What are the flame-retardant methods for selecting PP flame-retardant plates?

1. Bromine-Antimony System

Commonly, antimony trioxide is used in combination with bromine-based flame retardants. The mechanism is that antimony trioxide reacts with bromides, and finally, antimony chloride is generated through thermal decomposition. Antimony chloride can stay in the combustion zone for a long time, isolating the air and playing a role in flame retardancy. Secondly, antimony chloride can capture flammable free radicals, suppressing the flame. Thirdly, antimony chloride condenses into liquid droplets or solid particles, which can absorb a large amount of heat, slowing down or stopping the combustion rate and achieving the purpose of flame retardancy.

2. Phosphorus-Nitrogen System

The flame retardancy mechanism of the phosphorus-nitrogen system flame retardant is that through thermal decomposition, phosphoric acid and non-combustible gases are released. The latter can isolate oxygen around the flame. Phosphoric acid can catalyze surface coking, promoting the formation of a porous coking layer on the combustion surface, which plays a role in heat insulation and oxygen isolation, thus achieving flame retardancy.

3. Composite System

Multiple flame retardants are used, and they cooperate in flame retardancy from multiple angles to achieve the goal of flame retardancy.