Hauthane L-3790
A water-borne, UV-curable, polycarbonate-based polyurethane dispersion.
SUGGESTED USES: Hauthane L-3790 is designed for UV-cured plastic topcoat applications
where exterior weathering durability, abrasion-resistant and chemical-
resistant films are required. Potential end-use applications include
automotive plastics, kitchen cabinets and wood flooring.
CHARACTERISTICS:
- Excellent chemical- and stain-resistance
- Superior humidity resistance
- Forms durable, films under ambient or force-dried conditions
- APEO-free
- Fast water-release properties
- Contains dipropylene glycol dimethylether (DMM) co-solvent
Physical Properties
| SOLIDS | 35± 1% |
|---|---|
| VISCOSITY | 50-500 cps |
| pH | 7.5-10.0 |
| DENSITY | 8.8 lbs/gal |
| SOFTENING POINT | Uncured: 290°F Cured: >500°F |
| VOC CONTENT | 75 g/l (as supplied) 192 g/l (less water) |
| SWARD HARDNESS | After UV-curing - 64 |
Application
L-3790 may be applied by spray or gravure methods. Films must be dried completely before UV energy cure. UV irradiation is required to attain optimal film properties, but un-cured coating films are durable enough for handling prior to curing.
Curing
L-3790 must be air-dried, or oven dried (temperature: 150 – 170° F; dwell time: 10 minutes) to remove water from the film prior to UV exposure. A photo-initiator must be incorporated into the coating formulation for effective curing. See starting point formulations for suggestions. Exposure guidelines: MPMA lamp – 300 watts/in 2 , 2.0 – 3.0 second dwell time.
