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Do you know all these knowledge of flame retardants?
Release time:
2024-01-16
With the progress of science and technology, flame retardants have also been developed. Because the flame retardant is based on phosphorus compounds and metal hydroxides, it releases a small amount of smoke when burning, and does not produce non-toxic, corrosive and non-dyeing flame retardants called non-dyeing flame retardants, which are especially popular in many industries. The following is the relevant knowledge of flame retardants.
With the progress of science and technology, flame retardants have also been developed. Because the flame retardant is based on phosphorus compounds and metal hydroxides, it releases a small amount of smoke when burning, and does not produce non-toxic, corrosive and non-dyeing flame retardants called non-dyeing flame retardants, which are especially popular in many industries. The following is the relevant knowledge of flame retardants.
Heat absorption effect: We know that any combustion heat is limited. Under high temperature conditions, flame retardants absorb part of the heat, reduce the surface temperature of combustible materials, effectively prevent combustible gases and prevent the spread of combustion. Flame retardants give full play to the characteristics of water vapor absorbing a large amount of heat, Improve its flame retardant ability.
Covering function: After adding flame retardant to combustible materials, a glass or foam covering layer can be formed at high temperatures, which has the functions of heat insulation, oxygen insulation, and prevention of combustible gas escape, so as to achieve the purpose of flame retardant. For example, organophosphorus-inhibiting flame retardants produce a solid mass or carbonized layer during heating. The formation of the carbonized layer can not only prevent further pyrolysis of the polymer, but also prevent the thermal decomposition products from entering the gas phase to participate in the combustion process.
Inhibitory chain reaction: flame retardant can act on the gas phase combustion zone, capture the free radicals in the combustion reaction, prevent the flame from spreading, and reduce the combustion reaction speed until it stops. For example, the evaporation temperature of the halogen-containing flame retardant is the same as or similar to the decomposition temperature of the polymer. When the polymer is heated to decompose, the flame retardant will also volatilize, and the halogen can trap free radicals in the combustion reaction, thereby preventing fire combustion.
The non-combustible gas suffocation effect: the flame retardant can decompose the non-combustible gas, dilute the concentration of combustible gas, dilute the oxygen concentration in the combustion zone, prevent continued combustion, and achieve the flame retardant effect.
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