Benzophenone fragment and p-nitrodiphenylethene fragment-containing tree like visible light photoinitiator and synthesis and application thereof

Abstract

The invention relates to a benzophenone fragment and p-nitrodiphenylethene fragment-containing tree like visible light photoinitiator and synthesis and application thereof, belonging to the field of photoinitiators. The tree like visible light photoinitiator comprises the typical chemical structural general formulae shown in the description, wherein n1 and n2 in molecular structural formulae (I) and (II) represent 1-6, wherein in the molecular structural formula (I), the (I) is prepared through reacting 4-(4'-bromohydrocarbylstyyl) nitrobenzene with 3,5-dihydroxylbenzyl alcohol to obtain a product of 3,5-di((4'-nitrobenzenevinyl)benzene alkoxide)benzyl alcohol, and then reacting the 3,5-di((4'-nitrobenzenevinyl)benzene alkoxide)benzyl alcohol with 4-bromomethylbenzophenone under alkaline conditions; and in the molecular structural formula (II), the (II) is prepared through reacting 4-bromohydrocarbylbenzophenone with 3,5-dihydroxylbenzyl alcohol to obtain a product of 3,5-di((4'-benzoyl)benzene alkoxide)benzyl alcohol, and then reacting the 3,5-di((4'-benzoyl)benzene alkoxide)benzyl alcohol with 4-(4'-hydroxylstyryl)nitrobenzene under alkaline conditions. The benzophenone fragment and p-nitrodiphenylethene fragment-containing tree like visible light photoinitiator has the maximum absorption in a visible light region and can be used as the photoinitiator to form a photosensitive system together with a triethanolamine auxiliary agent and used for visible light polymerization of alkene monomers in a solution or used as photocuring materials.

Description

technical field The invention belongs to the field of visible light initiators, in particular to branched visible light photoinitiators containing benzophenone segments and p-nitrostilbene segments. Background technique In recent years, long-wavelength lasers such as Ar+ (488nm, 514nm), YAG (532nm), and He-Ne (633nm) have been widely used in computer-to-plate, photocuring, two-photon photopolymerization, and high-density digital optical storage. Efficient visible light photoinitiators have become an important field of optical information research. One approach is to attach a UV photoinitiator to a visible light dye through a chemical bond. Koichi Kawamura found that the ultraviolet photoinitiator trichloro-s-triazine attached to the visible light cyanine dye can increase the absorption light to 500-600nm. The title is: "Synthesis and evaluation of a new dye-linked bis(trichloromethyl )-1,3,5-triazine as visible light photopolymerization initiator"(Synthesis and evaluation ...

AI Technical Summary

Problems solved by technology

However, the synthesis steps of these compounds are many, the initiation efficiency is not high, and trichloro-s-triazine often produces harmful gases such as chlorine gas, so it will be subject to many restrictions in practical application.

Benzophenone is a commercialized UV photoinitiator, but its absorption wavelength is very short, between 250-300nm, and there is almost no absorption in the visible region

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