Paint & Coatings Industry - May 2008 - (Page 49)

Technology for Industry FIGURE 1 | Silane monomer. Also, the inherent weatherability and moisture resistance of alkyl silanes make them suitable for use in water-repellent formulations that meet industry specifications and customer demands for greater protection of wood and masonry substrates, including concrete, sandstone, granite, limestone, marble, brick, tile, wood, gypsum and perlite. Silicone Antifoams Effective at low use levels, silicone antifoams are available in several forms for use in coatings formulations, including fluids, antifoam compounds (silica reacted with fluids), and emulsions of antifoam compounds. Variations of silicone antifoams include organic modification of silicone fluid, degree of crosslinking of the silicone fluid and others. By varying the type of silicone used, the degree of crosslinking, the type of silicone, etc., antifoams can be tailored to perform in many different types of coatings. Polydimethylsiloxane (PDMS) PDMS is a colorless silicon-based organic polymer used across many different industries, primarily for its hydrophobic properties (Figure 2). In coatings, it imparts wetting, leveling, foam control and gloss, as well as mar and slip resistance. It is colorless, nonreactive and may be emulsified. Depending on the degree of polymerization, PDMS can range from a volatile fluid to a gum-like substance. Silicone Resins Silicone resins can be cold-blended or reacted with many organic resins, or even used as the sole binder FIGURE 2 | Polydimethylsiloxane. Polyorganosiloxane Polyorganosiloxanes are unique polymers that are compatible with organic materials and provide many of the same functions as PDMS, while providing other benefits such as improved organic compatibility, deaeration and solvent resistance – without losing the properties associated with silicones (Figure 3). Polyorganosiloxanes are used in coatings to provide wetting, leveling, gloss, foam control, slip and mar resistance. They are also used as deaerators in microfoams. Polyorganosiloxane also allows for good recoatability. FIGURE 3 | Polyorganosiloxane Silicone Polyethers With polyether functionality attached to either end of the silicone backbone or alongside the pendant (Figure 4), silicone polyethers are used in coatings where formulators are looking for many of the benefits associated with silicon-based technology, including mar/ slip resistance, wetting, leveling and foam control. The polar functionality of the silicone polyether allows for good incorporation into a coating formulation. FIGURE 4 | Silicone polyethers. PA I N T & C O A T I N G S I N D U S T R Y 49

Table of Contents Feed for the Digital Edition of Paint & Coatings Industry - May 2008

Paint & Coatings Industry - May 2008 Contents Viewpoint Industry News Calendar of Events Company News Mergers and Acquisitions Names in the News Charlotte Dining Guide Exhibits-in-Print Waterborne Alkyds Break Through the Performance Barrier New Matting Agents for Waterborne Coatings and Varnishes Silicon-Based Technology for the Coatings Industry High-Performance Microgrinding The Development of New SMA Esters as Pigment Dispersants for Waterborne Coatings and Inks The Right Choice New Coating Technology Expands Color Choices for Vinyl Building Products BioPreferred Federal Biobased Products-Preferred Procurement Program European Union's REACH Regulation Sustainability - The New Nano Improved Dirt Pickup Resistance Critical to Future Coating Innovation NanoNews Protective Coatings NDT - Energy-Saving Paint Static Electricity - The Hidden Danger in Hazardous Areas Wacker Chemie - A Profile of Success Materials Watch Products and Literature Classifieds Advertiser Index

Paint & Coatings Industry - May 2008

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