Triazine UV absorbers are a relatively new product that is mainly used to eliminate UV damage to materials. Compared with other types of ultraviolet absorbers, such as benzophenones and benzo**, triazines have the advantages of high efficiency, high temperature resistance, light color and good compatibility, especially with 2-(2'-Hydroxyphenyl)-1,3,5-triazines are typical representatives.
The mechanism of action of triazine ultraviolet absorbers is due to chelating rings composed of intramolecular hydrogen bonds. When UV light is absorbed, the intramolecular hydrogen bonds are broken to form unstable high-energy ionic compounds, and then excess energy is released to restore the original low-energy stable state, thereby absorbing UV light. The actual application effect shows that the triazine ultraviolet absorber containing more ortho-hydroxyl groups has better absorption effect, but this will lead to the darkening of the product color and affect the application of light-colored products.
Triazine UV absorbers are widely used in food, daily necessities packaging, textiles, natural or synthetic resins, rubber, fibers, coatings and paints. Especially in terms of color retention and degradation time of automotive coatings, it is more effective than other types of UV absorbers.
Although there is relatively little research and application of triazine UV absorbers in China, there are some marketed products, such as UV-1577, UV-1164, UV-400 and triazine-5. Internationally renowned chemical companies, such as BASF and CYTEC, have achieved remarkable results in the research and development and product application of triazine.
In general, the development of high-efficiency triazine ultraviolet absorbers, the development of new structures and the improvement of product performance are of great practical significance in reducing costs, reducing environmental pollution, and facilitating large-scale production. Domestic enterprises have a long way to go in the research and development of new product structure.