Title
Water permeability of pigmented waterborne coatings
Author
Donkers, P.A.J.
Huinink, H.P.
Erich, S.J.F.
Reuvers, N.J.W.
Adan, O.C.G.
Publication year
2013
Abstract
Coatings are used in a variety of applications. Last decades more and more coating systems are transforming from solvent to waterborne coating systems. In this study the influence of pigments on the water permeability of a waterborne coating system is studied, with special interest in the possible interfacial layer of additives around the pigments. In our study an acrylate based binder is mixed with different glass sphere concentrations and sizes. Subsequently, the coating permeability is studied through wet-cup experiments and water uptake in the coating, either on a glass substrate or on wood, is monitored with NMR. These experiments show that water is absorbed more quickly by coatings containing glass spheres. From the experimental results it can be concluded that an interface layer around the pigment particles facilitates water migration and increases the effective diffusion. A modification of the effective medium theory is used to describe the observation and good agreement between experiments and theory is obtained. Both theory and experiment show that in a coating a layer around the pigments facilitates water transport and increases the effective diffusion constant. © 2012 Published by Elsevier B.V.
Subject
Building Engineering & Civil Engineering
BM - Building Materials
TS - Technical Sciences
Buildings and Infrastructure
Materials
Built Environment
EMT
Pigment
Polymer
Polymer-filler interaction
Coating system
Effective diffusion
Effective medium theories
EMT
Glass spheres
Glass substrates
Interface layer
Interfacial layer
Pigment particles
Polymer-filler- Interaction
Water migration
Water permeability
Water transport
Water uptake
Experiments
Filled polymers
Glass
Mechanical permeability
Pigments
Plastic coatings
Polymers
Substrates
Diffusion coatings
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TNO identifier
466420
ISSN
0300-9440
Source
Progress in Organic Coatings, 76 (1), 60-69
Document type
article