| In this dissertation, magnesium hydroxide flame retardant was prepared by "one-step" technology using magnesium chloride and magnesium sulfate as raw materials respectively. And the change on the performance of PP was investigated after filled with various amounts of Mg(OH)2 flame retardant and common Mg(OH)2. The major contents of this dissertation can be summarized as follows:1. When use magnesium chloride as raw materials, and the ammonia as the precipitating agent, and under the condition that the concentration of magnesium chloride solution was fixed at 1.0mol/L, volume at 200mL, the experimental result showed that the preferable reaction conditions were as following: the additive amount of the surface active agent A was 0.6 mL, the reaction temperature was 40℃, reaction time was 2h, aging time was 2h, and the amount of ammonia water was 30mL.2. When use magnesium sulfate as raw materials, and sodium hydroxide as the precipitating agent, and under the condition that the concentration of magnesium chloride solution was fixed at 1.0mol/L, volume at 200mL, the experimental result showed that the preferable reaction conditions were as following: the additive amount of the surface active agent B was 0.1g, the reaction temperature was 60℃, the reaction time was 1h, aging time was 3h, the concentration of sodium hydroxide solution was 3mol/ L.3. The experiments of adding magnesium hydroxide to polypropylene indicated that: when the additive quantities of magnesium hydroxide were 40phr, the oxygen index rised from 20 to 26, and the influence on the mechanical properties could be neglected. So, we could ensure that the appreciate additive quantities of magnesium hydroxide flame retardant was 40phr. |
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