ZIF-67 In Situ Grown on Attapulgite: A Flame Retardant Synergist for Ethylene Vinyl Acetate/Magnesium Hydroxide Composites

Abstract

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.

Development of bio‐based magnesium phosphate flame retardant for simultaneously improved flame retardancy, smoke suppression and mechanical properties of HDPE

“…Therefore, when MH is compounded with MHPA, the thermal stability of HDPE/MHPA/MH can be effectively improved, and T 5% can be increased to 421.8°C. In addition, the change of temperature of the maximum thermal decomposition rate ( T m ) is also affected by the early decomposition of MHPA 19,20 . It can be seen from Figure 3b that the T m of samples containing MHPA decreases to about 472.9°C, while the T m of pure HDPE and HDPE/MH samples is higher, up to 488.8°C, which indicates that the addition of MH does not promote the early decomposition of HDPE.…”

Interfacial Co–O–Fe bonding in novel amorphous NiCo-ZIF@MIL-100 as efficient active sites enabling electrocatalytic water oxidation

“…The peaks of NiCo-ZIF are consistent with those reported in the literature, further indicating the successful synthesis of NiCo-ZIF. 35,36 For MIL-100, the peak at 1649 cm −1 corresponds to the stretching vibration of the C]O acid ligand, suggesting that the carboxyl group in H 4 DODBC is deprotonated and then coordinated with Fe 3+ to form Fe-MIL-100. 37 In the FT-IR spectrum of NiCo-ZIF@MIL (1 : 2), the disappearance of characteristic peaks of NiCo-ZIF may be due to the coating with MIL-100.…”

Comprehensive Review of Recent Research Advances on Flame-Retardant Coatings for Building Materials: Chemical Ingredients, Micromorphology, and Processing Techniques

“…Vermiculite also exhibits layered microstructures containing magnesium, aluminum, iron, and silicon, which is intumescent and peels off the surface of building materials under fire [ 37 ]. In addition, natural minerals such as attapulgite and halloysite are nanotubes or nanorods, which can easily disperse in flame-retardant coatings [ 38 , 39 ].…”