【作者】 杨静； 杜高翔； 郑水林； 丁浩；

【Author】 YANG Jing~(1,3) DU Gao-xiang~2 ZHENG Shui-lin~3 DING Hao~2 (1.Division of S&T Communication National Natural Science Foundation of China,Beijing 100085,China;2.The China University of Geosciences (Beijing),Beijing 100083,China;3.The China University of Mining and Technology (Beijing),Beijing 100083,China)

【机构】 国家自然科学基金委员会； 中国地质大学(北京)材料科学与工程学院； 中国矿业大学(北京)化学与环境工程学院；

【摘要】 氢氧化镁粉的超细化和高分散性是充分发挥其在聚合物材料中的阻燃性的前提．对片状纳米氢氧化镁粉的制备工艺以及几种表面活性荆的种类、用量对纳米氢氧化镁粉的分散性的影响进行了研究,并通过扫描电子显微镜（SEM）、红外光谱（FTIR）对其进行了表征．研究结果表明,制备片状纳米氢氧化镁的最优工艺条件是：镁液中 Mg²⁺的初始浓度为22．75g/L,沉淀剂用20％的 NaOH 溶液,反应温度为50℃,反应时间为 5min．SEM 分析表明：在此条件下制得的片状纳米级氢氧化镁粉片径100nm 左右,厚10nm 左右,但是颗粒之间团聚严重,团聚颗粒达到微米级．使用硅烷 FR-693、钛酸酯 YB-502和聚乙二醇对氢氧化镁进行原位改性可以提高其分散性．硅烷 FR-693、钛酸酯 YB-502和聚乙二醇的最佳用量分别为氢氧化镁质量的1．5％,1．5％, 0．75％．FTIR 分析表明,3种改性剂都可以吸附在氢氧化镁颗粒表面并形成化学吸附．其中硅烷 FR-693与粉体表面形成 Si—O—Mg 化学键合,钛酸酯 YB-502与粉体表面形成 Ti—O—Mg 键合．更多还原

【Abstract】 Superfine and high dispersivity is the most important property of Mg（OH）₂ powder when it used as fire resistance in polymer materials.This article studies the preparation technics of plate-shape nanometer Mg（OH）₂ powder and the influences of kinds and consumptions of several surfactants on the dispersivity of the nano-meter Mg（OH）₂ powder,and also characterizes it by scanning electron microscope（SEM）,infrared spectrum （FT IR）.The research result shows that the optimal technics condition of the preparation of nano-meter Mg（OH）₂ powder is:the original concentration of Mg²⁺ is 22.75g/L,and the precipitator is 20%NaOH solution,the reaction temperature is 50℃,and the reaction time is 5min.Analysis of SEM indicates that the diameter and thickness of plate-shape Mg（OH）₂ powder is respectively some 100nm and 10nm,but the agglomeration is so serious that the apparent diameter of the Mg（OH）₂ powder can reach micron level.The surface modification of Mg（OH）₂ powder when it’s precipitated can improve its dispersivity by silicane FR-693, organotitanate YB-502 and polyglycol.The optimal dosage of FR-693,YB-502 and polyglycol are respectively 1.5%, 1.5%,and 0.75% of the mass of Mg（OH）₂.Analysis of FTIR demonstrates that all of the three modifiers can adsorb on the surface of Mg（OH）₂ particle,forming chemisorptions,among which silicane FR-693 forms Si—O—Mg chemically bond with the particle surface,while YB-502 generates Ti—O—Mg chemically bond.更多还原