Example 8
Coating solution E was applied to the substrate (72D Pebax rods) using a dip coat method. Specifically, the substrate was immersed in the base coat coating solution with a dwell time of 5 seconds. The substrate was then extracted from the solution at a speed of 0.3 cm/s. The first layer was then air dried for at least 10 minutes. The first layer was then UV cured. Specifically the coated substrate was rotated in front of a Dymax 2000-EC series UV flood lamp with a 400 Watt metal halide bulb for 3 minutes, approximately 20 cm from the light source.
Next, coating solution F was applied to the first layer, also by dip coating at the same speed to form the second layer. The second layer was then air dried and UV cured using the same conditions as for the first layer.
The friction of the coating was then tested according to the testing procedure outlined above. The results are shown in
