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Rheology Control in High Solids Solvent Borne Coatings Containing Polymer Microgels

Published online by Cambridge University Press:  15 February 2011

L. J. Boggs ,
M. Rivers  and
S. G. Bike
L. J. Boggs
Affiliation:
Department of Chemical Engineering, University of Michigan, Ann Arbor Michigan 48109-2136.
M. Rivers
Affiliation:
Department of Chemical Engineering, University of Michigan, Ann Arbor Michigan 48109-2136.
S. G. Bike
Affiliation:
Department of Chemical Engineering, University of Michigan, Ann Arbor Michigan 48109-2136.
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Abstract

The focus of this work is to determine the type of interparticle forces that are primarily responsible for the rheology control of high solids solvent borne coatings containing polymer microgels. Rheological behavior is an important consideration when formulating high solids coatings due to the relatively low viscosities required for sufficient atomization during spray application and the difficulty of preventing the film from sagging during the bake cycle. Rheology control agents such as microgels are used to modify rheological properties where solvent evaporation is insufficient during the bake cycle to prevent sagging.

In this paper that describes the first phase of our work, we have characterized several microgel dispersions used as rheology control agents in high solids automotive topcoats using scanning electron microscopy (SEM) and steady shear viscosity measurements. The steady shear viscosity versus microgel volume fraction data was compared with the expected behavior of ideal hard sphere dispersions. One of the microgel dispersions showed very nearly ideal behavior while others deviated from the expected behavior at higher volume fractions. We have also investigated the steady shear behavior of increasing concentrations of microgel dispersions added to low molecular weight acrylic polymer, typical of resins used in high solids automotive coatings. These microgel dispersions induce a yield stress in the Newtonian resin that shows a strong dependence on microgel particle concentration.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 221
Copyright
Copyright © Materials Research Society 1993

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