Simulations and experimental investigation of paint film leveling
| Autor: | Oliver Tiedje, Matthias Schneider, Fabian Seeler, Christian Hager |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 2017 |
| Předmět: |
Thixotropy
Materials science Flow (psychology) Mineralogy Rheologie 02 engineering and technology 010402 general chemistry 01 natural sciences Viscoelasticity Physics::Fluid Dynamics Viscosity Colloid and Surface Chemistry Rheology Phase (matter) Newtonian fluid Fließverhalten Computer simulation Beschichten Surfaces and Interfaces General Chemistry Mechanics 021001 nanoscience & nanotechnology Nicht Newton Flüssigkeit 0104 chemical sciences Surfaces Coatings and Films Oberflächennachbehandeln 0210 nano-technology Simulation |
| Zdroj: | Journal of Coatings Technology and Research. 14:767-781 |
| ISSN: | 1935-3804 1547-0091 |
| DOI: | 10.1007/s11998-017-9934-5 |
| Popis: | The surface structure of a paint film is the result of the interplay of a variety of physical influences, e.g., the superposition of droplets during spray application, the surface tension-driven leveling, and the viscosity increase in the leveling phase. A numerical simulation program is presented that incorporates all the relevant mechanisms of paint film structure formation during and after spray application. The simulation program was validated by comparing simulations and leveling experiments. The influence of the initial film geometry and viscosity on the leveling behavior is demonstrated. For the investigations, model liquids and commercial paints with an increasing complexity of the physical properties were chosen: Newtonian flow behavior without solvent evaporation, Newtonian flow behavior with solvent evaporation, viscoelastic paints with non-Newtonian flow behavior. Four variants are proposed regarding how thixotropy can be measured and how a mathematical model can be created. The advantages and disadvantages of the variants with regard to the implementation of thixotropy in the simulations are listed. A method to predict the leveling behavior of thixotropic paints with simultaneous recovery of the viscous and elastic properties from rheological measurements using discrete relaxation time spectra is presented. |
| Databáze: | OpenAIRE |
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