Is printing ink toxic? This is the most concern of most printing workers. So is the printing ink toxic? In fact, the answer to this question cannot be generalized, because there are many kinds of printing. When the printing was not developed before, the printing ink used is generally toxic. Yes, for example, we often say flexographic printing, which used to be called flexographic printing, which is a toxic printing ink; however, the current printing is all about non-toxic, moving toward green printing, take flexographic printing, there are many now Enterprises have adopted water-based inks, which can be said to be non-toxic.
Causes of ink toxicity Printing inks are composed of pigments, binders and additives. It is used for printing on books, periodicals, packaging and decoration, architectural decoration, etc. With the increase in social demand, the variety and output of inks have also expanded and increased accordingly.
The United States is the world's largest ink producer and consumer, followed by Japan, Germany is third, and China ranks fourth. With the rapid development of China's national economy, the prosperity of the printing and packaging industry has driven the rapid growth of the ink manufacturing industry, which has made China rapidly rise to become one of the world's major ink manufacturing countries in the past ten years. The above speed continues to grow rapidly.
A major problem of ink toxicity lies in organic solvents, which account for 30% to 50% of the total ink, such as aromatic hydrocarbon solvents, mainly refers to toluene, xylene, polycyclic aromatic hydrocarbons and their derivatives. They will evaporate into the air with the drying of the ink, which not only pollutes the air, but also poses a threat to the health of printing workers. There is also a volatile organic compound (VOC), which has many types, such as alcohol, ester, ether, ketone, mineral oil and so on. Like the aromatic hydrocarbon solvent, it will evaporate as the ink dries, thereby polluting the air.
Another big problem of ink toxicity is pigments, which stand at 5% to 10% of humor, such as heavy metals in ink. Among them, the most contaminated situation should be paid attention to, because children often include toys with printed ink in their mouths, which is likely to be absorbed. Possibility of some heavy metals. Therefore, the heavy metal content of the ink first put forward requirements. Heavy metals are mainly derived from pigments and additives in inks. Although most of the inks have reduced the content of heavy metals, there are still people who use chrome yellow and chrome red to make inks.
The solution of ink toxicity is to solve the problem of ink toxicity. From a narrow perspective, it is to use green environmental protection ink.
To meet the requirements of environmental protection, the ink composition should be changed first, that is, the new type of ink should be formulated with environmentally friendly materials. At present, environmentally friendly 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 ink and solvent-based ink is that the solvent used is water instead of organic solvent, which significantly reduces VOC emissions, can prevent atmospheric pollution, does not affect human health, is not easy to burn, and has stable ink properties , Colorful, non-corrosive plate, simple operation, cheap price, good adhesion after printing, strong water resistance, fast drying, so it is especially suitable for packaging printing products such as food, beverages, pharmaceuticals, etc. It is recognized as an environmentally friendly printing material in the world. It is also the only ink approved by the American Food and Drug Association among all printing inks.
(2) Ultraviolet curing ink: Ultraviolet curing (UV) ink refers to the use of ultraviolet light of different wavelengths and energies to form ink and dry ink under ultraviolet irradiation. Using different ultraviolet spectra, different energy can be generated to polymerize monomers in different ink binders into polymers, so the color film of UV ink has good mechanical and chemical properties. The main advantages of UV ink are: (1) no solvent; (2) fast drying speed and low energy consumption; (3) good gloss and bright colors; (4) water resistance, solvent resistance and good wear resistance.
The photoinitiator in UV ink is a compound that is susceptible to light excitation. After absorbing the light, it is excited into free radicals, and the energy is transferred to the photosensitive molecules or photocrosslinking agent, so that the UV ink undergoes photocuring reaction. At present, UV ink has become a more mature ink technology, and its pollutant emissions are almost zero. In addition to being solvent-free, UV inks have the advantages of being difficult to paste, clear dots, bright and bright ink colors, excellent chemical resistance, and low consumption.
(3) Water-based UV ink: Water-based UV ink is the new research direction in the field of UV ink. The viscosity of the prepolymer in ordinary UV ink is generally very large, and it needs to be diluted with an active diluent. The currently used diluent acrylate compounds have varying degrees of skin irritation and toxicity, so while developing low viscosity prepolymers and low toxicity active diluents, another development direction is to study water-based UV inks, that is, water And ethanol as a diluent. At present, water-based UV ink has been successfully developed and applied in some printing.
In addition, the alcohol-soluble ink, which mainly plays a role in flexo printing, is also a kind of ink with little pollution. It is mainly used in food, medicine, beverages, tobacco and alcohol, and packaging and printing of daily necessities in contact with the human body.
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