Due to the low bond energy of the C—Br bond, most bromine-based flame retardants will decompose at 200-300℃. This temperature range is also the decomposition temperature range of polypropylene. Therefore, when polypropylene is thermally decomposed, bromine-based flame retardants will decompose. The fuel also begins to decompose, and can capture the free radicals generated by the degradation reaction of polypropylene, thereby delaying or terminating the chain reaction of combustion.
Brominated flame retardants will release HBr at the same time when they are decomposed. This is a kind of flame-retardant gas. This gas has a high density and can cover the surface of the material to block the surface combustible gas and inhibit the burning of the material. This kind of flame retardant can also be used in combination with other compounds (such as antimony trioxide), which can significantly improve the flame retardant effect through synergistic effects.
Brominated flame retardants play an important role in the flame retardant application of polypropylene. The main products are decabromodiphenylethane, tetrabromobisphenol A-bis(2,3-dibromopropyl ether), and decabromodiphenyl ether. , Tetrabromobisphenol A, brominated polystyrene, hexabromocyclododecane, etc.
The main disadvantage of brominated flame retardants is to reduce the anti-ultraviolet stability of the flame-retardant substrate, and generate more smoke, corrosive gas and toxic gas during combustion, which limits their application. In addition, the relatively high price of brominated flame retardants is also an important factor restricting their use.
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