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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (8): 693-696. 上一篇    下一篇

研究论文

Mg-Fe-HTlc/高岭土悬浮体流变性研究

戴肖南1 2，侯万国*1，李丽芳3，焦燕妮1   

  1. (1山东大学胶体与界面化学教育部重点实验室 济南 250100)
    (2德州学院化学系 德州 253023)
    (3山东农业大学化学与材料科学学院 泰安 271018)
  • 投稿日期:2004-07-08 修回日期:2004-12-28 发布日期:2010-12-10
  • 通讯作者: 侯万国

Study on the Rheology of Mg-Fe-hydrotalcite-like Compound/Kaolinite Suspensions

DAI Xiao-Nan1,2, HOU Wan-Guo*1, LI Li-Fang3, JIAO Yan-Ni1   

  1. (1 Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100)
    (2 Department of Chemistry, Dezhou College, Dezhou 253023)
    (3 College of Chemistry and Material Science, Shandong Agriculture University, Tai'an 271018)
  • Received:2004-07-08 Revised:2004-12-28 Published:2010-12-10
  • Contact: HOU Wan-Guo

PDF

1101

被引次数

33

研究了Mg-Fe类水滑石(HTlc)/高岭土(kaolinite)悬浮体的质量比(R)对其流变性和触变性的影响, 发现控制剪切速率(D)得到的屈服应力(τy)和控制剪切应力(τ)得到的临界剪切应力(τc)皆随R的增大先降低后升高. 小幅振荡剪切实验发现随R的增大, 体系由正触变性转化为复合触变性, 其中用小幅振荡剪切法在线性粘弹区发现复合触变性体系还是首次. 恒剪切速率(DL)实验发现了震荡现象, 即粘度随时间发生周期性升高和降低的变化. 震荡现象与DL和R有关, 较高的DL和R可使震荡现象消失. 测定粘度随时间变化时采用的低剪切速率(DL)影响体系的触变性类型. 根据HTlc和kaolinite粒子间的相互作用对实验结果的机理进行了探讨.

关键词: 类水滑石化合物, 流变性, 触变性, 分散体系, 高岭土

The rheological properties of Mg-Fe-hydrotalcite-like compound/kaolinite suspensions, such as yield stress and thixotropy, have been investigated, mainly on the effect of mass ratio of Mg-Fe-HTlc to kaolinite suspensions (R). Both of the yield stress τy obtained in the Controlled Rate mode and critical shear stress τc obtained in the Controlled Stress mode decreased first then increased with increase of R. In the linear oscillatory experiments, the type of thixotropy of HTlc/kaolinite suspensions was transformed from positive thixotropy to complex thixotropy with increase of R. It was the first time to find the complex thixotropy in linear viscoelastic region by oscillatory shear measurements. In the steady shear experiments, the recovery processes have been monitored at low shear rate, finding a very interesting phenomenon, i.e., the fluctuation behavior of apparent viscosity η with t, and its disappearance when DL and R were relatively high. The results were discussed on the basis of the interactions between the HTlc and kaolinite particles.

Key words: hydrotalcite-like compound, rheology, thixotropy, suspension, kaolinite