Construction of a P–N–Si flame retardant coating on the cotton fabric with the integration of biomass carbon dots and ammonium polyphosphate

In order to improve the flame retardancy of cotton fabric, a kind biomass carbon dots (CDs) particles were interspersed in ammonium polyphosphate (APP) layer achieve new efficient CDs-based APP (CDs-APP) composite retardant by integration technology. Then CDs-APP was coated on surface fabric. The microstructure and thermal stability particle characterized Transmission electron microscopy (TEM), Fourier infrared spectroscopy (FTIR) X-ray diffraction (XRD). mass ratio CDs 15.52%, which contains C, O, N, Si P elements, accounting for 28.86%, 42.29%, 19.01%, 2.58% 6.26%, respectively. flame-retardant mechanism investigated limiting oxygen index (LOI), vertical combustion, cone calorimeter, thermogravimetric thermogravimetric-infrared analysis. results showed that, when content about 10%, LOI value fabric rose 36.1%. burning time damage length have reduced 4.5 s, 5.6 cm, And achieved B1 level. addition decreased total heat release, release rate, smoke emission rate among peak-heat has 55.78%. By quantifying modes CDs-APP, it displayed superposition physical barrier effect, inhibition effect catalytic charring 45.96%, 8.62% 47.85%,