Most of the flame retardants used in sponges are additive flame retardants, while reactive flame retardants are mainly used in thermosetting resins such as epoxy resin and polyurethane. The original function of flame retardants is to interfere with the three basic elements of oxygen, heat and combustibles to maintain combustion. So what is the principle of flame retardant sponge? Now let the PU pigment manufacturer introduce to you.
1. Flame retardants can produce heavier non-combustible gas or boiling point liquid, covering the surface of the sponge, blocking the connection between oxidation and combustibles.
2. Reduce the surface temperature of the polymer through the endothermic decomposition or endothermic sublimation of the flame retardant.
3. Flame retardants produce a large amount of non-combustible gas, talk about the flammable gas concentration and oxygen concentration in the burning area.
4. The flame retardant captures free radicals and interrupts the chain oxidation reaction.