Viscoelastic Behavior of Water-Based Inkjet Inks, and the Estimation of Viscoelastic Constants of the Single Relaxation Model

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  • 水性インクジェットインクの粘弾性挙動と単一緩和仮定による諸物理量の推定
  • スイセイ インクジェットインク ノ ネンダンセイ キョドウ ト タンイツ カンワ カテイ ニ ヨル ショ ブツリリョウ ノ スイテイ

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Viscoelastic behavior of water based inkjet inks, which cannot usually be measured by Rheometer because of their low viscosity, was observed by new method of viscoelastic measurement known as resonant method.<br>The object of observation was two series of inks based on chemically surface modified carbon black, one contained added resin particle dispersion and the other contained added resin solution.<br>To analyze the viscoelastic behavior of these inks in full detail, we propose a new method to calculate the viscoelastic constants η∞, η, τ and G of the single relaxation model and these constants were calculated for each series of inks. The dependency of these constants η∞, η, τ, G or absolute value ηab and phase angle δ of complex viscosity, on the content of the resin particle or resin solution was examined. The temperature dependence of ηab and δ was also investigated.<br>In the system containing resin as particle dispersion, G and η∞ show cubic increase as the content of resin increases. On the other hand in the system containing resin as solution, these constants increase linearly.<br>For both series of inks, the values of τ decrease linearly as the resin content increase. The resin particle shows the same behavior as particles of carbon black, but addition of resin solution result in changes to the solvent properties. The principle of the resonant method of viscoelastic measurement is explained in detail, based on theory and the experimental results from this study.

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