氨水沉淀-水热处理制备阻燃型氢氧化镁  

Preparation of flame retardant type Mg(OH)_2 by ammonia precipitation and hydrothermal treatment

作　　者：刘春英[1] 柳云骐[1] 安长华[1] 张晓云[1] 张文桥[1] 

机构地区：[1]中国石油大学(华东)化学化工学院,山东东营257061

出　　处：《无机盐工业》2008年第3期38-40,共3页Inorganic Chemicals Industry

摘　　要：以卤水、卤块和六水氯化镁为原料，采用两步法即氨水沉淀-水热处理过程制备出氢氧化镁阻燃剂。比较分析了水热处理、矿化剂、杂质硫酸根离子等因素对制备阻燃型氢氧化镁的作用及影响。实验结果表明：氨水沉淀得到的中间体经过水热处理，晶体的生长方向发生改变，（101）极性面得到抑制，而（001）面显露较多，特征衍射峰强I（001）/I（101）增大。杂质硫酸根对制备阻燃型氢氧化镁具有很大的影响，除去大部分硫酸根有利于制备结构稳定的氢氧化镁阻燃剂。两步法制备的阻燃型氢氧化镁产品为六方片状，较薄，分散性好，平均粒径200nm。产品纯度高（98．92％～99．06％），产品质量符合中国行业标准；而且两步法具有原料来源广、生产成本低、适宜工业化生产等特点。The flame retardant type magnesium hydroxide has been prepared with brine, halide, and magnesium chloride hexahydrate as raw materials by two - step process （ i. e. ammonia precipitation and hydrothermal treatment route ）. The effects of hydrothermal treatment, mineralizer and SO^2- anion etc. on preparing flame retardant type Mg （OH） 2 were compared and analysed. The results showed that compared with Mg（OH）2 products synthesized at normal temperature,the alteration of growth direction of Mg（OH）2 crystals after hydrothermal treatment results in the increase of I（001）/I（101） of the hydrothermal products which weakens the polarity of the Mg （ OH ） 2 crystals. The counter - ion SO^2- affects the structure of crystallites and the removal of impurity SO^2- is favorable for the formation of the flame retardant type Mg （ OH ） 2 with stable structure. The Mg（ OH}2 products with regular- hexagonal plate, thin, high dispersion property and mean particle size of 200 nm could be obtained by two - step process. The analysis of chemical composition showed that the magnesium hydroxide has a high purity （ 98.92% - 99.06% } with the quality coming up to the national standards. The two - step method has the advantages of accessible raw materials and low cost etc. And it could be easily used into industry production.

关 键 词：氢氧化镁 阻燃剂 两步法 水热处理 

分 类 号：TQ132.2[化学工程—无机化工]