Preparation of magnesium hydroxide flame retardant via MgCl2-NH3·H2O synthesis and hydrothermal modification treatment methods
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摘要: 为了解决氢氧化镁和聚合物之间的不相容问题, 对氨合成法-水热改性处理2步法制备高分散氢氧化镁阻燃剂进行了研究,分析了常温合成温度、水热改性温度和水热改性时间对制备大晶型、低比表面积氢氧化镁阻燃剂的影响.结果表明,经过水热改性处理改变了氢氧化镁晶体的生长习性,生成了形貌规则、粒径分布均匀、分散性良好的氢氧化镁六方片状颗粒.另外通过提高氯化镁浓度和氨水过量1倍,探讨了常温合成反应的转化率,认为应该在反应原料等当量下寻求提高转化率的可行方法.Abstract: In order to solve the problem that the Mg(OH)2 is incompatible with the polymer, the two steps reaction of high dispersive Mg(OH)2 preparation, synthetic reaction and hydrothermal modification treatment, was studied. The effect of the synthetic reaction temperature, hydrothermal modification temperature and time was investigated for preparation of Mg(OH)2 flame retardant with large crystalline structure and small specific surface area. The experimental results indicate that the growth direction of Mg(OH)2 crystal is changed and the regular hexagonal plates of Mg(OH)2 with uniform particle size and high dispersion characteristic are formed after the hydrothermal modification treatment. With the increasing MgCl2 concentration and/or feeding excessive NH3·H2O, percent conversion rates of raw materials are discussed. The results show some new technologies should be studied for increasing percent conversion of raw materials when synthetic reaction is equivalent.
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