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首页> 外文期刊>Journal of industrial and engineering chemistry >Flame retardancy and thermal stability of ethylene-vinyl acetate copolymer nanocomposites with alumina trihydrate and montmorillonite
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Flame retardancy and thermal stability of ethylene-vinyl acetate copolymer nanocomposites with alumina trihydrate and montmorillonite

机译：乙烯-乙酸乙烯酯共聚物与三水合氧化铝和蒙脱土的纳米复合材料的阻燃性和热稳定性

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摘要

The development of fire retardant for wire and cable sheathing materials has oriented toward low smoke and halogen-free flame retardant technology to achieve better safety for electrical equipment and devices and to satisfy standards. However, many polymer flame resistance materials require a very high proportion of metal hydrate filler within the polymer matrix (60 wt%) to achieve a suitable level of flame resistance, which may lead to inflexibility, poor mechanical properties and problems during compounding and processing. In this study, the alumina trihydrate (ATH) was added to montmorillonite (MMT) as the halogen-free flame retardant of ethylene-vinyl acetate (EVA) copolymer, with various ratios of EVA/ATH/MMT. The prepared nanocomposites were characterized through various techniques of XRD, tensile test, DSC analysis, TGA, LOl evaluation, and FE-SEM to explore the effects of organic modified clay (OMMT) and the layer distance on the mechanical, thermal, and flame resistance properties. In the XRD examinations, the layer-distance of MMT increased from 1.27 to 1.96 nm when polymer was added to the octadecylamine modified MMT. The best tensile strength was obtained at 3 wt% MMT. In addition, the halogen-free flame resistance grade of EVA containing 3 wt% OMMT and 47 wt% ATH revealed the best elongation and fire resistance (LOl= 28). The tensile and flame resistance properties of the nanocomposites were also significantly improved.
机译：用于电线电缆护套材料的阻燃剂的发展已朝着低烟无卤阻燃技术发展，以实现电气设备和装置的更高安全性并满足标准。但是，许多聚合物阻燃材料需要在聚合物基质中有很高比例的金属水合物填料（60 wt％）才能达到合适的阻燃水平，这可能导致不挠性，较差的机械性能以及在混炼和加工过程中出现问题。在这项研究中，将三水合氧化铝（ATH）添加到蒙脱石（MMT）中，作为乙烯-乙酸乙烯酯（EVA）共聚物的无卤阻燃剂，并使用各种比率的EVA / ATH / MMT。通过XRD，拉伸试验，DSC分析，TGA，LOl评估和FE-SEM等多种技术对制备的纳米复合材料进行表征，以探索有机改性粘土（OMMT）和层距对机械，耐热和阻燃性能的影响。属性。在XRD检查中，当将聚合物添加到十八烷基胺改性的MMT中时，MMT的层距从1.27 nm增加到1.96 nm。在3wt％的MMT下获得了最佳的拉伸强度。另外，包含3重量％的OMMT和47重量％的ATH的EVA的无卤素阻燃等级显示出最佳的伸长率和阻燃性（LO1 ＝ 28）。纳米复合材料的拉伸和阻燃性能也得到了显着改善。

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