To meet the environmental protection requirements of inks, we must first change the ink composition, that is, use environmentally friendly materials to formulate new inks. At present, environmental protection inks mainly include water-based inks, UV inks, water-based UV inks, and some alcohol-soluble inks.
(1) Water-based ink
The biggest difference between water-based inks and solvent-based inks is that the solvent used is water instead of organic solvents, which significantly reduces VOC emissions, prevents air pollution, does not affect human health, is not easy to burn, ink is stable, colorful, and does not corrode Plate material, simple operation, low price, good adhesion after printing, strong water resistance, rapid drying, it is especially suitable for food, beverages, pharmaceuticals and other packaging printed matter, is the world recognized environmental protection printing material, is also the current all printing ink The only ink approved by the U.S. Food and Drug Association.
(2) UV curable ink
UV-curable (UV) inks are inks that use ultraviolet light of different wavelengths and energies to form and dry inks under ultraviolet light. Utilizing different UV spectra, different energy can be generated, and monomers in different ink binders can be polymerized into polymers, so the UV ink film has good mechanical and chemical properties. The main advantages of UV inks are: (1) no solvent; (2) fast drying and low energy consumption; (3) good gloss and vivid colors; (4) water resistance, solvent resistance, and good abrasion resistance. Photoinitiators in UV inks are compounds that are susceptible to photoexcitation. After absorption of light, they are excited into free radicals and the energy is transferred to photosensitive molecules or photocrosslinkers, causing UV inks to undergo photocuring reactions. 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 the advantages of not being easy to paste, clear dots, bright and bright ink, excellent chemical resistance, and low dosage.
(3) Water-based UV ink
Water-based UV inks are currently 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. At present, water-based UV inks have been successfully developed and have been used in some printing applications. In addition, alcohol-soluble inks, which mainly play a role in flexo printing, are also very small-pollution inks. They are mainly used in food, medicines, beverages, tobacco, and daily-use packaging and printing that are in contact with the human body.
(1) Water-based ink
The biggest difference between water-based inks and solvent-based inks is that the solvent used is water instead of organic solvents, which significantly reduces VOC emissions, prevents air pollution, does not affect human health, is not easy to burn, ink is stable, colorful, and does not corrode Plate material, simple operation, low price, good adhesion after printing, strong water resistance, rapid drying, it is especially suitable for food, beverages, pharmaceuticals and other packaging printed matter, is the world recognized environmental protection printing material, is also the current all printing ink The only ink approved by the U.S. Food and Drug Association.
(2) UV curable ink
UV-curable (UV) inks are inks that use ultraviolet light of different wavelengths and energies to form and dry inks under ultraviolet light. Utilizing different UV spectra, different energy can be generated, and monomers in different ink binders can be polymerized into polymers, so the UV ink film has good mechanical and chemical properties. The main advantages of UV inks are: (1) no solvent; (2) fast drying and low energy consumption; (3) good gloss and vivid colors; (4) water resistance, solvent resistance, and good abrasion resistance. Photoinitiators in UV inks are compounds that are susceptible to photoexcitation. After absorption of light, they are excited into free radicals and the energy is transferred to photosensitive molecules or photocrosslinkers, causing UV inks to undergo photocuring reactions. 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 the advantages of not being easy to paste, clear dots, bright and bright ink, excellent chemical resistance, and low dosage.
(3) Water-based UV ink
Water-based UV inks are currently 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. At present, water-based UV inks have been successfully developed and have been used in some printing applications. In addition, alcohol-soluble inks, which mainly play a role in flexo printing, are also very small-pollution inks. They are mainly used in food, medicines, beverages, tobacco, and daily-use packaging and printing that are in contact with the human body.
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