The radiation crosslink of UV LEDs to colored coatings

One study described radiation crosslinking of colored coatings that promotes deep curing and prevents oxygen suppression.
LED light source emits light in smaller wavelength regions, such as blue light and UV-A. These LEDs can be applied to radiation curing through free-based polymerization, a growing industry in the coatings industry

. LEDs are expected to replace mercury arc lamps as light sources, but the development of higher-intensity LEDs and LEDs in the UV-B or UV-C range is still under way.
report, the efficiency of the trigger system on UDMA photo polymerization was analyzed. Selected systems are commonly used in the coatings industry, while other systems are invented in dentistry and holographic surgery. The aim is to use UV LEDs to deeply cure UDMA at 365 nm, 395 nm and 405 nm.
Inspective light effects
discusses the overlap between the absorbence of the trigger system and the LED emission, involving the top layer of refraction and thickness of up to 20 mm, thus gaining insight into the effects of the light source and the reactivity or spectral properties of the trigger system during light polymerization.
is surprising that trigger systems such as Ivocerin and HABI-mercapto are less common as triggers for coating curing and show high efficiency. Even the coloring and filling systems can be cured to a depth of 4-20 mm, respectively. In addition, applying UV-C LEDs at 278 nm and using these triggers also reduces surface viscosity caused by oxygen inhibition.
the study was published in July 2020 in volume 144 of Organic Coatings Progress.