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Types and Applications of Photoinitiators
Release time:
2026-04-10
As a dedicated manufacturer of UV-curable resins, we are committed to advancing industry transparency and expertise. Today, we release a technical brief diving into the "engine" of UV curing formulations: the Photoinitiator (PI).
Photoinitiators are the critical components that absorb light energy to trigger polymerization. Based on their mechanism, they are primarily categorized into two industrial standards:
Free Radical Photoinitiators: The dominant force in the market.
* Type I (Cleavage): Examples include 184 and TPO. These absorb light and directly split to generate radicals. Known for rapid curing and resistance to oxygen inhibition, they are widely used in wood coatings and 3D printing.
* Type II (Hydrogen Abstraction): Examples include Benzophenone and ITX. These require amine synergists and are often utilized in pigmented ink systems.
Cationic Photoinitiators: Primarily used for epoxy systems. They offer unique advantages such as freedom from oxygen inhibition and "dark cure" capabilities, effectively reducing shrinkage stress.
With the rapid adoption of UV LED technology, long-wavelength PIs (like TPO) and macromolecular initiators with low migration properties are becoming the R&D focus to meet strict requirements for food packaging and deep-section curing.
"Understanding PI mechanisms is the foundation for customizing high-performance resin formulations for our clients," says our Technical Director. "We remain dedicated to optimizing our initiation systems to match evolving light source technologies and application scenarios."
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