Does magnesium hydroxide make flame retardant principle?


May 30,2022



Magnesium hydroxide is an inorganic substance, chemical formula is Mg (OH) 2, white amorphous powder or colorless hexagonal column crystal.
Magnesium hydroxide is a new type of filled flame retardant. The decomposed magnesium oxide is a good refractory, which can also help improve the fire resistance of synthetic materials. At the same time, the water vapor it emits can also be used as a smoke suppressant. Magnesium hydroxide is recognized as an excellent flame retardant with triple functions of flame retardancy, smoke suppression and filling in the rubber and plastic industry. It is widely used in rubber, chemical industry, building materials, plastics, electronics, coatings and other polymer materials.
What is the flame retardant mechanism of magnesium hydroxide?
When heated (340-490 ℃), magnesium hydroxide decomposes and absorbs surface heat of combustor to achieve flame retardancy; At the same time, a large amount of water is released to dilute the oxygen on the surface of the fuel, and the active magnesium oxide generated from decomposition is attached to the surface of the fuel, which further prevents the combustion. In the whole flame retardant process, magnesium hydroxide not only does not produce any harmful substances, but also its decomposition products can absorb a large amount of harmful gases and smoke generated by the burning of rubber, plastics and other macromolecules while flame retardant. Active magnesium oxide continuously absorbs the incomplete burning fusion residues, which can eliminate smoke and prevent droplets while stopping combustion quickly. It is a new environment-friendly inorganic flame retardant.
Compared with similar inorganic flame retardants, magnesium hydroxide has better smoke suppression effect. Magnesium hydroxide has no harmful substances discharged in the production, use and waste process, and can neutralize the gas generated in the combustion process.