Ma De-Xin, Yang Yuan, Yin Guang-Zhong, Vázquez-López Antonio, Jiang Yan, Wang Na, Wang De-Yi
Liaoning Provincial Key Laboratory for Synthesis and Preparation of Special Functional Materials, Shenyang University of Chemical Technology, Shenyang 110142, China.
Escuela Politécnica Superior, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda Km 1800, 28223 Madrid, Spain.
Polymers (Basel). 2022 Oct 19;14(20):4408. doi: 10.3390/polym14204408.
ZIF-67@ATP was prepared by the in situ growth of the zeolite imidazole frame (ZIF-67) on the surface of attapulgite (ATP). The structure and surface morphology of ZIF-67@ATP were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Different mass fractions of ATP and ZIF-67@ATP were added to ethylene vinyl acetate (EVA)/magnesium hydroxide (MH) composites as flame retardant synergists. The flame retardancy of EVA composites was evaluated by the limiting oxygen index (LOI) test, UL-94 test and cone calorimeter test. Composites containing 3 wt% of ZIF-67@ATP reached an LOI value of 43% and a V-0 rating in the UL-94 test, and the ignition time of the composite increased from 38 s to 56 s. The tensile strength and impact strength of the composites did not change significantly, but the elongation at break increased greatly. Typically, for composites containing 4 wt% of ZIF-67@ATP, the elongation at break of the composites increased from 69.5% to 522.2% compared to the samples without the synergist. This study provides novel insights into the application of attapulgite in the field of flame retardant polymer materials.
ZIF-67@ATP是通过在凹凸棒石（ATP）表面原位生长沸石咪唑框架（ZIF-67）制备而成。采用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对ZIF-67@ATP的结构和表面形貌进行了表征。将不同质量分数的ATP和ZIF-67@ATP作为阻燃增效剂添加到乙烯-醋酸乙烯酯（EVA）/氢氧化镁（MH）复合材料中。通过极限氧指数（LOI）测试、UL-94测试和锥形量热仪测试对EVA复合材料的阻燃性能进行了评估。含有3 wt% ZIF-67@ATP的复合材料在UL-94测试中达到了43%的LOI值和V-0等级，复合材料的点燃时间从38 s增加到56 s。复合材料的拉伸强度和冲击强度没有显著变化，但断裂伸长率大幅增加。通常，对于含有4 wt% ZIF-67@ATP的复合材料，与不含增效剂的样品相比，复合材料的断裂伸长率从69.5%增加到522.2%。本研究为凹凸棒石在阻燃聚合物材料领域的应用提供了新的见解。
