Session 10: Architectural Coatings I
Chair: David Sykes, Paint Research Association, GBFor architectural coatings specific regulatory VOC limits have been set in order to reduce emissions from these materials. The paint industry is currently adopting new technologies and reformulating its products to meet these tightening regulations. A lot of formulators are developing waterborne technologies for architectural coatings, as can be seen in this session. Several lectures are addressing environmental concerns, offering waterborne solutions for the formulation of architectural coatings.
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Tuesday Morning 9.00 – 12.30 h
Room Kiew
10.1 9.00 – 9.30 h Formulating architectural coatings to meet environmental concerns Michael Kaufman, Dow Chemical, US Today the coating formulator is faced with major reformulation challenges to create coatings that minimize the impact on the environment and yet also meet important performance requirements. Architectural coatings products are strongly affected by desires of home owners, painters, designers and architects to reduce the environmental impact of building materials which is leading to a wide variety of environmental initiatives. We will discuss some of the major formulating levers that the coatings formulator can pull to design coatings that meet the growing environmental concerns and provide performance. In the presentation we will discuss the impact of a variety of raw materials on VOC, odor and performance characteristics. To significantly aid the screening of raw materials, high throughput experimental methods were used to determine the best combinations of ingredients to yield excellent performance while meeting environmental impact initiatives.  | ||
| 10.2 9.30 – 10.00 h Advanced technologies for the formulation of higher performance waterborne masonry coatings with lower environmental impact Dr. Marie Noyale Bleuzen, Rohm and Haas, FR Pure waterborne acrylic technology is known to provide superior exterior durability to coatings for different substrates. Today's formulating tools can further improve this performance and also lower the environmental impact of the paint. Film integrity and adhesion to the substrate are essential for a protective coating. An optimum distribution of organic and mineral phases in the film can be obtained by encapsulating individual pigment particles with latex particles. This Pigment Encapsulation Technology (PET) allows the formation of polymer-pigment composite particles. Masonry paints based on PET binders exhibit strong adhesion to mineral substrates resulting in an improved efflorescence resistance. Replacing part of the TiO2 with an Opacifying Polymer (OP) improves the dirt pick up resistance. The homogeneous, spherical, hydrophobic OP resists dirt pick-up and helps reduce mold and algae growth. Additionally an optimized combination of a PET binder with an OP leads to paints with an even more favorable lifecycle analysis. | ||
| 10.3 10.00 – 10.30 h New developments in vinylacetate ethylene copolymers for use in architectural coatings Dr. Kerstin Gohr, Celanese Emulsions, DE Vinyl acetate/ethylene (VAE) copolymer emulsions have gained a significant share of the interior paint market in the last decade. One of the main drivers is the consumer trend toward environmentally-friendly, solvent free paints. VAE emulsions allow the paint chemist to achieve low temperature film formation resulting in a relatively hard film without the addition of solvents or coalescent, thus allowing the formulation of low to no VOC paints. Another advantage of VAE emulsions is their superior hiding power compared to other systems. This property, especially the importance of the binder compared to other components in a paint formulation, has been one focus of recent investigations. Traditionally, VAE emulsions could not be used in exterior paints and plasters because of a deficiency in hardness leading to high dirt pick-up. A new VAE-terpolymer will be presented that can compete with hard binders in exterior applications. In addition, these exterior paints can be formulated without coalescent, thus making them more environmentally-friendly. 10.30 – 11.00 h Networking: Refreshments & Coffee Break | ||
| 10.4 11.00 –11.30 h Next generation binders for waterborne paints with solvent based appearance: Improved body and gloss Ronald Tennebroek, DSM NeoResins+, NL For the perceived gloss of a dry paint film, two effects are to be considered. Firstly, the specular gloss, which could be very similar for waterborne and solvent based paints on a smooth substrate (e.g., a glass plate). Despite this similarity in specular gloss, when applied on a rough substrate (such as wood) the perceived gloss of a solvent based paint is usually much higher than that of a waterborne paint. Therefore secondly, one should also consider the ?body? of a paint. The ?body? is the ability to level out the telegraphing of the substrate surface roughness into the paint surface during drying, potentially resulting in high gloss dry paint layers. By using white light interferometry, the body of paints on standardized rough substrates could be measured and quantified. Recently, DSM successfully developed new environmentally friendly waterborne binders with an improved body, approaching that of a traditional solvent based paint, thus delivering high gloss waterborne paints when applied on rough substrates. | ||
| 10.5 11.30 - 12.00 h Solutions to formulating low VOC water based gloss trim paints using binders with structured particle morphology Joseph Brown, Dow Europe, CH Compliance with the increasingly stringent VOC regulations is a major challenge for the paint formulation chemists today and especially when it comes to gloss paints, where traditionally solvent borne alkyds are used. This paper describes water borne acrylic binder technology using the structured particle morphology in combination with an ambient cross linking mechanism, which enables the formulator to meet both the VOC regulations and the performance criteria needed for a gloss trim paint. This paper further discusses the impact of the polymer composition on the film formation and the block resistance. The paper also describes how the structured particle morphology and ambient cross-linking enables the formulation of a trim paint with an optimized balance of gloss, block, and adhesion without the necessity of incorporating co-solvents. This technology provides a solution to the coatings manufacturer challenge to achieve high performance environmentally friendly water borne gloss coatings, without compromising the performance and application properties typically linked to conventional solvent based alkyd coatings. | ||
| 10.6 12.00 – 12.30 h New developments on open time resins for waterborne decorative coatings Dr. Jaap Akkerman, Nuplex Resins BV, NL Limited open time of waterborne decorative coatings is still a critical issue and not up to the standard performance of solvent borne trim paints. As a consequence extensive R&D efforts are reported in recent years. New developments on the measurement of open time are presented. Further developments on critical paint components with regard to open time will be reported. The model of extended phase inversion by hybrid resin design is further elaborated and supported by new data. | ||
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