Why magnesium hydroxide flame retardant can become a widely used flame retardant

Magnesium hydroxide flame retardant is a kind of inorganic flame retardant for polymer matrix composites with good application prospects. Like aluminum hydroxide, magnesium hydroxide flame retardants rely on chemical decomposition to absorb heat and release water when heated to play a flame retardant role. Therefore, it has non-toxic, low smoke, and magnesium oxide formed after decomposition is chemically stable. Produce secondary pollution and other advantages. However, compared with halogen-containing organic flame retardants, in order to achieve a considerable flame retardant effect, the filling amount should generally reach more than 50%. Because magnesium hydroxide is an inorganic substance, the compatibility between the surface and the polymer base material is poor. Such a high filling amount, if it is not subjected to surface modification treatment, after filling into the polymer material, it will lead to composite materials The mechanical properties are reduced. Therefore, it must be surface-modified to improve its compatibility with the polymer base material, so that the mechanical properties of the filler material do not drop, and even the mechanical properties of the material are improved.

Decomposed magnesium oxide is also a good refractory material, which 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 triple functions of flame retardance, smoke suppression and filling in the rubber and plastic industry. Widely used in rubber, chemicals, building materials, plastics and electronics, unsaturated polyesters and paints, coatings and other polymer materials. In particular, it is used for the coating of wind deflectors for mines, PVC core conveyor belts, flame-retardant aluminum-plastic panels, flame-retardant tarpaulins, PVC wire and cable materials, mine cable sheaths, cable accessories, flame retardant, smoke suppression and antistatic It can replace aluminum hydroxide and has excellent flame retardant effect. Compared with similar inorganic flame retardants, magnesium hydroxide has better smoke suppression effect. Magnesium hydroxide has no harmful substances emitted during production, use and disposal, and can neutralize acidic and corrosive gases generated during combustion. When used alone, the dosage is generally 40% to 60%.

Why can magnesium hydroxide flame retardant be widely used?

At present, there is a large amount of aluminum hydroxide in China, but with the increase of the processing temperature of the polymer, aluminum hydroxide is easy to decompose and reduce the flame retardant effect. Magnesium hydroxide has the following advantages over aluminum hydroxide:

1. The thermal decomposition temperature of magnesium hydroxide reaches 340 ° C, which is 100 ° C higher than aluminum hydroxide, which is conducive to increasing the processing temperature of plastics, speeding up the extrusion speed, improving the plasticizing effect, shortening the molding time, and having a high surface gloss. Surface defects will be generated, and at the same time, it has a strong peel strength.

2. Uniform particle size distribution, good compatibility with the substrate, and little impact on the mechanical properties of the product.

3. Magnesium oxide formed after the combustion and dehydration of magnesium hydroxide is a high-strength, high-heat-resistant material, which can be used as a protective wall to isolate fire sources and toxic and harmful gases. Magnesium hydroxide has strong neutralizing ability with acids. Quickly neutralize the acid gases SO2, NOx, CO2, etc. generated during the plastic combustion process.

4. Magnesium hydroxide has high decomposition ability, high flame retardant efficiency, strong smoke suppression ability, low hardness, and low friction to the equipment, which helps to extend the life of the equipment.

5, the price is low, magnesium hydroxide is half the price of aluminum hydroxide, the filling amount is large, which can greatly reduce the cost of the product.