Session 4: Smart Coatings
Chair: Dr. Anders Larsson, Ytkemiska Institute AB, SESmart coatings are often referred to as structured coatings which provide additional benefits by giving an appropriate response to outside conditions. Much talked about are self-healing or super hydrophobic and hydrophilic coatings, to name only a few. More examples will be given in this session, comprising self-healing coatings as well as superprimers from stimuli-responsive nanolatexes and thermoresponsive pigmented coatings. Other interesting developments are anti fingerprint and anti ice coatings.
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Monday Afternoon 14.00 – 18.00 h
Room Seoul
4.1 14.00 – 14.30 h Self-healing coatings - new technology developments Dr. Sandra Hofmann von Dow Europe GmbH, CH Self-healing coatings are emerging technologies that employ smart materials. Such materials respond to external stimuli or adapt to circumstances just like one encounters in biological systems. In particular, a fundamental property of biological systems is their ability to heal after a physical insult. While these processes are inherently complicated, simple prototypes have been adopted by scientists to tackle healing in material systems. Analogous and ingenious approaches have been developed to address the auto-response of a material to repair itself after it has been compromised. In this paper, an overview of self-healing coating technologies will be presented. Design requirements for coatings that are opposing will be discussed in the context of a new approach to self-healing. Specifically, the material science of recovery, scratch resistance and acid-etch resistance will be discussed for emerging materials to meet these requirements.  | ||
| 4.2 14.30 – 15.00 h Development of self-healing elastomeric coatings Gerald Wilson, Autonomic Materials, US Self-Healing polymers are a new class of smart materials, which have the capability to autonomically repair themselves after damage, without the need for detection or repair by manual intervention [1]. The original self-healing systems were based on the Grubbs catalyst-initiated ring opening metathesis polymerization (ROMP) of dicyclopentadiene (DCPD). This ROMP-based self-healing system presented some challenges with regard to the economics, chemical compatibility and thermal stability required for commercial applications. To expand the scope of practical applications, new self-healing chemistries have been developed and evaluated for use in a wide variety of applications including coatings. In this paper, we discuss the development of these new self-healing chemistries and their application specifically in elastomeric coatings. Reference: [1] White, SR, Sottos, NR, Geubelle, PH, Moore, JS, Kessler, MR, Sriram, SR, Brown, EN, Viswanathan, S (2001) Nature, 409:794-797. | ||
| 4.3 15.00 – 15.30 h Superprimers from Stimuli-Responsive Nanolatexes Prof. John Texter, Eastern Michigan University, US The application of a photocatalytic active coating on a metal substrate can be seen as one approach to generate a selfcleaning (or aircleaning) metallic construction part like e.g. a roof part. In order to stay most flexible in terms of colour the photocatalytic function itself should not influence the transparency/colour of the coating. Furthermore especially a sufficient stability of the used binder system towards photoactive TiO2 is a key issue to provide a coating not only having academic character but for real life. In a joint work of Arcelor-Occas and Sachtleben a transparent coating for metal substrates with high photocatalytic activity has been developed. The properties of this coating regarding photocatalytic activity, transparency, weatherability, adhesion and corrosion resistance etc. will be presented. 15.30 – 16.00 h Networking: Refreshments & Coffee Break | ||
| 4.4 16.00 – 16.30 h Thermoresponsive pigmented coating exhibiting superhydrophobicity and superhydrophilicity Dr. Syed Haseebuddin, Asian Paints, IN Globally extensive research efforts are being directed towards self-cleaning and stimuli responsive coatings. Self-cleaning coatings are normally either superhydrophobic or superhydrophilic. Stimuli responsive coatings that can switch between hydrophobicity and hydrophilicity have been reported in literature. However, the preparation of self-cleaning as well as stimuli responsive coatings involves the use of complex procedures. We report self-cleaning pigmented waterborne coatings exhibiting thermoresponsive behavior by a simple technique. Random copolymers based on amino functional monomers were synthesized by conventional free radical polymerization. The coatings were designed by combining these polymers with functionalized pigments. They were applied by conventional techniques such as brush and spray application exhibiting superhydrophobicity at high temperature and superhydrophilicity at low temperature. | ||
| 4.5 16.30 – 17.00 h Photocatalytic active transparent coatings on metal substrates Anna Kotnis, ArcelorMittal, BE The application of a photocatalytic active coating on a metal substrate can be seen as one approach to generate a selfcleaning (or aircleaning) metallic construction part like e.g. a roof part. In order to stay most flexible in terms of colour the photocatalytic function itself should not influence the transparency/colour of the coating. Furthermore especially a sufficient stability of the used binder system towards photoactive TiO2 is a key issue to provide a coating not only having academic character but for real life. In a joint work of Arcelor-Occas and Sachtleben a transparent coating for metal substrates with high photocatalytic activity has been developed. The properties of this coating regarding photocatalytic activity, transparency, weatherability, adhesion and corrosion resistance etc. will be presented. | ||
| 4.6 17.00 – 17.30 h Advances in anti fingerprint coatings Steven Block, Dow Corning Corporation, US Keeping surfaces free of contamination from fingerprints and dirt, as well as making them easier to clean, is an active field of research and technology development. Recent advances in the hybridization of perfluoropolyether polymers modified with organofunctional silanes have led to unique stay clean and easy to clean surface properties. Creating an anti fouling surface on a variety of substrates has many advantages from a reduced need for cleaning to improved safety. Hydrophobic and oleophobic properties obtained with polymeric coatings containing fluorine and silicon result in very high water and oil contact angles and good roll off properties. Weather resistance, UV durability, and scratch resistance are achieved by the inclusion of alkoxy silane reactive components. This coating technology is suitable for use on glass, metal, and many common plastics like acrylic, PMMA, and polycarbonate. Cost effectiveness in the intended applications is achieved to ensure sustainability of this high performing material. | ||
| 4.7 17.30 – 18.00 h Progress in anti-ice technologies – coatings concepts and evaluation Nadine Rehfeld, Frauenhofer Institute for Manufacturing and Applied Materials Research, DE The prevention of ice accretion on surfaces has been investigated since decades by workgroups all over the world. However, a currently more realistic aim for coatings seems to be the reduction of ice adhesion forces rather than the complete prevention of ice. Issues to be taken into account are the different types of icing as well as the additional requirements a coating must fulfil. Nevertheless, experts of the Fraunhofer IFAM work on the formulation of promising Anti-ice concepts, including the development of reliable test methods. This paper summarises the work that has been completed with the latest results. The following approaches are included: Hydrophobic coatings, mainly combined with Surface structuring via nano- or micro-scaled particles; Linking of Anti-freeze proteins on coatings. The developed tests for the evaluation of the icing behaviour, including ice chamber tests and adhesion tests as well as natural icing conditions are also presented. | ||
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