Effect of temperature on mechanical properties and formability of coatings for pre-coated metal

ABSTRACT

To expand their applications, UV-curable coatings for pre-coated metal (PCM) require high flexibility and stiffness for formability and hardness, respectively. However, it is difficult to satisfy both properties of coatings. Therefore, this study was focused on each factor which affects the properties of UV-cured coatings or PCM. The curing conversion of UV-cured coatings was improved in oxygen-free atmosphere. The optimum UV irradiation for curing was 1500 mJ/cm². Adhesion of coatings and formability of PCMs were characterized by cross-cut test and cross-cut erichsen test, respectively at different temperatures. The results showed that the formability was much improved at an elevated temperature due to the increased flexibility.

KEYWORDS:

• Erichsen
• formability
• oxygen-free atmosphere
• UV-curable

Additional information

Funding

This work was supported by the Industry Core Technology Development Project of Research Funds of Ministry of Trade, Industry and Energy and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20174010201460) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1D1A1B03032434).