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机构地区:[1]沈阳化工大学材料科学与工程学院,辽宁沈阳110142
出 处:《沈阳化工大学学报》2016年第1期11-17,共7页Journal of Shenyang University of Chemical Technology
基 金:国家科技支撑计划项目(2012BAB06B03);国家自然科学基金项目(51073095)
摘 要:以低品位菱镁矿制备的轻烧粉(主要成分为MgO)和硫酸作为原料,采用水热合成法制备碱式硫酸镁晶须.通过x射线衍射(XRD)仪、热重(TGA)分析仪、扫描电镜(SEM)对产物的微观形貌及组成进行表征、测试,结果表明:控制水化过程料浆中MgSO4与Mg(OH):摩尔浓度比为1:2,搅拌速率为600r/min,160℃下反应4h,所得晶须形貌均匀完整,长径比为30~80,化学组成为MgSO2·5Mg(OH)2·2H2O.将所得晶须经硬脂酸钠改性后填充到PP树脂中,探究晶须含量对复合材料的力学性能和阻燃性能的影响,实验结果表明:当添加量为10%(质量分数)时,复合材料的力学性能较佳;氧指数测试结果表明:碱式硫酸镁晶须对PP具有抑制熔滴产生、提高成炭量的作用.The magnesium sulfate whiskers were prepared with MgO and H2 SO4 by using the method of hydrothermal synthesis. X-ray diffraction ( XRD ), thermo gravimetric analyzer ( TG ), and scanning elec- tron microscope (SEM) were employed to characterize the microstructure and molecular formula. The magnesium sulfate whisker prepared at 160 ~C ,600 r/min and c( MgSO4 ) : c( Mg(OH) : ) = 1 : 2 for 4 h exhibited smooth and fibrous whisker with aspect ratios between 30 and 80. It also researched the modifi- cation to whisker by sodium stearate and the mechanical and flame retardant property of composite, which was prepared by the modified whisker filled polypropylene resin. At the whisker content of 10 %, the ten- sile strength of the composite was better. The result of oxygen index showed that the magnesium sulfate whiskers could restrain the molten and increase the charting.
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