Flame retardant mechanism of magnesium hydroxide

Magnesium hydroxide undergoes decomposition and absorption of surface heat from combustion materials when heated (340-490 degrees Celsius), resulting in flame retardancy; At the same time, a large amount of water is released to dilute the oxygen on the surface of the combustibles, and the active magnesium oxide generated by decomposition adheres to the surface of the combustibles, further preventing combustion. Magnesium hydroxide not only does not produce any harmful substances during the entire flame retardant process, but its decomposed products can also absorb a large amount of harmful gases and smoke generated by the combustion of polymers such as rubber and plastic. Active magnesium oxide continuously absorbs incomplete combustion residue, eliminating smoke and preventing droplet formation while quickly stopping combustion. It is an emerging environmentally friendly inorganic flame retardant. classification
Flame retardants can be divided into two categories based on their chemical composition: organic flame retardants and inorganic flame retardants. Organic flame retardants are further divided into two series: phosphorus series and halogen series. Due to the drawbacks of organic flame retardants such as high toxicity of decomposition products and high smoke, they are gradually being replaced by inorganic flame retardants.
The main varieties of inorganic flame retardants include aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, tin oxide, molybdenum oxide, ammonium molybdate, zinc borate, etc. Among them, aluminum hydroxide and magnesium hydroxide can absorb heat due to decomposition and produce H2O, which can isolate the air. After decomposition, the oxide is also a high-temperature resistant substance. Therefore, the two flame retardants not only have a flame retardant effect, but also can play a filling role, It has the characteristics of not producing corrosive halogens and harmful gases, not volatilizing, long-lasting effect, non-toxic, smokeless, and non dripping.