Effects of ternary potassium containing intumescent flame retardant coating on the combustion and thermal degradation properties of reconstituted tobacco sheet

Publication date: Available online 6 June 2019Source: Thermochimica ActaAuthor(s): Ning Shao, Fang Xue, Li Hou, Dongliang Li, Yun Gao, Xiaolan ZhuAbstractReconstituted tobacco sheet (RTS) was first modified by ternary intumescent flame retardant (IFR) coating, composed of ammonium polyphosphate (APP), chitosan (CS), and potassium citrate (PC) by spraying deposition sequentially. The effects of composite coating on the combustion behavior and thermal degradation of RTS were studied by micro-scale combustion calorimetry (MCC), cone calorimetry (CC) and thermogravimetric analysis coupled by Fourier transform infrared spectrometer (TG-FTIR). MCC analysis indicated that the ternary coating presented the best flame retardancy with the proportion of APP, CS and PC at 1:1:5 (wt %). TG-FTIR results showed that APP-CS-PC coating reduced the maximum mass loss rate and the release of harmful gaseous products at the stage of char decomposition and PC promoted the formation of a potassium carbon complex, which was also supported by carbonyl compounds analysis. Moreover, for APP-CS-PC-RTS cigarette, the formaldehyde yield in mainstream smoke and the highest temperature of burning cone decreased by 67.28% and 100.1℃, respectively.Graphical abstract
Source: Thermochimica Acta - Category: Chemistry Source Type: research