Paint & Coatings Industry - March 2009 - (Page 32) Environmentally Friendly CorrosionProtective Polyester Resins for owder coatings are increasingly preferred over conventional solventborne and waterborne coatings. These types of coatings offer a high environmental advantage and, in addition, they are key to the economic benefit in the coating process. One of the reasons is that powder coatings are 100% solid, solvent-free materials that process with close to 100% utility. Even more important is their high technical performance. P Powder Coatings of corrosion protection at the relevant atmospheric environment. Furthermore, the new norm, DIN 55633, describes the extension to powder coatings; otherwise it is strongly related to the DIN EN ISO 12944 standard. The atmospheric corrosive environments are classified in the DIN 12944 from very mild C1 to C4 high corrosive, with special classes for highly corrosive industrial C5I and maritime C5M environments. Figure 1 shows the minimum requirements for the two most important tests, natural salt spray and humidity, in relation to corCorrosion Protection rosion classes and expected lifetime. As the global market leader, DSM Powder Coating Resins In line with the above, DSM Powder Coating Resins specializes in the innovation, development and manufacdeveloped a new technology for corrosion protection with ture of polyester resins for powder coatings. Corrosiona strong focus on reducing the impact of the total coating protective powder coatings, based on environmentally process on the environment: Uralac® Corres. In a single coating layer system Uralac® Corres can protect direct-tofriendly polyester, are a new DSM development in line metal against corrosion up to corrosion class C4 medium. with the company strategy on sustainability. Coatings are For even tougher corrosive environments, C4 to C5, the primary solution to prevent corrosion of metal, and Uralac® Corres can be used as a primer in combination steel is the most commonly used metal. Depending on the with a topcoat. An important additional benenvironment where the product is in use, it efit for the use of Uralac® Corres-based needs protection from corrosion. primers is the reduced risk of delamUralac® Corres ination, due to good intercoat ACE Uralac® Corres is especially adhesion, good over bake resisdeveloped for corrosion protance and the significantly tection on steel and can be better UV resistance. used in many market segThis new technology Automotive Construction ments. The main target incorporates an enhanced segments range from thin, barrier against the key Uralac® flat steel applications like elements of the corroCorres metal furniture, shelvsion process, the transKey to ing, heating/ventilation port of water and oxygen Corrosion and domestic appliances through the coating. The Protection to equipment, automoincreased hydrophobicAppliances tive parts and even heavy ity of the binder and the Small parts steel applications like ACE strong interaction between HV/AC and construction beams. the binder and the pigCorrosion protection is ment/filler has a synergistic needed for every single applicaeffect. In addition, the barrier, Metal Furniture tion; depending on the expected in combination with the strong Shelving lifetime and conditions of use it has intimacy of the Uralac ® Corresbased powder coating with the metal its own specified requirements. substrate, inhibits the corrosion process. Industry Requirements There are many branch- or industry-specific requirements implemented in standard norms. Corrosion protection of steel structures by protective paint systems (DIN EN ISO 12944) for example prescribes the level Direct Comparison Study To support and prove the above claims, DSM ran a direct comparison with common powder coating systems. Uralac® P 7604 Corres was applied on R 46 Q-panels By Marcel Schutte, Eric Blokhuizen, Dana Ionescu and Paul Vercoulen | DSM Powder Coating Resins, The Netherlands 32 MARCH 2009 | W W W . P C I M A G . C O M http://WWW.PCIMAG.COM
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