Novel nanocomposites based on epoxy resin and modified magnesium hydroxide: Focus on flame retardancy and mechanical properties

Abstract

In this work, a novel multifunctional organic-inorganic hybrid flame agent (AM-MEL) was prepared from magnesium hydroxide nanosheets decorated by nitrilotrimethylene triphosphonic acid and melamine. Then, an intrinsic flame-retardant epoxy resin (EP) was prepared by covalently incorporating AM-MEL nanoparticles. Meanwhile, ammonium polyphosphate (APP) was added into EP to form an intumescent flame retardant system with AM-MEL. The chemical structure of AM-MEL was characterized by Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and scanning electron microscopy. With the incorporation of 5 wt% AM-MEL and 15 wt% APP, EP/AM-MEL/APP could reach a limiting oxygen index value of 32.0% and achieve UL-94 V-0 rating, along with 88.0%, 70.0%, 81.5%, and 87.3% decrease in the peak heat release rate, total heat release, total smoke production, and the peak CO production rate, respectively, with respect to that of pure EP. The mechanisms of its flame retardant and smoke suppression were investigated. Novel nanocomposites based on epoxy resin and modified magnesium hydroxide: Focus on flame retardancy and mechanical properties. Polym Adv Technol. 2019;30: 3026 3037. https://doi.org/10.1002/pat.4734 3037 -LV ET AL.

A phosphorus/sulfur‐containing compound toward simultaneously endowing epoxy resin with good flame retardancy and high transparency

“…Many halogen‐containing flame retardants, although showing high efficiency, have been forbidden due to the environmental hazards stemming from the release of corrosive toxic volatiles during combustion 6,7 . Nowadays, phosphorus‐, 8–11 nitrogen‐, 12,13 and silicon‐containing 14 flame retardants have attracted widespread attention because of their high‐flame retardant efficiency and low toxicity. Especially, the compounds containing multiple flame‐retardant elements have become the research hotspot because of the synergistic effect of different elements on the gas and/or condensed phase 15–17 …”

Effect of modified nano/Mg(OH)2 on the flame retardancy and mechanical properties of NBR based on molecular simulation

“…However, although halogen-containing compounds can improve the flame retardancy, they have the problems of environmental pollution and strong toxicity, which seriously threaten human health and property safety. Therefore, it is urgently needed to develop functional green flame retardants to replace halogenated flame retardants [5,6]. Magnesium hydroxide (MH) is an excellent halogen-free environmentally-friendly flame retardant and smoke suppressant filler, which is widely used in the field of environmentally-friendly flame-retardant polymers [7][8][9][10].…”

Synergistic Flame Retardant Effect of Barium Phytate and Intumescent Flame Retardant for Epoxy Resin

“…At present, with the development trend of social environment friendliness, wide attention has been paid to bio-based flame retardants. Some natural materials have been used as flame retardants, such as deoxyribonucleic acid [ 22 ], gluten [ 23 , 24 , 25 ], starch [ 26 ], tea saponin [ 27 , 28 , 29 ], chitosan [ 30 ], and phytic acid (Pa) [ 31 , 32 , 33 ]. Pa consists of six phosphate groups, which is beneficial to the electrochemical stripping and makes the system have high flame retardancy.…”