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The yield of magnesium hydroxide was investigated via response surface methodology using bischofite and aqueous ammonia as raw materials. The experimental results indicated that the effects of reaction temperature, magnesium ion and aqueous ammonia concentrations on the yield of magnesium hydroxide gradually decreased. In particular, reaction temperature and magnesium ion concentration had a significant influence on the yield. After the regression and fitting of the response value and each factor, the regression equation was obtained. As proven by experiments, the predicted value and actual value showed a good fit. The products of the center experiment were characterized by particle size analysis, scanning electron microscopy, and X-ray diffraction. The results show that the morphology is irregular and shows a lamellar structure. The particles have a narrow size distribution ranging from 0.64 to 0.68 mm of D50 size. The difference in particle size of D10 and D90 is less than 0.91 mm, and the purity very high. 相似文献
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氢氧化镁阻燃剂填充EVA共聚物力学性能研究 总被引:2,自引:0,他引:2
研究了普通氢氧化镁、六角片状氢氧化镁和硬脂酸(SA)改性氢氧化镁分别填充到乙烯-乙酸乙烯共聚物(EVA)中制得的复合材料的力学性能。用红外光谱(FT-IR)、扫描电镜(SEM)对3种类型氢氧化镁及EVA/氢氧化镁复合材料的结构和形貌进行了分析。结果表明:相比普通氢氧化镁,六角片状氢氧化镁和SA改性的氢氧化镁有效地降低了表面极性,大大降低了对复合材料的力学性能的影响;4%(质量分数)SA改性氢氧化镁在EVA树脂中的分散性均匀,填料表面与树脂表面的界面黏结性较好;氢氧化镁(MH)粉体的加入增加了EVA/MH复合材料的拉伸强度,其中4%(质量分数)SA改性氢氧化镁粉体对复合材料拉伸强度的影响最大,六角片状氢氧化镁影响最小;氢氧化镁粉体填充量达到60质量份(60质量份氢氧化镁填充至100质量份EVA中)时,断裂伸长率降低到100%以下,复合材料力学性能急剧恶化。 相似文献
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在PVC生产过程中,VCM回收装置是一个很重要的组成部分。它是把聚合过程中未反应的VCM气体回收冷凝后输送到聚合工序继续反应。河北盛华化工有限公司(以下简称河北盛华)经过多年的扩建,PVC树脂生产能力已达到10万t/a,2004年开始运行VCM回收系统,至今已3年多,目前每天回收VCM45 t左右。1回收VCM工艺流程从聚合来的未反应VCM气体经过水环压缩机压缩后,再经过2台串联的冷凝器冷凝,冷凝器用0℃盐水做冷却介质,冷凝下来的VCM储存到储罐,然后间断地送回聚合工序。未冷凝的气体回到VCM尾气回收系统。工艺指标:压缩机进口压力0~0.3 MPa,… 相似文献
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