The flame retardant mechanism of silicone flame retardants mainly includes the following aspects:
Form an inorganic heat insulation and protective layer: When silicone flame retardants burn, they will migrate to the material surface, forming a silicone-enriched layer. At high temperatures, silicone flame retardants decompose to form an inorganic thermal insulation protective layer containing Si-O bonds and Si-C bonds. This protective layer can prevent the decomposition products generated by combustion from escaping and inhibit the thermal decomposition of polymer materials, thereby achieving the goals of high flame retardancy, low smoke emission and low harmfulness.
Preventing the overflow of combustion decomposition products: The protective layer formed by silicone flame retardants not only isolates oxygen and heat but also prevents the overflow of combustion decomposition products, reducing the release of flammable gases in fires and further lowering the risk of fire.
Inhibiting the thermal decomposition of polymer materials: Silicone flame retardants, through their unique chemical structure, can inhibit the thermal decomposition of polymer materials at high temperatures, slow down the burning rate of the materials, and buy time for fire extinguishing and personnel evacuation.
Improving the structure after combustion: Silicone flame retardants can also improve the structure of materials after combustion, making the surface structure after combustion continuous and dense with almost no large pores, thereby enhancing the flame retardant performance of the material.
