Ultraviolet photo-curable ink is an environmentally friendly printing ink that has been rapidly developed in recent years. It is also called UV ink. This type of ink is dried by ultraviolet irradiation, which causes polymerization of the ink vehicle. It contains no volatile organic solvents and no solvent hazards. In order to eliminate the emission of solvent-based ink VOCs and meet the stringent requirements of air quality standards, the printing industry has gradually adopted UV ink technology to print products, so UV inks can quickly occupy a place in the market.
UV inks are also composed of pigments, binders, and auxiliary materials. However, the composition of its binder is different from that of traditional solvent inks.
From the comparison of the compositions of UV inks and solvent-based inks, UV inks, which cure instantly by UV irradiation, react with solvent-infiltrated papers and traditional solvent-based inks and solvents that dry after several hours of oxidative polymerization. In contrast to the evaporation of water and the drying of water-based ink that penetrates the paper, the other ingredients are different except for the same pigment. The main ingredients of its binders are photoinitiators, prepolymers and reactive monomers. The curing mechanism of the UV ink is that the photoinitiator in the ink is directly affected by ultraviolet light, and the initiator molecules undergo chemical rearrangement to form radicals, which in turn triggers the formation of chain polymerization of functional groups in the prepolymer and reactive monomers. Reaction, the formation of linear polymers, photochemical reaction products in the polymer chain photocrosslinking reaction occurs, the liquid component into a three-dimensional network of solid polymer, the final formation of a solid ink film, which is a Instant dry way.
At present, UV ink has become a more mature ink technology, and its pollutant emissions are almost zero. In addition to solvent-free, UV inks also have advantages such as fast drying speed, less paste, clear dots, bright and bright ink, excellent chemical resistance, and low usage. According to statistics, the annual output of UV inks is approximately 16,000 tons in Japan, approximately 18,000 tons in Europe and approximately 19,000 tons in North America. In China also widely used in offset printing, flexo printing, gravure printing, screen printing and inkjet printing.
Water-based UV inks are the new direction of UV ink research. Prepolymers in general UV inks are generally very viscous and need to be diluted with a reactive diluent. The currently used thinner acrylate compounds have different degrees of skin irritation and toxicity. Therefore, while developing low-viscosity prepolymers and low-toxic reactive diluents, another development direction is to study water-based UV inks, that is, water. Ethanol and other diluents can be used to achieve even lower VOC emissions. At present, water-based UV inks have been successfully developed and applied in some printing industries.
In addition, cationic UV-curing inks are also a promising prospect for the development of UV inks. Cationic photocurable system is free from oxygen inhibition and has better surface curability, less irritation to human skin, less internal stress after curing, small volume shrinkage, and good flexibility and adhesion, compared with free radical photocuring system. , Has become a hot topic of ink research and development.
UV inks are also composed of pigments, binders, and auxiliary materials. However, the composition of its binder is different from that of traditional solvent inks.
From the comparison of the compositions of UV inks and solvent-based inks, UV inks, which cure instantly by UV irradiation, react with solvent-infiltrated papers and traditional solvent-based inks and solvents that dry after several hours of oxidative polymerization. In contrast to the evaporation of water and the drying of water-based ink that penetrates the paper, the other ingredients are different except for the same pigment. The main ingredients of its binders are photoinitiators, prepolymers and reactive monomers. The curing mechanism of the UV ink is that the photoinitiator in the ink is directly affected by ultraviolet light, and the initiator molecules undergo chemical rearrangement to form radicals, which in turn triggers the formation of chain polymerization of functional groups in the prepolymer and reactive monomers. Reaction, the formation of linear polymers, photochemical reaction products in the polymer chain photocrosslinking reaction occurs, the liquid component into a three-dimensional network of solid polymer, the final formation of a solid ink film, which is a Instant dry way.
At present, UV ink has become a more mature ink technology, and its pollutant emissions are almost zero. In addition to solvent-free, UV inks also have advantages such as fast drying speed, less paste, clear dots, bright and bright ink, excellent chemical resistance, and low usage. According to statistics, the annual output of UV inks is approximately 16,000 tons in Japan, approximately 18,000 tons in Europe and approximately 19,000 tons in North America. In China also widely used in offset printing, flexo printing, gravure printing, screen printing and inkjet printing.
Water-based UV inks are the new direction of UV ink research. Prepolymers in general UV inks are generally very viscous and need to be diluted with a reactive diluent. The currently used thinner acrylate compounds have different degrees of skin irritation and toxicity. Therefore, while developing low-viscosity prepolymers and low-toxic reactive diluents, another development direction is to study water-based UV inks, that is, water. Ethanol and other diluents can be used to achieve even lower VOC emissions. At present, water-based UV inks have been successfully developed and applied in some printing industries.
In addition, cationic UV-curing inks are also a promising prospect for the development of UV inks. Cationic photocurable system is free from oxygen inhibition and has better surface curability, less irritation to human skin, less internal stress after curing, small volume shrinkage, and good flexibility and adhesion, compared with free radical photocuring system. , Has become a hot topic of ink research and development.
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