New UV-Curable Polyurethane Dispersions for the trends in wood coaling applications: from high pigment load to outdoor applications

摘要

Since their introduction for wood and furniture finishing in the 1990s, UV-curing polyurethane coating systems have established themselves and steadily gained market share. The key rea-sons for this are their outstanding productivity, their great flexibility with respect to the choice of application methods, their high quality and, last but not least, the environment-friendliness of the raw materials and the process. The trends in wood and furniture finishing are toward Pigmented coatings, multicoats (primer + topcoat) and also weathering-stable, waterbome UV-coatings for exterior applications. A UV-polyurethane acrylate dispersion has been developed for pigmented systems that even at high pigment contents of up to 21% yields excellent chemical and stain resistance. Another new UV-curing polyurethane dispersion exhibits outstand-ing weather stability and thus enables the substantial lengthening of the renovation intervals that the wood industry has been demanding. A new type of emulsion, which in addition to outstanding grain accentuation and adhesion also exhibits very high chemical and mechanical resistance, can be used as both a primer and a topcoat. The development of these new and innovative product generations of waterbome, UV-curing polyurethane dispersions has enabled waterbome UV-technology to support new trends or even move into new fields of application, bringing the aforementioned advantages to a steadily increasing number of applications.