Gas phase flame retardant mechanism

The gas phase flame retardant system refers to the flame retardant effect that interrupts the combustion or delays the chain combustion reaction in the gas phase. The flame retardant in the following situations is all gas phase flame retardant.

(1) Flame retardant materials can produce free radical inhibitors when heated or burned, which interrupts the combustion chain reaction.

(2) Flame-retardant materials generate fine particles when heated or burned, and they can promote free radicals to combine with each other to stop the chain combustion reaction.

(3) Flame-retardant materials release a large amount of inert gas or high-density vapor when heated or burned. The former can dilute oxygen and gaseous combustibles and reduce the temperature of the combustible gas, causing the combustion to cease; the latter covers the combustible gas. , Isolate it from contact with the air, thus suffocating the combustion. Volatile, low-boiling phosphorus-containing compounds, such as trialkyl phosphorus oxide (R3PO), belong to gas phase flame retardants. Mass spectrometry analysis shows that triphenylphosphonate and triphenylphosphine are broken into free radical fragments in the flame. These free radicals trap H· and O· radicals like halides, thereby inhibiting the combustion chain reaction effect.

In the combustion and cracking of red phosphorus, P· is also formed, and they react with oxygen in the polymer to form a phosphate structure. In addition, the intumescent flame retardant system may also play a role in the gas phase. The amine compounds in it can decompose to produce NH3, H2O and NO when heated. The first two gases can dilute the oxygen concentration in the flame zone, and the latter can make the combustion depend on. The radicals are quenched, causing the chain reaction to terminate.

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Shawn

Regional Sales Manager

Zhejiang Ruico Advanced Materials Co., Ltd. (Stock No.873233)

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