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Classification and role of ultraviolet absorbers
Release time:
2023-09-27
According to the chemical structure, UV absorbers can be classified into salicylates, phenyl ketones, benzotriazoles, substituted acrylonitrile, triazines and hindered amines.
Benzotriazoles
This class of compounds is the largest production of ultraviolet absorbers, the most varieties of a class of products, domestic and foreign research is also very active. The synthesis of benzotriazole ultraviolet absorber is generally to make the aromatic amine diazotization to generate diazonium salt, diazonium salt and phenolic compounds coupling reaction to generate the intermediate azo pigment, and then by reducing the closed loop into.
Benzophenone
The output and variety of this kind of ultraviolet absorber are second only to benzotriazole.
The synthetic route is basically a two-step reaction, i.e. the synthesis of 2,4-dihydroxybenzophenone and alkoxybenzophenone.
Ultraviolet absorber research direction
1、Polymer quality
Reduce the volatility of additives, reduce the loss of the reaction process
2、Multi-functionalisation
Make a stabiliser molecule with different functional groups at the same time, play a variety of stabilizing effects (heat stabilizer, antioxidant ......)
3、Reactive
The reactive group is introduced into the light stabiliser molecule, so that it is bonded to the base polymer during processing, and thus permanently exists in the polymer material.
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