in-adhesives

We stay on track!

Agenda February 18-19, 2020

Tuesday, February 18, 2020
// 08:00
Registration open
// 08:45
Welcome and introduction
// 09:00 – 09:25
NOVEL RESORBABLE HYDROGELS AND ADHESIVES BASED ON LEVAN
Dr. Ralf Wyrwa*, Albrecht Berg, Matthias Schnabelrauch
INNOVENT e. V., Biomaterials Department: DE-Jena
NOVEL RESORBABLE HYDROGELS AND ADHESIVES BASED ON LEVAN
Dr. Ralf Wyrwa*, Albrecht Berg, Matthias Schnabelrauch
INNOVENT e. V., Biomaterials Department: DE-Jena
Levan is a fructose polysaccharide available by fermentation or enzymatic transformation of sucrose. Currently, levan is mainly used as auxiliary material in food and cosmetic industry. Although high molecular-weight levan is known for its unique properties, only very few papers have been published about controlled chemical functionalization to generate new, functional biomaterials usable in hydrogels or adhesives.
For that reason our aim was the introduction of different functional groups into levan forming cross-linkable macromers. We focused on two strategies, a chemical covalent cross-linking as well as a physical one.
For chemical cross-linking we studied the photo-crosslinking reaction of levan derivatives containing unsaturated groups. These levan derivatives were prepared by reacting levan with different reactive methacrylates (methacrylic anhydride, glycidyl methacrylate, isocyanatoethyl methacrylate). Different photo-initiation systems and irradiation conditions were used to study the cross-linking reaction.
Levan derivatives able to form physical cross-linkages can be prepared by introducing oligomeric lactide side chains of different length. Mixing of solutions of oligo-D- and L-lactide-substituted levans lead to twisting of D- and L-lactide side chains resulting in the formation of hydrogels.
The obtained macromers were characterized using conventional analytical techniques (FT-IR, NMR). Application-relevant physical (swelling and mechanical behaviour) and biological (in vitro cytocompatibility and degradation, respectively) properties of the levan-based materials have been studied.

Finally, a series of cross-linkable levan derivatives containing methacrylate groups or D- and L-oligo lactide side chains, respectively have been prepared and characterized. Cross-linking of these macromers resulted in materials of diverse mechanical and swelling properties dependent mainly on the degree of substitution and the conditions of cross-linking. The hydrolytic in vitro degradation of photo-crosslinked hydrogels is relatively. All prepared hydrogels show a good cytocompatibility.

Levan-based macromers and their cross-linked hydrogel derivatives represent a new class of biopolymer-based macromers broadening the range of nature-based materials with adjustable properties. These materials have a high potential for adhesives, coatings, drug delivery formulations and matrices in soft tissue repair.

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// 09:25 – 09:50
VERSATILE INNOVATIVE ADHESIVES FOR MEDICAL IMPLANTS
Francois Martin
Elkem Silicones; DE-Lübeck
VERSATILE INNOVATIVE ADHESIVES FOR MEDICAL IMPLANTS
Francois Martin
Elkem Silicones; DE-Lübeck
The neuroengineering field is defined by the coupling of engineering and neuroscience; bringing together two different, but complimentary entities. Similarly, to create a successful neuroengineering device, it is necessary to couple the strengths of various, and sometimes distinctly different materials. Three hurdles that exist in selecting materials are creating a bond between substrates, developing a simple and feasible manufacturing process, and selecting materials that meet not only current regulatory guidelines, but follow regulatory trends for the future. New adhesive technologies are an option to help overcome these hurdles by widening the range of material options to pursue new therapies.

During the present lecture, we would like to draw attention to the technical challenges in covalent adhesion with substrates used for long term implantation applications and present Elkem Silicone’s expertise in the field of Silicone adhesives.

More precisely, we will explore the performance of novel adhesives designed to meet evolving regulatory requirements, optimize production processes, and overcome the barriers of material selection by bonding with a variety of substrates.

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// 09:50 – 10:15
MICROSTRUCTURED ADHESIVES FOR SKIN ADHESION: TECHNICAL REALIZATION AND IMPLEMENTATION OF A REGULATORY STRATEGY
Dr. Klaus Kruttwig
INM – Leibnitz Institute for New Materials; DE-Saarbrücken
MICROSTRUCTURED ADHESIVES FOR SKIN ADHESION: TECHNICAL REALIZATION AND IMPLEMENTATION OF A REGULATORY STRATEGY
Dr. Klaus Kruttwig
INM – Leibnitz Institute for New Materials; DE-Saarbrücken
Microstructured elements integrated into polymeric skin adhesives are a new and promising concept in the design of wound dressings and skin adhesion systems. Focusing especially on adhesive performance, theses bio-inspired dressings possess clear advantages, enabling novel design concepts. For a comprehensive overview, the main mechanical principles and design features will be discussed in detail. One of the envisioned applications is the treatment of tympanic membrane perforations. This medical affliction, affecting several million patients worldwide each year can result in hearing loss and represents a significant healthcare burden. The design and development of a polymeric wound dressing for the treatment of tympanic membrane perforations will be presented, focusing on pre-clinical analytical verification and validation studies in an animal model. Compliance with selected standards and medical device specific regulations is an elemental process already at early developmental stages. Therefore, the implementation and key elements of a regulatory strategy according to the MDD and MDR 2017/745 will be presented in the second part, focusing especially on the challenging, but exciting environment of research organizations during the development phase of prototypes.

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// 10:15 - 10:45 Refreshment Break
// 10:45 – 11:10
KRATON INNOVATION CONTRIBUTES TO SUSTAINABLE ADHESIVES
Rendert de Vos
Kraton Chemical; NL-Almere
KRATON INNOVATION CONTRIBUTES TO SUSTAINABLE ADHESIVES
Rendert de Vos
Kraton Chemical; NL-Almere
Sustainability has become a key driver for the adhesive industry. Once considered a “nice to have” feature, sustainability is increasingly valued by both adhesive producers, consumer goods manufacturers and end-users. Consumers are becoming more informed about where and how their products are made, and they increasingly include sustainability as part of their purchasing criteria. As adhesives are used in a range of everyday materials, consumer demand will continue to elevate the need for sustainable products. Companies that can meet these expectations will cement their leadership position within the industry as the supplier of choice. Globally, the need for a biobased economy is acknowledged and several certification schemes have been developed, allowing for independent assessment of claims on a product’s biobased content.

While using biobased material helps formulators achieve aspects of sustainability, raw material suppliers must deliver high performance with consistent quality, enhanced functionality, lighter color and stability – all of which are key to addressing market needs. With demonstrated performance benefits, opportunities exist for adhesive producers to leverage biobased materials to reach sustainability goals.

Biobased materials, such as rosin esters, deliver excellent adhesion to a large range of substrates due to their polarity and polymer compatibility. Low molecular weight and narrow molecular weight distribution – combined with a cycloaliphatic and aromatic structure – make biobased rosin esters among the most broadly compatible of all adhesive tackifiers. Rosin ester is a major component used in hot-melt adhesive formulations. Rosin esters with improved viscosity stability and color stability will enable formulators of ethylene vinyl acetate (EVA)-based hot-melt adhesives to deliver better thermal stability, allowing hassle free operation.

Kraton’s next generation of rosin esters offer excellent bonding strength, significantly lighter color and high stability, providing adhesive formulators with a new choice of high-performance biobased tackifier.

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// 11:10 – 11:35
WATERBORNE ACRYLIC DISPERSIONS SUITABLE AS CONTACT ADHESIVES FOR FOAM BONDING
Dr. Danny Antes
Synthomer; DE-Marl
WATERBORNE ACRYLIC DISPERSIONS SUITABLE AS CONTACT ADHESIVES FOR FOAM BONDING
Dr. Danny Antes
Synthomer; DE-Marl
Waterborne acrylics are widely used for PSA applications like tapes, labels and surface protection films, whereas contact adhesives for the foam and mattress industry are mainly based on chloroprene dispersions. Applied on substrates like foam or wood, contact adhesives based on chloroprene dispersions show unique behavior like instant tack, high green strength and creep resistance. As the market is looking more and more for ecologically friendly chlorine-free products Synthomer has developed an alternative solution which is based on waterborne acrylic technology, free of chloroprene.

In this paper, we will describe acrylic dispersions which are stabilized in a way that they can be used for 1K or 2K spray and roller applications, just like chloroprene based dispersions are used today. Furthermore, the newly developed dispersions can be mixed with chloroprene dispersions in any ratio as they are fully compatible with them. This allows the customer to formulate a product for their desired applications and needs. Our in-house developed test methods show very good initial tack on PU-foam and bonding strength even under restoring forces.

We see this technology as a very good step forward to substitute chloroprene dispersions as we can show that adhesive properties of our acrylic dispersions are just like chloroprene dispersions.

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// 11:35 – 12:00
Adhesion properties of single-component amorphous poly alpha-olefin pressure sensitive adhesives
Nick Fowler*, Kent Fischer, Andres Sustic
REXtac; US-Odessa, TX
Adhesion properties of single-component amorphous poly alpha-olefin pressure sensitive adhesives
Nick Fowler*, Kent Fischer, Andres Sustic
REXtac; US-Odessa, TX
REXtac has developed a new line of APAO polymers that provide unique PSA properties unlike any other polyolefin polymer. These new polymers can be used neat for many PSA applications or blended with other polyolefin polymers to improve adhesion and processing performance. By changing monomer concentrations of these new polymers, REXtac can vary the open time, product softness and softening point to meet specific application requirements. In addition, Rextac can increase cohesive strength using our proprietary external donor technology.

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// 12:00 – 12:25
INTRODUCTION OF “VYLON” CO-POLYESTER FOR APPLICATION IN ADHESIVES AND COATINGS
Yu Yamamoto and Takashi Okura
Toyobo Chemical Europe; DE-Düsseldorf
INTRODUCTION OF “VYLON” CO-POLYESTER FOR APPLICATION IN ADHESIVES AND COATINGS
Yu Yamamoto and Takashi Okura
Toyobo Chemical Europe; DE-Düsseldorf
Highly renowned for its excellent adhesion, durability and high degree of hygiene, it is used as a film adhesive or metal coating in a wide range of fields, including food packaging, electronic devices and automobiles.

Features:
  • Amorphous type of “VYLON” can be dissolved by Ethyl Acetate, methylethylketon, or other general purpose organic solvents.
  • Amorphous type of “VYLON” gives good adhesion to Polyester film or PVC film and Metal.
  • Amorphous type of “VYLON” itself gives good formability, and it is cross-linkable with melamine, isocyanate and epoxy, etc. when tough and durable coating layer is required.

The performances such as weather resistance, corrosion resistance, pigment disperse ability, formability and bending performance can be furnished by using highly advanced polymer designing technology.

Applications:
“VYLON” can be found in paint for coil coating, can coating, binder for magnetic paint, ink binder and as an adhesive for dry lamination. Additionally, it can also be used as an agent for film surface treatment, coating agent for receptor of recording media, adhesive for vibration damping steel, adhesive for printed circuit board and much more.
Recent trends from the market regarding sustainability and recyclability mainly in food packaging area, encouraged a new development of water-soluble resins.
First ideas and examples of application for such a new water-soluble resin class will be presented, mainly for heat seal lacquer, paper coating etc.

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// 12:30 - 14:00 Lunch
// 14:00 – 14:25
DAMAGE TOLERANCE BEHAVIOR OF STRUCTURAL ADHESIVES: INTRODUCING A NOVEL CONCEPT FOR ASSESSING BONDING SAFETY
Dr. Martin Brandtner-Hafner
FRACTURE ANALYTICS; AT-Mörbisch
DAMAGE TOLERANCE BEHAVIOR OF STRUCTURAL ADHESIVES: INTRODUCING A NOVEL CONCEPT FOR ASSESSING BONDING SAFETY
Dr. Martin Brandtner-Hafner
FRACTURE ANALYTICS; AT-Mörbisch
Today, structural adhesives are a key enabling technology for bonding various types of material ensuring their structural performance and safety. Specifically, in the automotive, construction and aerospace industry, traditional joining techniques such as screwing, riveting, welding and soldering are widely accepted and well-proven joining techniques. As a matter of fact, the selection of the optimal adhesive is crucial for the bonding success in operation in terms of safety, quality and performance. However, it is a very sophisticated and challenging issue for a decision-maker to finally choose the most suitable candidate relying on information mainly given by technical datasheets. Provided by adhesive-manufacturing companies, they are very limited in their explanatory power as they fail to provide significant safety benchmarks and comparative data. To overcome such limitations, an in-depth study was conducted with the aim to generate significant evaluation parameters for supporting the decision-making process effectively and efficiently. These parameters are based on fracture analysis and generated by an innovative test setup. A new safety factor was created and risk-adjusted price metrics were derived to assess potential candidates economically. The results lead to new and surprising findings, enriching conventional test- and analysis methods available on the market.

Keywords: damage tolerance, structural adhesives, safety factor, fail-safe behavior, decision-making support, adhesive selection, bonding safety.

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// 14:25 – 14:50
NOVEL APPLICATIONS OF IN-SITU CT MEASUREMENTS IN ADHESIVE TECHNOLOGY
Jens Philipp*, Elisabeth Stammen, Klaus Dilger
Technische Universität Braunschweig / Institute of Joining and Welding; DE-Braunschweig
NOVEL APPLICATIONS OF IN-SITU CT MEASUREMENTS IN ADHESIVE TECHNOLOGY
Jens Philipp*, Elisabeth Stammen, Klaus Dilger
Technische Universität Braunschweig / Institute of Joining and Welding; DE-Braunschweig
Within the scope of adhesive bonding, industrial computed tomography (CT) offers a high potential for different advanced applications. In a current research project approaching the implementation of a new technique based on in-situ X-ray CT combined with particle tracking for measuring the internal displacement field in adhesives [1], optimization measures of scanning parameters and measuring setups for in-situ computed tomography measurements on marker particle filled adhesives were carried out.

A key benefit of this optimization measures was a significant improvement in detail detectability and discriminability between used marker particles and surrounding adhesive compound utilizing the use of flat metal filters as well as a lead collimator. In this regard, air voids became detectable in good contrast to the surrounding adhesive compound even if the adhesive was modified by particles with a high X-ray absorption coefficient like tungsten. Performing in-situ CT measurements with the optimized parameter setups and investigating the particle behavior of specimens modified with glass beads as marker particles, delamination effects were observed under applied load. An achieved bonding enhancement by using a primer as pre-treatment for glass beads was also proven by means of in-situ CT. Furthermore, the parameter setups optimized for bulk specimen could be adapted on material combinations, e.g. single- lap shear specimen, by adjusting a few parameters.

Additional experiments demonstrate that CT measurements can also be used for analytical purposes, for instance to evaluate the mixing quality of so-called Quadro- or 2C mixers for two-component adhesives. In addition, specific characteristics in fracture behavior of adhesives were investigated via creating inhomogeneities within the adhesive.

[1] H. Kunz, E. Stammen and K. Dilger, J. Adhes., 93, 531 (2017).

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// 14:50 – 15:15
MOLECULAR PLASMA TECHNOLOGY: SOLVENT-FREE GRAFTING OF ORGANIC CHEMISTRY ON INERT AND SENSITIVE MATERIALS
Marc Jacobs
Molecular Plasma Group; LU-Luxembourg
MOLECULAR PLASMA TECHNOLOGY: SOLVENT-FREE GRAFTING OF ORGANIC CHEMISTRY ON INERT AND SENSITIVE MATERIALS
Marc Jacobs
Molecular Plasma Group; LU-Luxembourg
Our Molecular Plasma Technology enables single-step, solvent-free grafting of a wide range of organic molecules as well as bio-molecules onto ANY substrate using a very gentle, single step, atmospheric plasma process.

The novelty of our technology lies in the fact our system is gentle enough and provides the high degree of control required to be able to target and break the weakest bond ONLY of whichever chemistry we introduce into the plasma. This allows us to covalently bind the chosen chemistry/biomolecules onto any surface whilst preserving full chemical and/or bio-functionality. No other commercially available system is able to do this.

MolecularGRIPn" is a typical application for adhesion improvement on highly inert materials such as Teflon, polyolefins, PEEK, gold, titanium, etc. prior to bonding with a reactive adhesive system.

Please visit our website www.molecularplasmagroup.com and watch the technology videos to get more insight into the technology

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// 15:15 - 15:45 Refreshment Break
// 15:45 – 16:10
THIN GLASS COMPOSITE PANELS: INVESTIGATION OF THE ADHESIVE JOINT BETWEEN 3D-PRINTED POLYMER CORE AND GLASS
Dr. Christiane Kothe*, Anna Bodenko, Felix Nicklisch, Christian Louter
Technische Universität Dresden / Institute of Building Construction; DE-Dresden
THIN GLASS COMPOSITE PANELS: INVESTIGATION OF THE ADHESIVE JOINT BETWEEN 3D-PRINTED POLYMER CORE AND GLASS
Dr. Christiane Kothe*, Anna Bodenko, Felix Nicklisch, Christian Louter
Technische Universität Dresden / Institute of Building Construction; DE-Dresden
Thin glass is the most favoured substrate material for conventional displays and devices. But also, in architecture it will enables new applications in glass façades. Due to its high strength and small thickness (0.1 – 2 mm) thin glass is very flexible, lightweight and easily bendable. However, thin glass cannot simply replace conventional façade glazing. To avoid too high deformations of the glazing as a result of the high flexibility it has to be stiffened. An appropriate solution is the use of sandwich panels consisting of two thin glass panes with an inner polymer core. In order to maintain the lightweight of these façade elements, 3D-printed polymer structures should be used instead of a solid core. The present study is dedicated to finding a suitable adhesive to bond the polymer core to the thin glass. The mechanical and thermomechanical performances of different combinations of typical 3D-printed polymers and transparent adhesives were evaluated. In addition, the influences of temperature and UV aging were investigated as well as the compatibility of polymer and adhesive.

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// 16:10 – 16:35
CARRIERLESS REACTIVE PUR-HM TAPE FOR EDGEBANDING APPLICATIONS
Dr. Hartmut Henneken
Jowat; DE-Detmold
CARRIERLESS REACTIVE PUR-HM TAPE FOR EDGEBANDING APPLICATIONS
Dr. Hartmut Henneken
Jowat; DE-Detmold
Adhesives for edgebanding applications are one of the core competencies of Jowat who was always driving innovation in this field. For decades, edgebanding of wood-based panels with a variety of edgebands has been an established practice in the furniture industry. Modern, thermoplastic and moisture-curing reactive adhesives ensure superior bonding strength and high-quality appearance in edgebanding applications. A broad spectrum of adhesion to different edgeband materials is equally important as fast adhesive setting for direct downline processing and high heat resistance and durability. PUR hot melt adhesives are renowned for meeting the highest demands with regard to a zero-bondline appearance as well as resistance to heat, moisture and chemicals in kitchens and bathrooms.

Several years ago, Jowat patented a process for the underwater granulation of PUR hot melt adhesives. Nowadays Jowat supplies many hot melt adhesives of the latest generation also in granulate form. The ease of processing makes them particularly attractive for processers who have not used the PUR technology before.

This year another innovative technology is presented to the public in collaboration with Felder KG (Austrian edgebanding machine manufacturer). The (from applicator point of view) sometimes cumbersome use of a PUR-glue pot or melting unit in connection with high cleaning efforts can be omitted by using a novel carrierless reactive PUR-HM adhesive tape, which makes the processing easier and more effortless than ever before. Instead of the PUR adhesive in the glue pot of edge banding machines, a thin PUR adhesive strip is fused almost invisibly between the edge material and the workpiece. All advantages of the PUR adhesives can be used uncompromisingly while drawbacks such as complicated storage and processing, dirty and hardened glue pots and annoying cleaning belong to the past.

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// 16:35 – 17:00
DEBONDING OF ADHESIVE JOINTS - A REVIEW OF AVAILABLE TECHNOLOGIES IN THE PERSPECTIVE OF CIRCULAR ECONOMY
Univ.-Prof. Dr.-Ing. Paul Ludwig Geiß
University of Kaiserslautern / Workgroup Materials and Surface Technologies; DE-Kaiserslautern
DEBONDING OF ADHESIVE JOINTS - A REVIEW OF AVAILABLE TECHNOLOGIES IN THE PERSPECTIVE OF CIRCULAR ECONOMY
Univ.-Prof. Dr.-Ing. Paul Ludwig Geiß
University of Kaiserslautern / Workgroup Materials and Surface Technologies; DE-Kaiserslautern
Circular economy is a model of production and consumption in which existing materials and products are separated, reused, repaired, refurbished and recycled for as long as possible. In this way, the life cycle of the products is extended. In practice, this means that waste is reduced to a minimum. Once a product has reached the end of its life, resources and materials remain in the economy. They can be used productively again and again and continue to generate added value.
The recycling economy stands in contrast to the traditional, linear economic model ("throwaway economy"). This model relies on large quantities of cheap, easily accessible materials and energy.
The "separation" manufacturing process is gaining new significance with the aim of recovering raw materials. The debonding of adhesive joints is listed in DIN 8580 under Section 3.5.8. However, the aforementioned objectives of the circular-flow economy are not addressed satisfactory.
The aim of the paper is to provide an overview of available technologies for separating and recovering parts and adhesives from bonded joints.

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// 18:30 Networking Dinner
Wednesday, February 19, 2020
// 08:00
Registration Open
// 08:55
Welcome and Introduction
// 09:00 – 09:25
MIND THE WATER: UNDERSTANDING HOW WATER AND CALCIUM CARBONATE INTERACT IN ADHESIVES AND SEALANTS MANUFACTURING
Dr. Andrea Battisti
Omya International; CH-Oftringen
MIND THE WATER: UNDERSTANDING HOW WATER AND CALCIUM CARBONATE INTERACT IN ADHESIVES AND SEALANTS MANUFACTURING
Dr. Andrea Battisti
Omya International; CH-Oftringen
Calcium carbonate is the most widely used mineral filler in Adhesives and Sealants. Untreated products coarser than 5 µm (extenders) are valued for their optical properties and controlled particle size, as well as cost reduction purposes. However, treated products finer than 5 µm (functional fillers) have additional values, such as mechanical reinforcement and rheological modification. When formulating moisture curing systems, the amount of water carried by calcium carbonate must be known and controlled. Time-consuming and costly processing steps are common in manufacturing: filler drying, mixing under vacuum, heating/cooling, chemical drying.
This paper explains the fundamental interaction between calcium carbonate and water. Water pick-up is discussed using models from scientific literature, which are then applied to the behavior of calcium carbonate in humid conditions. Our discussion also covers surface treatments, the most common technology for hydrophobization. A final overview of the industrial relevance of the phenomena is supported by case studies.

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// 09:25 – 09:50
NOVEL ULTRA-FAST CURING AGENT FOR ADHESIVES APPLICATIONS
Leif Ickert*, Sabine Naumann, Pritesh Patel, Manos Roumpelakis, Liyin Zhou, Phoebe Xu, Cindy Wang, Christina Cron and
Evonik Resource Efficiency; DE-Marl
NOVEL ULTRA-FAST CURING AGENT FOR ADHESIVES APPLICATIONS
Leif Ickert*, Sabine Naumann, Pritesh Patel, Manos Roumpelakis, Liyin Zhou, Phoebe Xu, Cindy Wang, Christina Cron and
Evonik Resource Efficiency; DE-Marl
In response to market demand for increased productivity and environmental friendliness, Evonik designed a new ultra-fast 2K epoxy hardener for structural adhesives applications. This new curing agent - Ancamine® 2914UF - not only sets within 10 minutes at ambient temperature, but also offers ultra-fast cure speed along with rapid property development. Other key benefits of this product is that it is an odorless non-Mercaptan, 100% solids, BPA-, nonyl phenol- and benzyl alcohol-free curing agent. Additionally, it provides excellent mechanical properties and good thermal resistance. This makes Ancamine® 2914UF an ideal choice for structural and general-purpose adhesives, where it allows end users to improve production throughput.

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// 09:50 – 10:15
INTRODUCTION OF NEW CNSL DERIVATIVES FOR ADHESIVE APPLICATIONS
Tom Berckmans
Cardolite Specialty Chemicals Europe; BE-Gent
INTRODUCTION OF NEW CNSL DERIVATIVES FOR ADHESIVE APPLICATIONS
Tom Berckmans
Cardolite Specialty Chemicals Europe; BE-Gent
CNSL based chemistries have been widely utilized in epoxy resins and curing agents for their fast cure and excellent durability against adverse external conditions. More recently CNSL polyols and diols have gained increased attention and made contributions to the improvement of water resistance and durability of polyurethane systems. To support increased demand of bio-based chemistry beyond epoxy and polyurethane applications, Cardolite has designed materials with different functionalities including acrylate/methacrylate, silane, and waterborne curing agents. CNSL based methacrylates are tested for adhesives and 3D printing, their benefits are being discussed. CNSL silanes have been investigated to determine their utility as an adhesion promoter and modifier in epoxy formulations. The hydrophobicity of CNSL has been a unique and valuable property in coating and adhesive applications, however such feature has become a challenge when CNSL chemistry is incorporated in water. For the first time, Cardolite has started to offer CNSL waterborne curing agents. Their outstanding performance in adhesives will be discussed in the paper.

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// 10:15 - 10:45 Refreshment Break
// 10:45 – 11:10
LIQUID RUBBERS FOR ADHESIVES AND SEALANTS APPLICATIONS
Dr. Maria Martinez Velencoso*, Marcel Gruendken
Kuraray Europe; DE-Hattersheim am Main
LIQUID RUBBERS FOR ADHESIVES AND SEALANTS APPLICATIONS
Dr. Maria Martinez Velencoso*, Marcel Gruendken
Kuraray Europe; DE-Hattersheim am Main
Kuraray Liquid Rubber is a synthetic rubber based on isoprene, butadiene, and styrene at the polymer backbone and partially functionalized at the side chains to improve the adhesion to polar materials. They provide a safe method to join firmly metal surfaces while exhibit flexibility to withstand temperature changes or vibrations, for example, in automotive or construction applications. They show molecular weights ranging from 5,000 to 50,000 g/mol with narrow molecular weight distributions and can be cured with technical solid rubber by different systems, which brings unique properties to the formulations. For example, they can be used as reactive plasticizer that improves the processability and reduces the migration, keeping the mechanical properties, in comparison to the typical plasticizers.
In the automotive industry, the production of innovative solutions to reach the future mobility and transportation trends is continuously increasing: emissions & noise reduction, performance & safety improvement, light-weighting, interior air quality, and greater comfort. We will present some guidelines of how the Liquid Rubbers can help to reach some of the challenges of this market, as well as, the advantages & disadvantages of the crosslinking of rubber-based compositions by each system.

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// 11:10 – 11:35
INNOVATIVE SOLUTION TO BOND ON DEMAND - BORN2BONDTM STRUCTURAL (TWO-COMPONENT HYBRID CYANOACRYLATE)
Jean-François Chartrel
Bostik Smart Technology Centre; FR-Venette
INNOVATIVE SOLUTION TO BOND ON DEMAND - BORN2BONDTM STRUCTURAL (TWO-COMPONENT HYBRID CYANOACRYLATE)
Jean-François Chartrel
Bostik Smart Technology Centre; FR-Venette
In all sectors of production, productivity is more than ever a challenge beside quality. Assembly processes demand new solutions to accelerate the bonding speed, with the highest level of automation and guaranty of final performance.
Born2BondTM Structural instant technology is a high-strength, two-component hybrid cyanoacrylate with a bond-on-demand performance advantage. The hybrid technology provides a room temperature cure with a fast fixture time of ~30 seconds. The characteristics that sets this technology apart is a long open-time while maintaining good processability at up to a 5mm gap. Whether the materials are bonded 1, 5, 10 or 25 minutes after dispensing the adhesive, the cure will reach is full strength potential, with the same speed, offering unmatched process flexibility.
Born2Bond® Structural hybrid technology aims to provide structural performance with up to 18 MPa lap shear, temperature-aging resistance up to 120°C, gap filling, and long open time that no other cyanoacrylate technology can claim.
Dedicated for delicate microassembly and precise applications (Electronic, medical, luxury goods, etc.) Born2BondTM Structural is also found to be a good fit in Transportation and particularly Automotive, thanks to it hot strength with more than 5 MPa at 80°C. Some examples of automotive applications include Brackets bonding, sensor bonding (interior trim and tires), and plastics assembly as an alternative to Welding
Structural also offers friendlier labelling in some regions, over other technologies like Epoxies, Polyurethanes or MMA’s. Our Structural product is also sustainably produced from monomers and an Innovative process that reduces the carbon footprint. Our innovation also offers ease of recycling by thermal dismantling over 120°C.

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// 11:35 – 12:00
Bonding of critical substrates on assembly line and repair of car body structures with automotive approved innovative 2C solution concepts
Kai Paschkowski
Sika Automotive Hamburg GmbH
Bonding of critical substrates on assembly line and repair of car body structures with automotive approved innovative 2C solution concepts
Kai Paschkowski
Sika Automotive Hamburg GmbH
SikaForce®-820 PRODUCT DESCRIPTION
Weight-saving activities in the automotive industry are still ongoing. Another trend is the use of more complex shapes at the car body. Designers want more freedom to fascinate customers. To combine light weighting and design freedom, automotive OEM and OES customers are replacing more and more steel and glass by plastic materials. To assembly exterior parts as roofs, tailgates, spoilers and fenders, Trim Shop adhesives are in use to combine thermoplastics and composites. One of the most important substrate to replace glass are PC (polycarbonate) and PC-blends. A good example is the bonding of roof modules. For the roof bonding application different adhesive systems are in use. All of them show limitations. Critical aspects are the combination of plasticizers inside the adhesive and solvents inside the primer. A proven and reliable solution is to apply a double layer of primer. In this case the primer is working as a barrier for plasticizers. Target for Sika was to minimize the residual risk and to avoid any risk of environmental stress cracking and to offer a reliable and durable bonding of PC exterior parts. Working without primer is reducing the risk of stress cracking, but offers also a lean production process.
So, Sika established a new product which if especially developed for the bonding of PC and PC-blends. The new SikaForce®-820 merges the advantages of 1-K PU technology with the 2-K PU technology. With the development of the new and innovative SikaForce®-820 two main advantages could be offered:
  • High flexibility in complete service temperature range
  • Excellent adhesion to PC and PC-blends without primer
  • No risk of environmental stress cracking (no ingredients that could lead to stress cracking, no primer necessary to achieve good adhesion)

The availability of cartridges due to the comfortable 2:1 mixing ratio, allows easy prototyping.
Beside of modulus, the need to build up thick bondlines has to be mentioned. Creating a 2K PUR with excellent mixing behavior and good non-sag behavior is critical. Due to a special rheological adjustment, bondlines with a compressed thickness of approx. 5mm could be achieved.
SikaForce®-820 does not contain any stress critical ingredients. So, environmental stress cracking is history now with introduction of this new type of adhesive.
The easy application with static mixers, the missing pretreatment of PC and PC-blends, the possibility to apply thick bondlines and the compensation of thermal expansions make the SikaForce®-820 to a strong partner in bonding critical thermoplastic substrates.


SikaPower®-477 R PRODUCT DESCRIPTION
SikaPower®-477 R is a two component (2C) structural adhesive based on epoxy/amine technology with a new generation toughener to enhance crack sensitivity and therefore increase crash-resistance. The excellent adhesion properties allow professional bonding for a wide range of substrates like steel, aluminium and carbon-fibre reinforced plastic.

SikaPower®-477 R enables both a structural and crash-resistant repair of structural body parts made of steel or aluminium. Thanks to its high mechanical properties, the car is restored to its original conditions without any compromise on structural integrity. The innovative packaging concept of SikaPower®-477 R offers easy application with a standard 1C application gun at room temperature.
The initial curing of the adhesive takes place at room temperature and is completed during the thermal curing of the repair paint. A robust and easy curing can also be achieved with a local heating e.g. infrared lamps or heating blankets. Contact on both substrates provides a good corrosion protection, and further processing operations such as welding or riveting are facilitated due to a long open time of approx. 60 minutes. The curing time can be accelerated by heating the product after application; e.g. during the thermal curing of the repair paint.

The applied heat leads to higher mechanical properties of SikaPower®-477 R. The outstanding product performance, excellent application properties and various application possibilities make SikaPower®-477 R the first choice for car body repair.

TECHNOLOGICAL ADVANTAGES
  • Suitable for all structural repair applications
  • Excellent crash-resistance performance
  • Wide adhesion range (steel, aluminium, CFRP)
  • Class leading glass transition temperature
  • Increased stiffness
  • High young’s modulus
  • Inhibits corrosion
  • Free of solvent and PVC

APPLICATION BENEFITS
  • Adhesive can be applied with a standard 1C application gun
  • Glass beads (0.3 mm) ensure a defined bonding thickness
  • Easy and fast bonding surface preparation
  • Long open time enables easy welding and riveting afterwards


Abstract       Presentation
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// 12:00 - 13:30 Lunch
// 13:30 - 14:00
METAL BONDING @ AIRBUS AT A GLANCE
Werner Focke
Airbus Operations GmbH; DE-Bremen
METAL BONDING @ AIRBUS AT A GLANCE
Werner Focke
Airbus Operations GmbH; DE-Bremen
  • How it began – metal bonding on A300
  • Maturity of metal bonding
  • Metal bonding process chain
  • Metal bonding as corrosion prevention
  • Metal Bonding structure applications
  • Development activities


Presentation
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// 14:00 – 14:25
MODIFICATION OF SILICONE ADHESIVES USING ELECTRICALLY CONDUCTIVE FILLERS TO DISSIPATE ELECTRICAL OR ELECTROSTATIC CHARGES
Heinrich Leicht
SKZ- German Plastics Center; DE-Würzburg
MODIFICATION OF SILICONE ADHESIVES USING ELECTRICALLY CONDUCTIVE FILLERS TO DISSIPATE ELECTRICAL OR ELECTROSTATIC CHARGES
Heinrich Leicht
SKZ- German Plastics Center; DE-Würzburg
Electrostatic discharges (ESD) cause millions of dollars in damage to the economy every year. Today's commercially available systems for adhesive bonding and encapsulating components relevant to ESD and electromagnetic compatibility (EMC) are often based on epoxy resins, which especially provide a limited elasticity. The aim of the investigations is to show how existing application restrictions can be effectively eliminated by the development of new adhesives while at the same time reducing follow-up costs caused by ESD.
In line with this topic, the targeted modification of polyurethane- and silicone-based adhesives as well as casting compounds by the use of carbon nanotubes (CNTs) is being investigated within the scope of the project "ESDBond" (IGF-No. 20459 BG) funded by the Federal Ministry of Economics and Energy (BMWi). The results of relevant property changes of these modifications and the suitability of different silicone-based adhesive formulations for use as ESD/EMC adhesives and encapsulants will be presented. Electrically conductive networks can be formed within the otherwise electrically insulating polymers by integrating CNTs with a content of << 0.5 wt.%. This enables corresponding discharge capabilities in combination with minimal influences on the remaining property profile. In this scope, the results of relevant property changes of these modifications are presented in dependence on the fillers applied as well as filling degrees, dispersion methods and suitability of different adhesive formulations.

Abstract       Presentation
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// 14:25 – 14:50
ADHESIVES CONTAINING MIRALON™ PULP: UNIQUE ROUTE TOWARDS CONDUCTIVE STRUCTURAL ADHESIVES
Dr. Florian Klunker
Huntsman Advanced Materials; CH-Basel
ADHESIVES CONTAINING MIRALON™ PULP: UNIQUE ROUTE TOWARDS CONDUCTIVE STRUCTURAL ADHESIVES
Dr. Florian Klunker
Huntsman Advanced Materials; CH-Basel
Increasing electrification of the industrial world requires part designers to pay attention to electrical constraints. Examples of such constraints are the incorporation of mechanisms for avoiding electrostatic discharge or for providing electromagnetic shielding.
A common way to provide that functionality is to use electrically conductive adhesives during the assembly of parts. The mechanical loads on such assemblies are getting more and more demanding, requiring structural adhesives. The use of high amounts of conductive fillers in thermoset materials is compromising thermomechanical properties which limits the range of applications.
MIRALON® pulp is a new class of advanced carbon based performance materials. It is demonstrating high electrical performance and maintaining the thermomechanical properties of the base matrix. In this presentation, we present the first results of such an adhesive.
MIRALON® is a registered trademark of Huntsman Corporation or an affiliate thereof in one or more, but not all, countries.

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// 14:50 - 15:20 Refreshment Break
// 15:20 – 15:45
DAMPING MATERIALS BASED ON LIQUID POLY(BUTADIENE)S: STRUCTURE-PROPERTY RELATIONSHIPS
Olivier Defrain*, Steve Henning and Olivier Klein
Total Cray Valley; FR-Saint-Avold
DAMPING MATERIALS BASED ON LIQUID POLY(BUTADIENE)S: STRUCTURE-PROPERTY RELATIONSHIPS
Olivier Defrain*, Steve Henning and Olivier Klein
Total Cray Valley; FR-Saint-Avold
Damping materials are used to reduce or eliminate vibrations and noises mainly in industrial, transportation, electronic and structural applications. Several noise and vibration sources exist, such as ambient noise, mechanical vibration and structure-borne vibration. Nowadays, Automotive industry has worked on a multiplicity of acoustic systems, located in several areas of cars, to control ambient noise and vibration in passenger cars. Indeed, driving comfort is considered as a key criteria in the manufacturer’s development and consumer decisions in the purchase of new vehicles.

Some sound-deadening components, such as compositions based on liquid diene resins, are applied inside car cabins to mitigate noise and vibration. Indeed, liquid butadiene homopolymers-based formulations can be applied at low temperature (between room temperature and 60°C) and possess unique properties. When cured, they provide excellent damping performance and are characterized by low VOC emission.

By improving the damping performance of materials based on liquid poly(butadienes), the amount applied inside vehicles could be reduced, in turn decreasing vehicle weight. It is well known that crosslinking density influences the energy dissipation of rubber-based formulation. But it could be assumed that the main characteristics of liquid butadiene homopolymers influence the damping performances of compositions containing them. Some fundamental works have been performed to determine some potential structure-property relationships and identify some technical solutions in order to optimize the characteristics of rubber-based sound dampening materials.

Presentation
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// 15:45 – 16:10
THERMAL CONDUCTIVE TAPES - TECHNOLOGY, FUNCTION AND APPLICATIONS
Dr. Jochen Britz*, Dr. Patrik Kopf
Lohmann; DE-Neuwied
THERMAL CONDUCTIVE TAPES - TECHNOLOGY, FUNCTION AND APPLICATIONS
Dr. Jochen Britz*, Dr. Patrik Kopf
Lohmann; DE-Neuwied
The number of electronical components, especially in automotive vehicles, grew over the past years and is expected to grow further in the future. The functionality and reliability of these components play an important role. Root cause of > 50% of the malfunctions of electronical components is considered to be thermal overstress.
Therefore, the demand for sophisticated thermal management in electronic components is rising. To define and engineer an effective „heat dissipation path“ is a major task in thermal management of electronic components.
Heat transfer in general can occur by three different mechanisms: Thermal conduction, thermal convection and thermal radiation. Thermal conduction describes the heat transfer by mechanical linkage, thermal convection describes transfer of thermal energy by liquids, gas, fluids and thermal radiation describes heat transfer by electromagnetic radiation.
For the conjunction between heat source (for example IC or LED or PCB) and heat sink (for example aluminum body) there are used Thermal Interface Materials (TIM) like pastes, adhesives, adhesive tapes or gap pads. Their task is improving the heat transfer between heat source and heat sink by thermal conduction.
Thermal conductive tapes are used for combining bonding performance with thermal conjunction. Softness and conformability of pressure sensitive adhesive layers are very suitable for this task.
Adhesive tapes provide additional advantages like
  • Form stability
  • Preparation as 3D part (die-cut)
  • Easy applicability compared to liquids
  • Quick processability
  • Ready for automatized production processes

But thermal conductivity of polymer materials is low. Therefore, a combination of thermal conductive materials and adhesive polymers is necessary. The challenge is to keep the bonding performance of the tape.
The talk will present the technology of thermal conductive adhesive tapes, their characterization and their function in several manual and automated applications.

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