摘要
纤维状氢氧化镁应用于高分子复合材料具有较好的阻燃及补强增韧作用,是具有较好发展前景的无卤阻燃剂,其研究和应用受到密切关注。本文在乙醇溶液中,以纤维状碱式氯化镁(Mg2(OH)3Cl·4H2O)和氢氧化钠为原料研究制备了纤维状氢氧化镁。实验考察了物料摩尔比、乙醇浓度、反应温度和碱式氯化镁浆料浓度等因素对转化时间及氢氧化镁形貌的影响规律,并以SEM和XRD对产品形貌和结构进行了表征分析。实验结果表明,氢氧化钠与碱式氯化镁摩尔比为2.5∶1,当溶剂为75%乙醇,反应温度为30℃,碱式氯化镁浓度为0.25 mol/L时,反应只需5 h左右,即可得到表面光滑,粒径约为30-50μm,直径约0.3μm,长径比达到100-120的纤维状氢氧化镁,转化率可达100%。该工艺对氢氧化钠需求量少,可在较短时间内得到长径比较大的纤维状氢氧化镁,更适合于工业化生产。
In view of the excellent flame retardant and toughening effect of fibrous magnesium hydroxide,a lot of investigations are carried out in this field.In this experiment, fibrous magnesium hydroxide was produced by selecting basic magnesium chloride and sodium hydroxide as initial materials in ethanol.The influence of material mole ratio,ethanol concentration,reaction temperature and concentration of basic magnesium chloride were thoroughly studied,and the morphology and structure of the product were characterized by SEM and XRD.The results showed that in the presence of 75% ethanol solvent, magnesium hydroxide fiber can be obtained in 5 h, when mole ratio of sodium hydroxide and basic magnesium chloride is 2.5 ∶1,concentration of basic magnesium chloride is 0.25 mol/L, and temperature at 30 ℃.This process is more suitable for industrialized production.Large aspect ratio fibrous magnesium hydroxide can be obtained in less demand of sodium hydroxide and in short time.
出处
《石河子大学学报（自然科学版）》
CAS
2015年第1期11-16,共6页
Journal of Shihezi University(Natural Science)
基金
兵团"科技人员服务南疆专项"(2012BA061)
石河子大学重大科技攻关项目(GXJS2011-ZDGG05-02)
关键词
纤维状氢氧化镁
碱式氯化镁
乙醇
fibrous magnesium hydroxide
basic magnesium chloride
ethanol
