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Mechanism of UV absorber
Release time:
2023-09-27
Mechanism of UV absorber
1. The reason why ultraviolet absorbers can absorb ultraviolet light is due to the fact that the molecules of such compounds contain the structure of the conjugated π-electron system and the structure capable of hydrogen atom movement in two parts. There are also only the first part.
2, the structure of ultraviolet absorber molecules contain at least one neighbouring hydroxyl phenyl substituent, such compounds by the neighbouring hydroxyl and nitrogen or oxygen atoms to form a chelating ring, in the absorption of ultraviolet light, the hydrogen bond breakage occurs molecular isomerism, the structure of the molecule thermal vibration, the destruction of the hydrogen bond, the chelating ring opens, the structure of the molecule changes, so that the harmful ultraviolet light into harmless thermal energy release, thereby protecting the material.
3, in this process, the chelating ring formed within the molecule is the key to its function of absorbing ultraviolet rays, open this ring of energy-sensitive range is exactly 290 ~ 400nm wavelength of ultraviolet energy range.
4, in addition, as a UV absorber, but also in the role of ultraviolet light or visible light does not carry out photochemical reactions; good stability of chemicals and water, good thermal stability; volatility is small; good compatibility with polymer materials and not be solvent extraction and so on.
Ultraviolet absorber should have the conditions
1, can strongly absorb ultraviolet light (especially the wavelength of 290-400nm);
2, good thermal stability, even in the processing will not change due to heat, thermal volatility is small;
3, good chemical stability, does not react unfavourably with the material components in the products;
4, good miscibility, can be uniformly dispersed in the material, no spray frost, no oozing;
5, good photochemical stability of the absorber itself, no decomposition, no discolouration;
6, colourless, non-toxic, non-odorous;
7, resistant to immersion washing;
8, inexpensive, easy to obtain;
9, insoluble, or insoluble in water.
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