New development: Waterborne two-component polyurethane coatings – now for anti-corrosion applications also

Corrosion protection coatings based on waterborne two-component polyurethane technology are noted for their almost limitless flexibility in the choice of the binder components, formulations combined with the quality of the anti-corrosion properties (up to corrosion protection category C4 medium as per DIN EN 12944). In addition, these systems have excellent impact strength, which means they are suitable on difficult steel structures that are not torsionally rigid. These systems based on aqueous two-component polyurethane technology show strong advantages when it comes to productivity, especially through their ability to specifically influence the drying and curing properties. Rapid drying and recoatability are no problem.

A selection of possible binder combinations can be found in the following tables:

Dispersions:

	Type	Solids in %	% OH on solids	Viscosity mPas at 23°C	Properties	Application
						Topcoat	Primer
Bayhydrol® A 2227/1	Polyester- Polyacrylate dispersion	42	3.8	1500	For waterbased primers and topcoats with good resistance
Bayhydrol® A 145	Polyacrylate dispersion	45	3.3	950	Good pigment wetting, high shear stability, for high-gloss topcoats with good adhesion, solvent and water resistance
Bayhydrol® A 2470	Polyacrylate dispersion	45	3.9	2000	For clear and topcoats with good resistance
Bayhydrol® A XP 2770	Polyacrylate dispersion	45	3.9	2000	Low VOC version of Bayhydrol® A 2470 without ignition point
Bayhydrol® A 2601	Polyacrylate dispersion	45	3.9	2000	For clear and topcoats with good resistance, very fast drying without negative impact on application time
Bayhydrol® A 2695	Polyacrylate dispersion	42	5.0	2500	For clear and topcoats with very high resistance (Antigraffiti)
Bayhydrol® U XP 2750	Polyurethane dispersion	43	3.6	1000	For clear and topcoats with very high weather resistance

Polyisocyanate crosslinkers for waterbased dispersions:

	Type	Solids in %	% NCO on solids	Viscosity mPas at 23°C	Properties	Application
						Topcoat	Primer
Bayhydur® 3100	HDI poly-Isocyanate	100	17.4	2800	Hydrophilic hardener, also as additive for high-quality waterbased coatings
Bayhydur® 304	HDI poly-Isocyanate	100	17.4	2800	Hydrophilic hardener, also as additive for high-quality waterbased coatings
Bayhydur® XP 2655	HDI poly-Isocyanate	100	21.2	3500	Hardener for waterbased 2K-polyurethane systems with very easy incorporation into the formulation, also as additive for high-quality waterbased coatings
Bayhydur® XP 2487/1	HDI poly-Isocyanate	100	20.6	5400	Hardener for waterbased 2K-polyurethane systems with very easy incorporation into the formulation, also as additive for high-quality coatings with good chemical resistance
Bayhydur® XP 2759	IPDI- poly-Isocyanate	70	11.0	6500	Hydrophilic crosslinker in combination with HDI-grades, improved drying behavior
Desmodur® N 3600	HDI-Trimerisate	100	23.0	1200	For waterbased 2K and high solid coatings, high gloss, chemical & weather resistance, lightfast, good mechanical resistance
Desmodur® N 3900	HDI-Trimerisate	100	23.5	730	For waterbased 2K and high solid coatings, easy incorporation into formulation, high gloss, chemical & weather resistance, lightfast, good mechanical resistance
Desmodur® N 3800	HDI-Trimerisate	100	11.0	6000	In combination with Bayhydur®- und Desmodur® grades for the flexibilization of waterbased 2K polyurethane systems

Starting formulations for general corrosion protection:
Please note: These formulations have been developed for some popular applications. In order to be sure that they yield good results in your specific application and conditions also we recommend to contact our experts for advice. Additional formulations are available upon request.

RR 4433	waterborne 2K Polyurethane Primer (Bayhydrol® A 145 / N 3900)
RR 6058	Waterborne two-component polyurethane top coat (Bayhydrol® A 145/ Bayhydur® 3100/ Desmodur® N 3600)

The section "Industrial Coatings" also features some corrosion protection applications, especially for light corrosion protection

For more details on Bayhydrol® A XP 2695 have look at this presentation:
"Bayhydrol® A XP 2695 - Next step to high performance waterborne 2K PU primers and clearcoats"

Presentation: "A new Generation of Polyurethane Primers: 2-Component Waterborne"

Case Study: "Environmental Proctection with 2-Component Waterborne Polyurethane Coatings for construction cranes" (englisch)

Technical data and application information in these product overviews:

	Dispersions - Products and Applications
	Bayhydrol® A - designed for high Performance - engineered for Success
	The Toolbox for waterborne 2K Polyurethane coatings systems

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