜（SEM）分析表征手段，研究了磷酸酯（PX-220）及其与蒙脱土（MMT）协效阻燃对rPET／PC合金材料的阻燃性能和力学性能的影响。结果表明，单独添加15％PX-220后，阻燃材料的氧指数达到27％；将2％MMT与15％PX-220并用，阻燃合金材料的氧指数提高到29％，但力学性能下降明显。TG分析表明，PX-220与MMT共同作用使阻燃材料的起始分解温度比未加入阻燃剂rPET／PC合金材料的降低，在失重约20％后阻燃材料的热失重速率减小，最终残炭量增加。SEM显示炭层更加完整、致密地覆盖了整个燃烧表面。

Synergistic Flame Retardant Effect of Phosphate Ester and Montmorillonite on Recycled PET and PC Alloys

The effect of phosphate ester（PX-220） and its flame retardant synergism with Montmorillonite （MMT） on the flame-re- tardant properties and mechanical properties of recycled PET（rPET） and PC alloys was investigated by means of limiting oxygen index, mechanical properties testing, thermo-gravimetie analysis and scanning electron microscopic observation. The results showed that adding only 15% phosphate ester into the rPET/PC alloy, the oxygen index was up to 27%, and its oxygen index further increased to 29% when 2% MMT and 15% PX-220 was simultaneously used to fill rPET/PC alloy. However,there was an：obvious decrease in mechani- cal properties. The thermo-gravimetic analysis indicated that the initial decomposition temperature of flame retardant materials modified with PX - 220 and MMT together was lower than that of rPET/PC alloy without flame retardants, and that the thermal weight loss rate reduced after thermal weight loss was about 20% and the final char residue increased significantly. SEM images displayed that char residue layer was more integrated and dense to cover the burning surface of flame retarded material.