Oxime ester photoinitiator with donor-acceptor structure, preparation method and application thereof

By designing oxime ester photoinitiators with large conjugated donor-acceptor structures, the problem of low initiation efficiency of existing photoinitiators under visible light/sunlight is solved, and a high-efficiency, ultra-low addition deep curing effect is achieved.

CN120441475BActive Publication Date: 2025-09-26CHINA THREE GORGES UNIV
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Patent Information

Application Number
CN202510942004.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-09
Publication Date
2025-09-26
Estimated Expiration
2045-07-09

AI Technical Summary

Technical Problem

Existing photoinitiators have low initiation efficiency under visible light/sunlight, require large addition amounts, and have insufficient curing depth, leading to changes in material properties and uneven curing.

Method used

The oxime ester photoinitiator with a large conjugated donor-acceptor structure is designed with triphenylamine as the donor and bispyridinium salt as the acceptor to increase the photosensitivity and red-shift the absorption wavelength of the photoinitiator to the visible light region. The strong electron-withdrawing effect of the bispyridinium salt is utilized to reduce the oxime ester cleavage energy and enhance the photoinitiation activity.

Benefits of technology

It achieves visible light/sunlight initiation with high initiation efficiency, ultra-low addition amount, and deep curing capability, making it suitable for photopolymerization reactions in different complex environments.

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Abstract

The present invention discloses a preparation method and application of an oxime ester photoinitiator having a donor-acceptor structure. The preparation method constructs a large conjugated donor-acceptor structure oxime ester photoinitiator with triphenylamine as a donor, pyridinium salt as an acceptor, and oxime ester as a photoinitiator group through reactions such as Suzuki coupling, hydroxylation, oxime esterification, and salt formation. The photoinitiator can be used in photocuring systems such as coatings, inks, and 3D printing. It has high photoinitiation efficiency under both visible light and sunlight, and can meet the requirements of deep curing in different complex environments. The photoinitiator has the advantages of high initiation efficiency, ultra-low addition amount, and deep curing depth. The preparation process is simple, the raw materials are easily available, and large-scale industrial production can be achieved.
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