ZIF-67 In Situ Grown on Attapulgite: A Flame Retardant Synergist for Ethylene Vinyl Acetate/Magnesium Hydroxide Composites.
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2022
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Polymers
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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.
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Keywords
ZIF-67, Attapulgite, Magnesium hydroxide, Flame retardant