What is the Flame retardant Mechanism of magnesium hydroxide Flame retardant
Magnesium hydroxide flame retardant is a new type of filled flame retardant. By releasing bound water and absorbing a lot of latent heat during thermal decomposition, magnesium hydroxide flame retardant can reduce the surface temperature of the synthetic material filled with it in the flame, and can inhibit the decomposition of polymer and cool the combustible gas produced.
When the magnesium hydroxide is heated (340-490 DEG C), the heat of the surface of the combustion object is absorbed to the flame-retardant effect; meanwhile, the oxygen in the surface of a large amount of water is released 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 not only produced by any harmful substance in the whole flame-retardant process, but also the decomposed product can absorb the harmful gas and smoke generated by high-molecular combustion of rubber, plastic and the like at the same time of the flame-retardant, and the active magnesium oxide continuously absorbs the melted residue which is not fully combusted, The removal of smoke from the rapid stop of the combustion, prevents the droplet from dropping, is 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.
With the development of the polymer material industry, the fiber, the resin, the chemical industry, the building, the transportation, the rubber and other synthetic materials are more and more, but most of the polymers are materials that are easy to burn, and in many application fields, in order to prevent the fire, It is desirable to add a flame retardant to the polymeric material. Magnesium hydroxide is an important inorganic flame retardant, and has the advantages of good thermal stability, no volatilization, no precipitation, no toxic gas, no pollution and the like, and is a green and environment-friendly flame retardant which is widely used in plastics, rubber, flame-retardant and smoke and resin polymer materials.
Flame retardant is an additive that makes it difficult for polymers to catch fire and slow down combustion. According to the classification of elements contained in flame retardants, they can be divided into organic and inorganic flame retardants. Organic flame retardants can be divided into halogen flame retardants (including chlorine and bromine II) and nitrogen flame retardants. Inorganic flame retardants include antimony compounds, phosphorus and phosphate, boron compounds, magnesium hydroxide, zirconium compounds and bismuth compounds. With the development of science and technology and the improvement of people's awareness of environmental protection, the research and application of flame retardants in today's world is developing in the direction of non-halogenation.
the main varieties of the inorganic flame retardant are aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, tin oxide, iron oxide, acid peroxide, zinc borate, and the like, The decomposed oxide is also a high-temperature resistant substance, so that the two flame retardants can not only play a flame-retardant function, but also can play a filling role, and has the characteristics of no corrosive halogen gas and harmful gas, no volatilization, lasting effect, no toxicity, no smoke, no drop, and the like.