In
this study, to develop an organic/inorganic synergistic flame
retardant and to reduce the dosage and cost of flame retardants, organic/inorganic
synergistic flame retardants, hexakis(4-boronic acid-phenoxy)-cyclophosphazene
(CP-6B), and magnesium hydroxide (MH) were chosen. The flame retardant
properties of CP-6B/MH in epoxy resin (EP) were discussed. EP/CP-6B/MH
had better flame retardancy and heat resistance compared with EP/CP-6B
and EP/MH. A limiting oxygen index of EP/3.0%CP-6B/0.5%MH of 31.9%
was achieved, and vertical burning V-0 rating was achieved. Compared
with EP, the cone calorimeter dates of EP/CP-6B/MH decreased. CP-6B/MH
inhibited combustion and did little to damage mechanical properties.
Besides, the flame retardant mechanism was studied by scanning electron
microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction,
Fourier transform infrared spectroscopy, and pyrolysis–gas
chromatography–mass spectrometry. CP-6B/MH exerted good synergistic
effects.
In this study, to develop an organic/inorganic synergistic flame retardant, organic phosphorus-nitrogen flame retardant 6,6-(((sulfonylbis(4,1-phenylene)) bis(azanediyl))bis(thiophen-2-ylmethylene))bis(6H-dibenzo[c,e][1,2]oxaphosphinine 6-oxide (DOPO-N) and inorganic boron flame retardant zinc borate (ZB) were selected. The flame retardant properties of polyethylene (PE) containing ZB/DOPO-N were investigated. PE/20% ZB/10%DOPO-N had better thermal stability and flame retardant properties. The limiting oxygen index of PE/20%ZB/10% DOPO-N reached 24.6%, and UL 94 V-0 rating was attained. The peak heat release rate, total heat release, average effective heat combustion, and fire growth index of PE/20%ZB/10% DOPO-N were lower than when ZB and DOPO-N were added separately. In addition, the flame retardant mechanism was investigated using scanning electron microscopy, X-ray diffraction, energy dispersive X-ray, and Fourier transform infrared spectroscopy. ZB/DOPO-N simultaneously exerted condensed phase and gas phase flame retardant effect. POLYM. ENG. SCI., 60:414-422, 2020.
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