UV absorbers

Because the Sun's rays contains large amounts of harmful ultraviolet light colored objects, the wavelengths around 290-460 NM, these harmful ultraviolet light through chemical oxidation-reduction (Redox reaction) so that the color down to fade.

Prevents harmful ultraviolet light to color method of the destruction of both physical and chemical.

This is just a brief introduction to chemical methods, that use ultraviolet absorbent on protected objects implement effective prevention or weaken its damage to color.

UV absorbers should satisfy the following conditions

① to strongly absorb UV light (especially wavelength 290-400nm);

II the good thermal stability, even if will not change because of the heat in the processing, hot volatile small;

③ good chemical stability, no adverse reaction with the material components in products;

④ good compatibility, can be uniformly dispersed in the material, not blooming, not exudate;

⑤ good absorbent itself photochemical stability, does not decompose, do not change color;

⑥ colorless, non-toxic, odorless;

⑦ dipping;

⑧ cheap and easy to get;

Insoluble, or difficult to dissolve in water.

Chemical structure of UV absorbers can be divided into the following categories: salicylic acid phenyl ester, ketone, benzo-triazole class, triazine, replacing acrylonitrile and hindered amine.