Polyurethane base coats – Excellent protection for many metal substrates
Metal-substrates can be protected from corrosion by a classic multi-layer coating (primer + topcoat) or by a single-layer coating system. During any multi-layer coatings application the first coating to be applied is a base coat which protects the substrate from any humidity or any oxidizing substances and ultimately from corrosion. Polyurethane base coats can be used on many different substrates even though they are mainly used for the coating of metal substrates, such as untreated, phosphatized or galvanized steel panels and aluminum or chromated aluminum. Single-layer coating systems can also provide a good corrosion protection, though.
For base coats mainly polyester- or polyacrylate based two-component polyurethane systems are used. They produce good adhesion and provide good corrosion protection.
Moreover it is important to use fast curing systems in order to obtain an efficient coating process. One-component or two-component formulations for low-temperature curing or stoving coatings are the systems of choice.
Depending on required processing needs and property profile waterborne binders and conventional binders, both in one- or two-component formulations can be used.
Selection of products for industrial primers
This is just a small selection of the large product range for primers in plastic applications. Since there are almost limitless industrial applications possible and many different substrates used and because of varying processing characteristics it is essential to discuss the selection of products for each individual application. Get into touch with your regional representative to discuss your individual requirements.
One-component polyurethane raw materials for waterborne primers
Waterborne one-component corrosion protection primer (Bayhydrol® UH XP 2592)
Two component polyurethane raw materials for waterborne primers
Primers based on waterborne two-component polyurethane technology offer great flexibility in terms of binder components and formulations and, as a result, in the quality of corrosion protection properties (up to corrosion protection class C4 medium in accordance with DIN EN ISO 12944). Consequently, these primers stand out in terms of impact strength, achieving above-average performance in stone impact tests and being successfully deployable on non-torsionally-rigid steel substrates. An additional advantage is their good compatability with the corresponding polyurethane topcoats.
Primers based on waterborne two-component polyurethane technology can score in terms of productivity too, especially as a result of their drying and through-hardening properties, which can be specifically fine-tuned. Rapidly drying ready-to-use primers can be easily formulated. In some applications waterbased, single-layer direct-to-metal coating systems have been introduced. They combine the function of a primer and a topcoat in one single coating layer.
A selection of possible binder combinations for waterbased 2K polyurethane primers
