The ultraviolet absorber is a light stabilizer that absorbs the ultraviolet part of the sunlight and the fluorescent light source, and does not change itself. Plastics and other polymer materials produce automatic oxidation reaction under UV and sunlight, resulting in degradation and deterioration of polymers, resulting in deterioration of appearance and mechanical properties. After adding ultraviolet absorbents, this high energy ultraviolet ray can be selectively absorbed to make it become harmless energy and release or consume. Due to the different kinds of polymers, the UV wavelengths of their degradation are also different. Different ultraviolet absorbers can absorb different wavelengths of ultraviolet. When applied, UV absorbers should be selected according to the type of polymer.

 

 

紫外线吸收剂应该具备以下条件：①可强烈地吸收紫外线（尤其是波长为290-400nm）；②热稳定性好，即使在加工中也不会因热而变化，热挥发性小；③化学稳定性好，不与制品中材料组分发生不利反应；④混溶性好，可均匀地分散在材料中，不喷霜，不渗出；⑤吸收剂本身的光化学稳定性好，不分解，不变色；⑥无色、无毒、无臭；⑦耐浸洗；⑧价廉、易得；⑨不溶,或难溶于水。

The ultraviolet absorbent should meet the following conditions: 1 can strongly absorb ultraviolet light (especially wavelength 290-400nm); second, good thermal stability, but also will not change due to heat even inshuiniban.89ix.com zhirongji.89ix.combaozhuangji.89ix.combaozhuang.89ix.comjianqiejif.89ix.com tongshiziw.89ix.com the machining process, the heat of low volatility and good chemical stability; and the products of material components occurred adverse reaction; the good miscibility. Can be uniformly dispersed in the material, no blooming, no exudation; the absorbent itself good photochemical stability, does not decompose, do not change color; the colorless, non-toxic, odorless and resistant; immersion; the cheap and easy to get; we do not dissolve, or difficult to dissolve in water.

紫外线吸收剂用于塑料、涂料、染料、汽车挡风玻璃、化妆品、药物、防晒剂等。

UV absorbers are used in plastics, coatings, dyes, car windshield, cosmetics, drugs, sunscreen and so on.

三．分类：

Three. Classification:

紫外线吸收剂按化学结构可分为以下几类：水杨酸酯类、苯酮类、苯并三唑类、取代丙烯腈类、三嗪类和其他类。以下是几种常见的紫外线吸收剂简介。

UV absorbers can be divided into the following categories according to their chemical structure: salicylate, benzophenone, benzo three azole, substituted acrylonitrile, three azine and other classes. The following are several common introduction of ultraviolet absorbents.