Characteristics, types and applications of UV absorbers
UV absorber is such a class of substances, it can absorb sunlight or fluorescent light source in the ultraviolet wavelength part, and its own physical properties, structure does not change. UV absorbers can be divided into the following categories according to their chemical structure: salicylates, benzophenones, benzotriazoles, substituted acrylonitrile, triazines, etc. The more common ones on the market are benzophenones, benzotriazoles and triazines. They all work on the principle of converting high-energy UV light energy into heat or non-destructive longer light waves released, thus protecting the organic materials with UV absorbers from UV damage.
UV absorbers as additives for polymer materials, generally require its initial color light, no color stain; and polymer materials have good compatibility; with processing requirements of heat resistance, chemical stability, etc.. If used in food packaging materials, UV absorbers are also required to meet the environmental requirements of food packaging and migration resistance.
Above we explain the role of UV absorbers is to selectively absorb the high energy of the light source of ultraviolet light, by energy conversion, so that the high energy of ultraviolet light into harmless thermal energy release or consumption. The type of polymer is different, so that its aging damage to the UV wavelength (sensitive band) is not the same. As the following table.
| Material Category | Sensitive waveband (nm) |
| Polyethylene | 300 |
| Polyvinyl chloride | 310 |
| Polystyrene | 318 |
| Polyester | 325 |
| Polypropylene | 310 |
| Vinyl Chloride – Ethyl Acetate Copolymer | 322-364 |
| Polycarbonate | 300-320 |
| Polycarbonate (PC) | 295 |
| Nitrocellulose | 310 |
| Polymethyl methacrylate | 290-315 |
| Thermoplastic resins | 290-320 |
| Unsaturated Polyester | 325 |
As the table shows, different types of polymer materials are sensitive to different wavelengths of ultraviolet light, and different UV absorbers can absorb different ranges of shielding light waves. Therefore, different resins choose the appropriate UV absorber to achieve good light stabilization effect.
In summary, as a UV absorber than the need to have the following conditions.
1, can strongly absorb UV ;
2, good chemical stability, no chemical reaction with other components in the material; good photochemical stability itself, not decomposition and discoloration.
3, good thermal stability, small volatility, and will not change due to heat in processing; ④
4、Good compatibility with polymer materials, can be uniformly dispersed in the material, no frosting, no precipitation ;
5, other properties, such as colorless, non-toxic, odorless; resistant to washing; cheap, easy to obtain.
Same series products
| Product name | CAS NO. | Chemical name |
| lcnacure® TPO | 75980-60-8 | Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide |
| lcnacure® TPO-L | 84434-11-7 | Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate |
| lcnacure® 819/920 | 162881-26-7 | Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide |
| lcnacure® ITX | 5495-84-1 | 2-Isopropylthioxanthone |
| lcnacure® DETX | 82799-44-8 | 2,4-Diethyl-9H-thioxanthen-9-one |
| lcnacure® BDK/651 | 24650-42-8 | 2,2-Dimethoxy-2-phenylacetophenone |
| lcnacure® 907 | 71868-10-5 | 2-Methyl-4′-(methylthio)-2-morpholinopropiophenone |
| lcnacure® 184 | 947-19-3 | 1-Hydroxycyclohexyl phenyl ketone |
| lcnacure®MBF | 15206-55-0 | Methyl benzoylformate |
| lcnacure®150 | 163702-01-0 | Benzene, (1-methylethenyl)-, homopolymer, ar-(2-hydroxy-2-methyl-1-oxopropyl) derivs |
| lcnacure®160 | 71868-15-0 | Difunctional alpha hydroxy ketone |
| lcnacure® 1173 | 7473-98-5 | 2-Hydroxy-2-methylpropiophenone |
| lcnacure®EMK | 90-93-7 | 4,4′-Bis(diethylamino) benzophenone |
| lcnacure® PBZ | 2128-93-0 | 4-Benzoylbiphenyl |
| lcnacure®OMBB/MBB | 606-28-0 | Methyl 2-benzoylbenzoate |
| lcnacure® 784/FMT | 125051-32-3 | BIS(2,6-DIFLUORO-3-(1-HYDROPYRROL-1-YL)PHENYL)TITANOCENE |
| lcnacure® BP | 119-61-9 | Benzophenone |
| lcnacure®754 | 211510-16-6 | Benzeneacetic acid, alpha-oxo-, Oxydi-2,1-ethanediyl ester |
| lcnacure®CBP | 134-85-0 | 4-Chlorobenzophenone |
| lcnacure® MBP | 134-84-9 | 4-Methylbenzophenone |
| lcnacure®EHA | 21245-02-3 | 2-Ethylhexyl 4-dimethylaminobenzoate |
| lcnacure®DMB | 2208-05-1 | 2-(Dimethylamino)ethyl benzoate |
| lcnacure®EDB | 10287-53-3 | Ethyl 4-dimethylaminobenzoate |
| lcnacure®250 | 344562-80-7 | (4-Methylphenyl) [4-(2-methylpropyl)phenyl] iodonium hexafluorophosphate |
| lcnacure® 369 | 119313-12-1 | 2-Benzyl-2-(dimethylamino)-4′-morpholinobutyrophenone |
| lcnacure® 379 | 119344-86-4 | 1-Butanone, 2-(dimethylamino)-2-(4-methylphenyl)methyl-1-4-(4-morpholinyl)phenyl- |