Technologien

UV-curing polyurethane dispersions


UV-curing polyurethane dispersionsWaterbased, UV-curable polyurethane dispersions are able to solve a number of problems at the same time: They are environmentally friendly as they use water as a solvent, they allow fast drying and they can easily be spray-applied. On top of that, they can more easily be matted compared to 100% solid UV-curing coatings. Waterbased UV-systems generally obtain a better adhesion to a wide range of substrates as well.

Due to their property profile these products are particularly suitable for substrates, that are not subjected to excessive heat during the application of the coating, like in plastics and wood coatings or resilient PVC floor coatings. Bayer MaterialScience offers UV-curing water-based polyurethane dispersions under the trade name Bayhydrol® UV.


A selection of products from the Bayhydrol® UV range


Solids content
%
Viscosity in sec
4mm Cup
Application
Bayhydrol® UV XP 2690
40 in water
< 80
outstanding weather resistance and flexibility, for applications like wood and plastcs substrates in outdoor applications
Bayhydrol® UV 2720/1 XP
40 in water
< 50
combines physical drying with highest crosslinking density - particularly for pigmented systems and thermoformable applications
Bayhydrol® UV 2689/1 XP
42 in water
< 50
low physical drying, highest crosslink density, especially for clearcoats (highgloss) or single layer metallic coats
Bayhydrol® UV XP 2775
40 in water
< 150
Excellent chemical and stain resistance
Bayhydrol® UV XP 2687
50 in water
ca. 250
For primers or clear coats in wood coating applications, good grain accentuation, very good resistance, good hardness
Bayhydrol® UV 2282
39 in water
< 50
Furniture, cork, parquet flooring, PVC, multi-purpose (multi-coat), good chemical resistance, good wettability, physical drying
Bayhydrol® UV 2317
37 in water
< 80
Clear and pigmented primers and topcoats; good wet film transparency, good wettabilility, physically drying
Bayhydrol® UV 2280
39 in water
< 90
Pigmented wood coatings, good chemical resistance, very fast physical drying
All products are neutralized with TEA

View all products of the Bayhydrol® UV product line.

Bayhydrol® UV XP 2775 - with excellent chemical resistance
This is an aliphatic UV-curing polyurethane dispersion that has initially been developed for white pigmented waterbased UV wood coatings. It shows an outstanding chemical resistance particularly against coloring substances like coffee. In contrast to regular UV dispersions, this product maintains its property profile even with a high white pigment load in UV systems. This high property profile allows much more freedom in the formulation and application of the coating. On top of that, Bayhydrol® XP 2775 shows good hardness and does not need any co-solvent to obtain a proper film formation. It shows its excellent mechanical and chemical properties not only in white pigmented systems but also in clear coats.
Other applications like PVC floor coatings can also benefit from the stain resistance of Bayhydrol® UV XP 2775. Due to its good physical drying it is well suited for a stamping process before UV-curing.

Have a look at this presentation on Bayhydrol UV XP 2775


Bayhydrol® UV XP 2690 - For exterior wood applications
Coatings based on this polyurethane dispersion are noted above all for their outstanding weather resistance, a claim that has been confirmed in a study by the Fraunhofer Institute for Wood Research (WKI), which shows that the wood surface remains absolutely free of damage during weather exposure and meets the requirements of DIN EN 927-3. The test results also show that when used outdoors, the timber can withstand the elements for eight years, before re-coating is required. An additional advantage is that Bayhydrol® UV XP 2690 is suitable for both clear coats and pigmented top coats.

Have a look at this presentation on Bayhydrol® UV XP 2690 for RadTech, October 2009: "Waterborne UV coatings for exterior wood application"

Also, our detailed technical paper published in ECJ 03/2010: "Longer lasting, not stressing the environment; Waterborne UV coatings for exterior wood application"

Bayhydrol® UV XP 2687 - For use as a primer.
The product is recognized for its outstanding grain accentuation and adhesion to all wood types, even those containing oil. The polyurethane emulsion has a high solids content, which allows higher film thicknesses to be achieved in a single application. Due to its excellent resistance properties and high degree of hardness, it is also suitable for clear coats and can be formulated for both spray and roller application.

Get more details in this presentation for the ECS 2009: "Bayhydrol UV XP 2687 - New high solids primer for wood, parquet and furniture"

More in-depth information in these presentations:



News:

BMS CAS receives the Ringier Technology Innovation Award 2011 for Coatings Industry

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Presentation:

UV Soft Touch for industrial plastic coating applications

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Presentation.

UV-curing industrial to on site RadTech2011

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Presentation:

A step beyond – Introducing a new waterborne cationic UV curing emulsion for use as
parquet and furniture primer RadTech 2011


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Presentation:

Coloured & Tinted Lacquers RadTech 2011


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Presentation:

Designing coatings based on physicochemical properties of UV-curing dispersions?
RadTech 2011

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Presentation:

Overcoming the Contradiction: Highly Filled White Pigmented UV Coatings with
Excellent Resistances



Technical data and application information in this product overview:
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2K WB Toolbox
MS00063580

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Technical Paper: UV Curing onsite applications

More on wood coatings and UV resins.

More on plastic coatings and specifically softtough coatings.


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