Magnesium hydroxide is a new type of filled Flame Retardant. It releases bound water when it is thermally decomposed and absorbs a large amount of latent heat to reduce the surface temperature of the synthetic material it is filled in the flame.
The generated combustible gas cools. Magnesium oxide produced by decomposition is a good refractory material and can also help improve the fire resistance of synthetic materials. At the same time, the water vapor it emits can also be used as a smoke suppressant.
Magnesium hydroxide is recognized as an excellent flame retardant with three functions of flame retardancy, smoke suppression and filling in the rubber and plastic industry. It is widely used in polymer materials such as rubber, chemicals, building materials, plastics and electronics, unsaturated polyester, paints, and coatings.
Especially for mine air duct coated cloth, PVC whole core conveyor belt, flame-retardant aluminum-plastic board, flame-retardant tarpaulin, PVC wire and cable material, mining cable sheath, cable accessories, flame retardant, smoke suppression and antistatic , Can replace aluminum hydroxide, has excellent flame retardant effect. Compared with similar inorganic flame retardants, magnesium hydroxide has better smoke suppression effect. Magnesium hydroxide has no harmful emissions during production, use and disposal, and it can also neutralize the acid and corrosive gases generated during the combustion process. When used alone, the dosage is generally 40% to 60%. Magnesium hydroxide is an inorganic flame-retardant filler for polymer-based composite materials with good application prospects.
Like aluminum hydroxide, magnesium hydroxide flame retardant relies on chemical decomposition and absorption of heat and release of water when heated to achieve a flame retardant effect. Therefore, it has non-toxic, low smoke and stable chemical properties of magnesium oxide generated after decomposition. The advantages of secondary pollution. However, compared with halogen-containing organic flame retardants, in order to achieve a comparable flame retardant effect, the filling amount should generally reach more than 50%. Since magnesium hydroxide is an inorganic substance, the compatibility of the surface with the polymer base material is poor. Such a high filling amount, if it is not surface-modified, after being filled into the polymer material, it will result in a composite material The mechanical properties decrease.
Therefore, it must be surface modified to improve its compatibility with the polymer base material, so that the mechanical properties of the filling material will not decrease, and even some of the mechanical properties of the material will be improved. When magnesium hydroxide is heated (340-490 degrees), it decomposes and absorbs the heat on the surface of the combustible to be flame retardant; at the same time, it releases a large amount of water to dilute the oxygen on the surface of the combustible.
The combustion proceeded. Magnesium hydroxide not only produces no harmful substances during the entire flame-retardant process, but its decomposition products can also absorb a large amount of harmful gases and smoke generated by the combustion of rubber, plastics and other polymers while flame-retardant. Active magnesium oxide continues to absorb The incompletely burned molten residue can quickly stop the combustion while eliminating smoke and preventing droplets. It is an emerging environmentally friendly Inorganic Flame Retardant. According to chemical composition, flame retardants can be divided into two categories: organic flame retardants and inorganic flame retardants. Organic flame retardants are divided into two series: phosphorus series and halogen series. Organic flame retardants are gradually being replaced by inorganic flame retardants due to the disadvantages of high toxicity of decomposition products and large smoke.
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 absorb large amounts of heat due to decomposition. , And produce H2O to isolate the air, and the oxides after decomposition are high-temperature resistant substances. Therefore, the two flame retardants can not only play a flame retardant effect, but also play a filling role. It has no corrosiveness Halogen gas and harmful gas, non-volatile, long-lasting effect, non-toxic, smokeless, non-drip and other characteristics.
There may be some accidents in the application stage of magnesium hydroxide flame retardant, so it is necessary to make sufficient preparations before use, not only can improve the flame retardant effect of the flame retardant, but also make the whole process safer. The matters needing attention are as follows: Sample test before flame retardant. It is necessary to take some samples for flame retardant testing. The purpose of this is to test whether the flame retardant can meet the specified flame retardant standards and also to test whether the flame retardant is suitable for the flame retardant material, so as to avoid wasting the flame retardant.
The surface of the substrate should be properly cleaned before flame retardant. It is best not to have oil, water, dust, etc. on the surface. Before flame-retardant, understand the use method, temperature and time of flame-retardant, so as not to waste flame-retardant and materials. In order to prevent the flame retardant from being wasted and safety issues, it is necessary to pay enough attention to these before and after the use of magnesium hydroxide flame retardant.
Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
