Preparation method of UV LED photoinitiator

Abstract

The invention discloses a UV LED photoinitiator preparation method, which comprises: (1) dissolving a carbazole derivative in an organic solvent, adding an inorganic alkali, stirring, adding a bromo-alkenyl derivative, completely reacting, carrying out a quenching reaction, and purifying to obtain a product 1; (2) dissolving the product 1 in the step (1) in an organic solvent, adding into 2, 4, 6-trimethylbenzoyl ethyl phosphonate, dropwise adding p-cresol, and stirring; performing reflux reaction and purification to obtain a product 2; (3) dissolving the product 2 in the step (2) and methyltriphenylphosphonium bromide in N, N-dimethylformamide, stirring and reacting, and purifying to obtain a product 3; and (4) dissolving the product 3 in the step (3) in an organic solvent, adding zinc trichloride, stirring for reaction, and purifying to obtain the UV LED photoinitiator. The compound is used for a UV-LED photocuring coating and has the advantages of being low in migration rate, high in initiation rate, easy to dissolve and the like, and the synthesis method is high in yield.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a preparation method of a UV LED photoinitiator. Background technique [0002] At present, the photoinitiators used by people in order to cooperate with UV-LED light sources are generally several combinations of traditional aminoketones, acylphosphoryl oxides, thioxanthones, and tertiary amine co-initiators; patent CN102532967 discloses a UV- -The paint cured by LED light source, its components mainly include mercapto-modified acrylic resin, monomer, photoinitiator TPO, active amine co-initiator and corresponding auxiliary agents and pigments; patent CN102863848 discloses a class of UV-LED curing Ink formula, the ink is suitable for graphic printing on lithographic printing machines, letterpress printing machines and flexographic printing machines. The photoinitiators used include: 369, TPO, TEPO, 907 and PBZ, etc., with a large amount (15% to 20 %); patent CN103396689...

AI Technical Summary

Problems solved by technology

[0002] At present, the photoinitiators used by people in order to cooperate with UV-LED light sources are generally several combinations of traditional aminoketones, acylphosphoryl oxides, thioxanthones, and tertiary amine co-initiators; patent CN102532967 discloses a UV- -The paint cured by LED light source, its components mainly include mercapto-modified acrylic resin, monomer, photoinitiator TPO, active amine co-initiator and corresponding auxiliary agents and pigments; patent CN102863848 discloses a class of UV-LED curing Ink formula, the ink is suitable for graphic printing on lithographic printing machines, letterpress printing machines and flexographic printing machines. The photoinitiators used include: 369, TPO, TEPO, 907 and PBZ, etc., with a large amount (15% to 20 %); patent CN103396689 discloses a UV-LED light-curing coating, the components include 30-65% acrylate oligomers, 20-50% monomers, 2-8% photoinitiators, etc., the composition For thick film coatings, the photoinitiators used include ITX, DETX, TPO and combinations thereof; patent CN102719143 discloses an outdoor screen printing ink composition cured by UV-LED surface light source, wherein the combination of photoinitiators is: Initiator 819, TPO, ITX, EDB combination, the proportion of each initiator component is 2 to 4%; although the current formula design can barely meet the requirements of UV-LED light source, the general amount of photoinitiator is large , causing cost pressure, if the amount of photoinitiator is reduced, the curing effect is not ideal; therefore, it is necessary to propose a preparation method of UV LED photoinitiator to at least partly solve the problems existing in the prior art

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