Magnesium hydroxide flame retardant is an inorganic flame retardant that is being actively developed at home abroad. In addition to the above advantages of aluminum hydroxide, its thermal stability smoke suppression performance are significantly better than aluminum hydroxide, hydroxide The dehydration reaction of magnesium occurs above 350℃, the heat absorption of magnesium hydroxide is 17% higher than that of aluminum hydroxide, which also helps to improve the flame retardant efficiency. At the same time, magnesium hydroxide is more suitable for polymers with high processing temperatures . This shows that different flame retardants have different characteristics uses.

The surface of ordinary magnesium hydroxide is hydrophilic, it is easy to disperse in the organic medium, the mixed viscosity of it the organic medium increases sharply as its content in the mixing system increases; while the higher fatty acid ( its salt) The surface modified magnesium hydroxide surface is oleophilic, it is easily dispersed in organic media, its mixed viscosity with organic media increases with its content in the mixing system, the upward trend is greatly slowed down.

Because the surface of magnesium hydroxide is weakly alkaline, the higher fatty acid radical ions react with the magnesium ions on the surface of the magnesium hydroxide powder to form a higher fatty acid magnesium adhere to the surface of the magnesium hydroxide powder. The polymer has affinity inhibits the agglomeration of active magnesium hydroxide, so magnesium hydroxide modified with higher fatty acids has better dispersion in rubber plastics. For example, the commonly used high-grade fatty acid salts of magnesium hydroxide are sodium stearate, suitable polymer materials are PP, PE; sodium oleate, suitable polymer materials are PP, PE, PVC; sodium dodecylbenzenesulfonate, Suitable polymeric materials are PP, PU, etc.