Do you know how flame retardants are "fireproof"?
- time:
- 2019-05-11
In our daily life, we often hear the term "flame retardant", but the understanding of flame retardant mostly stays at the level of "fire prevention", but the principle of fire prevention is not very clear. Next, let's understand the flame retardant mechanism of flame retardants.
1. Provide a layer of oxygen-insulated coating, such as phosphide formed during combustion of phosphate flame retardants, which is oxygen-insulated coating.
2. Formation of free radicals which can react with plastics and play a flame retardant role. Their combustion performance with the reaction products of plastics is very poor.
3. Produce a kind of gas that can smother the flame, such as antimony trioxide. When it meets HCL emitted by combustion in PVC, it reacts to produce a smothering gas, i.e. antimony nitrogen oxide.
4. Absorbing the heat generated during combustion can slow down the burning rate by cooling. For example, aluminium hydroxide, which contains 34% of the chemical association water in the molecule, remains stable at most plastic processing temperatures, but begins to decompose at more than 200 degrees C, releasing water vapor, and absorbs 36 kilocalories per gram of molecule aluminium hydroxide decomposed.
