July 10, 2022 Longchang Chemical

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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Photoinitiator TPO CAS 75980-60-8
Photoinitiator TMO CAS 270586-78-2
Photoinitiator PD-01 CAS 579-07-7
Photoinitiator PBZ CAS 2128-93-0
Photoinitiator OXE-02 CAS 478556-66-0
Photoinitiator OMBB CAS 606-28-0
Photoinitiator MPBZ (6012) CAS 86428-83-3
Photoinitiator MBP CAS 134-84-9
Photoinitiator MBF CAS 15206-55-0
Photoinitiator LAP CAS 85073-19-4
Photoinitiator ITX CAS 5495-84-1
Photoinitiator EMK CAS 90-93-7
Photoinitiator EHA CAS 21245-02-3
Photoinitiator EDB CAS 10287-53-3
Photoinitiator DETX CAS 82799-44-8
Photoinitiator CQ / Camphorquinone CAS 10373-78-1
Photoinitiator CBP CAS 134-85-0
Photoinitiator BP / Benzophenone CAS 119-61-9
Photoinitiator BMS CAS 83846-85-9
Photoinitiator 938 CAS 61358-25-6
Photoinitiator 937 CAS 71786-70-4
Photoinitiator 819 DW CAS 162881-26-7
Photoinitiator 819 CAS 162881-26-7
Photoinitiator 784 CAS 125051-32-3
Photoinitiator 754 CAS 211510-16-6 442536-99-4
Photoinitiator 6993 CAS 71449-78-0
Photoinitiator 6976 CAS 71449-78-0 89452-37-9 108-32-7
Photoinitiator 379 CAS 119344-86-4
Photoinitiator 369 CAS 119313-12-1
Photoinitiator 160 CAS 71868-15-0
Photoinitiator 1206
Photoinitiator 1173 CAS 7473-98-5

 

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