Abstract: In order to resolve the problem that Mg(OH)₂ is incompatible with the polymer, the two-step reaction of Mg(OH)2 preparation, synthesis reaction and hydrothermal modification, is one of the useful techniques. In this study, the synthesis reaction conditions of MgCl₂-NaOH route were investigated in a large-scale experimental set-up designed by authors, with focus on the influence of synthesis temperature and NaOH solution feeding rate on the morphology, particle sizes, crystalline structure and dispersion properties of the synthesis products and hydrothermal products. The regular hexagonal plates of Mg(OH)₂ with a larger particle size and a smaller specific area were formed after hydrothermal treatment.The dispersion properties of the hydrothermal products were improved owing to the alteration of growth direction for Mg(OH)₂ crystals, resulting in the increase of I₍₀₀₁₎/I₍₁₀₁₎. Under the experimental conditions, the increase of synthesis temperature and decrease of NaOH solution feeding rate were favorable to improving the morphology and dispersion properties of the synthesis products and hydrothermal products owing to the damage of the adsorption layer on the crystal surface.

摘要： 在自行研制的中试设备上用两步法（氢氧化钠合成法-水热反应法）制备出了氢氧化镁阻燃剂，分析了常温合成条件对制备氢氧化镁的影响.研究发现在相同的水热条件下，提高常温合成温度和降低氢氧化钠加料速率，有利于常温产物的水热改性处理，使之生成形貌规则、粒径分布均匀、分散性良好的氢氧化镁六方片状颗粒.