Study on Rheology of Paper Coatings with Starch-Based Bio-Latex

The rheology of self-made starch based bio-latex and paper coatings were investigated, together with coated paper properties. The results showed that low shear viscosity of bio-latex was remarkably less than that of petroleum-based latex emulsion, and high shear viscosity was almost kept consistent as shear rate increasing, complying with the Newtonian fluid model. The addition of starch based bio-latex to paper coating colors resulted in low shear viscosity decrease and water retention value slight increase, while the high shear viscosity was nearly same with the coating without bio-latex as shear rate exceeding 10 000 s-1. With lower elastic storage modulus G' and viscous loss modulus G, and higher phase angle δ, paper coatings containing bio-latex were more like viscous liquid than the control coating. Besides, the results also showed that physical properties and printing performance of coated paper with new binder were comparable to the control one.