Flame retardants are divided into two categories: halogen flame retardants and halogen-free flame retardants. Since traditional halogen flame retardants have a great threat to the environment and humans, halogen-free flame retardants will be the future development trend .

Halogen-free flame retardants can be divided into inorganic and organic flame retardants. According to the classification of flame retardant elements, it can be divided into magnesium-aluminum series, phosphorus series, nitrogen series, phosphorus-nitrogen series, silicon series, antimony series, etc. At present, halogen-free flame retardants used in large amounts in industry are mainly zinc borate, aluminum hydroxide, magnesium hydroxide, red phosphorus and antimony trioxide.

Magnesium hydroxide flame retardant is a flame retardant that integrates three functions of flame retardant, smoke suppression and filling. It will not produce secondary pollution, accounting for more than 80% of inorganic flame retardants. Great attention. Magnesium hydroxide is non-toxic, non-corrosive, has good stability, does not produce toxic gases at high temperatures, and has a wide range of sources. It is considered to be the most promising. Compared with aluminum hydroxide (ATH), it has higher thermal stability (decomposition temperature is about 3 400℃, about 100℃higher than ATH), can be used in many engineering plastics; heat absorption is about 17% higher than AT H ; Smoke suppression ability is better than ATH; Hardness is lower than ATH, which is conducive to prolong the service life of flame retardant polymers.

The flame retardant mechanism of the magnesium hydroxide flame retardant is the cold trap effect: when heated, the temperature reaches 300°C to decompose and absorb heat, which can reduce the flame temperature; the decomposition process releases water vapor, and the concentration of combustible gas and foreign gas is diluted to inhibit the continuation of combustion; The metal oxide layer generated by the dehydration process has a very high specific surface area, which can cover the surface of the material to play a role of isolation, and at the same time can absorb smoke and flammable hair, thereby preventing combustion.

The thermal decomposition temperature of magnesium hydroxide is 140℃higher than that of aluminum hydroxide, which can make the synthetic material added with magnesium hydroxide withstand higher processing temperature, and also help to improve the flame retardant efficiency. The fine particle diameter of magnesium hydroxide is relatively small for equipment wear, which is beneficial to prolong the service life of processing equipment.

Hefei zhongke flame retardant New materials Co.,Ltd is professional flame retardant manufacturer, produce halogen free flame retardants for 17 years, specialized in magnesium hydroxide and aluminium hydroxide, with strong production ability, professional technical, competitive price.