UV ink basic components: photosensitizer and light sensitizer
Photosensitizers are molecules that absorb light energy and then transfer the energy to the photoinitiator, and return to their initial inactive state after transferring the energy.
Photosensitizer properties: photosensitizers and photoinitiators are the same point is that they can trigger the polymerization of monomers or prepolymers, the difference is that photosensitizers do not cross-linked branches in the monomer or prepolymer molecules, but will receive light energy transferred to the photoinitiator and its own reduction; add different photosensitizers can absorb a wider range of UV light or visible light and other light waves, and then the energy will be converted to the photoinitiator to promote polymerization, which can expand the light The light-sensitive range of the photoinitiator can be expanded, such as the addition of long-wavelength light-sensitive photosensitizers in dark ink can improve the curing effect of long-wave UV light to promote the curing of dark colors, large particles, masking ink.
Disadvantages: Most photosensitizers are organic compound molecules that absorb energy in the visible region, so the ink will trigger curing in visible light and is not conducive to the use and storage of ink and manufacturing, and most photosensitizers are colored or its photochemical reaction products colored not suitable for printing.
Photo-sensitizers
Photo sensitizers are molecules (usually amines) that do not absorb radiation and do not initiate polymerization, but can increase the effective rate of activity of photoinitiators.
Light sensitizer (light activator or light enhancer) characteristics: light sensitizer role is to increase the photoinitiator sensitization rate, accelerate the curing of ink. Currently often use amine sensitizer selection should pay attention to several aspects. Sensitizers are not film-forming substances are volatile, some amines such as triethylamine volatile odor is not suitable for printing inks.
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