July 21, 2022 Longchang Chemical

UV light curing powder coatings and their advantages

The main feature of UV powder coatings is that the process is divided into two distinct phases, with no early curing of the resin occurring during the melt leveling phase, thus providing ample time for the coating to fully level and expel air bubbles; the use of UV curing technology can significantly reduce the heating and curing process temperatures and improve production efficiency. The use of UV curing technology significantly reduces the temperature of the heating and curing process, increasing productivity and making UV coatings suitable for all types of heat sensitive substrates.

Compared to UV-cured liquid coatings, light-cured powder coatings have no active thinner, low film shrinkage and high adhesion to the substrate. Light-cured powder coatings can be applied in one coat to form a coating of excellent quality with a thickness of 75~125μm. Therefore, light-curing powder coatings are also solvent-free and environmentally friendly, and have higher technical, economic and ecological advantages than thermosetting powder coatings and UV liquid coatings.

Light-curing powder coatings consist of a main resin, photoinitiator, pigments, fillers, various additives and so on. The main resin is the main film-forming substance of light-curing powder coatings, and is the main component that determines the nature of the coating and the performance of the coating film. Formulation of light-curing powder coatings, on the one hand, the resin is required to give the powder good storage stability, on the other hand, the raw materials used must be at a lower temperature (such as 100 ℃ under) with the required melt viscosity, in order to ensure that the coating in the light curing before and light curing process with good flow and leveling properties, followed by light curing reaction below 120 ℃. The main resins that have been developed are generally unsaturated polyesters, vinyl ether resins, unsaturated polyester acrylates, urethane acrylates, epoxy resins etc.

The addition of hyperbranched resins can reduce the glass transition temperature of the resin, resulting in improved rheological properties and coating film performance. Hyperbranched polymers have high functionality, spherically symmetrical three-dimensional structure and inter- and intramolecular structure characteristics such as chain entanglement, low viscosity, good inter-solubility, high activity, and it is easy to modify the surface of multiple functional groups and other characteristics, can be used in coatings as film-forming substances, viscosity modifiers, etc., to improve the performance of the coating film.

The initiator can be selected from a wide range of species, such as the use of α-hydroxy ketone (AHK) and double acyl phosphine oxide (BAPO) combination, AHK because of its insensitivity to oxygen-blocking and the resulting coating has good surface properties, and in its structure of the benzene ring substituent on the opposite side of a polar hydroxy ethyl oxygen substituent and make the compound in UV-curable powder coatings extrusion and film-forming temperature under the low volatility. BAPO has two significant absorption peaks at about 370nm and 400~450nm, with high photoreactivity and absorption characteristics, can meet the needs of deep curing; cationic curing system can be used sulfonium salt, iodonium salt, etc.

UV Photoinitiator Same series products

Product name CAS NO. Chemical name
Sinocure® TPO 75980-60-8 Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide
Sinocure® TPO-L 84434-11-7 Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate
Sinocure® 819/920 162881-26-7 Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide
Sinocure® 819 DW 162881-26-7 Irgacure 819 DW
Sinocure® ITX 5495-84-1 2-Isopropylthioxanthone
Sinocure® DETX 82799-44-8 2,4-Diethyl-9H-thioxanthen-9-one
Sinocure® BDK/651 24650-42-8 2,2-Dimethoxy-2-phenylacetophenone
Sinocure® 907 71868-10-5 2-Methyl-4′-(methylthio)-2-morpholinopropiophenone
Sinocure® 184 947-19-3 1-Hydroxycyclohexyl phenyl ketone
Sinocure® MBF 15206-55-0 Methyl benzoylformate
Sinocure® 150 163702-01-0 Benzene, (1-methylethenyl)-, homopolymer,ar-(2-hydroxy-2-methyl-1-oxopropyl) derivs
Sinocure® 160 71868-15-0 Difunctional alpha hydroxy ketone
Sinocure® 1173 7473-98-5 2-Hydroxy-2-methylpropiophenone
Sinocure® EMK 90-93-7 4,4′-Bis(diethylamino) benzophenone
Sinocure® PBZ 2128-93-0 4-Benzoylbiphenyl
Sinocure® OMBB/MBB 606-28-0 Methyl 2-benzoylbenzoate
Sinocure® BP 119-61-9 Benzophenone
Sinocure® 754 211510-16-6 Benzeneacetic acid, alpha-oxo-, Oxydi-2,1-ethanediyl ester
Sinocure® CBP 134-85-0 4-Chlorobenzophenone
Sinocure® MBP 134-84-9 4-Methylbenzophenone
Sinocure® EHA 21245-02-3 2-Ethylhexyl 4-dimethylaminobenzoate
Sinocure® DMB 2208-05-1 2-(Dimethylamino)ethyl benzoate
Sinocure® EDB 10287-53-3 Ethyl 4-dimethylaminobenzoate
Sinocure® 250 344562-80-7 (4-Methylphenyl) [4-(2-methylpropyl)phenyl] iodoniumhexafluorophosphate
Sinocure® 369 119313-12-1 2-Benzyl-2-(dimethylamino)-4′-morpholinobutyrophenone
Sinocure® 379 119344-86-4 1-Butanone, 2-(dimethylamino)-2-(4-methylphenyl)methyl-1-4-(4-morpholinyl)phenyl-
Sinocure® 938 61358-25-6 Bis(4-tert-butylphenyl)iodonium hexafluorophosphate
Sinocure® 6992 MX 75482-18-7 & 74227-35-3 Cationic Photoinitiator UVI-6992
Sinocure® 6992 68156-13-8 Diphenyl(4-phenylthio)phenylsufonium hexafluorophosphate
Sinocure® 6993-S 71449-78-0 & 89452-37-9 Mixed type triarylsulfonium hexafluoroantimonate salts
Sinocure® 6993-P 71449-78-0 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate
Sinocure® 1206 Photoinitiator APi-1206

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