To enhance the flame retardancy of silicone-acrylic emulsion(SAE),MDI-modified silicon-acrylic composite Si-P-C-N coating.is constructed by using SAE as the base material,melamine polyphosphate(MPP)and diethyl phosphite(DEP)as acid sources,β-cyclodextrin(β-CD)as carbon source,urea as gas source,and 4,4'-diphenylmethane diisocyanate(MDI-100L)as synergist.The effect of MDI-100L on flame retardancy and smoke suppression of the composite coating is studied by cone calorimeter(CONE)and thermogravimetric infrared analyzer(TG-IR).The microstructure was analyzed by infrared spectrometer(FT-IR)and scanning electron microscope(SEM).The thermal stability was analyzed by pyrol-ysis kinetic calculation.The anti-aging performance was tested using an ultraviolet aging tester.The results show that the appropriate dosage of MDI-100L(1.0％)promotes the formation of non-combustible residues that block heat sources and firesources during combustion,and releases refractory gases during combustion,so that the peak heat release rate and smoke produc-tion are reduced by 36.05％and 23.01％,respectively.According to the pyrolysis kinetic analysis,1.0％of the sample increased the Eα from 386.76 kJ/mol to 412.39 kJ/mol at 370～455 ℃,indicating enhanced thermal stability.
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