Preparation method of a polyhedral oligomeric silsesquioxane-magnesium hydroxide composite flame-resistant material

The invention provides a preparation method of a polyhedral oligomeric silsesquioxane-magnesium hydroxide composite flame-resistant material. The preparation method comprises the following steps: step A: adding methyltrichlorosilane and acetone to a constant-temperature magnetic stirring water batch tank, heating and stirring to obtain a uniformly mixed solution, and dropwise adding distilled water into the mixed solution; step B: heating and keeping backflowing; step C: under a continuous magnetic stirring condition, dropwise adding a magnesium chloride aqueous solution to a precipitator, and meanwhile, controlling a pH value of the solution to 8-10 to obtain magnesium hydroxide sol; step D: when the backflowing reaction in the step B performs for two third of the total reaction time, slowly dropwise adding the magnesium hydroxide sol obtained in the step C to the backflow reaction solution, further carrying out the backflowing reaction for the residual one third of the total reaction time; step E: filtering the obtained mixed solution, and performing vacuum drying to obtain a composite flame-resistant material. According to the preparation of the polyhedral oligomeric silsesquioxane-magnesium hydroxide composite flame-resistant material, the synergistic effect of the polyhedral oligomeric silsesquioxane and magnesium hydroxide is put into a full play, and the flame resistance is greatly improved.