Facile preparation of aluminum triphosphate-containing intumescence flame-retarding coatings using aliphatic waterborne polyurethane as the binder

The effect of aluminum triphosphate (ATP) on the flame resistance of intumescent flame retardant coatings (IFRCs) has been explored, using the aliphatic waterborne polyurethane (AWP) as the binder, the quantitative analysis on the pyrolysis kinetics of ATP-containing AWP-based coating is investigated. It determines that an appropriate dosage (2 wt%) of ATP in the AWP-based coating exerts an enhanced flame resistance, evidenced by the fire growth index decreased from 0.49 to 0.34 kW m(-2) s(-1), and the shrunk heat release rate during the whole burning. Due to the heat sink, filling of Al(PO3)(3) for reinforcing char residues, and the catalytic charring, the doped ATP contributes to the increased E-alpha from 26.33 to 39.38 kJ mol(-1) corresponding to the stage of 95-215 degrees C, according to the fitting 3D Jander model, which mainly governs the whole pyrolysis process of coatings. It identifies a quantitative evaluation on the flame resistance of AWP-based IFRCs modified by inorganic ATP.