Preparation of Ultrafine Nanoparticles under Supergravity Field and Their Flame-Retardant Properties

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• 作者：Hong-Yan Zeng ; Pei-Han Zhu ; Sheng Xu ; Meng-Chen Liao ; Zhi-Qing Zhang ; Xiao-Jun Liu ; Jin-Ze Du
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：December 3, 2014
• 年：2014
• 卷：53
• 期：48
• 页码：18380-18389
• 全文大小：487K
• ISSN：1520-5045

文摘

Ultrafine Mg/Al hydrotalcite (MHT) nanoparticles were prepared using a new method in a rotating packed bed (RPB). The MHT nanoparticles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), Fourier transform infrared (FT-IR) spectroscopy, and laser particle size analysis. By varying preparation parameters such as precipitation temperature, precipitation time, aging time, and [CO₃^{2鈥?/sup>]/[NO₃鈥?/sup>] molar ratio in reaction solution, we investigated the effects of the parameters on the precipitation yield of the MHT nanoparticles. Response surface methodology (RSM) coupled with Box鈥揃ehnken design was used to optimize the preparation parameters, and an 85.5% yield of MHT nanoparticles with a Mg/Al molar ratio of 3 (MHT-3) was produced under the optimum conditions. The MHT-3 nanoparticles were melted and blended with polypropylene (PP) at different loadings of MHT-3. The PP/MHT-3 composite (PP/MHT-3) with a 10 wt % loading achieved an LOI value close to 21% and a UL 94 grade of V-2, and the mechanical properties of the PP/MHT-3 composite remained mostly unchanged compared to those of PP. Thermogravimetric analysis showed that the addition of 10 wt % MHT-3 resulted in an increase in both the onset and decomposition temperatures of PP polymer, indicating that the PP/MHT-3 composite exhibited good thermal properties. The results suggest that ultrafine hydrotalcite nanoparticles can be obtained in an RPB, providing a new approach for the industrial preparation of ultrafine hydrotalcite nanoparticles with good antiflaming performances.}