Modified magnesium hydroxide flame retardant as well as preparation method and application thereof

The invention provides a modified magnesium hydroxide flame retardant as well as a preparation method and application thereof, and relates to the technical field of flame-retardant materials. The modified magnesium hydroxide flame retardant provided by the invention comprises magnesium hydroxide and silicon dioxide coated on the surface of the magnesium hydroxide. Compared with magnesium hydroxide, the modified magnesium hydroxide flame retardant provided by the invention has the advantages of good flame retardant effect and high flame retardant efficiency, and can reduce the addition amount of the modified magnesium hydroxide flame retardant in a high polymer material in the process of preparing a high polymer flame retardant composite material, thereby ensuring better physical and mechanical properties of the high polymer material. According to the preparation method of the modified magnesium hydroxide flame retardant provided by the technical scheme, the surface of magnesium hydroxide can be uniformly coat