The flame retardant principle of flame retardant masterbatch. The flame retardant principle of plastic flame retardant. The flame retardant principle of plastic flame retardant:
1. Produce a gas that can suffocate the flame. . For example, antimony trioxide, when it encounters HCL produced by combustion in PVC, can react with it to form a suffocating gas, namely antimony nitrogen oxide, thus achieving a flame retardant effect.
2. Absorb the heat generated during combustion to cool and slow down the burning rate. For example, aluminum hydroxide contains chemically bound water in its molecules as high as 34%. This bound water remains stable at the processing temperatures of most plastics, but begins to decompose when it exceeds 200°C, releasing water vapor. And for every molecule of aluminum hydroxide decomposed, 36 kcal of heat is absorbed.
3. Provide an isolation layer that is isolated from oxygen. It is self-extinguishing due to the isolation of oxygen. For example, the phosphide generated when phosphate flame retardants are burned is an oxygen isolation layer.
4. Generate free radicals that can react with plastics, and their reaction products with plastics can act as flame retardants.
According to the flame retardant principle, flame retardant masterbatch (flame retardant masterbatch) is divided into absorption type, isolation line and reactive type.
According to the flame retardant level, it is divided into UL94: V0, V1, V2, HB, etc.
According to the basic masterbatch of flame retardant masterbatch: PE addition, PP addition, ABS addition, etc.
According to the elemental composition of flame retardant masterbatch: divided into halogen series (such as bromine series), phosphorus series, nitrogen series expansion type, inorganic series (magnesium hydroxide, aluminum hydroxide), and mutual combination systems .
According to the functional masterbatch items, flame retardant film. Electrical appliance bushings, mining pipes, construction safety nets. etc.