Hydrophilic high-molecular polymer photosensitive initiator and preparation method thereof

Abstract

The invention discloses a hydrophilic high-molecular polymer photosensitive initiator, and a preparation method thereof. A repeating structure unit of the hydrophilic high-molecular polymer photosensitive initiator is represented by a formula in the specification, and in the formula, m is 50 to 1000, n is 50 to 1000, R' is selected from hydrogen or alkyl or hydroxyalkyl containing two-four carbonatoms. The photosensitive initiator is an acrylate-4-vinylphenyl-bis(2,4,6-trimethylbenzene benzoyl)phosphine oxide copolymer. The acrylate-4-vinylphenyl-bis(2,4,6-trimethylbenzene benzoyl)phosphine oxide copolymer prepared in the invention has a good hydrophilism which allows the storage stability to be improved, has a macromolecular structure which allows no chemical migration after film forming to be achieved and residual smell of the film to be reduced, and enables the cost to be reduced.

Description

technical field [0001] The invention relates to a photoinitiator, in particular to a hydrophilic macromolecular polymer photoinitiator and a preparation method thereof. Background technique [0002] Since 1946, a company in the United States first published the patent of unsaturated polyester / styrene ultraviolet light UV curing technology. , paper glazing and other industrial fields have been widely used, and light curing technology has maintained rapid development. UV-curable coatings have been greatly developed on wood, and the main advantages include: First, the drying speed is fast. After the UV coating is applied, it only needs a few seconds of ultraviolet light to form a film in an instant. Second, one-time film thickness. UV coatings can be made with 100% solid content, which improves production efficiency. Third, lower volatile organic components (VOC), more environmentally friendly than traditional solvent-based coatings. However, due to the high toxicity of mo...

AI Technical Summary

Problems solved by technology

Bis(2,4,6-trimethylbenzoyl)-phenyl-phosphine oxide is a high-efficiency photoinitiator commonly used in water-based UV, but, due to its low molecular weight, it is easy to produce in the dry film after construction Migration, volatilization, and odor remain in the paint film for a long time; insufficient hydrophilicity causes the precipitation of the initiator after long-term storage, and the stability and compatibility of the water-based system affect the drying effect of the overall paint film

For water-based photo-curing systems, after long-term storage and film formation, small molecule photoinitiators are prone to volatilization and migration due to their poor compatibility with photo-curing systems and strong mobility. The polymerization initiation efficiency is low, and on the other hand, it will also lead to yellowing, odor and toxicity of the product, making it difficult to meet environmental protection requirements

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