| 摘要 |
PROBLEM TO BE SOLVED: To impart a high degree of flame retardancy by compounding, in a resin, a piperazine skeleton-bearing amine-containing zinc phosphate. SOLUTION: The flame retardant consists of a piperazine skeleton-bearing amine-containing zinc phosphate of the general formula: [A][ZnaPbbOcHd] (wherein a is an integer of 1 to 2; b is an integer of 1 to 3; c is an integer of 4 to 12; d is an integer of 1 to 10; and A represents an amine having a piperazine skeleton). The piperazine skeleton-bearing amine A preferably includes, for example, piperazine, 2-methylpiperazine, N-methylpiperazine or the like. This flame retardant is prepared by mixing a zinc phosphate aqueous solution having a ratio by mole of phosphoric acid and zinc of 1.0 to 3.0 and an aqueous solution of a piperazine skeleton-bearing amine in an amount sufficient to provide a ratio by mole of the amine and zinc of 0.5 to 1.2, followed by adjusting the pH to 3 to 8 and aging. Subsequently, the mixture is subjected to solid-liquid separation, washing and drying. When the zinc phosphate aqueous solution and the aqueous solution of the piperazine skeleton-bearing amine are mixed, the temperature is preferably within a range of 0 to 50 deg.C.
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