Benzotriazole dye as well as synthesis and application thereof

Abstract

The invention relates to a benzotriazole dye compound which is characterized by being represented by the chemical general formula in the specifications, wherein in the structural formula (I), R represents OH and OCH3. A synthesis method of the compound comprises the following steps of: (1) synthesizing 2-(2-nitro)azobenzene-4-formaldehyde-phenol; (2) synthesizing 2-(2-hydroxyl-5-formaldehyde)-2H-benzotriazole; (3) synthesizing 2-(2-methoxy-5-formaldehyde)-2H-benzotriazole; and (4) synthesizing a benzotriazole derivative. In the invention, benzotriazole is chemically modified, so that the absorption wavelength of benzotriazole is extended to more than 400nm. The benzotriazole can be used as a visible light photosensitizer and a photoinitiator or other assistants to form a photosensitive system to be used for visible light polymerization of an allyl monomer, and can also be used a photocuring material.

Description

technical field The invention belongs to the field of visible light photosensitizers, in particular to benzotriazole dyes and their synthesis and application. Background technique Efficient visible light photoinitiator system is an important field in photopolymerization research. With the development of laser imaging and photocuring technology, photosensitive polymer materials such as photoresist, photocurable ink, coating and photosensitive printing plate have been developed rapidly. A key technology in photofunctional materials is how to extend the spectral response range to long wavelengths and obtain high photosensitivity. Therefore, the development of new high-sensitivity and low-energy photopolymerization initiation systems that are sensitive to long-wavelength visible lasers has become a hot research topic today. One way to shift the spectral absorption of the initiator to the long-wavelength region is to find a suitable visible light photosensitizer according to th...

AI Technical Summary

Problems solved by technology

The title is: "Photoreaction and photopolymerization studies on squaraine dyes / iodonium salts combination", "Journal of Photochemistry and Photobiology A: Chemistry" (Photochemistry and Photobiology Journal A : Chemistry), 2004, 162(2-3): 463-471. Under the illumination of visible light, squaraine sensitizes the ultraviolet photoinitiator iodonium salt as a visible light photosensitizer, and generates free radicals through intermolecular photoinduced electron transfer Initiate the polymerization of vinyl monomers, however, the solubility of this type of dye is not very good, and its initiation efficiency needs to be improved

Traditional photoinitiators include benzophenone, trichloromethyl-s-triazine, iodonium salt, benzoin ether and its derivatives and biimidazole, etc. These photoinitiators have high initiation efficiency, but they can only absorb 200-300nm ultraviolet light, almost no absorption in the visible light region

Images