Flame retardant, also known as flame retardant, flame retardant or flame retardant, is an auxiliary agent used to improve the flame retardancy of materials, prevent materials from being ignited, and inhibit the spread of flame, which is helpful to prevent fires, slow down the spread of fire in case of fire, reduce the release of heat, smoke and toxic substances, and most importantly, increase the time for safe escape.
The flame retardant mechanism of flame retardant mainly includes:
Endothermic effect: the flame retardant decomposes and volatilizes when heated to absorb heat, which reduces the surface temperature of combustible materials and plays a flame retardant role;
Covering function: after heating, a covering layer is formed to insulate heat and oxygen;
Interrupt chain reaction: capture the free radicals produced by combustion, thus delaying or terminating the combustion reaction;
Asphyxiation of incombustible gas: incombustible gas is decomposed by heat, which dilutes the concentration of oxygen and combustible gas.
There are many kinds of flame retardants, which can be divided into organic flame retardants and inorganic flame retardants according to their chemical structures. According to the types of elements, it can be divided into halogen system, phosphorus system, nitrogen system, silicon system, magnesium aluminum system, molybdenum system and so on. According to the relationship between flame retardant and flame retardant materials, it can be divided into additive flame retardant and reactive flame retardant.