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´s Coatings, Adhesives and Specialties business unit (BU CAS) manufactures an extensive range of raw materials and services for the Paints and Coatings Industry. The DESMODUR® and DESMOPHEN® lines specialize in coating application on wood, plastics, and vehicles. The IMPRANIL® line of Polyurethane dispersions is used for a wide variety of applications in textile coatings.
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