Session12: Novel Materials
Chair: Dr. Janos Hajas, BYK Chemie, DERaw materials suppliers and research institutes are in constant search for innovative products and technologies that offer new opportunities for the design and improvement of coatings systems. This session gives an overview of new materials like coalescing agents for low VOC paints, iron based paint and ink driers, polymeric dispersing agents for inorganic pigments or easy-to-disperse pigment preparations in granule form for waterborne coating applications, offering a nice cross section of new developments.
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Tuesday Morning 9.00 – 12.30 h
Room Kopenhagen
12.1 9.00 – 9.30 h A family of new coalescing agent for the development of low VOC paints Jose Ruiz, Rhodia, US Paint formulations usually require the use of coalescing agents to get appropriate film formation. Ideally, coalescing agents allow to quickly result in a tack-free film as well as obtain the appropriate hardness & gloss development in the final film. This new family of coalescing agents guarantee to combine the level of technical performance, that in most cases matches or in some cases exceeds that of industrial standards, with an unusually high boiling point. This allows the ability to formulate paint at much lower VOC levels, as defined by US regulation and to anticipate any potential increase of the VOC threshold currently fixed at 250 °C by the EC, without any compromise of the final paint quality. Details about general properties of these new class of coalescing agents as well as emonstration of the use of these in paint formulations will be discussed.  | ||
| 12.2 9.30 – 10.00 h Novel iron based paint and ink driers Dr. Ronald Hage, OMG, GB Cobalt carboxylates are the main driers for alkyd resins in paints and inks but concerns about their possible classification as carcinogens has generated considerable interest in alternatives to cobalt. Alternatives have been proposed but none have been found to have the all round performance of cobalt carboxylates. Iron based catalysts have been developed for the bleaching of tomato oil stains by oxidation through a radical mechanism [1]. This mechanism is analogous to the cobalt catalysed crosslinking of alkyd resins and it will be shown that these compounds can be used to replace conventional cobalt driers in solvent and waterborne alkyd paints. Results will be presented in a range of systems showing that comparable or superior drying times and film properties such as gloss and haze can be achieved using very low catalyst levels without the problems with film discoloration typically seen in other non-cobalt systems. [1] R.Hage, A. Lienke; Applications of transition-metal catalysts for bleaching textile and wood-pulp. Angew Chem, 45, 206 (2006). | ||
| 12.3 10.00 – 10.30 h Light stabilization toolbox - tuneable protection from UV to near visible Dr. Braig Adalbert, Ciba, CH Protection of coatings is often perceived a meanwhile mature and well established technology. This may be true for certain traditional applications, however, the increasing use of materials requiring coverage or enhanced protection at specific wavelength ranges along with novel resin technologies or low film builds have resulted in a variety of new light stabilizer developments allowing today tuneable protection from UV to the near visible. This light stabilizer toolbox, comprising solutions both for water based and solvent based technologies enables the paint companies to specifically adjust the level of protection needed in order to achieve ultimate performance in their specific applications. 10.30 – 11.00 h Networking: Refreshments & Coffee Break | ||
| 12.4 11.00 –11.30 h New polymeric dispersing agents for inorganic pigments Hendrik Ahrens, Clariant Produkte, DE A new class of polymeric dispersing agents is presented with pigment affinic groups for inorganic pigments and monomer units that contribute steric stabilization in aqueous dispersions. By choosing the right monomer ratios and molecular design of the polymer the dispersing characteristics were optimized. Electrostatic and steric stabilization was combined. The outcome is a group of anionic polymeric dispersing agents that offer high pigment loading, good dispersion stability and high coloristic properties. They are not only capable to disperse standard opaque pigments but also difficult to disperse nano-scale and transparent pigments. The polymeric dispersing agents are suitable for uses in pigment preparations, pigment slurries and waterborne coatings. | ||
| 12.5 11.30 – 12.00 h High Performace, VOC-free pigment grinding medium for water- and solventborne paints and coatings Bernhard Hirschmann, Cytec, USA Modern tinting systems for the production of high quality decorative and industrial paints and coatings require more and more advanced technologies and know how to meet current standards of stability and performance. The time has come to reconsider technologies of dispersants and wetting additives used for the grinding process of new pigments coming in various qualities. A brand new polymeric grinding medium was designed to be more than just a carrier for pigments into a colour system. This new product significalntly improves colour performance and pigment loading while being efficient for a very broad range of pigments. The new polymeric grinding medium contributes to film formation, hardness and chemical resistance and allows the formulation of very low and zero VOC pigment pastes. These pigment pastes will be compatible with a very wide range of bothwaterborne and solventborne decorative paints and industrial coatings. | ||
| 12.6 12.00 – 12.30 h Fit for the surface – Influence of the anchoring groups on the pigment stabilization properties Stefan Mößmer, BYK Chemie, DE In the following paper the influence of the polymeric architecture and the pigment adsorbing groups on the particle stabilization properties have been investigated. Therefore, structured copolymers have been synthesized by two different controlled polymerization technologies (CPT), which will lead to differences in the micro structure of the polymers. Beside the polymerization technology, the pigment affinic groups have been varied from aminic to salt like structures. The following matrix shows an overview on the synthesized structured copolymers: -Technology -Adsorbing Unit -CPT 1 -CPT 2 -Aminic -Polymer A -Polymer D -Salt 1 -Polymer B -Polymer E -Salt 2 -Polymer C -Polymer F To identify the influence of the molecular microstructure and the different pigment anchoring groups on the stabilization properties, pigment concentrates with different types of pigments have been prepared. After measuring the millbase viscosities, the pigment concentrates have been incorporated into different solvent-based let down systems (2 pack system, polyester/melamine and polyester/melamine/CAB), and gloss, haze and transparencies have been determined. Focus on: Polymer and Colloid Science (like controlled structure polymerisation, morphology, polymer absorption, grafting, encapsulation, mini-emulsion polymerisation) | ||
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