24 September 2008
The Cedar Court Hotel, Bradford
Continuing West Riding's successful Forum format, 'Aspects of Rheology' will include a series of advanced presentations on innovations and developments in thickeners, rheology modifiers, instrumentation and the measurement of rheological properties of coatings.
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Previous Aspects Forums were very well attended with a high level of information given by selected experts from academia and industry.
'Aspects of Rheology' will deliver a more advanced treatment of a highly specialised subject and will offer a better understanding of a complex subject which should benefit formulators, production and marketing personnel in the coatings, printing and adhesives industries.
Wednesday 24 September 2008
Optimising Paints with Rheological Additives
Biography: Sales Manager CI UK & South Africa
Abstract:
Modern techniques in rheology, like oscillation and step-recovery measurements, are becoming standard tools for the paint formulator. In this presentation, the influences of various classes of rheological additive on the visco-elasticity of coatings are described. Practical systems and real case studies are used to show how these methods can be used to design paints and accurately predict their application properties.
Introducing some of the relationships between Rheology and Particle Characterisation
Biography: Andrew Walton is currently employed at Malvern Instruments as a Rheology Specialist and has spent 20 years supplying, developing and supporting rheological instruments. Significant experience has been gained in the development of rheological test methods for a broad range of applications including dispersions, polymers, and foods.
Garamite - A Silicate Thixotrope for Low VOC Applications
Biography: Klaus Dziwok is located at Rockwood Clay Additives GmbH in Moosburg, Germany. He studied chemistry at the Technical University of Munich. 1990 he joined Süd-Chemie AG, Moosburg/Germany doing R&D and TechService on bentonite clay based products, mainly for rheological applications. 2006 he changed with the rheological part of Süd-Chemie AG to Rockwood Clay Additives GmbH.
Abstract:
Garamite is a hydrophobic mixed mineral silicate used as a thixotropic additive in solvent-based applications.
Chemically, it is developed based on an organoclay background, but garamite shows definite advantages over organoclays and fumed silicas. One is the possibility of highly concentrated pregels, up to 20%, which are still pumpable or even self-flowing. In the final product application, it gives improved low shear viscosity and sag control without increasing the high shear viscosity as much as its countertypes. Therefore it is an ideal material for high-solid applications.
Applications: solvent-based epoxies, PU and alkyd-based systems, vinyl esters, UPR and 100% solids epoxies.
Rheology - The Key to Efficient, Effective Use of Effect Flake Pigments
Biography: Mr Peter Wissling has an engineer’s degree in Paint Chemistry. He started his working career in the anticorrosive pigment industry and then moved to an American acrylic binder producer.
Peter has been with Eckart for 13 years and. at present, is working in the Technical Service Department, Industrial Coatings. In this function, he services northern Europe, the Middle East, the Far East, and Australia. For these markets he provides technical solutions to customer problems, training for local organisations, and carries out market surveys.
Peter Wissling has published technical articles in coatings journals and, in recent years, a book on metallic-effect pigments.
Abstract: Flakey pigments have special optical attributes, when used correctly. Flip Flop is the one everyone has heard about, but many misunderstand.
Unfortunately, too often, the optical attributes achieved by the formulator and applicator are less than optimal.
Although metallic effect flake pigment selection is fundamental to achieving the best/desired effect economically, poor rheology can reduce the desired economy. If you spend a lot on an expensive specialised metallic effect flake pigment, you need to get the best from it. You may already be buying 'an expensive specialised metallic effect flake pigment', and using it poorly. Better understanding of rheology for metallic effect flake pigments, may allow you to achieve the same effect with a cheaper one.
With metallic effect flake pigments, poor rheology, poor effect and poor economy tend to go hand in hand.
Focusing on rheology for metallic effect flake pigments, the presentation will:
Rheology modifiers for coatings
Biography: Yohann Trang obtained a chemical engineering degree with a specialising in formulations for coatings inks, adhesives and cosmetics in 2002 at ITECH Lyon, France. He then began his career in the coatings industry with Cray Valley as a chemist in their additives lab. He was also involved in some production transfers and then took the responsibility for the central application lab for additives as Laboratory Manager. He has been working now for two years as Technical Manager for Crayvallac Additives in Europe, Middle East and Africa, also supporting occasionally other units in Asia Pacific.
Abstract: Cray Valley has a long experience in rheology and has built up a strong expertise in this field. Cray Valley is now a leading worldwide manufacturer of organic rheology additives, and is able to offer formulators a wide variety of rheology modifiers as an appropriate solution.
The use of rheology additives is necessary in most of the coatings systems. The choice of the most suitable rheology modifier or suitable chemistry will not only affect the rheological behaviour, but in some cases other properties such as production process, storage stability, application properties, gloss, film aspect, film thickness.
For this reason, it is of high importance to use the perfect product. Different parameters have to be taken into consideration such as processing equipment and production constraints, viscosity requirements, system nature in terms of binder and in terms of polarity (solvents), film thickness, substrate, curing conditions...
The talk will include