What is UV Photoinitiator?-Guangdong Bossin Novel Materials Technology Co.,Lt

What is UV Photoinitiator?

Photoinitiator, also known as photosensitizer or photocuring agent, is a compound that can produce reactive species after absorbing a certain wavelength energy. These reactive species are capable of initiating or catalyzing chemical reactions, which then trigger the monomers or oligomers to undergo polymerization. This process is called photopolymerization or radiation curing or photocuring, the light used as the energy provider is most often Ultraviolet, that’s why photoinitiator often refers to UV photoinitiator.

UV Photoinitiator is the essential composition of all UV curable resin systems, it transforms a soluble liquid formulation into a hard and insoluble crosslinked polymer network. The cured coating is chemically and physically resistant and is used both to protect and decorate substrates such as plastics, wood and metal.

Photocuring technology is a new energy-saving and environment-friendly technology. The light source (most commonly is Ultraviolet, sometimes visible light), used in radiation curing is fully in line with the “5E” characteristics: Efficient, Enabling, Economical, Energy Saving, Environmental Friendly. Therefore, it is known as “green technology’, and widely used in UV-curable paints, coatings, inks, adhesives industries.

Photoinitiators can be classified into two categories, according to the initiation mechanism. There are free radical initiators and cation initiators.

A photoinitiator should exhibit several properties, from which the most important are:

*High absorption at the exposure wavelength and high molar extinction coefficient.

*High quantum yield of formation of initiating species.

*High reactivity of the radical towards the monomer.

Photoinitiators tend to make up a few percentage of the formulation, but the cost represents a much higher proportion of the formulation. The photoinitiator type is chosen for the absorption to be maximized to match the output of the UV source being used.The most commonly used photoinitiators include: 1173, TPO, 369, 819, 184 etc.

The most commonly used photoinitiators include:

Product Coda	Chemical Name	Apperance	Weight (g/mol)	Absorption Wavelength (nm)	Characteristics	Applications
184	1-Hydroxycyclohexyl Phenyl Ketone	White crystals	204.3	246 280 330	High-efficient Surface curing; yellowing resistance; Cost-effective	Used for varnish for plastic, matal and wood
1173	2-Hydroxy-2-Methyl-Phenyl- Propane-1-One	Light yellow clear liquids	164.2	245 281 331	High-efficient Surface curing; yellowing resistance; Cost-effective	Used for varnish for plastic, matal and wood
TPO	2,4,6-Trimethylbenzoyldiphenyl Phosphine Oxide	Light yellow solid	348.4	295 380 393	High-efficient; Deep curing; yellowing resistance	Used for varnish for plastic, matal and wood; Suitable for color paint and white paint, UV inks(Silk -screen, offect, flexography)
TPO-L	2,4,6-Trimethylbenzoyldi- Phenylphosphinate	Yellow liquid	316.3	242 280 370	Low odor; Deep curing; High-efficient; yellowing resistance	Used for varnish for plastic, matal and wood; Suitable for color paint and white paint
ITX	2-Isopropylthioxanthone	Light yellow solid	254.1	255 380	High-efficient; coloured; Works well on deep layer curing when cooperated with 907	Used for UV inks
369	2-Benzyl-2-(dimethylamino)-1- [4-(4-morpholinyl)phenyl]-1-butanone	Light yellow powder	366.5	233 324nm	Wide sensitive range and good UV absorption ability; Low molecule migration; Low odor	Used for UV inks; Suitable for dark-color fast-curing system
(BDK) 651	Benzil Dimethyl Ketal	White crystals	256.3	250 337	Coloured; High-efficient; Surface curing; Excellent UV absorption to the system of PCB and varnish	UV paint for plastic and metal; PCB ink
819	PHenylbis(2,4,6-Trimethyl-Benzoyl) PHosPHine Oxide	Yellow powder	418.4	295 370	High-efficient; Deep curing;	Use for UV inks and paint.
907	2-Methyl-1-[4(Methylthio)Phenyl] -2-Morpholinopropanone-1	White powdered crystal	279.4	232 240 307	Coloured; High-efficient; Excellent UV absorption to the color system when work with ITX	Use for UV inks.
BP	Benzophenone	White flake solid	182.2	253 345	Surface curing; Low-cost	Used for varnish for plastic, matal and wood.
PBZ	4-Benzoylbiphenyl	White powder	258.3	289	Surface curing; Low yellowing; Low odor	Used for varnish for plastic, matal and wood.
BI-750C	New photoinitiator	Light yellow clear liquids	-	-	Low odor; Good Compatibility; yellowing resistance; Curing Fast for Surface; Replace 1173,184,MBF	Used for UV inks,UV Coating,UV adhesive

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