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首先以制盐母液和氨水为原料制备出氢氧化镁滤饼,再以硫酸镁和自制的氢氧化镁为原料,通过水热合成法制备出碱式硫酸镁晶须。实验确定了制备碱式硫酸镁晶须的适宜条件∶n(Mg(OH)2)∶n(MgSO4)=1:4,反应时间为4h,反应温度为190℃,硫酸镁溶液的浓度为0.3mol/L。对碱式硫酸镁晶须进行组成分析、SEM、XRD及TG-DTG分析,制备的晶须为扇状,直径为1～2μm,长度为200～300μm.长径比为150～250。合成的碱式硫酸镁晶须组成为MgSO4.5Mg(OH)2.2H2O。在聚丙烯中加入碱式硫酸镁晶须后,有明显的阻燃性能。
Firstly, magnesium hydroxide filter cake was prepared from salt making mother liquor and ammonia water, and magnesium sulfate sulfate and homemade magnesium hydroxide were used as raw materials to prepare basic magnesium sulfate whisker through hydrothermal synthesis. The optimum reaction conditions were as follows: n (Mg (OH) 2): n (MgSO4) = 1: 4, the reaction time was 4h, the reaction temperature was 190 ℃, the concentration of magnesium sulfate solution was 0.3 mol / L. The composition of magnesium sulfate whisker was analyzed by SEM, XRD and TG-DTG. The prepared whiskers were fan-shaped with diameter of 1 ~ 2μm and length of 200 ~ 300μm and length-diameter ratio of 150 ~ 250. Synthetic basic magnesium sulfate whisker composition MgSO4.5Mg (OH) 2.2H2O. Addition of basic magnesium sulfate whiskers in polypropylene has obvious flame retardancy.