In many occasions, material with flame retardant, commonly used occasions are electronic and electrical appliances, automobile industry also has a flame retardant requirements, but generally low. By adding flame retardant flame retardant can be realized. Most plastics with combustible. With the wide application of plastics in construction, furniture, transportation, aviation, aerospace, electrical appliances, improve the flame retardant plastics has become a very urgent issue.

Flame retardant and flame retardant, fire-resistant agent or fire retardant, flame retardant polymer with flammable functional additives in nature; they are mostly in the periodic table of elements of V A (P), A VII (bromine and chlorine) and A (antimony, aluminum) compound elements.

Have smoke suppression effects of molybdenum compounds, tin compounds and iron compounds are flame retardant category, mainly used in flame retardant plastics demand, delay or prevent plastic especially polymer plastics combustion, the ignition time of growth, light self extinguishing, it is hard to ignite.

Flame retardant principle

1) endothermic effect

Any burning out in a relatively short period of time the heat is limited, if can absorb part of the heat released by the fire in a relatively short period of time, then the flame temperature will reduce the radiation to the molecular surface and combustible pyrolysis and combustion will have effect on gasification into free radicals will reduce the heat, combustion reaction will be suppressed to a certain extent.

Under the condition of high temperature, flame retardant has strong endothermic reaction, the absorption part of the heat released from the combustion of combustible materials, reducing the temperature of the surface, effectively inhibit the generation of flammable gas combustion, prevent the spread of. Al (OH) 3 the fire retardant mechanism is through the polymer to improve the heat capacity, the thermal decomposition temperature before to absorb more heat, so as to improve its flame retardant properties. This kind of flame retardant and give full play to the combination of the water vapor absorbs heat characteristics, improve its flame retardant ability.

2) coverage

Adding flame retardant in combustible materials, flame retardant at high temperature can form stable foam glass or covering layer, isolate oxygen with heat and oxygen, prevent flammable gas to escape the role, so as to achieve the purpose of flame retardant.

Such as organic phosphorus flame retardant heat resistance can produce more stable structure of cross-linked solid material or carbide layer.

The formation of a polymer can prevent further pyrolysis carbonization layer, on the other hand can prevent the internal thermal decomposition products into gas phase combustion process in biological.

3) inhibition of chain reaction

According to the combustion of the chain reaction theory, to maintain the desired combustion is radical. Flame retardant effect in gas phase combustion zone, capture the combustion reaction of free radicals, thereby preventing the spread of flame, the combustion zone of the flame density decreased, eventually make the combustion reaction rate decreased until termination.

Such as halogen flame retardant, the evaporation temperature and decomposition temperature of polymer with the same or similar, when the polymer is heated to decompose, flame retardant and volatilization. The halogen containing flame retardant and thermal decomposition products at the same time in the gas phase combustion zone, halogen can capture the combustion reaction of free radicals, thereby preventing the spread of flame, the combustion zone of the flame density decreased, eventually make the combustion reaction rate decreased until termination.

4) no burning gas suffocation

Flame retardant heat decomposition of combustible gas, the combustible gas concentration will break out of fuel into the combustion limit following dilution. At the same time also has a dilution effect on the combustion of oxygen concentration in the region, to continue to stop burning, flame retardant effect.