摘要
研究了带永久正电荷的Mg-Al-Fe类水滑石(Mg-Al-Fe-HTlc)和带永久负电荷的钠质蒙脱土(MT)组成的悬浮体的流变性.考察了Mg-Al-Fe-HTlc/MT质量比(R)对表观粘度(ηA)、Bingham屈服值(τB)和E-B系数(K值)3个流变参数的影响.实验结果表明.MT含量≥3‰的纯MT体系和Mg-Al-Fe-HTlc/MT体系为塑性流体.纯MT体系符合Bingham流变方程;Mg-Al-Fe-HTlc/MT体系在低剪切速率(D.0～300s-1)区不符合Bingham流变方程;纯MT体系和Mg-Al-Fe-HTlc/MT体系在研究的范围内均符合Brinkman粘度方程.ηA、τB和K值随R的增大均呈现为先增大后减小的变化.在R=0.15附近出现最大值.对颗粒间的相互作用机理和表征参数进行了探讨,认为Brinkman粘度方程的E-B系数K值是能表征体系粒子间内在相互作用的“本征流变参数”.
In this paper, the rheological property of the suspension consisting of Magnesium-Aluminum- Iron Hydrotalcite-like compounds (Mg-Al - Fe-HTlc) possessing permanenl positive charges and Na-Montmorillonite (Na-MT) possessing permanent negative charges was studied. The applicability on the rheological equation of Bingham and viscosity equation of Brinkman were discussed. The influences of Mg-Al - Fe-HTlc/MT mass ratio (R) on apparent viscosity (ηA) ,Bing-ham yield stress (τB) and E - B coefficient (K) were also investigated. The results show that the pure MT suspension with content of MT≥3% and the Mg-Al -Fe- HTlc/MT suspension with content of MT≥3% belong to plastic fluid. The pure MT suspension conform to the rheological equation of Bingham, where as the Mg-Al-Fe-HTlc/MT suspension don't conform to the rheological equation of Bingham at lower shear rale (D,0-300s-1). Both the pure MT suspension and Mg- Al -Fe -HTlc/MT suspension conform to the viscosity equation of Brinkman in the studied range of shear rate. With the increase of R,ηA >σBτ and K all appear the trend that increase earlier and decrease later, and the maximum value was appeared in the range of R = 0. 15. The interactive mechanism of particles and the significatory parameter were discussed. We think the E-B coefficient K of the viscosity equation of Brinkman is the 'Intrinsic Rheological Parameter' that can indicate the internal interaction a-mong the particles of the system.
出处
《德州学院学报》
2004年第4期47-50,共4页
Journal of Dezhou University
基金
国家自然科学基金资助项目(29873026)
关键词
类水滑石
蒙脱土
流变性
悬浮体
Hydrotalcite - like Compounds
Montmorillonite
Rheological Property
Suspension
