Session II: Novel Materials
Chair: LaMonte Adams, Supervisor Industrial Coatings Business, Dupont Performance CoatingsMonday Afternoon 2:00 p.m. – 5:50 p.m.
Breakout Room 217 A/B
Time and again, raw material suppliers as well as academic research institutions are coming up with coatings raw materials or procedures that offer fundamentally new tools to design, tailor, functionalize or improve coatings systems. Examples presented in this session include novel hardeners, new catalyst chemistries, polymer-designed surface modified particles, novel inorganic-organic binder systems, and atmospheric pressure plasma deposition techniques for engineering surfaces. | ||
2.1 2:00 – 2:30 p.m. Principles and Application Perspectives of LCST Driven Surface Modification Claus D. Eisenbach*, Nikolay Bulychev, Nehad Saleh, Frederik Wurst, Thadaeus Schauer, Research Institute for Pigments and Coatings, FPL, Germany The demixing of solutions of amphipolar copolymers upon temperature increase and the simultaneous polymer deposition onto dispersed particles or a flat substrate is a feasible method for specific surface modifications. As to the mechanism, the phase behavior of, e.g., aqueous poly(oxyethylene-ÿ-oxypropylene-ÿ-oxyethylene) 3-block copolymer solutions exhibits a lower critical solution temperature (LCST) following a nucleation and growth pattern; in the presence of pigments, a lowering of the LCST is observed. The polymer deposition onto the particle surface varies with the macromolecular architecture and the experimental conditions (including ultrasonic treatment) as revealed by electrokinetic sonic amplitude (ESA) measurements. Regarding application technology aspects, it has to be mentioned that employing copolymers with multifunctional reactive end groups allows for crosslinking. Besides improving and controlling the dispersing, the use of such encapsulated pigments is also well suited for the preparation of pigmented coatings with novel properties, e.g., exhibiting stratification phenomena. | ||
| 2.2 2:30 – 3:00 p.m. Novel TETA-Free Polyamides for 2K Epoxy Systems Marcelo Rufo*, Michael Cook, Gamini Vedage, Hiroya Morimoto and Dilip Shah, Air Products and Chemicals, Inc., Brazil The first commercial polyamides from C18 dimerized fatty acid with primary amines took place in the late 1940s. Since then, this class of polyamides has been widely used in 2K epoxy coatings and adhesives. Formulations based on these polyamides provide excellent adhesion, flexibility and corrosion resistance, and thus have found wide market acceptance in the marine and protective coating market sectors to provide protection to bridges, offshore platforms, and merchant shipping – both new builds and repair. Market dynamics for higher ethylene amines have resulted in significant price increases and potential tightness of supply of a key base amine, triethylenetetramine (TETA), used in polyamide manufacturing. In response to the raw material dynamics, an alternative, commercially viable amine stream has been identified. This new amine stream has a similar structure to that of TETA and as been evaluated as an alternative technology within the synthesis of base polyamides. This paper describes performance properties of a new class of polyamide that are either TETA-free or have reduced TETA demand, and that are designed to be performance offsets in existing commercial epoxy formulations. This innovative technology will allow the continuity of supply of polyamides at a competitive cost, with minimum reformulation work, and will augment existing business based on current high growth and continued demand in the coatings and adhesives’ sectors. | ||
| 2.3 3:00 – 3:30 p.m. Silixane-Binders Stefan Sepeur, Nano-X GmbH, Germany A new class of binders opens new possibilities for the production of functional coatings. These particular binders, termed silixanes, are synthesized by combination of silane chemistry with the principles of the conventional lacquer technology to highly molecular silanes. The variation of the structure of the organic function and of the organic side chain gives rise to completely new degrees of freedom with regard to the coating properties, in particular for the formulations of lacquers. Compared with the sol-gel technology the advantage is the cross-linking by “dry hydrolysis” (without water), by addition of inorganic catalysts based on transition metal complexes (e.g. Al, Bi, Ti). The technology justifies itsself particularly by the specific structure achieved, which is characterized by the fact that the organo-functional groups of the binder are already completely cross-linked. First tests on different surfaces coated with silixane-based formulations show excellent results. 3:30 – 4:00 p.m. Networking: Refreshments & Coffee Break | ||
| 2.4 4:00 – 4:30 p.m. New Sulfonic Acid Catalysts for Coil Coatings Ravi Ravichandran*, Ram Subrayan, Robert Coughlin, King Industries A new class of blocked sulfonic acid catalysts was developed for use in coil coating applications. Their unique deblocking profile makes them effective in coil primers and clear coats. They are non-interacting with basic anticorrosive pigments used in primers and help prevent popping, and contribute to good intercoat adhesion and corrosion resistance. In addition, increased stability of these catalysts facilitates single package coating compositions with extended shelf life. | ||
| 2.5 4:30 – 5:00 p.m. Overcoming Formulating Challenges to Obtain Adhesion to Low Surface Energy Plastics with UV Cured Systems Matthew Striewing, Lubrizol Coating low surface energy plastics with free-radical UV cured systems presents a unique set of challenges to the formulator and the finisher. Absent in a UV cured formulation are solvents or surfactants which can lower surface tension to obtain substrate wetting. Solvents can also swell substrate surfaces allowing for greater mechanical adhesion which is unavailable in UV cure. The reactive diluents in UV formulations cannot swell inert low surface energy plastics. And unlike solventborne and waterborne coatings, UV coatings have additional unique challenges which effect adhesion, including coating shrinkage. By introducing a novel polymeric raw material to UV coating formulations, adhesion to low surface energy plastics can be obtained without the use of substrate pretreatments or primers. This is achieved by the raw material’s ability to increase surface wetting, increase the Van-der-Waals-attraction of the coating to the substrate, and not contributing to coating shrinkage when cured. The incorporation of this material to UV cured coatings formulations which had no adhesion to polypropylene and thermoplastic polyolefin substrates results in drastically improved adhesion performance. Additional coating performance is not detrimentally affected. | ||
| 2.6 5:00 – 5:30 p.m. Photocatalytically Active Titanium Dioxide in Coatings and Construction Materials A. P. (Steve) Valente, Kronos Worldwide In the past few years, new titanium dioxide products have been developed with increased photocatalytic activity. Activation is accomplished via ultraviolet or visible light source. This paper provides an overview of the technology. Further, the paper will demonstrate how coatings formulated with photocatalytically active titanium dioxide destroy organic pollutants. | ||
| 5:30 – 5:50 p.m. Poster Previews 5:50 – 7:30 p.m. Full Poster Session/ Networking: After Work Party In conjunction with the poster session, conference delegates, chairpersons and speakers are invited to meet in a relaxed atmosphere immediately after the end of the oral conference program on Monday, June 2, 2008. The After Work Party of the American Coatings Conference is an ideal opportunity to renew and strengthen contacts, cultivate business relationships, exchange latest news and participate in discussions, as well as enjoy refreshments, a beer and music. | ||
| << Previous Session | >> Next Session |
