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What is the flame retardant principle of halogen-free flame retardant phenolic resin softener?

Publish Time: 2024-02-04
The flame retardant principle of halogen-free flame retardant phenolic resin softener mainly involves the following aspects:
Endothermic effect: When the fire source comes into contact with the flame retardant, the flame retardant will absorb part of the heat and reduce the temperature of the flame, thereby inhibiting the continuation of combustion.
Covering effect: halogen-free flame retardant phenolic resin softener can form a glassy or stable foam covering layer at high temperatures. This covering layer can isolate oxygen and prevent the leakage of flammable gases, thereby effectively inhibiting combustion.
Inhibition of chain reactions: Halogen is a free radical scavenger in combustion reactions. Halogen-free flame retardant phenolic resin softener inhibits combustion chain reactions in other ways, thereby achieving flame retardant effects.
Gas production: Some halogen-free flame retardant phenolic resin softeners will release gases such as CO2, NH3, N2 and other gases when heated. These gases can dilute the oxygen in the air, thereby reducing the intensity of combustion.
Carbonization: Some halogen-free flame retardant phenolic resin softeners can cause the polymer to form a char layer when heated. This char layer has a stable structure and can prevent further pyrolysis and vaporization of the polymer, thereby inhibiting combustion.
The role of metal hydroxides: Some halogen-free flame retardant phenolic resin softeners contain metal hydroxides. These substances will release water vapor during the combustion process, while absorbing a large amount of heat, lowering the temperature of the polymer surface, thereby inhibiting combustion.
In summary, halogen-free flame retardant phenolic resin softener works synergistically through multiple mechanisms to effectively inhibit the propagation of flames and the burning of polymers. This multi-mechanism flame retardant method gives halogen-free flame retardant phenolic resin softener significant advantages in terms of material fire safety.
Please note that the flame retardant effect of halogen-free flame retardant phenolic resin softener is affected by many factors, including polymer type, processing conditions, flame retardant dosage and mixing ratio, etc. Therefore, in practical applications, it is necessary to select the appropriate halogen-free flame retardant phenolic resin softener according to the specific situation.
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