Synthesis and properties of UV-curable polyurethane acrylates based on different polyols for coating of metal sheets

ABSTRACT

The UV-curable coatings are emerging as new environmental friendly coating technology for replacement of solvent-based ones. UV-curable polyurethane acrylate oligomers were newly synthesized using cycloaliphatic polyisocyanate and polycaprolactone polyol, polycarbonate polyol or cycloaliphatic polyester polyol, and their cured properties were investigated by differential scanning calorimeter, thermogravimetric analysis and dynamic mechanical analysis. The results showed that the cycloaliphatic polyester polyol-based film showed better properties on UV resistance, accelerated weathering, water resistance and chemical resistance. It might be attributed to its unique structure with 1,4‐substitution.

KEYWORDS:

• Cycloaliphatic polyester polyol
• polyurethane acrylate
• UV curable coatings

Additional information

Funding

This work was supported by the Industry Core Technology Development Project of Research Funds of Ministry of Trade, Industry and Energy, Korea and also by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, Korea ((NRF-2017R1A2B3012961); Brain Korea 21 Plus Program (21A2013800002)).