Rheological behaviors of ball-milled and wet-jet milled ZnO slurries with polyvinyl alcohol as an organic binder

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Fluidity of wet-jet milled and ball-milled ZnO slurries containing polyvinyl alcohol (PVA) was investigated from rheological behaviors and centrifugal separation. The viscosities of wet-jet milled ZnO slurries were much small as compared to ball-milled ones irrespective of the solids loading and PVA contents. At 30 vol % of high solids loading, the viscosity of wet-jet milled slurry with PVA was decreased to one-ninth of ball-milled one. From the creep-recovery measurements, the ball-milled slurry with PVA showed the elastic property, while the wet-jet milled one with PVA showed the liquid-like property. Therefore, the fluidity of wet-jet milled ZnO slurry with PVA was much higher than that of ball-milled one, indicating that the adsorption affinity between wet-jet milled particle and PVA was weak as compared to ball-milled one with PVA. From the centrifugal separation test, it was found that the relative packing densities of the precipitates prepared from wet-jet milled particles was high as compared to those prepared from ball milled ones due to the difference of adsorption affinity. Hence, the fabrication of weak adsorption affinity between ZnO particle and PVA leads to high fluidity of high solids loaded slurries with an organic binder like a chain polymer.
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