Session 16: Waterborne Systems II
Chair: Andrew Trapani, Rohm and Haas, FRDue to the persistent interest in waterborne systems, a second session is dedicated to this innovative coatings technology. In addition to reduced VOC emissions, the benefits of waterborne coatings are reduced risk of fire, less hazardous residues etc. Here a novel polymer composition for waterborne primers with anti-knot bleeding properties, waterborne epoxies for low emission industrial flooring and cross-linkable water soluble polymers for radiation and thermal curing coating systems are introduced.
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Tuesday Afternoon 14.00 – 17.30 h
Room St. Petersburg
16.1 14.00 – 14.30 h The development of a novel polymer composition for use in waterborne primers with excellent anti-knot bleeding properties Dr. Jurgen Scheerder, DSM NeoResins, NL When the waterborne primers of today are applied on wood in most cases discoloration of the topcoat occurs. This is caused by organic wood components that are extracted when these primers are applied. These components then migrate to the coating surface and give discoloration. This is particularly pronounced on the knots where the concentration of resins and tannin are high. In this contribution we describe the development of a waterborne wood primer that exhibits excellent anti-knot bleeding properties. In our approach, we have eliminated several of the drawbacks of the current state-of-the-art polymers and primers. We will discuss the role of the polymerisation process and the polymer composition on the knot bleeding properties and we will show that these two act synergistically. Aqueous wood primers have been developed that exhibit a significant step-change in anti knot bleeding performance  | ||
| 16.2 14.30 – 15.00 h Penetration of nanolatexes into wood and porous substrates Dr. Antonio Mader, Vinavil, IT In recent years a number of investigations have been carried out regarding the penetration into wood of solvent and water based products. At the same time new technologies were developed for the manufacturing of nanolatexes with very fine particles. Since the penetration into wood is a key issue for the development of high performance protection systems, we have studied the subject considering the use of nanolatexes. We have taken into account different stabilizing mechanisms for the nanoparticles, and how they influence the penetration into wood, in addition to the previously investigated factors. Results regarding porous substrates will also be presented. Tentatively we correlate the penetration to both the rheology and the interaction between the particles and the substrates. | ||
| 16.3 15.00 – 15.30 h Novel, cross-linkable water soluble polymers and their application in radiation and thermal curing coating systems Dr. David Hood, ISP, US Insight to novel cross-linkable, water soluble polymers will be presented. In detail, functional derivatives of poly(vinyl pyrrolidone-co-vinyl acetate) will be discussed along with general structure and properties of these novel materials. Prototype formulations demonstrating the cross-linking functionality of these polymeric materials via free-radical, UV cure or thermally cure will be revealed. Application of these materials to inkjet receptive coating technology will be the focus of this paper. 15.30 – 16.00 h Networking: Refreshments & Coffee Break | ||
| 16.4 16.00 – 16.30 h Designed diffusion: A paradigm shift in film formation Dr. Zhenwen Fu, Rohm and Haas, US In latex based coatings, volatile organic compounds (VOC) are used as coalescents to ensure film formation. It has become increasingly difficult to maintain hardness, block, print and dirt pick-up resistance in industrial coatings as formulators reduce VOCs to meet demanding environmental regulations. Traditional methods of Tg reduction ? latex morphology control and hard-soft blends ? have been unable to meet the needs of the industrial coatings formulator... In this talk, a new technology is presented that significantly improves the early property development of waterborne latex coatings while addressing the challenges of the low VOC formulation landscape. This new Designed Diffusion technology balances coatings properties through careful design of the polymer system and the selection of a coalescent package with unique partition coefficient and diffusion rate between different phases of the polymer system. This paper presents detailed evidence of this DESIGNED DIFFUSION technology with analytical, physical and application data. | ||
| 16.5 16.30 – 17.00 h Waterborne epoxies: a practical, economic solution to low emission industrial floorings Rob Rasing, Airproducts Chemicals Europe, NL Current VOC legislation and material hazard classification are the tangible results of ongoing efforts to establishing a safe environment for professional applicators working with reactive systems. Increased environmental awareness in society and industry has turned the spotlight on ?green? technologies that meet the safety requirements both during the construction stage and during the lifetime of the building in service. Emerging EU regulations for the protection of inhabitants against hazardous emissions from building materials, targets the enforcement of high indoor air quality. Waterborne epoxies have long been recognised as the technology of choice for high performance flooring systems offering features including low odour, VOC compliance, easy handling and clean up. In addition this paper will present recent advancements of waterborne epoxies that demonstrate the ability to formulate high performance systems which are compliant to anticipated emission and out-gassing limits. Further, this paper will present the performance advantages of the latest waterborne epoxy curing agents offering high mechanical and chemical protection for concrete. | ||
| 16.6 17.00 – 17.30 h Insights into the effectiveness of Seratch resistant Coatings Dr. Rolf Nothelfer-Richter, Research Institut for Pigments and Coatings (FPL), DE Scratch resistant coatings belong presently to the state of the art for painting of cars, wood products and other metallic and plastic substrates [1-3]. The principle of the scratch resistance and the optimal analytical approach to test it are however still not fully known. Especially the role of nanoparticles is discussed controversial in literature [4-8]. These open questions dominated the aims of a government supported project on scratch resistant coatings. | ||
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