Synergistic effect of Fe-modified organoclay on intumescent flame-retardant LDPE system

摘要

@@Recently, polymer nanocomposites emerged as one of the most promising developments in the area of flame retardancy, appearing to offer significant advantages over conventional formulations, especially polymerlayered silicate nanocomposites.111 In this paper, we modified OMMT with Fe3+, which could penetrate into the gallery of organoclay.'21 Due to the properties of Fe3+, such as promoting the crosslinking reaction of the matrices, and capturing radicals during combustion, Fe-modified MMT exhibits a better synergistic effect compared with that of normal organoclay.131 Then the Fe-MMT/IFR/LDPE nanocomposites were melt blended using a counterrotation twin screw extruder. IFR is composed of a charring agent and ammonium polyphosphate (APP) at a suitable ratio. We explored the best mass ratio and adding amount of Fe-MMT. Limiting the oxygen index (LOI) and UL-94 tests have been carried out to estimate the fire-related properties of FeMMT/IFR/LDPE system.