As the "switch" of photocuring technology, the composition of photoinitiators directly affects the reaction efficiency. The main raw materials are divided into two categories:
Aromatic ketones: such as benzophenone and thioxanthrone, which generate free radicals by absorbing ultraviolet light.
Catonic ketones: such as iodonium salts and thioxanthrone, which release Lewis acids under light irradiation.
Co-initiators: Amine compounds (such as methyldiethanolamine) are often used as synergistic components.
The chemical reaction code of raw materials: Different combinations of raw materials are like chemical "formulas," producing unique effects:
Wavelength matching: Thioxanthrones are suitable for 365nm ultraviolet light, while camphorquinone is matched with visible light.
Solubility characteristics: Some raw materials need to be combined with acrylate monomers to improve compatibility.
Safety: Modern environmentally friendly raw materials are gradually replacing traditional chlorine-containing compounds.
Raw material selection in industrial applications: In actual production, raw material selection needs to consider multiple factors:
Printing inks prefer low-odor thiol co-initiators.
Electronic packaging requires high-purity iodonium salt raw materials.
3D printing photosensitive resins often use two-component initiation systems.
Wood coatings often use modified benzophenone with good penetration.
