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At the European Coatings Show from 21-23 April, 2015 in Nuremberg, Germany, Bayer MaterialScience is presenting new polyaspartic raw materials for solvent-free coating formulations that can be applied with a roller. < According to Bayer, these coatings are so flexible that they can even bridge cracks that have formed in concrete. This property is particularly important for floor coating applications in the outdoor areas of buildings. "
In applications like this, cracks can form over time if the concrete dries out and shrinks, for instance, or if the ground moves,” said Karl H. Wührer, Head of Development for Structural Coatings at Bayer MaterialScience. Bayer says, without a protective coating, moisture can penetrate the concrete and cause frost damage. Balconies, roof gardens and loggias are also exposed to sunlight and weathering. What’s more, they are often subject to significant mechanical stresses. “For that reason, the supporting concrete substrate needs to have a lightfast, resistant coating that prevents moisture from entering the material,” explains Wührer.
To meet all these requirements, Bayer explains it has developed and submitted a patent application for a new hardener with very low viscosity. Among other things, this hardener can be used for the formulation of flexible, solvent-free floor coatings that are suitable for outdoor applications, comfort flooring and sports flooring.
Thanks to the rapid curing process, several layers of such polyaspartic coatings can be applied in a single day, using standard equipment. The coating is applied at room temperature, and the surface can be walked on again after just a few hours. Bayer says this minimises downtime on construction sites and saves money. As required for all systems for use in construction applications, these floor coatings also fulfil the existing Decopaint and VOC regulations. In addition, there are also national regulations; in Germany, these include the evaluation system for VOC emissions specified by the AgBB (Committee for Health-Related Evaluation of Building Products). Polyaspartic coatings have also proved their usefulness in protecting wind turbines, bridges, industrial plants and agricultural and construction machinery against corrosion, and as automotive repair coatings. They are also being used as floor coatings, although Bayer explains there is still some work to be done in terms of their application and cost-effectiveness. The new polyaspartic raw materials expand the range of available options and boast unique properties that offer many advantages over other systems.
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