Performance comparison of magnesium hydroxide aluminum hydroxide flame retardant

Magnesium hydroxide aluminum hydroxide are two different flame retardants. In addition to the considerable impact on the environment, these two flame retardants are in many aspects such as thermal reaction, decomposition temperature, applicable polymer, flame retardant ability, etc. There is a clear contrast, the performance of magnesium hydroxide flame retardants are better than aluminum hydroxide flame retardants. This article will compare the following 7 aspects:

(1) The thermal decomposition temperature of magnesium hydroxide is 320℃, which is higher than the thermal decomposition temperature of aluminum hydroxide is 180C℃, so plastics filled with magnesium hydroxide flame retardant can withstand higher processing temperatures. Because increasing the processing temperature during plastic processing is beneficial to speed up the extrusion speed shorten the molding time, so when the processing temperature of the material is higher than 180 ℃, magnesium hydroxide can only be used.

(2) The decomposition energy of magnesium hydroxide (1.37KJ/g) is higher than that of aluminum hydroxide (1.17KJ/g), the heat capacity is also 17% higher, which helps to improve the flame retardant efficiency.

(3) The hardness of magnesium hydroxide particles is smaller than that of aluminum hydroxide, so the friction to the equipment is small, which is beneficial to extend the life of the production equipment.

(4) Magnesium hydroxide has a strong carbonization effect a large carbonization amount, thus improving the flame retardant efficiency reducing the amount of smoke produced.

(5) The thermal decomposition product of magnesium hydroxide is MgO, its neutralizing ability with acid is stronger than that of aluminum hydroxide, Al2O3, can quickly neutralize the acidic corrosive gases generated during the plastic combustion process ( SO2, NO2, CO2, etc.).

(6) The smoke suppression ability of magnesium hydroxide is stronger than that of aluminum hydroxide. In EPDM resin, 75% magnesium hydroxide flame retardant 25% aluminum hydroxide flame retardant are mixed filled together with aluminum hydroxide. Compared with flame retardants, the former's smoke production is significantly reduced.

(7) With the improvement of the production process, the technology for producing magnesium hydroxide flame retardant using bittern as raw material is becoming mature, its production cost will be greatly reduced. Therefore, the advantages of magnesium hydroxide flame retardants are obvious, there is a tendency to replace aluminum hydroxide.