American Coatings Show 2018

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5.6 Effects of Latex and Thickener Hydrophobicity on the Rheology and Stability of Aqueous Latex-HEUR Mixtures (Room 243-245)

Results of our recent studies towards understanding the mechanisms of flocculation, syneresis, and rheology of commercial and model latex and HEUR (Hydrophobically-Modified, Ethoxylated Urethane) mixtures will be presented. Previous work with commercial latexes and HEUR thickeners established a correlation among the bridging flocculation of latex particles with HEUR thickeners with their syneresis and shear-thickening viscosity behavior. However, establishing direct evidence of the mechanisms was not possible due to the unknown nature of structural details of the commercial products. The use of well-characterized model latexes and thickeners and the use of an additional characterization technique, diffusing wave spectroscopy, allowed effective probing of mechanistic details of the latex-HEUR interactions, which are consistent with models previously reported for commercial materials.