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Effects of metal oxides on intumescent flame-retardant polypropylene

机译：金属氧化物对膨胀型阻燃聚丙烯的影响

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摘要

Variable amounts of transition metal oxides (MO), such as MnO_2, ZnO, Ni_2O_3, etc., were incorporated into blends of polypropylene (PP)/ammonium polyphosphate (APP)/dipentaerythritol (DPER) with the aim of studying and comparing their effects with main-group MO on intumescent flame retardance (IFR). The PP/IFR/MO composites were prepared using a twin-screw extruder, and the IFR behavior was evaluated through oxygen index and vertical burning tests. The progressive enhancement of flame retardancy has proved to be strongly associated with the interaction between APP and MO. With the aid of thermogravimetry (TG) analysis, Fourier transform infrared (FTIR) spectra and scanning electron microscopy, Ni_2O_3 has been shown to be the most effective among the aforementioned three MO. The flame-retardant mechanism of the IFR system is also discussed in terms of catalytic charring, which relates to complex formation through the d-orbitals of the transition metal elements. It is considered that the melt viscosity of a PP/APP/DPER blend containing Ni_2O_3 corresponds well to the gas release with increasing temperature.
机译：将可变量的过渡金属氧化物（MO）（例如MnO_2，ZnO，Ni_2O_3等）掺入聚丙烯（PP）/聚磷酸铵（APP）/双季戊四醇（DPER）的混合物中，以研究和比较它们的作用与MO膨胀型阻燃剂（IFR）为主。使用双螺杆挤出机制备PP / IFR / MO复合材料，并通过氧指数和垂直燃烧测试评估IFR行为。阻燃性的逐步增强已证明与APP和MO之间的相互作用密切相关。借助热重分析（TG），傅立叶变换红外（FTIR）光谱和扫描电子显微镜，Ni_2O_3已被证明是上述三种MO中最有效的。还根据催化炭化讨论了IFR系统的阻燃机理，该炭化涉及通过过渡金属元素的d轨道形成络合物。认为包含Ni_2O_3的PP / APP / DPER共混物的熔体粘度与随温度升高的气体释放良好地对应。

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