Session 3: Powder Coatings
Chair: Emmanouil Spyrou, Evonik Degussa, DEPowder coating is still an up-to-date technology. Its materials can provide high-quality, durable, corrosion-resistant coatings. Powder coatings have many advantages over other coating processes like zero/near zero VOC emissions, even though there are limitations to the technology. In this session an alternative to fluorine-based hyperdurable powder coatings will be looked at. Other topics are polyester powder resins for corrosion protection and new powder coating resins for superior matte finishes.
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Monday Afternoon 14.00 - 17.00 h
Room Kopenhagen
3.1 14.00 – 14.30 h Early results in the quest for an alternative to fluorine-based hyperdurable powder coatings Dr. Luc Moens, Cytec Surface Specialties, BE Powder coating has been used for many years in architectural applications such as aluminum profile , but beyond European borders it has been unable to capture as much market share Typically paint manufacturers promote PVDF based liquid paints in regions where high exposure to UV leads to more stringent requirement for the paint. This is the case in the US, South East Asia and more locally in Middle Eastern countries. Powder makers have tried to adapt PVDF technology to solid paints, but as of today there are problems of technological compatibility as well as prohibitively expensive raw material costs. We have initiated a long-term development project to try and address these emerging market needs particularly in trying to develop alternative technologies to fluorine based materials such that the weathering resistance of the powder paint is improved well beyond the current super durable systems. In this article we will review the drivers for change in the market and illustrate the potential improvements possible which indicate non-fluorine containing systems can achieve significant improvements in terms of their UV resistance.  | ||
| 3.2 14.30 – 15.00 h Polyester powder resins for excellent corrosion protection Dr. Paul Vercoulen, DSM Powder Coating Resins, NL Corrosion protection is one of the most valuable properties of coatings. Current market dynamics demand environmental friendly and good performing coating systems at attractive system costs. Powder Coatings in general are well known for high corrosion resistance in combination with pre treatment and or primers. The corrosion requirement for a specific application determines the total system build. DSM Powder Coating Resins has developed a polyester resin system that provides exceptional good corrosion protection on steel under natural salt spray conditions. Electrical Impedance Spectroscopy measurements support the excellent corrosion resistance even when there is no chemical pretreatment. In direct comparison we obtain epoxy-like corrosion protection. This development therefore leads to good corrosion protection whilst at the same time reducing the environmental footprint. Main focus of the presentation will be on application results for the resins developed for Primid cure. A comparison with other commonly used systems will be presented. | ||
| 3.3 15.00 – 15.30 h Rheokinetic modeling of epoxy powder coatings Dr. Fabio Aguirre, Dow Coating Solutions, US Epoxy powder coatings flow behavior is determined by kinetics and rheology during curing. The balance between kinetic and rheology will determine the final properties of the polymer and the adhesion to the substrate. In this paper we will discus the use of kinetic and rheological models to predict the melt viscosity and curing behavior of Epoxy powder and how it can be used to improve the physical properties of the coating. 15.30 – 16.00 h Networking: Refreshments & Coffee Break | ||
| 3.4 16.00 – 16.30 h Thermosetting polyamide resins for low temperature cure powder coatings Marcel Schutte, DSM Powder Coatings Resins, NL DSM Powder Coating Resins has developed amorphous thermosetting polyamide resins that offer a unique set of properties over polyesters that have dominated the powder paint market for the past decades. Thermosetting polyamide based powder coatings demonstrate enhanced chemical resistance whilst their higher reactivity enables their use in coating non-metallic surfaces such as MDF and/or plastic. This paper will focus on the development and application of polyamide resins for low temperature cure (110-130ºC) powder coatings. In particular, typical film properties of carboxyl functional polyamides formulated with commercial epoxy cross-linkers will be presented. | ||
| 3.5 16.30 – 17.00 h New powder coating resins for superior matte finishes Dietmar Fink, Cytec Surface Specialties, DE Today a number of technical solutions exist for producing matte powder coatings - matting agents or so-called dry blend technology whereby two ready-made powders of different reactivities are mixed and re-ground. However, these systems do not offer satisfactory results in terms of reliability and reproducibility, in particular for gloss levels ranging from 15 to 40 percent - as measured at 60° reflection angle. Cytec has been developing new solutions for such applications including a patent-pending technology for producing matte finishes in one extrusion. The novel binder systems enable the manufacture of controlled-gloss paints with gloss levels between 10 and 40 percent for both standard and super durable grades. In this article, a selection of results will be presented showing how it is possible to improve reproducibility and reliability significantly in the production of attractive matte finishes in powder coatings. | ||
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