In daily life, we often hear the term "flame retardant", a flame retardant, a functional additive that imparts flame retardancy to flammable polymers, mainly for the flame retardant design of polymer materials, but the resistance The understanding of the fuel is mostly at the level of “fire preventionâ€, but its principle of fire prevention is not very clear.
1. Providing a coating that is isolated from oxygen. For example, the phosphide produced by the combustion of a phosphate flame retardant is an oxygen barrier coating.
Second, the formation of free radicals that can react with plastics, which play a flame retardant role, and their reaction products with plastics have extremely poor combustion properties.
3. Absorbing the heat generated during combustion, and cooling to slow down the burning rate, such as aluminum hydroxide, the proportion of chemical association water contained in the molecule is as high as 34%, and the association water is processed at most plastics. It remains stable, but begins to decompose when it exceeds 200 ° C, releasing water vapor, and absorbs 36 kcal of heat per decomposed of one mole of aluminum hydroxide.
4. Producing a gas capable of smoldering the flame, such as antimony trioxide, which reacts with HCL generated by combustion in pvc to form a suffocating gas, that is, nitrogen oxides of antimony.
The plastic flame retardant is not just as simple as fire retardant. In addition, many of the above substances are produced, and finally the purpose of preventing plastic burning is achieved.
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