Method and composition for realizing mercapto-alkyne deep photopolymerization

Abstract

The invention relates to a method and composition for realizing mercapto-alkyne deep photopolymerization. The composition is prepared from, by mass, 20-80 parts of photopolymerizable mercapto monomers, 20-80 parts of photopolymerizable alkyne monomers, 0.5-8 parts of free radical photoinitiator and 0.1-5 parts of up-conversion material. The composition can have a light clicking chemical reaction under the direct radiation of near infrared rays. By means of the method, the maximum depth of photopolymerization of a mercapto-alkyne system can reach 8 cm or above, the problem that deep photopolymerization is difficult in a traditional mercapto-alkyne system is broken through, and the application field of a photopolymerization technology is expanded.

Description

technical field [0001] The invention belongs to the technical field of photopolymerization materials, and in particular relates to a composition containing an up-conversion material capable of undergoing deep photopolymerization of mercapto-yne under the irradiation of near-infrared light. Background technique [0002] Because mercapto-alkyne photopolymerization combines many advantages of traditional click chemistry and photoinitiation processes, it has attracted extensive attention from researchers. At the same time, mercapto-yne photopolymerization is not sensitive to water, the polymerization network structure is regular, and the shrinkage rate is low. Compared with the mercapto-ene system, the mercapto-yne system has a higher cross-linking density and a higher sulfur content, which can significantly Increase the optical transparency of polymeric materials, so it has a wide range of applications in the fields of optical materials, coatings, adhesives, molecular devices, ...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the penetration of ordinary UV light in the polymerization process, and the internal shielding effect caused by the absorption of the photoinitiator in the system, the photopolymerization research on the mercapto-alkyne system is mostly limited to two-dimensional thin-layer materials. Achieving deep photopolymerization of mercapto-yne systems has been a challenge

[0003] The patent with the publication number CN105348414A provides a method for deep cationic photopolymerization. This invention adds an up-conversion material to the cationic system and obtains a cured sample with a depth of more than 5 cm, but only solves the problem of cationic deep photopolymerization; The patent with the publication number CN105330790A provides a method for free radical deep photopolymerization. This invention uses up-conversion materials to convert near-infrared light into ultraviolet or visible light to realize deep photopolymerization of free radical systems. The polymerization depth exceeds 10 cm. However, the photosensitive resins and monomers used are all acrylates, and the photopolymerization of the mercapto-yne system is not involved.

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