The principle of aluminum hydroxide as a flame retardant

The principle of aluminum hydroxide as a flame retardant

1. Aluminum hydroxide flame retardant, referred to as ATH. The principle of the flame retardant is: when aluminum hydroxide is heated and decomposed, it will release crystal water. The process is a strong endothermic reaction, which absorbs a large amount of heat and can cool the polymer. At the same time, the water vapor produced by the reaction can dilute the combustible gas and inhibit the spread of combustion.

2. The new refractory metal oxide Al2O3 has high activity. It will catalyze the thermal oxygen cross-linking reaction of the polymer and form a carbonized film on the surface of the polymer. The carbonized film will weaken the heat and mass transfer effects during combustion. , So as to play a flame retardant effect. Al2O3 can also adsorb soot particles and play a role in suppressing smoke.

3. The chemical formula of aluminum hydroxide is Al(OH)3, which is the hydroxide of aluminum. Aluminum hydroxide can react with acid to form salt and water, and it can also react with strong base to form salt and water, so it is an amphoteric hydroxide. Because it shows a certain degree of acidity, it is also called aluminate (H3AlO3).