What are the advantages

What are the advantages of nano magnesium hydroxide flame retardant? The main varieties of inorganic flame retardants are aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, tin oxide, molybdenum oxide, ammonium molybdate, zinc borate, etc. Among them, aluminum hydroxide and magnesium hydroxide can isolate the air because of their large heat absorption and H2O production, and their decomposed oxides are high-temperature resistant substances. Therefore, the two flame retardants can not only play a flame retardant role, but also play a filling role. They have the advantages of no corrosive halogen gas and harmful gas, no volatilization, long-lasting effect. Magnesium hydroxide decomposes when heated (340-490℃) to absorb the surface heat of combustion products and achieve flame retardant effect; At the same time, a large amount of water is released to dilute the oxygen on the surface of the fuel, and the active magnesium oxide generated by decomposition adheres to the surface of the fuel, which further prevents the combustion. Magnesium hydroxide not only does not produce any harmful substances in the whole flame retardant process, but also its decomposed products can absorb a large amount of harmful gases and smoke generated by the burning of rubber, plastic and other polymers. Active magnesium oxide continuously absorbs the incomplete burning molten residue, which can eliminate smoke and prevent molten drops while stopping the burning quickly. It is a new environmental-friendly inorganic flame retardant. Magnesium hydroxide flame retardant releases bound water and absorbs a large amount of latent heat when it is decomposed by heat, so as to reduce the surface temperature of the synthetic material filled by it in the flame, and it can inhibit the decomposition of polymer and cool the generated combustible gas. Magnesium hydroxide is a white solid powder, insoluble in alkaline substances, and decomposed into magnesium oxide and water when heated. When heated to 340℃, it began to decompose, with the fastest decomposition rate at 430℃ and complete decomposition at 490℃. Magnesium hydroxide crystal belongs to bivalent metal hydrate family, and its crystal structure is layered CdI2 type, which forms a continuous hexagon. Mg2+ layer and OH- layer overlap each other, and each magnesium ion is coordinated by six hydroxide ions to form Mg(OH)6 octahedron. Magnesium hydroxide has many advantages: (1) The decomposition temperature of magnesium hydroxide is 340℃-490℃, which can make the added material bear higher processing temperature, which is conducive to speeding up the extrusion speed and shortening the molding time. Moreover, magnesium hydroxide has larger decomposition energy, high heat capacity, can absorb more heat, and has better flame retardant effect. (2) Magnesium hydroxide has small particle size and little wear on material processing equipment, which is conducive to prolonging the service life of equipment. (3) Magnesium hydroxide has good smoke reduction effect, and can neutralize toxic gases such as sulfur dioxide and carbon dioxide produced by polymer combustion. (4) The raw materials are abundant and easily available. There are a lot of magnesium salts in seawater resources, as well as magnesium minerals such as magnesite, dolomite and brucite.