Session 17: Polyurethane Technology
Chair: Dr. Christoph Irle, Bayer MaterialScience, DEPolyurethanes are one of the most versatile classes of organic coatings and usually represent the high-performance range of applications. Research continues unabated to further increase the performance, particularly in view of environmental legislation demands. Thus, this session focuses mainly on research aiming at high-performing 1K and 2K waterborne PUR coatings as well as radiation curing systems.
| << Previous Session | Next Session >> |
Tuesday Afternoon 14.00 – 17.30 h
Room Kiew
17.1 14.00 – 14.30 h Perfect layers: a novel class of waterborne 2 component polyurethane resins Tijs Nabuurs, DSM NeoResins, NL DSM launches a new waterborne two component resin portfolio at the European Coating Show 2009, updated to the requirements of the 21st century. Based on a novel polymerisation process a new class of resins has been developed, showing improved film properties. The new polymerization process leads to an enhanced incorporation of functional groups into the polymer backbone. These new resins exhibit blister free film thickness over 100µm dry in combination with high gloss. A differentiating feature of this class of binders is that they can be delivered free of organic solvents, resulting in an increased flexibility in formulation latitude. The paper will describe the relation between coating properties and polymer resin characteristics  | ||
| 17.2 14.30 – 15.00 h High performance waterborne 2K PU coatings for maintenance of steel buildings Dr. Thomas Stingl, Bayer MaterialScience, DE Since decades, one- and two component PU coatings have proven to be well suited for the protection of steel surfaces against corrosion. Properties such as weather resistance, water vapor diffusion and gloss can be easily adjusted. The use of waterborne polyurethane coatings has been very limited in this market segment, however. Based on new raw materials from Bayer MaterialScience, a new generation of maintenance coatings can be formulated. This paper describes new pathways for highly corrosion resistant primers, fastly curing topcoats and versatiile single layer formulations, all based on waterborne 2K PU technology. Coatings formulations based on these can be applied even under difficult climatic conditions, e. g. at low temperature, and still yield high performance protective coaings. | ||
| 17.3 15.00 – 15.30 h Nanoparticle-modified coating raw materials for high performance polyurethane coatings Dr. Arno Nennemann, Bayer MaterialScience, DE Nanotechnology is seen as one of the main future drivers for advanced coating materials. Nevertheless at the present stage many applications suffer from incompatibility between inorganic nanoparticles and the organic polymer matrix. We developed a new technology platform to modify different types of polyurethane coating raw materials with nanoparticles yielding stable products highly compatible in standard coating formulations. The properties of the resulting coatings could be improved in different aspects and applications. For instance high scratch, abrasion and solvent resistance in clear coat applications ? both in solvent borne and aqueous applications - as well as improved water resistance could be achieved. Even highly filled coating films showed excellent optical properties concerning gloss and haze and the polymer-intrinsic properties like appearance and elasticity were not compromised. 15.30 – 16.00 h Networking: Refreshments & Coffee Break | ||
| 17.4 16.00 – 16.30 h 2K waterborne polyurethane coatings for high performance industrial wood furniture application Felix Baah, BASF, NL As a result of stringent legislation restricting solvent emissions and heightened environmental awareness, waterborne coatings have made significant penetration in the coatings market. However, the market share of waterborne in the wood furniture market is still low. This may be attributed to unmet needs such as appearance ?Anfeuerung?, chemical and scratch resistance. Two-pack waterborne polyurethane is a viable option to achieve the requested high performance. In this paper, a system approach combines polyols with water-reducible polyisocyante hardeners containing free NCO group. Two-pack topcoats are coated on primer systems differing in their chemistries. Different approaches were used in designing the polyacrylate polyols. A surfactant free OH functional acrylate stabilized with low molecular weight acid functional resin will be compared to conventional surfactant based OH functional acrylic dispersions. The fast drying of these systems under mild drying conditions required for Industrial wood and furniture coatings applications will be emphasized. | ||
| 17.5 16.30 - 17.00 h Synthesis, curing kinetics, and properties of waterborne UV-curable polycarbonate based polyurethane coatings. Hyeon-Deuk Hwang, Seoul National University, KR UV-curable coatings have excellent properties including high hardness, gloss, mar and chemical resistance and are environmental friendly, containing no solvents. Otherwise solvents are added to lower viscosity for the spray applications, so waterborne UV-curable coatings have been studied as an alternative. Waterborne polycarbonate-based UV-curable polyurethane were synthesized from IPDI (isophorone diisocyanate), PCD (polycarbonate diol), and DMPA (dimethylol propanoic acid). 2-HEMA (2-hydroxyethylmethacrylate) and PENTA (pentaerythritol triacrylate) were used as an end capping agent for protecting the isocyanate groups and then the radical-type photoinitiator (Irgacure 500) was used at 3 wt%. UV-curing kinetics of waterborne UV-curable polyurethane was investigated by photo-DSC and viscoelastic property was analyzed using DMA (Dynamic Mechanical Analyzer) and thermal properties were measured using TGA (Thermogravimetric Analysis) and TMA (Thermomechanical Analysis). As increasing crosslinking density of cured polyurethane coatings, hardness and Tg were increased and thermal properties were improved. | ||
| 17.6 17.00 – 17.30 h Polyisocyanate in top-coatings soaking into base-coatings Yoshiyuki Asahina, Asahikasei Chemicals, JP We developed a new system using specific hexamethylene diisocyante (HDI) derivatives for top-coatings. It will enable to reinforce base-coatings without hardener by using specific HDI derivatives as hardener for top-coatings. At high baking temperatures, blocked polyisocyanates and melamines are used as a hardener of one component paint for reinforcing e.g. base-coatings. At low baking temperatures, these hardeners have no function, because they need high temperatures. At low baking temperatures, the new system only works for reinforcing base-coatings from top-coatings. We found out and proved that specific HDI derivatives of top-coatings soak into base-coatings at low temperatures. Then the soaked HDI derivatives react with the polyol in the base-coatings and these are getting reinforced. We will explain the characteristic of the specific HDI derivatives and the base-coatings after soaked the HDI derivatives from an analytical point of view using an inferred spectrum. | ||
| << Previous Session | Next Session >> |
