Posters Group 1
All posters of this Group to be found at Carousel 1P 1.1
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Effect of Particle Size and its Distribution on Adhesion of Waterborne Coatings to Plastics
Haifeng (David) He, Jamil Baghdachi, Q. Xu; Eastern Michigan University
The adhesion of waterbone polymers and coatings to TPO and other thermoplastic plastics can be enhanced by the use of multi-lobe nano-sized latex particles as the principle resin. A series of low and high Tg latex nanoparticles ranging from 45-1250 nm were prepared and their direct adhesion to the substrates were evaluated using ASTM D4541test method. It was observed that in general, the force required to remove dried films from the plastic substrate increased linearly as the particle size decreased. Additionally, certain blends of small and large particles also showed stronger adhesion than mono-dispersed particles alone. The effect of particle size and their blends, and its contribution to adhesion, can be explained by a combination diffusion, particle packing and percolation theories.
P 1.2
Nanocomposite Coating for Evacuated Plastic Containers
Christian Breitwieser, Rembrandtin Lack GmbH Nfg. KG, Austria
Polymeric materials like PE, PP, etc. are permeable for gases (oxygen, nitrogen) and therefore not very well suited for long-time packaging purposes. Due to permeation of gases the content of a packaging may change unfavorably during storage and shelf-life will be severely limited. A coating-system suitable for application onto polymeric substrates will be presented. This coating is a very good barrier against permeating oxygen and nitrogen and is based on a UV-curable resin in combination with plate-shaped nano-particles. Different formulations and the results of measurements will be discussed. An application of this material on evacuated containers will be presented. It can be shown, that the inside vacuum remains stable for even one year compared to 4 weeks for the uncoated container. Insight will also be given into the application technology.
P 1.3
Light-Stabilized Coatings for Preservation of Wood-Plastic Composite Decking
Robert Waldron, Ciba Corporation
Wood-plastic composite (WPC) materials have found extensive use in the construction of residential decks. Although recognized as a low-maintenance product, WPC lumber is not immune to the effects of weathering. Sunlight and water exposure can lead to color change and physical degradation. Previous WPC preservation studies have evaluated the effectiveness of light stabilizers incorporated during the wood fiber/thermoplastic compounding process. This study presents the results of both accelerated and exterior exposure tests of WPC materials preserved by the application of a light-stabilized clear coat. Three coatings were tested, each based on acrylic emulsion polymers designed for low to zero VOC exterior formulations. Various light stabilizer options were evaluated in each coating type including (1) conventional UV absorber (UVA) and hindered amine (HALS) free-radical scavenger additives, and (2) a novel product range in which the UVA and HALS actives are incorporated into acrylic particles easily dispersible in waterborne coatings.
P 1.4
Utilization of Polyurethane-Acrylic Blends to Achieve Optimum Performance in a 1K Water-Based Wood Floor Coating That Meets Consumer and Environmental Expectations
C. Ivan Tyre, Alberdingk Boley, Inc.
With the advent of an environmentally conscious consumer and increased regulatory pressure, the coatings formulator is faced with developing products within the constraints of lower emission of volatile organic compounds while still achieving specific performance targets. Although new resins are being developed which will meet or exceed the expectations of the formulator, a blend approach using already familiar resins is still a viable option given known performance attributes of each. This paper will discuss the utilization of various water-based polyurethane-acrylic blends in developing a one-component wood floor coating which achieves a VOC target of 275 g/l, a balance of hardness development with very good abrasion resistance, and excellent chemical resistance in comparison with commercially formulated water- and oil-based products in the consumer and contractor applied markets.
P 1.5
New Waterborne Self-Crosslinking Acrylic for Industrial Wood Coatings Applications
Tina Dame, Lubrizol Performance Coatings
Within the industrial wood market, the requirements that formulators need to meet are significant; stackability, fast drying and resistant to blocking, solvent, chemical and light resistance. The coatings also have to maintain excellent appearance and be cost efficient. Resin suppliers are charged with the responsibility of developing products that will meet not only today's requirements, but also future requirements. A novel polymer has been developed to assist the coatings formulator in meeting many of the more stringent industrial wood coatings requirements. It will allow the formulator to create a product that has exceptional sandability, recoatability, and chemical resistance, along with excellent clarity and cost efficiency. This technology has also shown an ability to be blended with polyurethane dispersions to improve chemical resistance.
P 1.6
High Performance Water Repellent Acrylic Latices for Exterior Wood Coatings
Francois Simal, Hexion Specialty Chemicals, Belgium
The properties of acrylic latices can be significantly improved by the copolymerization of hydrophobic monomers. These modified acrylics can be designed to meet specific high performing criteria by varying the monomer composition or by using techniques such as cross-linking or core/shell. Acrylic coatings modified in this way have extremely high hydrophobicity and lower surface tension resulting in outstanding water resistance and water repellence. Substrates such as wood can be strongly affected by climatic variations resulting in many physical changes. High performance coatings are therefore required to cope with these high demands. Recent work on the modified acrylics has led to the development of self cross-linkable core/shell latices that have an extremely good hardness-flexibility balance together with excellent adhesion and durability. These emulsion polymers are particularly suitable for the formulating of high-performance wood coatings. Ongoing testing of exterior protective wood stains also shows very promising weathering resistance results.
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