Aluminum hydroxide and magnesium hydroxide are two of the most important inorganic flame retardants. Their common characteristics are environment-friendly, flame-retardant, smoke suppression and filling functions. Aluminum hydroxide is one of the earliest inorganic flame retardants. As a flame retardant, aluminum hydroxide has the characteristics of good stability, non-toxic, non corrosive gas, long flame retardant effect, and high whiteness. Magnesium hydroxide flame retardant is a kind of inorganic flame retardant which is being actively developed at home and abroad. In addition to the above advantages of aluminum hydroxide, it is thermally stable Magnesium hydroxide is superior to aluminum hydroxide in terms of its properties of anti smoke and anti smoke. The dehydration of magnesium hydroxide occurs only when the temperature is above 350 ℃, and the heat absorption capacity of magnesium hydroxide is 17% higher than that of aluminum hydroxide, which also helps to improve the flame-retardant efficiency. At the same time, magnesium hydroxide is more suitable for processing polymers with high temperature. It can be seen that different flame retardants have different characteristics and uses.

At present, there is a large amount of aluminum hydroxide in China, but with the increase of polymer processing temperature, aluminum hydroxide is easy to decompose and reduce the flame retardant effect. Compared with aluminum hydroxide, magnesium hydroxide has the following advantages:

1. The thermal decomposition temperature of magnesium hydroxide reaches 330 ℃, which is 100 ℃ higher than that of aluminum hydroxide, so it is beneficial to improve the processing temperature of plastics, accelerate the extrusion speed and shorten the molding time. The product has high glossiness, no surface defects, and high peeling strength.

2. The magnesium oxide produced after combustion and dehydration of magnesium hydroxide is a kind of high-strength and heat-resistant material, which can be used as a protective wall to isolate the fire source and toxic and harmful gases. The neutralization ability of magnesium hydroxide and acid is strong, and it can neutralize the acid gases SO2, NOx, CO2, etc. produced in the process of plastic combustion quickly.

3. The decomposition energy of magnesium hydroxide is high, which is good for absorbing the heat of combustion and improving the efficiency of flame retardant.

4. Magnesium hydroxide has strong smoke suppression ability, small hardness and small friction to equipment, which is helpful to prolong the life of production equipment.

5. Magnesium hydroxide is half of the price of aluminum hydroxide, with large filling volume.