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Do you know these knowledge of halogen-free flame retardants?


Release time:

Sep 03,2021

[Summary]With the advancement of science and technology, halogen-free flame retardants have also developed. Because halogen-free flame retardants are based on phosphorus compounds and metal hydroxides, they emit a small amount of smoke when burned, and do not produce non-toxic and corrosive. Non-polluting flame retardants are called non-polluting flame retardants, so they are particularly loved by many industries. Here to introduce the relevant knowledge of halogen-free flame retardants.

With the progress of science and technology,halogen-free flame retardantAs a result, halogen-free flame retardants are based on phosphorus compounds and metal hydroxides, they emit a small amount of smoke when burning, and do not produce non-toxic and corrosive non-polluting flame retardants, which are called non-polluting flame retardants. Therefore, it is particularly loved by many industries. Here to introduce the relevant knowledge of halogen-free flame retardants.

Heat absorption effect: We know that the heat of anything burning is limited. Flame retardants will react under high temperature conditions, absorb part of the heat released by combustible materials, reduce the surface temperature of combustible materials, effectively prevent the generation of combustible gases and prevent the spread of combustion. This flame retardant gives full play to the characteristics of absorbing a large amount of heat when combined with water vapor, and improves its flame retardant ability.

Covering effect: after adding flame retardant to combustible materials, it can form a glass-like or foam-like covering layer at high temperature, which has the functions of heat insulation, oxygen insulation and preventing combustible gas from escaping outward, so as to achieve the purpose of flame retardant. For example, organophosphorus-inhibited flame retardants produce a solid substance or carbonized layer upon heating. The formation of the carbonized layer can not only prevent the further pyrolysis of the polymer, but also prevent the thermal decomposition products from entering the gas phase to participate in the combustion process.

Inhibit chain reaction: flame retardant can act on the gas phase combustion zone, capture the free radicals in the combustion reaction, thus preventing the flame from spreading and reducing the combustion reaction speed until it stops. For example, halogen-containing flame retardant, whose evaporation temperature is the same as or close to the decomposition temperature of the polymer, when the polymer is decomposed by heat, the flame retardant also volatilizes at the same time, and halogen can capture the free radicals in the combustion reaction, thus preventing fire from burning.

Non-combustible gas asphyxiation effect: flame retardants can decompose non-combustible gases during combustion. These non-combustible gases can dilute the concentration of combustible gases, and at the same time dilute the oxygen concentration in the combustion zone to prevent the combustion from continuing to achieve the flame retardant effect.


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