【摘要】 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 (DL)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 .0 13的Fe Al Mg MMH/MT体系在所研究的DL 下 (10 ,170 ,5 11和 10 2 2s-1)都呈现为正触变性 ,DL 不影响触变性类型 .R =0 .0 5 1的体系 ,低DL 时 (10和 170s-1)呈现复合触变性 ,高DL 时 (5 11和10 2 2s-1)呈现正触变性 ;R =0 .0 91的体系在低DL 时 (10和 170s-1)呈现负触变性 ,在高DL 时 (5 11和 10 2 2s-1)呈现复合触变性 .DL 增加 ,各体系 η逐渐降低 .对DL 影响触变性的机理进行了深入探讨 .更多还原

【Abstract】 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.更多还原