Session 15: Adhesives & Sealants II
Chair: Michael R. C. Gerstenberger, Hinterwaldner Consulting, DEThe adhesives market is very diverse, working on many different fields of applications ranging from label and tape to laminating, automotive assembly or building formulations. Also adhesives and sealants are subjects to increasingly stringent health and safety legislation. This session focuses on latest developments in raw materials for epoxy, silicone and stryrene adhesives discussing new concepts for improved binder materials as well as properties and developments of curing agents and nanoscale fillers.
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Tuesday Afternoon 14.00 – 17.00 h
Room Seoul
15.1 14.00 – 14.30 h Silicone based adhesives – alternative curing reactions and properties Dr. Andreas Hartwig, Fraunhofer Institute for Manufacturing Technology and Applied Materials Research, DE Silicone based adhesives cure either by reaction with moisture or by a platinum catalysed addition reaction. Unfortunately the platinum is often destroyed by traces of numerous different compounds, like sulphur or tin containing contaminants. Furthermore it is difficult to prepare one part adhesives stable at room temperature and curable at moderate temperatures. The behaviour can strongly be improved by the application of non-metallic catalysts as alternative. Chemistry, material and adhesion properties will be demonstrated for silicones with this new curing mechanism.  | ||
| 15.2 14.30 – 15.00 h Reactive adhesives simplified with novel silane-terminates prepolymers Dr. Wolfram Schindler, Wacker, DE In today`s more environmentally aware world, adhesives and sealants are subject to increasingly stringent health and safety legislation. Regulatory changes across the globe require manufacturers to find substitutes for hazardous raw materials. WACKERs new range of silyl-terminated binders `GENIOSIL® STP-E` includes swift curing alpha-silane terminated grades. The unique silylation chemistry of these prepolymers ensures reliable binder quality. Moisture cured by alpha-alkoxy silane mechanism, this technology is not only avoiding hazards associated with monomeric isocyanates but also allow the formulation of entirely tin-free systems. Hybrid technologies are not new to the market. Yet it is often a challenge to couple suitable cure speed with the industrial requirements. GENIOSIL® STP-E can be easily formulated into products yet delivers that desirable balance of mechanical strength, swift cure and environmentally?optimized formulation ingredients. GENIOSIL® STP-E prepolymers have already found use in different applications like construction adhesives, wood flooring adhesives, industrial adhesives and DIY products. | ||
| 15.3 15.00 – 15.30 h Newly designed amorphous hydrophylic polymer Shusaku Mandai, Nippon Gohsei, JP NIPPON GOHSEI is pleased to introduce a new functional polymer - "Nichigo G-Polymer". By applying a very unique and exclusively developed technology, we are able to control the crystallinity of our new polymer independently from the degree of hydrolysis, without destroying the hydrogen bond structure inherent in such hydrophilic polymers. "Nippon Gohsei is the first company in the world to develop this technology" Nichigo G-PolymerTM simultaneously achieves mutually exclusive properties such as stretchability and high gas barrier; low melting point and high melt tension; strong emulsifying and anti-foam properties and so on. In our presentation, Nipon Gohsei will introduce Nichigo G-PolymerTM and it's superior performance in numerous applications. 15.30 – 16.00 h Networking: Refreshments & Coffee Break | ||
| 15.4 16.00 – 16.30 h Styrenic block copolymes with tailored block segments to meet adhesive market needs Martine Dupont, Krayton Polymers, FR Kraton Polymers, the technology leader in styrenic block co-polymers, offers a wide range of differentiated products to meet new market trends and needs. Block copolymers with tailored segments allow formulators to develop a wide range of adhesives like adhesives with a high proportion of ingredients from renewable resources, adhesives with excellent adhesion on polyolefinic substrates, adhesives with higher temperature resistance or adhesives with lower hot-melt viscosity for easier processing. These different requirements can be met by adjusting the chemical structure of the rubber midblock. Various polymers available for these developments will be presented and their use in different applications will be discussed with formulation examples. | ||
| 15.5 16.30 – 17.00 h Development and properties of innovative nanoscale fillers for controlled accelerator releae in reactive epoxy systems Dr. Michael Noeske, Fraunhofer Institute for Manufacturing Technology and Applied Materials Research, DE Modern coatings or adhesives basically are composed of highly developed organic polymer systems, additives and solid fillers. Often, the inorganic fillers contribute to application properties in the uncured state of reactive polymer systems, and mechanical or permeation properties of the resulting cured composites. The adhesion between the polymer system and the substrates and fillers plays a significant role in determining the strength and resistance of a resin/filler/substrate system. The strategy for developing innovative fillers presented here aims at supplying additional functionalities for particulate systems without essentially losing the forecited properties. The implemented approach profits from the nanotechnological concepts of function integration and interphase design. Such design requires knowledge and tools focused on quantitatively describing interactions between solid surfaces and organic monomers or polymers. Computer-based simulation may be applied to identify and finally tailor material combinations which then are introduced into chemical synthesis and engineering of novel nanocomposites to contribute to innovative coatings. In this context, the strategy and first results of studies focusing on the development of nano scale fillers with controlled release functionality will be reported. Such fillers were designed to basically be inert at room temperature, but to become thermally stimulated to release chemically active species at a temperature relevant for technical applications. Exemplarily, the temperature of the curing oven in a cataphoretic painting process was focused on. As an additional contribution to increasing the sustained yield of the still ongoing developments, controlled release could even be configurated to occur at lower temperatures than in current formulations which use permanently free reactive species. Computer-based simulation is shown to provide valuable information about sterically possible host/guest combinations, attainable loadings and release temperatures. Experimental evidence is presented for accelerators encapsulated in submicrometer-scale silicate host systems, used for curing one-component epoxy resins. Dicyandiamide cured epoxy formulations were prepared which exhibited a two month storage stability at room temperature, showed a curing temperature of 140 °C when investigated with differential scanning calorimetry using a linear 10 K/min ramp, and resulted in nano-composites with a glass transition temperature beyond 140 °C. The workings are funded by the German Federal Ministry of Education and Research (BMBF) within the project ""nanomodules"" (sponsorship label 03X0026E). | ||
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