Abstract
Ethylenediamine modified ammonium polyphosphate (EDA-MAPP) and charring-foaming agents (CFA) were prepared using a simple chemical method and further used to make intumescent flame retardant coatings based on epoxy resin. The content of MAPP and CFA was fixed at a ratio of 2:1. Nanoparticles of magnesium aluminate (MgAl2O4 NPs) have been introduced into the flame retardant coating formulation in various quantities to evaluate the promotional action of MgAl2O4 NPs with a flame retardant coating system. The promotional action of MgAl2O4 NPs on the flame retardant coating formulation was studied using a vertical burning test (UL-94V), limiting oxygen index (LOI), thermogravimetric analysis (TGA) and Fourier transform infra-red spectroscopy (FTIR). The UL-94V results indicated that the addition of MgAl2O4 effectively increased flame retardancy and met the V-0 rating at each concentration. The TGA results revealed that the incorporation of MgAl2O4 NPs at each concentration effectively increased the thermal stability of the flame retardant coating system. Cone-calorimeter experiments show that MgAl2O4 NPs effectively decreased peak heat release rate (PHRR) and total heat release (THR). The FTIR results indicated that MgAl2O4 NPs can react with MAPP and generate a dense char layer that prevents the transfer of oxygen and heat.
Highlights
Wood has been used as a primary structural raw material due to its valuable properties such as complexion, low mass, high strength and high insulation properties
The intumescent flame retardant (IFR) coating system consisted of MAPP, charring-foaming agent (CFA) and MgAl2 O4
The intumescent flame retardant (IFR) coating system consisted of MAPP, CFA and MgAl2O4
Summary
Wood has been used as a primary structural raw material due to its valuable properties such as complexion, low mass, high strength and high insulation properties. Several studies have been done to develop and apply different types of carbonizing agents in practice [11] In this regard, researchers have shown a great deal of attention over the last decade to the synthesizing of highly stable charring-foaming agents with triazine derivatives [12]. Various types of triazine derivatives have been used as charring and foaming agents in IFR systems, and their effects have been extensively investigated [15,16]. Magnesium aluminate (a white colored powder), is a non-carcinogenic agent It can be used as a synergist to enhance the performance of an intumescent flame retardant system. The readily available, cost-effective and non-hazardous nanoparticles of magnesium aluminate (MgAl2 O4 NPs) have been selected as a promotional agent to investigate their action on the epoxy/IFR coating system. 10,investigate x FOR PEER the REVIEW employed synergism between magnesium aluminate and epoxy/IFR systems. 3 of 17
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