胶含量、pH值及电解质对Mg-Fe-HTlc/高岭土分散体系流变性的影响  

Effects of Composition, pH and Electrolyte on the Rheology of Mg-Fe-HTlc/Kaolin Suspensions

作　　者：戴肖南[1] 侯万国[1] 李俊娥[1] 张树芹[1] 

机构地区：[1]山东大学胶体与界面化学教育部重点实验室

出　　处：《应用化学》2005年第5期475-478,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20273041);教育部高等学校博士学科点专项科研基金(20040422047)资助项目

摘　　要：研究了Mg-Fe类水滑石化合物(HTlc)/高岭土分散体系及纯高岭土分散体系的流变性,考察了胶含量(R)、pH值、无机电解质(NaCl、MgCl2)和部分水解聚丙烯酰胺(PHPA)对分散体系结构恢复平衡时的剪切应力(τ)的影响。发现在所研究的胶含量范围内,Mg-Fe-HTlc/高岭土分散体系的剪切应力随R的升高先降低后升高,R=0.115时τ值最低。纯高岭土分散体系的剪切应力随pH值的增大先升高后降低,在pH为8左右出现最大值;而R=0.129的Mg-Fe-HTlc/高岭土分散体系的剪切应力则随pH值的增大而升高。无机电解质的加入使纯高岭土分散体系的剪切应力降低,而使R=0.129的Mg-Fe-HTlc/高岭土分散体系的剪切应力升高。PHPA使2种体系的剪切应力均降低,并对影响机理进行了初步探讨。The rheology of Mg-Fe-HTlc/kaolin suspensions and that of pure kaolin suspensions were studied. The effects of mass ratio of HTlc to kaolin(R), pH, electrolyte(NaCl, MgCl_(2)) and partially hydrolyzed (polyacrylamide)(PHPA) on the shear stress(τ) of the suspensions were studied. The results show that the τ value of Mg-Fe-HTlc/kaolin suspension decreased first and then increased with the increase of R. The increase in pH made the τ value of pure kaolin suspension increase first(pH<8) and then decrease(pH>8), but the τ value of Mg-Fe HTlc/kaolin suspension increased with the increase of pH all the time. The τ value of pure (kaolin) suspension decreased with addition of electrolytes. However, the τ value of HTlc/kaolin suspension with R=0.129 increased with the concentration of electrolytes. The τ values of the two suspensions were (reduced) by PHPA. The effect mechanism was discussed.

关 键 词：类水滑石化合物 高岭土 剪切应力 分散体系 流变性 

分 类 号：O648[理学—物理化学]