Magnesium hydroxideWhen heated, it will decompose and absorb the heat of the surface of the combustion substance to the flame retardant effect. At the same time, a large amount of water is released to dilute the oxygen on the surface of the combustion substance. The active magnesium oxide generated by decomposition adheres to the surface of the combustible substance and further prevents the combustion.
Magnesium hydroxide is a new type of filled flame retardant. It can reduce the surface temperature of the filled synthetic material in the flame by releasing bound water and absorbing a large amount of latent heat when it is decomposed by heat, which can inhibit the decomposition of polymer and cool the combustible gas.
Magnesium oxide generated by the thermal decomposition of magnesium hydroxide is a good refractory material, which can also help improve the fire resistance of synthetic materials. At the same time, the water vapor released during its decomposition also has a smoke suppression effect. Therefore, magnesium hydroxide is recognized as an excellent flame retardant with flame retardant, smoke suppression and filling triple function in the rubber and plastic industry.
In addition to the impact on the environment, compared with magnesium hydroxide and aluminum hydroxide, in the thermal reaction, decomposition temperature, applicable polymer, flame retardant ability, smoke suppression ability, stability to acid, magnesium hydroxide flame retardant is better than aluminum hydroxide flame retardant, but also better than the traditional halogen, phosphorus flame retardant.
The thermal decomposition temperature of magnesium hydroxide is 330 ° C., which is 100 ° C. higher than that of aluminum hydroxide. Therefore, plastics filled with magnesium hydroxide flame retardant can withstand higher processing temperatures, because increasing the processing temperature during plastic processing is beneficial to accelerate the extrusion speed and shorten the molding time.