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This paper gives an update on the latest developments of the new generation of waterborne Polyurethane Topcoats (PU topcoats) for flooring which were presented during the annual SSPC meeting October 2003. Topcoats are commonly used in the construction industry over functional floor coatings or as sealers for concrete.
This paper gives an update on the latest developments of the new generation of waterborne Polyurethane Topcoats (PU topcoats) for flooring which were presented during the annual SSPC meeting October 2003. Topcoats are commonly used in the construction industry over functional floor coatings or as sealers for concrete. For many years solvent-borne polyurethane topcoats are the standard for flooring due to very good properties, mechanical and chemical, and application ease-of-use. However, the significant amounts of solvent act as volatile organic compounds (VOCs) and change in the VOC regulation make it more complicated to apply these topcoats. As shown in the previous presentation, high-solids, solvent-free or 1st generation waterborne topcoats lack in application characteristics or in performance, especially chemical resistance. Over the past 5 years, the 2nd generation of waterborne PU Topcoat resins were developed. The new coating raw materials —hydroxyfunctional polyols and isocyanates- have in common a very low cosolvent content, < 1% b.w., and the application ease-of-use. The different resins allow the formulator to make flat to glossy topcoats with a wide range of mechanical and chemical properties. This presentation is focused on the glossy high chemical resistant waterborne PU topcoats
Prompted by requests from Specifiers and Steel Shop Fabricators, a Non-Zinc coating has been developed that has attained a Class B Slip Coefficient rating and therefore can be applied to faying surfaces of slip-critical bolted connections. Results show that this product offers fast dry times and excellent corrosion resistance.
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The primary structure of many outdoor baseball parks and football stadiums is exposed structural steel. These facilities are often located in major cities in areas that may present challenges in control of corrosion. The challenge is also manifested in the fact that the structural steel frame becomes an architectural feature which must be maintained as an aesthetic element.
Advances in technology have brought forth a new generation of Concrete Grinding equipment and accessories to reduce the labor hours to level a slab, prepare the surface and to optimize the surface profile for the specific coatings popular today. Understanding and applying these technology advances can greatly impact the tool selection for the job at hand.