羧甲基纤维素钠/蒙脱土悬浮体系的流变性能及其影响因素  

Rheologic Property and Influencing Factors of Sodium Carboxymethyl Cellulose/Montmorillonite Suspension

作　　者：连英惠[1] 李丽芳[2] 赵凡[2] 赵文洁[2] 

机构地区：[1]山东农业大学植物保护学院,泰安271018 [2]山东农业大学化学与材料科学学院,泰安271018

出　　处：《应用化学》2013年第10期1208-1214,共7页Chinese Journal of Applied Chemistry

摘　　要：考察了蒙脱土(MT)质量分数(w)、羧甲基纤维素钠(CMC)/MT质量比(R)、电解质(NaCl、MgCl2和AlCl3)、pH值和温度对MT或CMC/MT悬浮体系流变性能和触变性的影响。结果表明,随w增加,纯MT悬浮体系的流体类型由近牛顿流体向塑型流体变化,触变类型则由无触变、正触变向复合触变性转变;而CMC/MT悬浮体系仍保持MT体系的正触变塑型流体特征,但屈服值τ0和稠度指数K增加,滞后环面积S和电动电势|ζ|先增加后减小,表现出同步变化。电解质和实验温度均不改变CMC/MT悬浮体系的正触变性塑型流体特征,但电解质使τ0和K增加,而温度增加使τ0和K减小。随介质pH值的增加,CMC/MT体系由负触变性变为正触变性,|ζ|增大,S先增加后减小,且在pH=8.46时达到最大。In order to unveil the rheological properties of suspensions of montmorillonite（MT） and its mixture with sodium carboxymethyl cellulose （ CMC ）/MT, the effects of the mass fraction w of MT, mass ratio R of CMC to MT, electrolyte, pH and experimental temperature on such properties have been systematically studied. When w（MT） was increased from 1.0% to 3.0% , pure MT suspension changed from Newtonian- like fluid to plastic one, and the thixotropic type changed from non-thixotropy to positive thixotropy and then a complex one. For CMC/MT plastic suspension, the increase of R （fixing w （MT） = 2. 0% in all the systems） would cause the yield value（τ0 ） and consistency coefficient（K） to increase as well. The hysteresis loop area （S） increased initially and then decreased, which was accompanied with a synchronous variation of the absolute zeta potential value （｜ζ｜）. The plastic and thixotropic characters of CMC/MT suspension could not be altered by either the electrolytes or experimental temperature investigated. But the yield value τ0 and consistency coefficient K would increase with the increase of electrolyte （NaC1, MgCI2 and AlCl3 ） concentrations or the decrease of experimental temperature. With the increase of pH value of CMC/MT suspension, its thixotropic type was transformed from negative into positive and the ｜ζ｜ incresesd, meanwhile the S firstly increased and then decreased and its maximum value was reached at pH = 8.46.

关 键 词：蒙脱土 羧甲基纤维素钠 流变性 触变性 滞后环 

分 类 号：O648[理学—物理化学]