Spherical magnesium hydroxide particle, spherical magnesium oxide particle, and method for producing same

[0102] [Example 1]

[0103] In a solution containing 0.4% by mass of zinc oxide and 1 liter of ion-exchanged water with respect to the magnesium oxide used in the reaction, 0.5% by mass of aluminum chloride·hexahydrate and 0.03 mol of propionic acid relative to 100 g of magnesium oxide was used to prepare a reaction liquid.

[0104] The temperature of the prepared reaction liquid was raised to 60° C., and 100 g of magnesium oxide having an average particle diameter of 8.8 μm was introduced to obtain a mixed liquid. After adding magnesium oxide, the temperature of the reaction liquid was raised to 95° C., using a stirrer (T.K. HOMO DISPER manufactured by PRIMIX Corporation), the peripheral speed was adjusted to 9 m / s, and the reaction was performed for 1 hour.

[0105] After that, stirring was carried out at 90°C for 4 hours at a rotation speed sufficient to stir the slurry to prepare a magnesium hydroxide slurry. The prepared magnesium hydroxide slurry is filtered, washed with water

[0106] [Example 2]

[0107] Except the addition amount of zinc oxide being 3.0 mass %, it carried out similarly to Example 1.

[0108] [Example 3]

[0109] Except that the addition amount of zinc oxide was 0.1% by mass, the same procedure as in Example 1 was carried out.