Magnesium hydroxide as a flame retardant material has many advantages.
(1)The decomposition temperature of magnesium hydroxide is high, and the ignition point is higher than aluminum hydroxide, which improves the heating temperature of polymer material;
(2)The MgO generated after burning and dehydration is a refractory material, and is a basic oxide, which can absorb acidic gas;
(3) Strong heat absorption ability and high efficiency of flame retardant;
(4) low cost, easy to process in different polymer materials.
In recent years, magnesium hydroxide as a kind of green environmental protection flame retardant, the application volume is very large.
Preparation of magnesium hydroxide
Preparation of magnesium hydroxide most need to control the two aspects: (1) filtration performance, if the magnesium hydroxide slurry settling performance is poor, it will affect the washing and separation operation process, resulting in magnesium hydroxide synthesis cycle longer, and will affect the yield of magnesium hydroxide; (2) control the morphology, because the magnesium hydroxide with regular morphology of flame retardant effect is better, so you need to use the appropriate production methods and process conditions to achieve requirements.
The main production process of magnesium hydroxide are direct precipitation method, magnesium ore containing grinding method, magnesium oxide hydration method, etc.
Direct precipitation method
At present...
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