Improving the flame retardant efficiency of magnesium hydroxide

Magnesium hydroxide white fine powder, water-soluble and alkaline, easy to absorb CO2 in the air. Magnesium hydroxide has a relative density of 2.37 and belongs to the hexagonal crystal system, with a refractive index of 1.561-1.581.

           Magnesium hydroxide white fine powder, water-soluble and alkaline, easy to absorb CO2 in the air. Magnesium hydroxide has a relative density of 2.37 and belongs to the hexagonal crystal system, with a refractive index of 1.561-1.581. The decomposition temperature of magnesium hydroxide: at 340 ℃, it can lose adsorbed water and transform into magnesium oxide above 500 ℃. When the temperature exceeds 340 ℃, it decomposes into magnesium oxide (MgO) and water (H2O), thus possessing flame retardant properties.
           Adding synergistic flame retardants can effectively improve the flame retardant efficiency of magnesium hydroxide, reduce the amount of flame retardants used and the phenomenon of molten droplets during polymer combustion; And it can improve the mechanical properties of flame retardant materials to a certain extent. Common magnesium hydroxide flame retardants include aluminum hydroxide, organic silicides, red phosphorus and phosphides, zinc borate, melamine cyanate, graphite, layered metal double hydroxides, as well as organic clay, rubber, multi walled carbon nanotubes, etc.
           The ultrafine refinement of magnesium hydroxide directly affects the mechanical and flame retardant properties of polymers. By increasing the specific surface area, compatibility can be improved, making the flame retardant evenly dispersed in the matrix material and enhancing its flame retardant performance.
             Synergistic agent for improving the flame retardant efficiency of aluminum hydroxide: alkaline earth metal hydroxide. Alkaline earth metal hydroxides mainly refer to Mg (OH) 2. The decomposition temperature of ATH is 200 ℃, and the decomposition temperature of Mg (OH) 2 is 430 ℃. By organically combining ATH and Mg (OH) 2 through certain methods, it can simultaneously exhibit the comprehensive flame retardant effect of ATH and Mg (OH) 2, significantly increasing the flame retardant temperature, increasing heat absorption, reducing filling amount, thereby improving the flame retardant efficiency and greatly improving the physical properties of the polymer. A composite flame retardant of ATH and Mg (OH) 2 was prepared by chemical co precipitation method. After testing, the heat resistance decomposition temperature was significantly increased, and its particle size and dispersion were improved.