Bayhydrol® UH 2558 is a cosolvent-free aliphatic, anionic polyurethane dispersion used as a binder in the formulation of water-reducible coatings and sealers. This product has a non-volatile content (1g / 1h / 125°C) of 35-39, an Efflux time at 23°C, (4mmcup) of max. 40, and a pH (1:3 in demineralised water) value of 7-9.
The product is characterized by high resistance to yellowing, very good wet film transparency and very good abrasion resistance (taber), where the films are hard but flexible. Post-curing of such coatings with Bayhydur®, for example, brings additional significant advantages and results in waterborne two-component coatings with significantly higher mechanical and chemical resistance. The mixing ratio of mill base to hardener is generally 10:1. Compatibility with affordable PAC dispersions is good but must be tested on a case-by-case basis.
Covestro (formerly Bayer MaterialScience) provides raw materials, such as waterborne adhesives, major high solids coatings, advanced powder coatings, and specialty sealant chemistries. Bayer produces polycarbonates and polycarbonate blends, polyurethanes, and TPU resins, particularly for design and processing parts with TPU resins applications; helping products in a wide variety of applications look better and last longer.
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