Copolymerized macromolecular photoinitiator and preparation method thereof

Abstract

The invention relates to a copolymerized macromolecular photoinitiator and a preparation method thereof. The method comprises the following steps: carrying out copolymerization reaction on a monomer A, a monomer M' and a monomer L', wherein the monomer A is 4-acryloyloxy benzophenone or 4-methacryloyloxy benzophenone, M' is styrene and a derivative thereof, acrylic acid and a derivative thereof, methacrylic acid and a derivative thereof or styrene, L' is maleic anhydride, glycidyl acrylate or glycidyl methacrylate, the structural formula of the prepared copolymerized macromolecular photoinitiator is shown in the specification, R is a hydrogen atom or methyl, M is a styrene unit, an acrylic acid unit, a methacrylic acid unit, a styrene derivative unit, an acrylic acid derivative or a methacrylic acid derivative unit, L is a maleic anhydride unit, a glycidyl acrylate unit or a glycidyl methacrylate unit, x / (x + y + z) is 0.01 to 0.95, and z / (x + y + z) is 0.01 to 0.50. The method disclosed by the invention is simple in process, and the prepared photoinitiator has the advantages of high photoinitiation activity and good thermal stability.

Description

technical field [0001] The invention belongs to the technical field of photoinitiators, and relates to a copolymerized polymer photoinitiator and a preparation method thereof. Background technique [0002] UV curing technology refers to a photoprocessing process in which the liquid resin matrix is ​​rapidly cross-linked into a solid state by the decomposition of a photoinitiator by ultraviolet light of a certain wavelength. The photocuring reaction is essentially a photoinitiated polymerization and crosslinking reaction. The advantages of light curing technology are fast reaction rate, short processing cycle, high efficiency, energy saving and environmental protection, and cost saving. The current photocuring technology is mainly used in the preparation of photocurable coatings, photocurable inks, photocurable protective sleeves, photocurable adhesives, 3D printing and other fields. [0003] Photoinitiator is the core factor of photocuring system. Photoinitiator refers to...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the low thermal stability of existing small molecule and macromolecular photoinitiators, the compatibility with high molecular weight resins is not good, and when used for crosslinking modification of these high molecular weight resins, the initiation effect is not good and the degree of crosslinking is not good. High and non-uniform problems, the present invention provides a copolymerization polymer photoinitiator and its preparation method; it is to make the photoinitiator high molecular weight, especially when the molecular weight is increased to higher than 1050, in the application of high molecular weight resin modification, Especially in the process of high-temperature melt molding, the photoinitiator does not volatilize, does not produce peculiar smell, and has good thermal stability; in addition, those skilled in the art often think that high molecular weight will lead to a decrease in the initiation efficiency of the photoinitiator, but the present invention unexpectedly finds that in the copolymerization After introducing maleic anhydride units, glycidyl acrylate units or glycidyl methacrylate units into the polymer photoinitiator, the copolymerized polymer photoinitiator shows a ratio of small molecules through its uniform dispersion in the high molecular weight resin. Photoinitiator comparable or even higher crosslinking effect

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