有机胺法制备氢氧化镁及其阻燃性能  

Preparation and Its Antiflaming Properties of Magnesium Hydroxide by Organic-Amine Method

作　　者：汪苏平 海吉忠 杨小波 张志君 吴江渝[1] 陈喆[1] 张勇[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430074 [2]青海盐湖工业股份有限公司青海盐湖资源综合利用重点实验室,青海格尔木816000

出　　处：《武汉工程大学学报》2016年第4期364-368,共5页Journal of Wuhan Institute of Technology

基　　金：青海盐湖资源综合利用重点实验室开放基金课题(Q-SYS-2014-KF-04)

摘　　要：以二正丁胺代替传统无机碱性前驱物作为沉淀剂的方法制备氢氧化镁.通过控制单一变量法,得到了最佳的实验条件,对氢氧化镁产品进行了形貌表征和粒径分析,并对氢氧化镁的阻燃机理进行了探索.研究表明,通过该方法制备氢氧化镁的最佳实验条件为:反应温度70℃左右,反应时间50 min左右,搅拌速率400 r/min;制得的氢氧化镁为片状结晶,尺寸在1.8μm左右,产品各项性能符合当前工业要求,且沉淀剂可回收二次利用,有望改善氢氧化镁的传统制备工艺.通过热重分析与模拟燃烧实验,推测氢氧化镁的阻燃机理为:一方面提高了材料的热分解温度,另一方面氢氧化镁分解产生的氧化镁同碳形成隔热隔氧层,共同达到阻燃效果.Magnesium hydroxide was prepared by using di-n-butylamine as a precipitating agent instead of thetraditional inorganic basic precursor.The reaction conditions were optimized by employing the single variablemethod.The morphology and particle size of the obtained magnesium hydroxide were characterized,and its anti-flaming mechanism was investigated.The results show that the optimal experimental conditions for the prepara-tion of magnesium hydroxide are as follows：reaction temperature of 70 ℃,reaction time of 50 minutes,and stir-ring rate of 400 r/min.The magnesium hydroxide has a form of lamellar crystal with an average diameter of 1.8μm,and its performances meet the industrial requirements.The precipitant can be recovered and recycled,thusthis method is expected to improve the traditional technology for magnesium hydroxide preparation.The resultsof thermal gravimetric analysis and simulated combustion test suggest that the antiflaming mechanism of magne-sium hydroxide can be ascribed to：it improves the thermal decomposition temperature of the used materials,and the magnesium oxide produced by the decomposition of magnesium hydroxide with the carbon forms a layerto achieve thermal insulation and oxygen exclusion

关 键 词：氢氧化镁 有机胺法 阻燃机理 粒径 形貌 

分 类 号：O611.6[理学—无机化学]