【摘要】 采用直接沉淀法制备了Mn²⁺、Fe³⁺、Co²⁺、Ni²⁺ 4种过渡金属的植酸盐（M-Phyt）,并将其作为阻燃剂用于软质聚氯乙烯（PVC）的阻燃消烟处理。结果表明,所合成的M-Phyt颗粒呈不规则形状;在N2气氛下,4种阻燃剂的残炭量顺序为Mn-Phyt>Co-Phyt>Fe-Phyt>Ni-Phyt;阻燃剂添加量为15%（质量分数,下同）时,PVC/Co-Phyt复合材料的极限氧指数测试效果最好,极限氧指数从24.9%提高到了28.3%,烟密度等级达到了75.09%;PVC/Fe-Phyt复合材料的抑烟效果最好,SDR从94.55%降低到了48.96%,其极限氧指数为27.7%;加入植酸盐后,复合材料的残炭量都大幅度提高,PVC/Co-Phyt复合材料的残炭量高达22.08%,PVC/Ni-Phyt复合材料的残炭量也提高了9.09%。更多还原

【Abstract】 Transition metallic phytates(M-Phyt)containing different rare earth elements were synthesized by a direct precipitation method,and then it was used as a flame-retardant and smoke suppressant for flexible PVC.It indicated that the prepared M-Phyt particles exhibited an irregular shape.Char yields of M-Phyt in nitrogen were in an order of Mn-Phyt>Co-Phyt>Fe-Phyt>NiPhyt.PVC compound containing 15 wt% Co-Phyt showed the highest LOI,which was improved from 24.9 % to 28.3 %,and its SDR reached 75.09 %.Fe-Phyt exhibited an optimum smoke suppression effect on PVC by reducing SDR of PVC/Fe-Phyt compound from 94.55 % to48.96 %,and LOI of PVC/Fe-Phyt compound was 27.7 %.Char yields of the compounds were greatly improved with the addition of M-Phyt.Char yield of PVC/Co-Phyt composite was as high as 22.08 wt%,but char yield of PVC/Ni-Phyt composite increased by 9.09 %.更多还原