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Article: Rheological Approach to the Capillary Penetration of Coating Into Wood.
- Article from:
- The Journal of Coatings Technology
- Article date:
- March 1, 2001
- Author:
CopyrightCOPYRIGHT 2001 Federation of Societies for Coatings Technology. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Holger Militz [+]
SHR Timber Research [*]
The penetration of water-and solventborne binders into the capillaries of wood was studied as a function of the viscosity, surface tension, and capillary pressure according to the Washburn equation.
During the penetration, water is selectively removed from the coating, which causes a strong increase in viscosity that limits the penetration. Waterborne dispersions and emulsions showed a rapid increase in viscosity with increasing solid matter content. Surface tension of the binder and the adsorption of surfactants to the wood have an additional influence on the maximum penetration.
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