Macromolecular polymerizable photoinitiator and preparation thereof

Abstract

The invention discloses a macromolecular polymerizable photoinitiator and a preparation thereof. The method comprises the following steps of: adding 4-hydroxybenzophenone and methanal to a three-necked flask, heating to 95 DEG C, reacting for 2 hours, heating to 150DEG C, leaching under at reduced pressure for 20 minutes, cooling to 105 DEG C, collecting products, pouring products into water, leaching to obtain a macromolecular photoinitiator, dissolving the macromolecular photoinitiator in an organic solvent, dissolving epoxy chloropropane in the solvent under catalysis of boron trifluoride, dropwise adding mixed liquid, reacting at a temperature of 0-5 DEG C, then stirring for 3 hours at a temperature of 70 DEG C, removing epoxy chloropropane and solvent, dissolving residues with a solvent, adding alkali and reacting for 0.5 hour at a temperature of 40 DEG C, removing salt and the solvent, re-dissolving residues with a solvent, washing with water and drying, adding crylic acid, p-hydroxyanisole and tetrabutylammonium bromide, heating for reacting for 6 hours, and then removing the solvent so as to obtain macromolecular polymerizable photoinitiator. The macromolecular polymerizable photoinitiator prepared by the method has the advantages of large molecular weight, weak mobility and good polymerizability.

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] Light (ultraviolet or visible light) is irradiated on light-sensitive compounds, causing a series of photophysical and photochemical reactions to generate active fragments, which in turn trigger the polymerization of liquid oligomers (including monomers), and finally The process in which the liquid coating is instantly transformed into a solid polymer material is called photopolymerization (also known as photocuring). With the continuous development of science and technology and the increasing emphasis on environmental protection, photopolymerization technology has developed rapidly. Photopolymerization technology has practical application value in the fields of coatings, inks, adhesives, microelectronics, dental restoration and...

AI Technical Summary

Problems solved by technology

[0004] 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: polymer chemistry, 2002 (40) :1504-1518)

[0005] 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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