(a) the role of coverage;

After adding environmentally friendly halogen-free flame retardants to combustible materials, a glassy or stable foam coating can be formed at high temperatures to isolate oxygen, with heat insulation, oxygen insulation, and prevent the escape of combustible gases, so as to achieve flame retardancy. purpose. The reason is that on the one hand, it can prevent the polymer from further pyrolysis, on the other hand, it can prevent the internal thermal decomposition organisms from entering the gas phase to participate in the combustion process.

inhibition of chain reactions;

According to the chain reaction theory of combustion, what is needed to sustain combustion is free radicals. Environmentally friendly halogen-free flame retardants can act on the gas phase combustion zone to prevent the spread of the flame, so that the flame density of the combustion zone is reduced, and the combustion reaction rate is reduced until the end. Such as halogen-containing flame retardants, its evaporation temperature and polymer decomposition temperature of the same or similar, when the polymer is heated decomposition, the flame retardant also volatilized, it can capture the free radicals in the combustion reaction, thereby preventing the spread of the flame, so that the flame density of the combustion zone decreased, and ultimately the combustion reaction rate decreased until the end.

3, non-combustible gas asphyxiation effect;

Halogen-free flame retardant environmental protection is not conducive to the decomposition of combustion gas when heated, and the concentration of combustible gas diluted to the lower limit of combustion, dilute the oxygen concentration in the combustion zone, prevent the combustion to continue, so as to achieve the role of flame retardant.