Abstract
A trifunctional photoinitiator based on commercial photoinitiators 2-hydroxy-2-methylpropiophenone (Irgacure1173) and 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure2959) was synthesized by an esterization reaction. Its structure was characterized by UV-Vis spectrometry, Infrared Transformed Fourier, Proton Nuclear Magnetic Resonance Spectra, 13 Carbon Nuclear Magnetic Resonance Spectra, Mass Spectrometry, and Thermogravimetry. In addition, its photoinitiating activity was investigated. The results showed that the novel photoinitiator had good photoinitiating activity and thermal stability compared to commercial photoinitiators. The migration of the residual photoinitiator in the cured film was lower than that of 1173 and 2959.
Highlights
UV curing technology has been developed quickly due to its high efficiency, environmental friendliness, energy savings, and good economics [1,2,3]
UV systems consist of photoinitiators, oligomers, reactive diluents, and other additives
Residual radicals or photoinitiators can induce yellowing and migration in the system, which can affect the properties of UV-cured materials
Summary
UV curing technology has been developed quickly due to its high efficiency, environmental friendliness, energy savings, and good economics [1,2,3]. Residual radicals or photoinitiators can induce yellowing and migration in the system, which can affect the properties of UV-cured materials. For this reason, the current trend of UV-curing formulations is towards the development of photoinitiators that simultaneously have high activity, less yellowing, and relatively low migration [21,22,23,24]. The current trend of UV-curing formulations is towards the development of photoinitiators that simultaneously have high activity, less yellowing, and relatively low migration [21,22,23,24] To overcome these disadvantages of yellowing and migration, some larger molecular weight photoinitiators have been explored [25,26,27,28,29,30]. The new photoinitiator has potential applications for food and drug packages
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