Flame retardant Mechanism and Classification of magnesium hydroxide Flame retardant
With the development of polymer material industry, there are more and more fiber, resin, chemical, construction, transportation, rubber and other synthetic materials, but most polymers are flammable materials. In many application fields, in order to prevent fire, flame retardants need to be added to polymer materials. Magnesium hydroxide is an important inorganic flame retardant, which has many advantages, such as good thermal stability, non-volatilization, no precipitation, no toxic gas, no pollution and so on. Magnesium hydroxide is a green and environmentally friendly flame retardant, which is widely used in plastics, rubber, flame retardant, smoke and resin polymer materials.
Magnesium hydroxide, as a new type of filled flame retardant, releases bound water and absorbs a large amount of latent heat during thermal decomposition to reduce the surface temperature of the synthetic material filled with magnesium hydroxide in the flame, which can inhibit the decomposition of polymer and cool the combustible gas produced. Next, I will introduce the flame retardant mechanism of magnesium hydroxide flame retardant.
When heated (340 ≤ 490 degrees), magnesium hydroxide decomposes and absorbs the surface heat of combustion material to flame retardant, at the same time releases a large amount of water to dilute the oxygen on the surface of fuel, and the active magnesium oxide formed by decomposition is attached to the surface of combustible matter, which further prevents the combustion from going on. Magnesium hydroxide is not only not produced by any harmful substances in the whole flame retardant process, but also can absorb a large number of harmful gases and fumes produced by the combustion of rubber, plastics and other polymers at the same time of flame retardant. Active magnesium oxide continuously absorbs the melting residues of incomplete combustion, eliminates the smoke and prevents the droplets from causing the combustion to stop quickly. A new environment-friendly inorganic flame retardant.
The flame retardant can be divided into an organic flame retardant and an inorganic flame-retardant according to the chemical composition. The organic flame retardant is also divided into two series of phosphorus and halogen series. As the organic flame retardant has the defects of large decomposition product toxicity and large smoke, the organic flame retardant is gradually replaced by the inorganic flame retardant.
The magnesium hydroxide decomposes and absorbs the heat of the surface of the combustion object to the flame-retardant effect when the magnesium hydroxide is heated, and simultaneously releases the oxygen in the surface of the large amount of water to dilute the surface of the combustible substance, and the generated active magnesium oxide is attached to the surface of the combustible material and further prevents the combustion. the magnesium hydroxide is free of harmful substances in the flame-retardant process of the magnesium hydroxide, It is a new kind of environment-friendly inorganic flame retardant to avoid the smoke and prevent the droplet from being stopped quickly.