剪切速率对Fe-Al-Mg-MMH/钠质蒙脱土悬浮体触变性的影响

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。

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

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 suspensions is discussed.