Abstract
A comparative investigation on the flame resistance and microstructure of graphite modified coatings is preliminarily investigated, which contains expanded graphite (EGd) and various expandable graphite (EGe). The increased peak heat release rate (p-HRR) from 83 to 123 kW m−2 for the 5 wt% EGd-containing sample reveals an obvious antagonistic effect, due to the poor adhesion between EGd and geopolymeric coating. However, the remarkably synergistic flame-retarding effect is identified between geopolymeric coating and the EGe with an expansion rate of 425 mL g−1, evidenced by the reduced fire growth index and p-HRR, the former drops from 0.25 to 0.17 kW m−2 s−1, and the latter decreases from 83 to 76 kW m−2 in comparison to that of barely geopolymeric coating. Due to the condensation of Q41 or Q42 siliceous groups during firing from results of 29Si magic angle spinning nuclear magnetic resonance, the EGe doped coating facilitates the formed shielding with voluminously lamellar structure. It clarifies the interactions between graphite and geopolymer coating including “barrier effect”, “candlewick effect”, “labyrinth effect”, and “popcorn effect”, preliminarily illustrating the flame-retarding mechanism.
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