Figure 3. UVA-W is with polyurethane clear resin for waterborne
coating after 1,000 hours QUV-313nm exposure. Results show UVA-W was able to minimize discoloration to the coatings.
Figure 4. UR1 is with epoxy acrylate UV curable clear resin for metal
coating after 100 hours QUV-313nm exposure. Results show UR1 was
able to minimize discoloration to the coatings.
ings. Before and after exposure of delta E measurements (as
shown in Figure 3) and adding UVA-W, coatings would receive different degrees of the protection according to each
consumption level. Evidently, a higher use level provides a better protection.
4. UV Curable Coatings
UV curable coatings require energy directly from UV light to initiate monomers and oligomers. Through this process, it will then
convert the liquid coating into the solid film. One thing that
makes UV curable coatings become more and more popular is
they reduce energy costs and drying speeds during production
are faster.
Photoinitiators and light stabilizers usually are in conflict with
one another in the UV curable system. UR series are high-performance liquid-based light stabilizers and they do not affect curing speed. Before and after exposure of delta Y measurements
(as shown in Figure 4) and adding UR series, coatings would receive different degrees of protection according to its use level.
Evidently, a higher use level provides a better protection.
Conclusion
Environmentally friendly coatings are the trend for future development in the coatings industry. In this article we highlighted
the benefits of using light stabilizers in various coating systems.
Coating manufactures may still need to run the experiments to
confirm their coating systems are compatible. The company who
can offer tailor-made UV absorber and light stabilizer products
will have the key to providing UV protection in the manufacturer’s coating products. CW
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