Single-component long-wavelength photoinitiators and preparation method thereof

Abstract

The invention discloses single-component long-wavelength photoinitiators, and relates to the field of photocurable materials. Photoinitiators are synthesized by a Claisen-Schmidt reaction, alpha-H-free aldehyde participating in the reaction comprises a carbazole derivative, and the carbazolyl group enhances the conjugation of the molecular structure of the photoinitiators to lengthen the maximum absorption wavelength of the synthesized products. The initiators have a good solubility in most photopolymerizable monomers, have an ultraviolet absorption peak matched with a corresponding LED lightsource, and can initiate polymerization of various monomers and achieve a good curing effect under the illumination of the LED light source. The invention also discloses a preparation method of the single-component long-wavelength photoinitiators. The preparation method has the advantages of simple conditions and mild conditions.

Description

technical field

[0001] The invention relates to the field of photocurable materials, in particular to a single-component long-wavelength photoinitiator and a preparation method thereof. Background technique

[0002] Photoinitiator is a key component of photocurable materials, which plays a decisive role in the photocuring speed of photocurable materials. A photoinitiator is a substance that can absorb radiation energy, undergo photochemical changes after being excited, and produce active intermediates (free radicals or cations) with the ability to initiate polymerization.

[0003] Photoinitiators can be divided into ultraviolet photoinitiators (absorbing ultraviolet light region 250-420nm) and visible light initiators (absorbing visible light region 400-700nm) due to the difference in absorbing radiation energy. Photoinitiators can be divided into two categories: free radical photoinitiators and cationic photoinitiators due to the different active intermediates produced. F...

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