Effect of binder addition on optimum additive amount of dispersant for aqueous BaTiO3 slurry |
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| Affiliation: | 1. Department of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, U.P., India;2. Department of Metallurgical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, U.P., India;1. School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000, PR China;2. State Key Lab. For Turbulence and Complex Systems (LTCS), College of Engineering, Peking University, Beijing 100871, PR China;3. Wujiang CSG Huadong Architectural Glass Co., Ltd., Wujiang 215222, PR China |
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| Abstract: | In ceramic wet-shaping processes, the effects of the addition of binder is seldom taken into account when determining the optimum amount of dispersant to be used. Hence, in this study, the effect of the addition of PVA, which is commonly used as a binder, on the particle dispersion state of aqueous BaTiO3 slurry was investigated. Dispersant adsorption, rheological characteristics evaluation, and sedimentation tests were conducted on slurries with and without PVA addition. The slurry with 2 mg?g?1 PCA but no PVA was well dispersed; however, the addition of PVA caused significant aggregation. Although slurries containing more than 4 mg?g?1 PCA plus PVA were more aggregated than those without PVA, the amount of aggregation was less than that with 2 mg?g?1 PCA. The aggregation mechanism was the interaction between PCA as a dispersant and PVA, with the degree of aggregation depending on the amount of non-adsorbed PCA. |
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| Keywords: | Dispersant Binder Particle dispersion state Aqueous slurry polycarboxylic ammonium (PCA) Polyvinyl alcohol (PVA) |
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