Upgrade polyurethane: Isocyanate-free curing systems with highest resistance

 
For decades, the urethane group has formed the basis for high-quality two-component coatings, among other things. The development of this technology had a lasting impact on the coatings industry and enabled a significant increase in the quality of the corresponding coatings compared to the systems known at the time. A wide range of innovative developments based on this technology are still taking place today. Growing requirements, such as the increasing reduction in solvent content or the complete elimination of isocyanates as hardener components, make it necessary to significantly adapt the base binders and hardeners used. The moisture-curing, silane-functionalised polyurethane-urea binders represent a technology that can be used as the basis for high-quality coating systems in a wide range of applications. They combine the familiar urethane groups with urea groups and the siloxane formation of silanised products. The basis for this technology is formed by a variety of polyols from the polyester polyol, polycarbonate diol and polyether sectors, among others, which are customised to the system. In addition to hydrolysis and light resistance, the toughness, elasticity and hardness can also be varied. The technology cures isocyanate-free and enables the decoupling of processing time, VOC content and crosslinking speed. The products are characterised by very fast drying and cross-linking speeds, which enable early chemical and mechanical resilience. In corrosion protection systems, properties such as fast drying, high hardness, high elasticity and excellent corrosion protection resistance can be combined.