Magnesium hydroxideFlame retardant does not contain bromine, chlorine and other halogen elements, has a good flame retardant smoke suppression effect, plastic, rubber and other polymer materials ideal low smoke halogen-free filled flame retardant. Since the decomposition temperature of magnesium hydroxide reaches 340 ℃, it is suitable for PP, PE, ABS, EVA and other products with high molding temperature. In the wire and cable flame retardant insulation materials and sheath materials, fire filler, injection molding color masterbatch, etc. are widely used.
Magnesium hydroxide is a kind of inorganic flame retardant and smoke suppression agent with high filling amount and addition type. The flame retardant mechanism is that when magnesium hydroxide is heated at 340-490 ℃, it decomposes and absorbs the surface heat of the combustion substance to achieve 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, and the active magnesium oxide generated by decomposition will adhere to the surface of the combustible substance to further prevent the combustion. In the whole flame retardant process, magnesium hydroxide does not produce harmful substances, and the decomposed products can absorb a large number of harmful gases and smoke generated by the combustion of plastics, rubber and other polymers while being flame retardant. Active magnesium oxide continuously absorbs the melting residue of incomplete combustion, which can quickly prevent combustion, remove smoke and prevent molten droplets. It is a new environmentally friendly inorganic flame retardant.
Magnesium hydroxide is more conducive to the increase of plastic processing temperature, accelerate the extrusion speed and shorten the molding time. At the same time, magnesium hydroxide has high decomposition energy, which helps to absorb combustion heat and improve flame retardant efficiency. Therefore, compared with aluminum hydroxide, it has obvious advantages. With the increase of polymer processing temperature, the flame retardant effect of aluminum hydroxide, which is easy to decompose, will decrease.