Magnesium hydroxide decomposes when heated (340-490 degrees) to absorb the heat on the surface of the combustor to the flame retardant; at the same time, it releases a large amount of water to dilute the oxygen on the surface of the combustor, and the active magnesium oxide formed by decomposition adheres to the surface of the combustible and further prevents the combustion from proceeding. magnesium hydroxide not only does not produce any harmful substances during the whole flame retardant process, but also its decomposed products can absorb the harmful gases and smoke produced by the combustion of polymer such as rubber and plastics in large quantities while flame retardant. active magnesium oxide continuously absorbs the melting residue of incomplete combustion, from removing smoke and preventing droplets while the combustion stops quickly. an emerging environmentally friendly inorganic flame retardant.
with the development of polymer materials industry, fiber, resin, chemical industry, construction, transportation, rubber and other synthetic materials are increasing. however, most polymers are easily combustible materials. in many applications, flame retardants need to be added to polymer materials to prevent fire. magnesium hydroxide is an important inorganic flame retardant. it has many advantages, such as good thermal stability, no volatilization, no precipitation, no toxic gas, no pollution and so on. it is a green and environmentally friendly flame retardant. it is widely used in plastics, rubber, flame retardant and tobacco and resin polymer materials.
Magnesium hydroxide flame retardant is a promising inorganic flame retardant filler for polymer matrix composites. Like aluminum hydroxide, magnesium hydroxide flame retardants act as flame retardants by chemical decomposition and heat absorption when heated, so they have the advantages of non-toxic, low smoke and stable chemical properties and no secondary pollution. However, compared with halogen-containing organic flame retardants, to achieve a considerable flame retardant effect, the filling amount should generally reach more than 50%. Because magnesium hydroxide is inorganic, the compatibility between the surface and polymer base material is poor, so high filling amount, if not surface modification treatment, filling. to polymer materials, which will lead to the decline of the mechanical properties of the composites. Therefore, it is necessary to carry out surface modification treatment to improve its compatibility with polymer-based materials, so that the mechanical properties of the filling materials do not decline, and even some of the mechanical properties of the materials are improved.
What are the characteristics of wood flame retardants:
High flame retardancy in 1： can prevent flame burning and smoldering (flame-free, red-hot);
2： the flame retardant itself is non-toxic and does not pollute the environment during production and use, the pyrolysis products of flame retardant wood should be less smoke, low toxicity, non-irritation and non-corrosive;
3： flame retardancy lasting, in the process of use does not occur heat, light decomposition, not easy to hydrolyze and loss;
4： low hygroscopicity and good dimensional stability of flame retardant wood;
5： physical and mechanical properties and technological properties of wood are largely unaffected;
6： has anti-corrosive, anti-worming performance;
7： the visual, tactile and regulatory environmental properties of wood are largely unaffected;
8： cost is low, source is rich, easy to use.