Electrokinetic Properties and Aggregative Stability of Polymer-Mineral Dispersions for 3D Printing in Building

An optical microscopy study showed that combination of a polymer with mineral components leads to coagulation of the dispersion. The electrokinetic potential and the modal particle diameter of multicomponent systems based on cement (or chalk) and polyvinyl acetate were found to depend on the polymer to mineral ratio. Modification of these systems with synthesized phloroglucinol-furfural modifier made it possible to obtain aggregation-stable polymer-mineral systems. It was proven that the electrostatic factor is not critical to the aggregative stability of polymer-mineral systems. As the modifier concentration increased from 0 to 0.3% of dry weight of the disperse phase, the absolute value of the zeta potential slightly increased to -30 mV. The peptization of the polymer-cement aggregates occurred almost to the size of primary particles of 6-7 mu m. The polymer-mineral dispersions are the basis for polymer-cement composites, which are promising materials for innovative construction technology.