Mono/bis-methyl cinnamate photoinitiators as well as preparation method and application thereof

Abstract

The invention relates to methyl cinnamate compounds in a formula (I), wherein each variable in the compounds in the formula (I) is defined in the description. The invention further relates to a methodfor preparing the methyl cinnamate compounds, including an esterification reaction of a compound in a formula (II) and a compound in a formula (III). The methyl cinnamate compounds can be used as photoinitiators, can absorb radiant heat in the range of 200-400 nm and have good stability and yellowing resistance; and more importantly, the initiators greatly solve the problems of foreign odors andhigh migration as compared with existing alpha-hydroxyketone photoinitiator, besides, the photoinitiators have ultraviolet (UV) absorption red shift to about 300-400 nm and are applicable to UV-LED light source curing. The invention also relates to application of mono / bis-methyl cinnamate compounds as photoinitiators.

Description

technical field

[0001] The invention relates to mono- or bis-cinnamic acid methyl ester compounds, which can be used as photoinitiators, and also relates to the preparation and application of the mono- or bis-cinnamic acid methyl ester compounds. Background technique

[0002] Photoinitiator, also known as photosensitizer or photocuring agent, is a kind of energy that can absorb a certain wavelength in the ultraviolet region (250-400nm) or visible region (400-600nm), and generate free radicals, cations, etc., thereby initiating monomer Polymerization crosslinks cured compounds. In the photocuring system, the photoinitiator generally accounts for 3-5%. Although the content is low, it is the key component and plays a decisive role in the photocuring speed. It is related to whether the oligomer and diluent can be quickly cross-linked and solidified when the formulation system is irradiated with light, thereby changing from liquid to solid. At present, photocuring technology ha...

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