Environmental friendly ink II in the hottest green

Environmental friendly ink in green printing (2)

(2) UV curing ink

UV curing (UV) ink refers to the ink that uses ultraviolet light of different wavelengths and energies to form a film and dry the ink under UV irradiation. Using different UV spectra, different energies can be generated to polymerize the monomers in different ink binders into polymers. Therefore, the color film of UV ink has good mechanical and chemical properties, and the structure can be repaired. The main reasons for the above phenomena of UV ink advantages 10 various signs on the experimental machine should be clear and durable: (1) no solvent; (2) Fast drying speed and less energy consumption; (3) Good gloss and bright colors; (4) Water resistance, solvent resistance, good wear resistance. Photoinitiator in UV ink is a compound that is easily excited by light. After absorbing light, it is excited into free radicals, and the energy is transferred to photosensitive molecules or photocrosslinking agents, so that UV ink can undergo light curing reaction. At present, UV ink has become a mature ink technology, and its pollutant emission is almost zero. According to statistics, the annual output of UV ink is about 16000 tons in Japan, 18000 tons in Europe and 19000 tons in North America. In addition to solvent-free, UV ink also has the advantages of not easy to paste, clear dots, bright and bright ink color, excellent chemical resistance, saving dosage and so on. According to statistics, the United States used 3500 tons of UV ink for flexographic printing in 2000

(3) water based UV ink

water based UV ink is a new research direction in the field of UV ink at present. The viscosity of prepolymer in ordinary UV ink is generally very high, which needs to be diluted with active diluent. At present, the diluent acrylate compounds have different degrees of skin irritation and toxicity. Therefore, while developing low viscosity prepolymers and low toxicity active diluents, another development direction is to study water-based UV inks, that is, using water and ethanol as diluents. At present, water-based UV ink has been successfully developed and applied in some printing. In addition, alcohol soluble ink, which mainly plays a role in flexographic printing, is also an ink with little public hazard. It is mainly used in the packaging and printing of food, drugs, beverages, tobacco and alcohol, and daily necessities in contact with human body

(4) biological ink

American scientists have long been committed to the study of a protein molecule called bacteriorhodopsin. Natural materials often exhibit complex functions that cannot be easily obtained by materials such as semiconductors. Bacteriorhodopsin is derived from an intense purple cell membrane that grows on a body called halophilus halophilus in saline marshes. Illuminating its protein can trigger a photochemical reaction circle. The principle is that the photochemical reaction circle transports protons along the channel surrounding the cell membrane. The purple of this cell membrane comes from the bacteriorhodopsin component called "optic membrane". Amino acids in cell membrane channels are firmly bound to the "optic membrane". In the dissolved state, the "optic membrane" does not bind to amino acid and is pale yellow. By alternately irradiating two groups of lasers with different wavelengths on this protein molecule, the protein molecule can be converted back and forth between the purple structure and the Yellow structure. It is this habit that inspires people to study and use it. It can be used as a photosensitive element in analog visual film, a memory element in prion based processing device or a memory element in optical computer. Its film can also change color according to the conversion of external electric field. In conventional bacteriorhodopsin, low contrast color changes from purple to blue will be formed under the action of different electric fields. However, the bacteriorhodopsin structure produced by a certain mutant will change from blue to light yellow under the action of strong electric field. A display plate can be made by clamping the protein film into a transparent plate with a large number of electrodes. Applying appropriate voltage to different parts of the film can "write" a page of manuscript or "insert" an image. Like ink, the image on bacteriorhodopsin display plate can also be seen in ordinary light. Moreover, the color change time can be accelerated to 200 μ m。 At present, the main difficulty faced by the whole research work is the need to use hundreds of volts of electric field to stimulate its color transformation. Researchers are making efforts to carry out research in this area, hoping to make breakthroughs

(5) new environmentally friendly ink "opis100"

Osaka printing ink company in Japan recently launched a new environmentally friendly ink "opis100", which is a sheet fed offset printing ink, which meets the green mark recognition standard revised by the Japan Environmental Association at the end of last year, and has the following characteristics: (1) it meets the newly revised green mark "lithographic ink V-2" standard; (2) Recognized by the American Soybean Association; (3) Comply with the environmental protection standards of Japan Printing Industry Federation; (4) Comply with GPN ordering guidelines; (5) It is 100% vegetable oil ink based on soybean oil; (6) VOC content is less than 1%; (7) Good stability and transferability on board; (8) The system has excellent control, high stability, stable and reliable operation, fast response, low noise, good friction resistance, gloss and hair color; (9) Good adaptability of fountain solution; (10) Easily biodegradable and deinking; (11) Excellent fusion with uv-op varnish and better gloss; (12) It also has excellent printability for double-sided 8-color machine

source: Chinese ink