改性层状双氢氧化镁铝的制备及在PA6中的阻燃应用  

Preparation of Modified Mg-Al Layered Double Hydroxide and Its Flame-retardant Application in PA6 Composites

作　　者：蒋文俊[1] 许建[1] 赵春宝[1] 杨绪杰[1] 浦龙娟[1] 熊丽媛[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《南京理工大学学报》2009年第2期272-276,共5页Journal of Nanjing University of Science and Technology

基　　金：江苏省高技术项目(BG2007047);国家自然科学基金(50772048)

摘　　要：以九水合硝酸铝、六水合硝酸镁、硬脂酸钠以及氢氧化钠为原料,采用共沉淀法制备了改性层状双氢氧化镁铝(LDH),通过FTIR、XRD及TG-DTA对其进行表征。结果表明:当硬脂酸钠与九水合硝酸铝的摩尔比为1∶1时,C18H35O2-插层基本达到饱和,层间距由0.80 nm增加到2.98 nm。TG-DTA结果显示,由硬脂酸根插层的改性层状双氢氧化镁铝热稳定性好。以熔融挤出法制备PA6/LDH、PA6/MRP(微胶囊红磷)以及PA6/MRP/LDH复合材料,用LOI与UL-94垂直燃烧测定其阻燃性能,发现LDH与MRP有很好的协同阻燃作用。当加入8份LDH与12份MRP时,复合材料能达到V-0级且极限氧指数为28.5%。The modified Mg-Al layered double hydroxide （LDH） is synthesized by eoprecipitation method using Al（ NO3）3 ·9H2O, Mg（ NO3 ）2 ·6H2O, C18H35O02Na and NaOH as raw materials. The structure and the thermal stability of products are characterized by FTIR, XRD and TG-DTA. The results show that when the mole ratio between C18H35O2Na and Al（NO3）3 ,9H2O is 1, the quantity of CI8H35O2^- in the interlayer of LDH almost gets the maximum. Compared with the LDH-NO3^- , the interlayer spacing of LDH is increased from 0.80 nm to 2.98 nm. The LDH modified with C18H35 O2Na has a good thermal stability. PA6/LDH, PA6/MRP and PA6/MRP/LDH composites are prepared by melt extrusion. The composites are characterized by LOI and UL -94 vertical burning. The results show that there is a good flame retardant synergism between LDH and MRP in PA6 composites. When 8 phr LDH and 12 phr microeneapsulated red phosphorus （MRP） are added, the oxygen index of the composites is 28.5% and the vertical firing rankes V-0.

关 键 词：改性层状双氢氧化镁铝 复合材料 协同阻燃 制备 表征 

分 类 号：O614.22[理学—无机化学]