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UV absorbers should meet the following conditions
① can strongly absorb ultraviolet light (in particular, a wavelength of 290-400nm); good thermal stability, even in the processing will not change due to thermal, thermal volatile small; good chemical stability, no materials and products occurrence of adverse reactions to the components; the miscibility can be evenly dispersed in the material, not blooming, not oozing; ⑤ The absorbent photochemical stability, is not biodegradable, does not change color; ⑥ The colorless, non-toxic, odorless; the resistance dip; the inexpensive, easy to get,; 9. insoluble, or insoluble in water, UV absorbers according to the chemical structure can be divided into the following categories: salicylic acid ester, phenyl ketones, benzo triazole to replace acrylonitrile class, triazine and hindered amine.