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Drying, Film Formation and Open Time of Aqueous Polymer Dispersions
An Investigation of Different Aspects by Rheometry and Inverse-Micro-Raman-Spectroscopy (IMRS)
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- Drying, Film Formation and Open Time of Aqueous Polymer Disp
- Zur Erlangung des akademischen Grades eines
- + Dipl.-Ing. Imke Ludwig
- (I) Latin Letters:
- Greek Letters:
- (III) Indices:
- + Introduction
- + Aqueous Polymer Dispersions
- + Rheology of Polymer Dispersions
- + Mechanism of Film Formation
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+
Local Concentration Measurements (by IMRS)
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+
Model Calculations
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+
Results and Discussion
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+
Rheology of Aqueous Latex Dispersions
- Rheological Investigation of the Concentrated Dispersions
- Rheological Properties as a Function of the Water Content X
- Viscosity Functions
- + Liquid-Solid Transition
- + Influence of Additives on the Rheological Properties
- Investigation of Film Leveling
- Influence of Additives on the Leveling of AS-H-1a
- Conclusions on Dispersion Rheology and Film Leveling
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+
Water Evaporation and Film Drying
- + Parameters Necessary to Describe Drying
- Film Drying Experiments using Inverse-Micro-Raman-Spectrosco
- Homogeneous Drying in Vertical Direction of the Film
- Influence of Different Drying Parameters on the Evaporation
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+
Inhomogeneous Drying in Horizontal Direction of the Film
- (I) Gravimetric Drying Experiments
- (II) The Time-Dependent Evaporation Area A(t)
- (III) Enforced Horizontal Mass Flow (e.g. by Air Flow, Tempe
- (IV) Suppressed Horizontal Mass Flow (by Artifical Borders)
- (V) Measurements at Different Horizontal Positions of the Fi
- (VI) Horizontal Water Concentration Profiles in Thin Coating
- Conclusion on Horizontal Inhomogeneous Drying
- Drying of Polymer Solutions
- + Irreversible Particle Contact and Particle Deformation
- + Particle Coalescence and Film Ageing
- + The Influence of Pigments on Drying and Film Formation
- + Influence of Additives on Drying and Film Formation
- + Aqueous Polyurethane (PU) Dispersions
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+
Rheology of Aqueous Latex Dispersions
- + Conclusions
- + References
The application properties and the final coating properties of waterborne polymer dispersions are poor compared to the ones of polymer solutions with organic solvents. This is expressed by a short open time and by inhomogeneities and defects that are visible in the final dry coating. Aim of this work is an investigation and discussion of the different aspects that are responsible for the poor application and coating properties of aqueous latex dispersions by experiments and model calculations.
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Publication year : 2008
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