Study on Rheological Behaviors of Ultrafine CaCO₃ Aqueous Suspensions Modified with Acrylate Macromolecular Modifiers

Abstract:

By varying the feed ratios of comonomers, butyl acrylate (BA), acrylic acid (AA), and methyl methacrylate (MMA), four acrylate macromolecular modifiers (AC730, AC532, AC235, and AC037) were synthesized by free radical copolymeration in ethnol. The effect of these modifiers on rheological behaviors of ultrafine CaCO₃ aqueous suspensions was investigated on the basis of a series of rheological measurements. The results showed that comonomer compositions and amounts of modifiers have obvious effect on rheological behaviors of CaCO₃ aqueous suspensions. In the case of AC730 and 0.2-0.4 parts of AC532, suspensions were pseudoplastic fluids, exhibiting shear thinning behavior; while in the case of AC235, AC037 and 0.6-1.4 parts of AC532, suspensions were dilatant fluids, exhibiting shear thickening behavior. Except the suspensions modified by 1.2 and 1.4 parts of AC730, the rheological data of other suspending systems could be well correlated with Herschel-Bulkley model. Optimum amounts of different modifiers were determined on the basis of rheological analysis, 0.8 parts for AC730, 0.6 parts for AC532 or AC235, and 0.4 parts for AC037.

• Periodical: Advanced Materials Research (Volumes 236-238)
• Pages: 1563-1567
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.236-238.1563
• Online since: May 2011
• Authors: Ou Sheng Zhang, Chao Can Zhang, Li Li Wu, Wen Bing Sun, Liang Hu
• Keywords: Acrylate Macromolecular Modifier, Calcium Carbonate, Rheological Behavior

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