Silica-coated metal-organic framework-β-FeOOH hybrid for improving the flame retardant and smoke suppressive properties of epoxy resin

Abstract

In order to improve the flame retardancy and smoke suppression of epoxy resin (EP), ZIF-67 particles were loaded on β-FeOOH by electrostatic action and coated with SiO 2 to prepare SiO 2 @ZIF-67-β-FeOOH (SZF). Scanning electron microscope (SEM) results showed that the SZF hybrid was successfully prepared. Different proportions of SZF were added to EP to study its combustion performance. The combustion results show that the limiting oxygen index (LOI) of the SZF composite with 5% flame retardant is increased to 31.9%, and the UL-94 flame retardant rating is increased to V-0. Peak heat release rate (pHRR), total heat release (THR), smoke release rate (SPR) and total smoke release (TSP) were reduced by 64.0%, 48.2%, 31.4% and 48.3%, respectively. According to the results of carbon analysis, the main flame retardant and smoke suppression mechanisms of SZF are analysed. In this work, a new idea is provided for improving the flame retardant and smoke suppression performance of EP.

An Organometallic Flame Retardant Containing P/N/S–Cu2+ for Epoxy Resins with Reduced Fire Hazard and Smoke Toxicity

“…Metal oxides and their hydroxides can be used as inorganic flame retardants to effectively improve the smoke suppression performance of polymeric materials, − but owing to their low flame-retardant efficiency, it has to be added in large quantities to obtain the fireproof effect, which seriously damages the mechanical properties of polymeric materials . Much research has been conducted to show that the combination of metal ions introduced into flame retardants can successfully reduce the smoke emissions from the burning of compound materials − and catalyze the conversion of toxic gases, significantly reducing environmental pollution. Metal organic framework and other carbon-forming agents for synergy can promote the matrix into carbon, protect the matrix from further combustion, and enhance the flame-retardant properties of the composite.…”