[O{MoO(O_2)_2}_2]^(2-)插层LDHs对软PVC协同阻燃效果的研究

The Influences of [O{MoO(O_2)_2}_2]^(2-) Intercalated LDHs on the Synergy Flame-retardant Properties of Flexible PVC

采用共沉淀法制备了MgAl-CO3-LDHs、ZnAl-CO3-LDHs及ZnMgAl-CO3-LDHs,然后采用离子交换法制备了[O{MoO(O2)2}2]2-插层的LDHs;将制得的LDHs样品分别与软PVC共混,并对其阻燃性能与机械性能进行了测试。结果表明,当LDHs阻燃剂的添加量不高于5份时,所得软PVC复合材料的氧指数均随着添加量的增大而增大,其中添加了5份[O{MoO(O2)2}2]2-插层ZnMgAl-LDHs阻燃剂后,软PVC的氧指数由27.5%提高到30.5%,其阻燃性能优于其他几种LDHs阻燃剂,表现出较好的协同阻燃效果。

MgAl-CO3-LDHs、ZnAl-CO3-LDHs and ZnMgAl-CO3-LDHs were synthesized by the coprecipitation method,and the [O{MoO（O2）2}2]2-intercalated LDHs were synthesized by anion exchanged method.The PVC composites were made by mixing LDHs with flexible PVC and other additives respectively and their flame retardancy were examined.The results show that when the addition dosage was not more than 5 phr,oxygen index（OI） of the PVC composite rose with the increase of the addition dosage of the LDHs flame-retardants.And added with 5 phr [O{MoO（O2）2}2]2-intercalated ZnMgAl-LDHs,the OI of the flexible PVC was improved from 27.5% to 30.5%,which show the nice synergy flame retardancy.