Mechanism of flame retardant resin

General combustion must meet three conditions:

① There are combustible substances.

②The temperature reaches the ignition point.

③There is sufficient oxygen. As long as one of them is missing, the fire will go out. Yes, flame retardant can be carried out in the following ways.

1. An endothermic reaction occurs on the surface to produce a cooling effect
The flame retardant may undergo endothermic decomposition or endothermic reaction with the substrate, reducing the temperature below the temperature required for the flame to maintain its chain reaction; or the free radicals or molecules generated by the decomposition of the flame retardant can interact with the The substance reacts endothermically, thereby interfering with the heat balance of combustion.
2. Generate non-flammable gas
On the one hand, the generation of non-combustible gas can remove oxygen from the surface of the polymer; on the other hand, it dilutes the combustible gas and makes the decomposition and combustion proceed in the direction of producing non-combustible gas.
3. A carbonized layer is formed on the surface
The carbonization layer produced on the surface can cut off air, heat, etc., prevent the interdiffusion of flammable substances and oxygen, and at the same time prevent the polymer from getting enough heat to decompose, reducing the speed of "fuel" generation.
4. Inhibition of flammable gas products
Because phosphate, etc., have the effect of promoting carbonization, the generation of flammable gas is inhibited.
5. Generate a relatively dense gas
The gas with high relative density can hinder the exchange of combustion gas and air.

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