| 12:30 - 13:30 uur |
Registration with lunch |
| 13:30 - 14:15 uur |
Jaarlijkse Algemene Ledenvergadering
Opening by Andre van Linden - Chairman NVVT |
| 14:15 - 15:00 uur |
Dispersion of Solid Particles
- Jochum Beetsma, Meritus Groep
The process of dispersion and stabilisation of solid particles (pigments and fillers) is important in paints. To prevent unnecessary work, the basics of the 3 steps to get from a dry power to a stable dispersion (wetting, separation and stabilisation) must be understood. Also, key information about the raw materials is needed. Technical Data Sheets, providing information about properties and behaviour of raw materials, are often vague, confusing or incomplete. We discuss examples of raw materials that are used to make dispersions of solid particles, analyse what their TDS documents tell us and whether or not this agrees with the theory of flocculation and sedimentation. |
| 15:00 - 15:45 uur |
Water-borne topcoats, it's the final flow that makes the coating shine
- Dr. A.J. Reuvers & A.Veurink
How to achieve a high-gloss surface for a water-borne coating drying on top of an uneven substrate? To answer this question, we measured the gloss level of dried alkyd topcoats as a function of a series of variables, such as topography of the primer substrate, topcoat thickness and solid content of the freshly applied paint. Also, we examined the impact of the binder viscosity and reactivity on the gloss of the dried topcoat.
Surface gloss is known to be related to the surface topography. Using a white light interferometer, we monitored the surface topography of alkyd topcoats, as it evolves during drying. Two separate stages in the evolution of surface topography could be distinguished. Gloss fully recovers, only if the solid topcoat displays sufficient flow. This (final) flow is promoted at increasing topcoat thickness, decreasing binder viscosity and decreasing binder reactivity.
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| 15:45 - 16:15 uur |
Break |
| 16:15 - 17:00 uur |
Silicon based coating chemistry, challenges and opportunities of a novel chemistry
- Thijs Tuinstra, Nano Composites Applied Technologies
Developing fossil-free coatings is a challenge for chemists. Silicon (Si) is an element below carbon in the periodic table and therefore is an interesting candidate for replacing carbon. Since 60% of the earth crust is silicon dioxide, silicon is more abundantly available than oil. The research describes the possible chemistry of some novel coating concepts of base 1K and 2K cured coatings using silicon based minerals and inorganic polymers. The presentation describes some history and background of similar coatings and why coating chemists should work in this interesting field. The details of chemical and physical properties of existing coatings are discussed.
|
| 17:00 - 17:45 uur |
Reduced complexity:inherently matte acrylics and cationic functionality without compatibility issues
- Nadir Boudra, Zschimmer & Schwarz
Using a proprietary process, Zschimmer & Schwarz offers an inherently matte acrylate polymer. After drying, a film with low gloss, high flexibility, excellent stability and, above all, excellent transparency is formed. The time- and labour-consuming incorporation of solid matting agents is eliminated, making the formulation much simpler, more stable and more economical.
The IPN technology (interpenetrating polymer network) of Zschimmer & Schwarz involves two different ionic structures in the same polymer network at a neutral pH value. These polymers form cationic functionalities during drying, providing excellent tannin, stain and dye blocking without the compatibility problems common to cationic polymers.
This talk outlines how these innovative polymer technologies benefit applications in graphic arts or wood coating, meeting the increasingly demanding requirements of modern coating formulations.
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| 17:45 - 18:15 uur |
Closure with appetizers and drinks |