Bayhydrol UV-radiation cured polyurethane dispersions

Covestro Bayhydrol UV VP LS 2317 urethane acrylate dispersion

type	Urethane Acrylate Dispersion
form of supply	About 37% dispersion in water
use	Bayhydrol UV VP LS 2317 is used in the formulation of physically drying waterborne UV-curable coatings. Good re-emulsification properties and high wet film transparency

Product Specifications*

characteristic	Numerical value	Units of measurement	method
Non-volatile content (1g/1h/125℃/convection oven)	about 37	%	DIN EN ISO 3251
Outflow time@23℃(4mm cup)	<80	s	Bayer analysis method no.2008/105 03 03-98D
pH	about 7.5		DIN 53785

*This data is temporary data. The product specifications that should be followed are subject to the final published information.

Other data**

characteristic	Numerical value	Units of measurement	method
Exterior	slightly gelatinous
Density@20℃	about 1.06	g/cm3	DIN EN ISO 2811

**The above values are general information.

Solubility / dilution
Bayhydrol® UV VP LS 2317 can be diluted with water.

compatibility
This product can only be used in formula systems with a pH value above 6.7. Triethylamine is recommended for pH adjustment. Bayhydrol UV VP LS 2317 has good compatibility with many dispersions, including UV cured products. Compatibility needs to be re-tested after adjusting pH > 6.7. This product has limited compatibility with allyl polyester emulsions. Adding a solvent as an additive does not cause adverse phenomena.

application
Bayhydrol® UV VP LS 2317 is used for the preparation of waterborne UV-curing coatings, especially for use on wood. Typically, it can be sanded after physical drying before UV curing. A good initial curing effect can be obtained by adding a photoinitiator with a content of 1-2.5%wt (calculated by solid content). Polyurethane thickeners can be added to adjust formulation viscosity. If a defoamer is to be added, it must be diluted with a solvent before use, especially in flow coating applications. Matting agents and additives can be directly put into the product and dispersed by a disperser. Ordinary matting agents can easily matt Bayhydrol UV VP LS 2317. Usually, water-based pigment pastes are used in colored systems. After the water has completely evaporated, the paint can be cured with a 80W/cm lamp at a transmission speed of 10m/min. To cure colored systems, special photoinitiators and gallium lamps are required. To ensure the best curing results, it should be fully pre-dried and the paint film should not contain moisture. The physical drying and sandability of the paint film after water volatilization mainly depends on the formulation. However, it does not have chemical and mechanical resistance. UV curing does give the film good mechanical and chemical resistance properties. Another property of Bayhydrol UV VP LS 2317 is its good adhesion to many metal substrates. The addition of Bayhydur® products results in a waterborne dual-cure system.

store
Store at a temperature between 10-30°C, the product has a warranty period of at least 6 months. This product is sensitive to frost.

Safety: Hazard Identification
Harmful to aquatic life, may cause long-term damage to the aquatic environment.