Akademik Veri Yönetim Sistemi
Vlakna a Textil, cilt.25, sa.3, ss.30-36, 2018 (Scopus)
In the current study, it is aimed to evaluate the hardness and gloss properties of water-based
UV curable polyurethane (PU) acrylate films by using two types of photoinitiators at different ratios. For this
purpose, UV curable water-based unpigmented and pigmented formulations were prepared. Formulations
were applied on glass plates and UV cured under gallium and mercury (Ga/Hg) lamps at three different
power levels, i.e., 60, 90 and 120 W/cm. After UV curing process, gloss and hardness values of polymeric
films were measured. The highest film hardness values implying the highest curing level was obtained with
the formulation A1, including only Omnirad® 819 DW (former Irgacure® 819 DW) which is effective in
deep curing, and formulation A3 including Omnirad® 819 DW and Omnirad® 500 (former Irgacure® 500)
effective in surface and deep curing at 2:1 ratio, respectively. Among these two formulations, the highest
gloss value was obtained with the formulation A3. GaHg lamp combination provided the highest gloss
values while highest film hardness values were obtained with GaHg and GaGaHg lamp combinations.
Compared to clear films, pigmented films rendered higher gloss values which was more prominent
in single lamp (Ga, Hg) cured films. Results showed that photoinitiators (Omnirad® 819 DW and
Omnirad® 500) provided better hardness and gloss values at 1:1, 1:2 and 2:1 ratios. Gloss values
increased due to the increase in film hardness. The increase in the total applied energy resulted
in an increase in the film hardness values of all clear and pigmented formulations. In terms of film
hardness and gloss values, films prepared with Omnirad® 819 DW and Omnirad® 500 at 1:1 ratio and
cured under GaHg lamp combination provided better results