Session 9: Adhesives & Sealants
Chair: Stephan Hinterwaldner, Hinterwaldner Consulting, DEStarting with an overview of drivers of the global adhesives business the focus of this session lies on new developments and innovations of pressure sensitive adhesives (PSA). Different applications, including medical applications and direct usage on complex geometries will be addressed as well as new binder technologies. Additionally the principle of nanotechnology in PSA will be presented just as developments in waterborne systems.
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Tuesday Morning 9.00 – 13.00 h
Room Seoul
9.1 9.00 – 9.30 h Drivers of growth for the worldwide adhesives business Dr. Jürgen Wegner, ChemQuest Europe, DE Booming energy prices coupled with rising awareness for climate change, CO2 footprinting, material, resource, and energy efficiency all boost the use of highly specialized adhesives and sealants. Wind energy generation is just one example for double digit growth even in otherwise flat economies, as is photovoltaic solar panel manufacture, new LED and flat screen technologies, the rising usage of composite materials even in standard applications, cars and airplanes with much improved fuel efficiency, and energy efficient white goods. New building codes around the world require more efficient insulation, and this directly translates into new market opportunities for both, new and existing buildings. Why and how adhesives and sealants benefit from those over-arching trends, will be addressed in this presentation, as will be the identification of those shortcomings still preventing their optimal & maximal usage. Still unmet needs include deficiencies in recycling without downcycling, assembly speed limitations, and over-all handling and workplace conditions, not to forget vast knowledge limitations about adhesives and sealants on specifier level in general.  | ||
| 9.2 9.30 – 10.00 h How to create new blockbuster technologies? Melanie Roessing, Evonik Goldschmidt, DE The adhesive market is very diversive, working on many different fields of applications ranging from label and tape to laminating, automotive assembly or building formulations. All those applications have very different demands, but there is one question, which is the same for every adhesive producer: ?How shall I choose the right raw materials for the formulation of my adhesive?? Especially the smallest part of a formulation, namely the additives, is very challenging. By adding just a droplet you may change your adhesive to a blockbuster or to a maximum credible accident. Therefore an extensive knowledge of the effects of additives, their working mechanisms and the undesired side effects they might create, is invaluable. Each type of additives selected from the range of antifoams, wetting agents, dispersing aids or thickeners bears different peculiarities, which need to be understood very well, to create innovative new adhesive formulations. All this and the well known pressures on the adhesive formulators coming from REACh and other regulations define today?s high demands on new innovative ideas for adhesives. By showing a unique and outstanding performance, novel additive technologies will support adhesive formulators to create real blockbuster technologies. | ||
| 9.3 10.00 – 10.30 h Acrylic pressure-sensitive adhesives with post-crosslinking potential Dr. Roland Milker, Dr. Milker Firmengruppe, DE The limitation of pressure-sensitive adhesives (PSA) is their lack of cohesive strength to stand high loads. The most important and interesting features of acrylic pressure-sensitive adhesives for the production of various self-adhesive materials are acrylic copolymers with post-crosslinking potential. The present research and developmental work relates to acrylic pressure-sensitive adhesive compositions which can be further crosslinked after having been applied to a substrate, making them behave like semi-structural adhesives. More particularly, the present paper describes acrylic PSA based on a mixture of an acrylic self-adhesive polymer containing hydroxyl, carboxylic or epoxy type of functionality and a dual curing system combining room temperature and thermal reactive crosslinking agents. A double-sided bonding tape coated with the novel acrylic PSA with post-crosslinking potential may be used to bond a wide variety of materials including steel, aluminum, glass and ceramics, stone and ferrite applied in the aerospace and other industries. 10.30 – 11.00 h Networking: Refreshments & Coffee Break | ||
| 9.4 11.00 –11.30 h Novel pressure-sensitive adhesives for medical applications Dr. Jagrjaj Sidhu, Ashland, GB Novel acrylic polymerisation techniques have demonstrated unparalleled control of the resin architecture resulting in polymers with unique properties which are suitable for the two main medical markets; medical devices i.e. fixation and pharmaceuticals i.e. drug delivery. Studies have focused on the key requirements for such products ? biocompatibility i.e. non-cytotoxic, non-irritating and non-sensitizing. Results will be presented that will prove the novel polymers for fill the high demands of many medical applications. The market clearly indicates the need for products that posses high moisture vapour transmission rates (MVTR) ? breathable whilst maintaining a range of adhesion levels to skin i.e. low, medium & high. These novel products can be used with fabrics, films & foams are able to adhere to a range of skin types which can be deactivated either by heat or UV radiation. | ||
| 9.5 11.30 – 12.00 h Direct application of PSAs on complex geometries Thomas Frauenhofer, ISF Welding, Aachen University, DE The automated application of pressure sensitive adhesives is limited to simple geometries. Application to complex 3-D contours can be done only with great effort using adhesive tape. The Institute for Joining and Welding developed a new technology which allows pressure sensitive adhesives to be applied directly to the part. The adhesive is applied viscously to the part, and after a short time is converted into a pressure sensitive adhesive using UV-interlacing. Besides the simplification of the adhesive application, there is also higher adhesion to surfaces, especially those with lower energies. This is because the adhesive can interlace better to the part when it is in a viscous state, and thereby creating greater adhesion. The following paper presents the most current results from this project. | ||
| 9.6 12.00 - 12.30 h Nanotechnology inside for pressure-sensitive adhesives: How does it work? Costantino Creton, ESPCI, FR Innovations in the pressure-sensitive-adhesives (PSA) field often claim to take advantage of nanotechnology to structure the material. Yet few explanations actually exist on why designing adhesives to be heterogeneous at the nanoscale could be useful for. We have focused in the EU project Napoleon on designing urethane-acrylic and clay-filled acrylic hybrid PSAs using miniemulsion as a synthetic method. The resulting PSA are heterogeneous at the particle scale and have distinctly different macroscopic properties from their homogeneous counterparts. The effect of these heterogeneities on mechanical and adhesive properties has been systematically investigated with our custom-designed tools. We will show that colloidal particles present unique opportunities to structure the adhesive film and tailor the mechanical properties and in particular the large strain properties which are crucial for PSA’s, to go beyond the usual trade-off in cohesion/adhesion properties. We will present some general rules that are useful when designing a heterogeneous soft adhesive material. | ||
| 9.7 12.30 – 13.00 h Formulations and compounding of butyl rubber and EPDM rubber sealants Shrikant Athavale, Focus Air Conditioning, IN Formulaions of Binder Coating and Pressure sensitive Adhesive coating, for the manufacture of Alkali Resistant Fiber Glass Mesh, as well as Dry wall jointing Tapes, use in Construction Industry, in large quantities.The binder caot as well as the PSA is water bourn, and specially compounded for optimum properties , with Alkali as well as acid resistance, and Flame retardantancy | ||
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