Wacker and Clariant have been announcing their new developments in coatings, paints and pigments, in preparation for launches and showcases at this year’s European Coatings Show (ECS). Here’s a preview of what the two companies have in store…
European Coatings Show 2017 will be held at the Nuremberg Exhibition Center, 4th to 6th April. This biennial event caters to manufacturers of paints and coatings, adhesives, sealants, printing inks and construction chemicals, suppliers of raw materials and industrial processors. Wacker and Clariant are just two of nearly 1000 exhibitors at ECS this year.
Paints and coatings
Clariant is giving centre stage to key priorities of paints and coatings producers and their markets. Highlights include the launch of an innovative sugar-based VOC-free (i.e. VOC content below the measurable threshold of 0.1% per ISO 11890-2) neutralizing agent, opening up processing and performance multifunctionality to eco-label certified paints. Clariant will also be presenting two new ranges of solvent-based pigment preparations: halogen-free pigments dispersed to “super-transparency” for use in the easy formulation of metallic effect shades or transparent coatings, plus a new range for easy coloration of UV-curing paint for industrial and wood coatings.
A selection of Clariant’s new ‘super-transparent’ pigment preparations colour range (image courtesy of Clariant)
These will be shown alongside Clariant’s ground-breaking new fire protection component that enables intumescent coatings to have a low and stable viscosity
even after long storage, and a synergistic combination of high performance UV absorber and HALS, xylene-free, that meets the most demanding requirements
for both solvent-based and water-based coatings.
Meanwhile, Wacker will present four specialty grades of HDK pyrogenic silica for advanced paint, coating and adhesive applications: hydrophobic HDK H30RM and HDK H30LM are suitable for rheology control in automotive clear coats; HDK H30RY can be chemically incorporated into resin networks and can improve mechanical properties of surface coatings and sealants; and HDK H20RH possesses excellent storage stability in basic systems and is ideal as a thickening agent in two-component adhesives and jointing compounds.
Wacker will also be showcasing the SILRES REN70-M for heat-resistant coatings. Combined with suitable pigments and fillers, the phenyl methyl silicone resin offers extreme thermal stability of up to 600°C in coatings that are stable at high temperatures, making the product especially suitable for formulating coatings for industrial plants, engine parts, stoves or incinerators. In addition, SILRES REN70-M is virtually free of aromatic solvents (<0.1%). The company will also present the new silicone intermediate SILRES IC 235 for weather-resistant coatings. This silicone resin contains absolutely no aromatics and is used in coatings for bridges, wind turbine stators and industrial plants.
Adhesives and sealants
Wacker will unveil two new silane-terminated polymers: GENIOSIL XM 20 (an alpha-silane-terminated polyether) and GENIOSIL XM 25 (a gamma-silane-terminated polyether). Like all silane-terminated polymers, GENIOSIL XM cures at room temperature via silane crosslinking. However, in contrast to the other polymers, GENIOSIL XM 20 and GENIOSIL XM 25 only have one silane group at one of their chain ends, meaning they are crosslinkable only at that end. The new polymers allow manufacturers to compound without the need for conventional plasticizers. In plasticizer-free adhesives, the new grades additionally enhance the bonding properties; in low-modulus sealants, they ensure high elastic recovery.
The two GENIOSIL XM grades not only adhere to concrete, wood, aluminum and glass, but also to low-energy surfaces such as polyvinyl chloride (PVC), polystyrene and cured ethylene propylene diene monomer (EPDM) rubber without pre-treatment of these substrates. Typical applications for GENIOSIL XM 20 include wood-flooring adhesives and all-round adhesive sealants. Applications for GENIOSIL XM 25 include sealants for expansion joints in buildings made of industrially prefabricated concrete parts and for connection joints between window frames and walls.
Wacker will showcase its new low-viscosity binder for high-end digital printing applications. VINNOL E 18/38 is a vinyl chloride-vinyl acetate-copolymer resin, developed specifically as a binder for solvent-based digital printing. The copolymer displays excellent dispersion properties, which enable even distribution of pigment particles. In very low-viscosity inks, it counteracts the tendency of the pigment particles to agglomerate and sediment. The vinyl chloride-vinyl acetate-copolymer resin ensures excellent droplet formation in solvent-based ink-jet inks. This increases the print quality of the end product and extends the longevity of the print-head. Furthermore, it adheres well to flexible PVC and many other substrates, making it ideally suited for wide-format printing of advertising banners, cables, screw caps and many other plastic items.
Wacker’s VINNOL E 18/38 ensures excellent droplet formation in ink-jet inks with high resolution and brilliant colours even at high print speed (image courtesy of Wacker Chemie AG)
The binder also complies with numerous provisions for food contact, for example regulations issued by the Food & Drug Administration in the US (FDA
21 C.F.R Sections 175.300 and 175.105). Consequently, VINNOL E 18/38 is a suitable binder for food packaging inks.
Wacker will showcase a new polymeric binder for two-component water-repellent construction applications. VINNAPAS 760 ED is a terpolymer based on vinyl acetate, ethylene and vinyl ester. A special feature of the dispersion is its vinyl neodecanoate component, which Wacker markets under the VERSA brand. Together with ethylene, this considerably increases the elasticity of the end product. As a result, the coating is extensible, flexible and highly resistant to hydrostatic pressure. In flexible sealing slurries, the hydrophobic VINNAPAS 760 ED dispersion ensures good tensile adhesion strength after prolonged exposure to water, and outstanding crack bridging, even at low temperatures. As a mortar additive, it ensures outstanding crack bridging, both for static and dynamic cracks – even at low temperatures down to -20°C. VINNAPAS760 ED has very little influence on cement setting behaviour and it is readily compatible with different types of commercially available cement. According to assessment by the German Federal Institute for Risk As-sessment (BfR), the material is suitable for contact with drinking water, because it does not require any additional solvents, plasticizers or film-forming aids.
For more information about the European Coatings Show visit https://www.european-coatings-show.com/. Wacker will be at Booth 1-510, Clariant at Booth 7-123.