At present, the ideal UV absorbers/light stabilizers are mostly compound types, especially salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines The combination of UV absorbers and hindered amines can achieve a more rational effect than any single UV absorber. Application fields of UV absorbers: polymers (plastics, etc.), coatings (automotive spray paints, building finishes), printing inks, post-treatment of dyed/printed textiles, sunscreen cosmetics.
Because the sun rays contain A large amount of ultraviolet light harmful to colored objects has a wavelength of about 290-460 nanometers. These harmful ultraviolet lights cause the color molecules to decompose and fade through chemical redox reaction. Ultraviolet absorbers prevent harmful ultraviolet light from affecting There are both physical and chemical methods of color destruction.
Here is only a brief introduction to chemical methods, that is, using ultraviolet absorbers to effectively prevent protected objects, or weaken their effect on color The destruction of
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①It can strongly absorb ultraviolet rays (especially with a wavelength of 290-400nm);
②Good thermal stability, even during processing, it will not change due to heat, and the thermal volatility is small;
③Good chemical stability, no adverse reaction with the material components in the product;
④Good miscibility, can be evenly dispersed in the material, no frosting, no leakage;
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⑤The absorber itself has good photochemical stability, does not decompose and does not change color;
⑥Colorless, non-toxic and odorless;
⑦Dipping and washing resistance;,
8. Insoluble, or hardly soluble in water
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UV absorbers can be divided into the following categories according to their chemical structures: salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and hindered amines.
Tag:   UV Absorber Light Stabilizer
