Abstract
SummaryThe fire protection and thermal stability properties of intumescent fire‐retardant coatings filled with three various clay nano‐fillers (layer double hydroxide [LDH], montmorillonite [MMT], and sepiolite) were compared by fire protection tests and thermo‐gravimetric analysis. The fire protection tests show that the incorporation of three fillers improves the fire protection properties of the intumescent fire‐retardant coatings and the addition of 1 wt% sepiolite exhibits the lowest flame spread rating of 9.9 and equilibrium backside temperature of 164.5°C at 900 seconds. TG analysis shows that the incorporation of nano‐fillers imparts a considerable enhancement of thermal stability and char formation to the intumescent coatings. Especially, the coating with 1 wt% sepiolite acquires the highest residual weight of 34.2% among the samples. Char residue analysis presents that the introduction of clay nano‐fillers plays a positive role in enhancing the compactness and anti‐oxidation ability of the char residues, and this positive effect as well as the flame‐retardant efficiency depends on the types of clay nano‐fillers. The three types of layered clay nano‐fillers exhibit synergistic flame‐retardant effectiveness in the order of sepiolite > MMT > LDH.
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