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Reaction Mechanism of Halogen-free Flame Retardants


Release time:

Jul 27,2021

[Summary]The flame retardant effect of inorganic flame retardants is mainly to use the heat storage and thermal conductivity of large specific volume fillers to make it difficult for the material to reach the decomposition temperature, or to alleviate or terminate the heating process of the bulk material through the thermal decomposition of halogen-free flame retardants. The flame retardant mechanism is to release crystal water, evaporate, decompose and release water vapor when heated.

The flame retardant effect of inorganic flame retardants is mainly to use the heat storage and thermal conductivity of large specific volume fillers to make it difficult for the material to reach the decomposition temperature, or through.halogen-free flame retardantThe thermal decomposition of heat absorption, alleviate or terminate the heating process of the body material, the flame retardant mechanism is to release crystal water when heated, evaporation, decomposition, release water vapor.

This reaction process needs to absorb a large amount of combustion heat, which greatly reduces the surface temperature of the material and greatly reduces the thermal decomposition combustion probability of the polymer material.

Halogen-free flame retardants are one of the most widely produced organic halogen-free flame retardants in the world. Commonly used halogen-free flame retardants are bromine-containing and chlorine-containing halogen-free flame retardants.

Halogen-free flame retardants are mostly organic and have good compatibility with major polymer materials. Halogen-based halogen-free flame retardants as flame retardant additives will not affect the physical and chemical properties of polymer materials themselves. In addition, the halogen-based halogen-free flame retardant can meet the requirements of a small amount of addition, but can achieve a good flame retardant effect.

The bromine-containing halogen-free flame retardant includes bromine-containing compounds such as aliphatic, alicyclic, and aromatic compounds. Commonly used are decabromodiphenyl ether, decabromodiphenyl ethane, tetrabromodiphenol a, etc., chlorine-containing halogen-free flame retardants are mainly chlorinated paraffins.

The flame retardant mechanism of bromine and chlorine is similar: at high temperature, it can cut the carbon halogen bond in the halogen-free flame retardant, release halogen radicals, and effectively capture the active radicals produced by the thermal decomposition of the polymer Material, effectively reduce the concentration of free radicals, alleviate the combustion of free radical chain reaction.

In addition, the halogen released by the decomposition of halogen-free flame retardants is non-flammable, effectively blocking oxygen and preventing combustion reactions.

However, if a polymer material containing a halogen-free halogen-free flame retardant is burned, a large amount of halogen gas is generated. This gas is toxic and corrosive. At the same time, it is easy to absorb moisture in the air, forming a corrosive halogen acid. A large number of smoke, these smoke, toxic gases and corrosive gases endanger human health


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