Surface modified magnesium hydroxide as well as preparation method and application thereof

The invention relates to the technical field of processing of magnesium hydroxide flame retardants and discloses surface modified magnesium hydroxide as well as a preparation method and application thereof. The method comprises the following steps: firstly, carrying out first contact on a modifier I and magnesium hydroxide; secondly, carrying out second contact on a modifier II and a product obtained in the first step, wherein the modifier I is castor oil and the modifier II is phosphate or organic hypophosphorous acid metal salt. The method adopts the castor oil and phosphate compounds for double coating, and has the advantages of simple process, easiness in operation, high controllability and simple equipment; the method has no pollution in the whole process, and conforms to the requirements on energy conservation and environmental protection; in addition, the surface modified magnesium hydroxide prepared by the method has the advantages that the compatibility and thermal stability of the surface modified m