紫外线光吸收剂Lowilite 55 Ultraviolet Light Absorber Lowilite 55 is an ultraviolet light absorber belonging to the benzotriazole class of UVAs. 2-(2´-Hydroxy-5’-methylphenyl)benzotriazole CAS Reg. Number [2440-22-4] Typical Properties Appearance Slightly Yellow powder Bulk density (g/ml) 0.54 Molecular weight 225 Specific Gravity @ 20°C 1.38 Melting Range, C 128 - 132 Flash point, °C 205 Thermogravimetric Analysis ( 10 mg @ 10°C/minute under N2) Weight Loss, % 5 10 25 Temperature,°C 163 178 197 Solubility @ 20°C (g/100 ml solvent) Acetone 2.5 Styrene 7.2 Dioctyl phthalate 2.5 Toluene 6.0 Ethanol 0.3 Methyl cellosolve 1.7 N N N HO CH3 Ethyl Acetate 3.5 Mineral Spirits 1.5 Lowilite 55 offers ultraviolet light protection to a wide range of polymers. It is a strong absorber of ultraviolet radiation and has a high degree of photostability. Photochemical energy absorbed in the ultraviolet region is dissipated as thermal energy. High absorptivity combined with photostability and the ability to release absorbed energy make Lowilite 55 an excellent stabilizer against the detrimental effects of ultraviolet light.
