氢氧化镁晶须制备表征及改性研究  

Preparation, characterization,and modification of magnesium hydroxide whiskers

作　　者：胡哓瑜[1] 韩充[1] 朱晓龙[1] 董殿权[1] 王米兰[1] 

机构地区：[1]青岛科技大学化工学院,山东青岛266042

出　　处：《无机盐工业》2013年第9期15-17,34,共4页Inorganic Chemicals Industry

基　　金：国家自然科学基金(51272114);山东省自然科学基金(2008BS09004);青岛市科技局[12-1-4-3-(8)-jch]资助项目

摘　　要：以碱式硫酸镁晶须(MHSH)和氢氧化钠为原料通过水热合成法制备出氢氧化镁晶须。实验确定了制备氢氧化镁晶须的适宜条件:n(碱式硫酸镁晶须)∶n(氢氧化钠)=1∶2,反应温度为200℃,反应时间为3 h,碱式硫酸镁晶须料浆质量分数为4%,氢氧化钠浓度为0.3 mol/L。对氢氧化镁晶须进行扫描电镜、X射线衍射及热分析得出,制备的氢氧化镁晶须为扇状,直径为1～2μm,长度为100～200μm,长径比为100～200。利用硅烷KH-550、硬脂酸、十二烷基苯磺酸钠、硬脂酸钠、油酸钾等表面改性剂对氢氧化镁晶须进行表面改性。结果表明:用油酸钾作表面改性剂,在氢氧化镁晶须料浆质量分数为5%、改性时间为30 min、改性温度为90℃、油酸钾用量为5%(质量分数)条件下可获得较好的改性效果,改性后晶须的活化指数达到99.48%。Magnesium hydroxide whiskers were prepared via hydrothermal synthesis method using basic magnesium sulfate whiskers（MHSH） and sodium hydroxide as reactants.The optimal experimental conditions have been confirmed by experiment： the amount-of-substance ratio of MHSH to NaOH was 1：2,the reaction temperature was 200℃ ,the reaction time was 3 h, mass fraction of MHSH pulp was 4%, and the concentration of sodium hydroxide was 0.3 mol/L.SEM,XRD,and TG-DTG were performed for analysis of magnesium hydroxide whiskers.The prepared whiskers with diameter of 1 -2 μm,length of 100-200 μm, and aspect ratio of 100-200 were fan-like.Magnesium hydroxide whiskers were modified by surface modification agents, such as KH-550, stearic acid, sodium dodecyl benzene sulfonate, sodium stearate, potassium oleate and so on.Results indicated that when using the potassium oleate as surface modification agent, controlling the mass fraction of magnesium hydroxide whiskers pulp at 5%, modification time at 30 min, modification temperature at 90℃, and potassium oleate dosage of 5 % （mass fraction ） , a good surface modification effect can be achieved, and the activation index of the modified magnesium hydroxide whiskers reached 99.48%.

关 键 词：氢氧化镁 晶须 水热合成法 表面改性 

分 类 号：TQ132.2[化学工程—无机化工]