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Mrs. Xia:+86 13609745928
TEL:020-34379001
Fax:020-34379190

Website:en.gdbossin.com

Address: 802 Room,8 Floor,Pazhou Industrial Park B,8th St Haicheng East,Xingang East Rd,Haizhu District,Guangzhou


What is UV Photoinitiator?

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What is UV Photoinitiator?



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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: 1173TPO369, 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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Mrs. Xia:+86 13609745928      TEL:020-34379001      Fax:020-34379190     Website:en.gdbossin.com

Address: 802 Room,8 Floor,Pazhou Industrial Park B,8th St Haicheng East,Xingang East Rd,Haizhu District,Guangzhou

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