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化学学报
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化学学报 ›› 2002, Vol. 60 ›› Issue (4): 749-752. 上一篇    下一篇

研究论文

剪切速率对Fe-Al-Mg-MMH/钠质蒙脱土悬浮体触变性的影响

李淑萍;侯万国;戴肖南;胡季帆   

  1. 山东大学,济南(250100);德州学院化学系,德州(253023);山东大学物理系, 济南(250100)
  • 发布日期:2002-04-15

The Influence of Shear Rate on the Thixotropy of Ferric Aluminum Magnesium Hydroxide/Na-Montmorillonite Suspension

Li Shuping;Hou Wanguo;Dai Xiaonan;Hu Jifan$DLi Dongqing   

  1. Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University,Jinan(250100);Chemistry Department, Dezhou University,Dezhou(253023);Physical Department, Shandong University,Jinan(250100)$DDepartment of Mechanical and Industrial Engineer, University of Toronto.Canada,Toronto Ontario
  • Published:2002-04-15

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568

被引次数

42 | 7

研究了测定条件对Fe-Al-Mg型混合金属氢氧化物（简称MMH）/钠质蒙脱土（简 称MT）混合悬浮体及纯MT体系触变性的影响，主要考察了高速剪切分散后，剪切速 率（D_L）对粘度（η）～时间（t）变化趋势的影响。发现纯的MT体系和MMH/MT质 量比（R）为0.013的Fe-Al-Mg-MMH/MT体系在所研究的D_L下（10，170，511和1 022 s~(-1)）都呈现为正触变性，D_L不影响触变性类型。R = 0.051的体系，低 D_L时（10和170 s~(-1)）呈现复合触变性，高D_L时（511和1 022 s~(-1)）呈现 正触变性；R = 0.091的体系在低D_L时（10和170 s~(-1)）呈现负触变性，在高 D_L时（511和1 022 s~(-1)）呈现复合触变性。D_L增加，各体系η逐渐降低。对 D_L影响触变性的机理进行了深入探讨。

关键词: 氢氧化物, 蒙脱石, 触变性, 剪切速度, 粘度

In this paper, the influence of measuring conditions, the shear rate (D_L) used to measure the viscosity of the suspension, on the thixotropy of Fe-Al-Mg-mixed metal hydroxide (MMH)/Na-montmorillonite (MT) system and the pure MT suspensions was studied. It was found that the pure MT suspension and the Fe-Al-Mg-MMH/MT suspensions with MMH/MT mass ratio (R) = 0.013 displayed positive thixotropy in the studied range of D_L (10, 170, 511 and 1 022 s~(-1)), i.e. the shear rate did not influence their thixotropic type. The Fe-Al-Mg-MMH/MT suspension with R = 0.051 displayed complex thixotropy at lower D_L (10 and 170 s~(-1)) and positive thixotropy at higher D_L (511 and 1 022 s~(-1)), respectively. The Fe-Al-Mg-MMH/MT suspension with R = 0.091 displayed negative thixotropy at lower D_L (10 and 170 s~(-1)), and complex thixotropy at higher D_L (511 and 1 022 s~(-1)), respectively. The viscosity of the suspensions studied decreased gradually with the increase of D_L. Furthermore, the mechanism by which D_L influences the thixotropy of the suspension is discussed.

Key words: HYDROXIDE, MONTMORILLONITE, THIXOTROPY, SHEAR RATE, VISCOSITY

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