| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnesium hydroxide-based flame retardant from which Mg<SP>2+</SP>ion is little eluted and which exhibits excellent moisture-resistant reliability and acid resistance, when compounded with a thermosetting resin. SOLUTION: This method for producing the magnesium hydroxide-based flame retardant is characterized by adding lithium hydroxide or sodium hydroxide to an aqueous suspension of magnesium hydroxide or magnesium oxide in an amount of≥100 mass % per 100 mass % of a solid content converted into the magnesium hydroxide, wet-crushing the mixture, subjecting the product to a hydrothermal treatment at 180 to 230°C, and then treating the surfaces of the obtained magnesium hydroxide particles with an Si compound and an Al compound to form a mixture coating layer of the Si compound with the Al compound in a total amount(converted into SiO<SB>2</SB>-Al<SB>2</SB>O<SB>3</SB>)of 0.2 to 10 mass % per 100 mass % of the magnesium hydroxide. When the flame retardant is compounded with an engineering plastic, the mixture is molded in high productivity in a state little foamed, because the flame retardant has high heat resistance. High tracking resistance is also obtained. COPYRIGHT: (C)2006,JPO&NCIPI
|
