Polymerizable macromolecule photoinitiator and preparation method thereof

Abstract

The present invention relates to a polymerizable macromolecule photoinitiator and a preparation method thereof. The preparation method comprises: adding 4-hydroxybenzophenone and a formaldehyde solution to a three-necked flask filled with an alkali adopted as a catalyst, carrying out heating stirring to a temperature of 95 DEG C, and carrying out a reaction for 2 hours; heating to a temperature of 150 DEG C, carrying out a reaction, and carrying out a reduced pressure suction filtration reaction for 20 minutes; cooling to a temperature of 105 DEG C after completing the reaction, and collecting the product; pouring the product into water to carry out precipitation, and carrying out suction filtration to obtain a benzophenone-containing macromolecule photoinitiator; dissolving the benzophenone-containing macromolecule photoinitiator in an organic solvent, and simultaneously adding the benzophenone-containing macromolecule photoinitiator and a tertiary amine to the three-necked flask to carry out stirring; dissolving acryloyl chloride in an organic solvent, and slowly adding the organic solvent containing the acryloyl chloride to the mixing solution in a dropwise manner, wherein thereaction temperature is 0-5 DEG C; after completing the addition, stirring for 3 hours at a room temperature, and standing overnight; carrying out suction filtration, washing and drying on the resulting solution; and carrying out rotary evaporation to remove the solvent to obtain the polymerizable macromolecule photoinitiator. The photoinitiator prepared by the preparation method of the present invention has characteristics of large molecular weight, relatively small mobility, self-polymerization, and the like.

Description

technical field [0001] The invention belongs to the field of photosensitive molecular materials, and in particular relates to a preparation method of a polymerizable macromolecular photoinitiator containing benzophenone. Background technique [0002] Photopolymerization (also known as photocuring) is irradiated by light (ultraviolet light or visible light) on light-sensitive compounds, causing a series of photophysical and photochemical reactions to generate active fragments, which in turn trigger liquid oligomers. (including monomer) polymerization, and finally the process of instantly converting the liquid coating into a solid polymer material. [0003] The photoinitiator is very important in the photopolymerization system. It is related to whether the oligomer and diluent can quickly change from liquid to solid when the formulation system is irradiated with light. With the continuous development of science and technology and the increasing emphasis on environmental prote...

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Problems solved by technology

[0005] Benzophenone photoinitiator is the most widely used free radical type photoinitiator, but its ultraviolet absorption is low, and initiation effect is poor (R.Liska, Journal of Polymer Science PartA: polymerchemistry, 2002 (40): 1504-1518)

[0006] The above methods have the following disadvantages: 1. The molecular weight of the initiator is relatively small, the mobility is large, and free small molecules are easily generated during photolysis; 2. The molecule does not contain double bonds and cannot be polymerized by itself.

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