羧甲基纖維素/膨潤土/雲母懸浮液之增稠效應及流變探討

The Study of Rheological Behavior and Thickening Effect of Carboxymethyl Cellulose/Bentonite/Mica Suspension

劉國瑞(Kuo-Jui Liu)

指導教授 ： 芮祥鵬

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2007年)

摘要

無資料

關鍵字

流變行為 ； 線切割機泥漿 ； 剪切變稀 ； 搖變性 ； 非牛頓流體

並列摘要

CMC (Sodium Carboxymethyl Cellulose) molecules are most extended at low concentrations but at higher concentrations the molecules overlap and coil up and then, at higher concentrations, entangle to become a gel. With low degree of substitution CMC suspension exhibit non-Newtonian behavior. Over 4% concentration CMC suspension exhibit shear thinning behavior and thixotropy .
Bentonite (PAI KONG NANO TECHNOLOGY CO., LTD.) is utilized in the study, we found dispersedness is improved after treating with cationic surfactant-coco dimethyl benzyl ammonium salt which will exchange layered-cation with bentonite. Bentonite suspension exhibit shear thinning and rheopexy under shear rate is higher than 160(1/S).
Owing to thixotropy with CMC and rheopexy with bentonite, we try to find appropriate formulation for the thickener. After testing, C/B/M suspension system is approaching Newtonian after 24hour.
However due to phase out of CMC suspension, the thickener segregate. We use thickener polymers HEUR、HASE to replace CMC/Bentonite/Mica. The viscosity of HEUR and HASE is much more stable than CMC/Bentonite/Mica suspension.
CMC and Bentonite exhibit associative-thickening effect. Referring to formulation of CMC/Bentonite/Mica, we use with Bentonite PK-810 and found good adhesion to SiC and viscosity stability is increasing, the reason is presumed to that Brownian motion of particles. When particle size is decreased Brownian motion of particles is increasing, therefore viscosity stability is increasing and settlement of SiC powder will be reduced.
When SiC powder is added in vehicle, we found viscosity of slurry is increased rapidly in the condition that volume fraction of SiC exceeds 45 %. Yet the adhesion between HEUR、HASE and vehicle is not good, slurry is phase out after a while

並列關鍵字

rheology ； wire-sawing slurry ； shear-thinning ； thixotropic ； non-Newtonian flow

參考文獻

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[9] Jing Sun, Liao Gao, Dispersing SiC Powder And Improving Its Rheological Behaviour, Journal Of The European Ceramic Society 21 (2001) 2447-2451.

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