Organic silicon modified polyurethane acrylate photocureable coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to an organic silicon modified polyurethane acrylate photocureable coating and a preparation method thereof, and aims to solve the problems that benzophenone photoinitiator has to be used in cooperation with an amine co-initiator to better play a role, the amine co-initiator has toxicity and carcinogenicity, and a cured film initiated by the amine co-initiator is prone to yellowing. The organic silicon modified polyurethane acrylate photocureable coating provided by the invention adopts dioxathiacyclopentane with double bonds on a side chain as a hydrogen donor of a benzophenone photoinitiator, so that the problems that an amine co-initiator has toxicity and carcinogenicity and is easy to cause yellowing of a cured film are effectively solved. Various properties of the obtained organic silicon modified polyurethane acrylate photocureable coating are the same as those of an amine co-initiator serving as a hydrogen donor of a benzophenone photoinitiator, and the organic silicon modified polyurethane acrylate photocureable coating has good room-temperature curing performance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a silicone-modified polyurethane acrylate light-curing coating and a preparation method thereof. Background technique [0002] The photoinitiator is a key component of the photocuring system, which is related to whether the formula system can quickly change from liquid to solid under light. According to the mechanism of action of the generated active free radicals, photoinitiators are mainly divided into two categories: cleavage photoinitiators or hydrogen abstraction photoinitiators. Among them, the hydrogen abstraction type photoinitiator is generally based on an aromatic ketone structure, which has a certain light-absorbing performance, and has a bimolecular interaction with the co-initiator in the excited state, captures the hydrogen on the co-initiator, generates active free radicals, and then initiates The monomers and oligomers are polymerized and cross-linked to obtain ...

AI Technical Summary

Problems solved by technology

Amine co-initiators are not only toxic and carcinogenic, but when used in conjunction with benzophenone-based photoinitiators, amine co-initiators are likely to react with oxidative substances to generate colored substances, which will deepen the chroma of the photocured film (produce Yellowing), the possible mechanism of yellowing is: in the photocuring process, the amine co-initiator reacts with a photoinitiator (such as a benzophenone photoinitiator) containing a large conjugated aryl ketone structure to generate a band There are higher conjugated structure products and aldehyde structures of chromophores, which cause yellowing of photocured films (Zhao Yufei, Nie Jun, He Yong. Synthesis of new amine co-initiators and their research on the yellowing properties of photocured films [J]. Radiation Research and Radiation Technology Journal, 2008 (05): 26-30.), which seriously restricts the application of benzophenone photoinitiators in the field of photocuring

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