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首页> 美国卫生研究院文献>Materials >Highly Efficient Composite Flame Retardants for Improving the Flame Retardancy Thermal Stability Smoke Suppression and Mechanical Properties of EVA
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Highly Efficient Composite Flame Retardants for Improving the Flame Retardancy Thermal Stability Smoke Suppression and Mechanical Properties of EVA

机译：高效复合阻燃剂可提高EVA的阻燃性热稳定性抑烟性和机械性能

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Ethylene vinyl acetate (EVA) copolymer has been used extensively in many fields. However, EVA is flammable and releases CO gas during burning. In this work, a composite flame retardant with ammonium polyphosphate (APP), a charring–foaming agent (CFA), and a layered double hydroxide (LDH) containing rare-earth elements (REEs) was obtained and used to improve the flame retardancy, thermal stability, and smoke suppression for an EVA matrix. The thermal analysis showed that the maximum thermal degradation temperature of all composites increased by more than 37 °C compared with that of pure EVA. S-LaMgAl/APP/CFA/EVA, S-CeMgAl/APP/CFA/EVA, and S-NdMgAl/APP/CFA/EVA could achieve self-extinguishing behavior according to the UL-94 tests (V-0 rating). The peak heat release rate (pk-HRR) indicated that all LDHs containing REEs obviously reduced the fire strength in comparison with S-MgAl. In particular, pk-HRR of S-LaMgAl/APP/CFA/EVA, S-CeMgAl/APP/CFA/EVA and S-NdMgAl/APP/CFA/EVA were all decreased by more than 82% in comparison with pure EVA. Furthermore, the total heat release (THR), smoke production rate (SPR), and production rate of CO (COP) also decreased significantly. The average mass loss rate (AMLR) confirmed that the flame retardant exerted an effect in the condensed phase of the composites. Meanwhile, the combination of APP, CFA, and LDH containing REEs allowed the EVA matrix to maintain good mechanical properties.
机译：乙烯乙酸乙烯酯（EVA）共聚物已广泛用于许多领域。但是，EVA易燃，燃烧时会释放出CO气体。在这项工作中，获得了包含多磷酸铵（APP），炭化发泡剂（CFA）和含稀土元素（REE）的层状双氢氧化物（LDH）的复合阻燃剂，并用于提高阻燃性， EVA基质的热稳定性和抑烟性。热分析表明，与纯EVA相比，所有复合材料的最大热降解温度提高了37°C以上。根据UL-94测试（V-0等级），S-LaMgAl / APP / CFA / EVA，S-CeMgAl / APP / CFA / EVA和S-NdMgAl / APP / CFA / EVA可以实现自熄性。峰值放热率（pk-HRR）表明，与S-MgAl相比，所有含REE的LDHs均明显降低了火力。特别是，与纯EVA相比，S-LaMgAl / APP / CFA / EVA，S-CeMgAl / APP / CFA / EVA和S-NdMgAl / APP / CFA / EVA的pk-HRR均降低了82％以上。此外，总热量释放（THR），烟雾产生率（SPR）和一氧化碳产生率（COP）也显着降低。平均质量损失率（AMLR）证实了阻燃剂在复合材料的凝结相中发挥了作用。同时，APP，CFA和包含REE的LDH的组合使EVA基质保持良好的机械性能。

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