Flame retardancy, combustion, and ceramization behavior of ceramifiable flame‐retardant room temperature vulcanized silicone rubber foam

Abstract

Two types of ceramifiable flame‐retardant room temperature vulcanized (RTV) silicone rubber foam containing mica power (MP) were prepared by using glass powder (GP) as fluxing agents and aluminum hydroxide (ATH) as flame‐retardant agent, respectively. The flame retardant, combustion behavior, and thermal stability of ceramifiable flame‐retardant RTV silicone rubber foams were investigated. The results show that GP is not conducive to the flame retardancy and thermal stability improvement of the foams. On the contrary, MP and ATH can significantly improve the flame retardancy and thermal stability at high temperatures of the foams. The foams with addition of MP and ATH can reach to a high limiting oxygen index value of 35.8 with V‐0 rating in the vertical combustion test, and the total heat release and total smoke production of the foams are 21.0% and 61.7% lower than of the pure RTV silicone rubber foam, respectively. Furthermore, the structural and morphological changes of the foams under different pyrolysis conditions were studied, so as to reveal its ceramifiable mechanism under different fire scenarios. The results show that GP does not promote the formation of more char residue during pyrolysis, but it can greatly lower the ceramifiable temperature, resulting in a superior ceramic phase char residue. The foams including MP and ATH have a high char residue content; nevertheless, a comparatively higher temperature is necessary to create ceramic phase char residue.

Study on mechanical properties and fire resistance of porous ceramic silicone rubber

“…8 Through the structural and morphological changes under different pyrolysis conditions, it is found that GP does not promote the formation of more residual carbon during pyrolysis, but it can greatly reduce the ceramisation temperature and produce solid ceramic residual carbon. 9 The introduction of flame retardants is the most effective way to improve the flame retardancy of silicone rubber. 10 The addition of the phosphorus-based flame-retardant sodium tripolyphosphate (STPP) to silicone rubber increases the relative content of the crystalline phase by about 25%, which can enhance the shape stability and self-supporting properties of the composites at high temperatures.…”

Effect of gamma radiation and modified CeO2 on the physicomechanical properties of silicon rubber nanocomposites

“…Room temperature vulcanized silicone rubber (RTVSR) utilizes innumerous fields where it is simplicity in industrialization and shaping as well as its distinctive qualities [1][2][3][4][5][6]. However, the RTVSR's molecular chains include a high concentration of flammable C and H atoms, so it combustible [7]. As a result, it has exceptional thermal stability and temperature tolerance, but because it may ignite at very low temperatures, its use in a variety of sectors constrained especially in aircraft, electrical and electronic appliances and sealing products.…”

Performance Research of Natural Mica Modified with Zirconium-Based Metal–Organic Frameworks for an Epoxy Resin Anti-Corrosion Coating

“…Natural mica exists widely in nature with low prices. Mica demonstrates some exceptional performance compared to other 2D layered materials, such as high transparency [17], ultraviolet shielding [18], electrical insulation [19], temperature stability [20,21], chemical stability [21], and biocompatibility [19]. These superior performances have made mica widely studied in some fields.…”