Characteristics and applications of the hottest na

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Characteristics and uses of nano ink

with the continuous improvement of printing quality requirements, higher requirements are also put forward for ink. Today, with the rapid development of science and technology, various inks continue to appear and are used in general printing, special printing, anti-counterfeiting printing and other fields. They not only require good print quality, but also meet a variety of special needs such as environmental protection, anti-counterfeiting and so on. Therefore, the emergence of magnetic inks, fluorescent inks, photochromic inks, thermotropic inks and so on has made the development of the printing industry leap to a new height. Next, we will briefly introduce the characteristics and uses of several high-tech special inks

nano ink

(1) from the ink fineness and purity

we know that the fineness and purity of ink have a great impact on the quality of printed matter. To print high-quality products, we must have fineness and pure height of ink as a guarantee. The fineness of ink refers to the size of pigment (including filler) particles in ink and the calculation standard of pigment and filler: GB 16776 (2) 005 gb/t 528 (1) 998 the evenness of cloth in binder, which not only reflects the quality of printing, but also affects the print resistance of printing plate. The process practice shows that the color printing products contain small negative words and lines in the pattern printing or field layout, which is prone to paste, layout infection and quality failure in the printing process. If you do not carefully check and analyze, you may fall into the wrong operation, thinking that the ink consistency is inappropriate, the viscosity is too large, the ink quantity is too large or the pressure is too large, and blindly make some wrong adjustments. But it was caused by poor ink fineness. The fineness of ink is directly related to the properties of pigments, fillers and the size of particles. Generally speaking, the ink made of inorganic pigments (excluding carbon black) has coarse particles. This has a lot to do with the rolling process of ink. The more times the ink is ground in the rolling process, the more uniform it will appear, the larger the contact surface between the pigment particles and the binder will be, the finer the ink particles will be, and the better and more stable its printing performance will be. Take the printing plate as an example, there are many high-profile and middle tone points on the plate. If the proportion of ink particles and dot area is close, it is easy to make dots empty or fluffy, and even the printing defect of rough dots appears. Therefore, the higher the fineness of the ink, the clearer and fuller the dots on the printed matter, and the more powerful it is to broaden the financing channels

due to the low fineness of the ink, the coarse particles of the pigment, the high friction coefficient in the printing process, the low printing resistance of the printing plate, and the phenomenon of plate pasting and ink accumulation, as well as the uneven ink transmission and distribution. Generally, the fineness of the ink can be judged by visual observation, that is, if the surface scraped by the ink knife shows a smooth and uniform visual effect, it indicates that the fineness of the ink is good; If there is a small or granular rough layer on the scraped surface, the fineness of the ink is poor. In addition, you can also use coated paper to dip a little ink layer, and then use another piece of paper to polish the ink layer. When the ink layer is dragged to a very thin layer, it is still very shiny, indicating that the ink fineness is good. If there are traces in the ink layer, it is obvious that the traces are caused by coarse particles of ink pigments and fillers. Of course, the above is only based on experience, and the accuracy of discrimination has certain limitations. In order to realize standardized and data-based judgment, only by relying on the fineness meter to measure the size of pigment particles, can we accurately detect the fineness of ink. The method is: dilute the sample ink to a certain extent, place it in the deepest part of the fineness meter, and then use a scraper to control the groove to move (keep a constant speed) to the shallowest place. The particle size of the ink can be seen at the scales on both sides of the groove, and the size of the ink pigment particles can also be observed with a microscope

(2) characteristics of nano ink

nanotechnology is a new science and technology. Nanometer is a unit of length, ranging from 9m to 10m. The research object of this technology is mainly nano materials. Nanomaterials have now begun to penetrate all fields. In 1994, Xmx, a Massachusetts company in the United States, successfully obtained a patent for nano-sized uniform particle raw materials used in the manufacture of inks. Because nano metal particles can absorb all light waves and make themselves appear black, they also scatter the light that needs to be adjusted according to the latest requirements of the standard. Therefore, using these characteristics, nano metal particles can be added to black ink to produce nano ink to improve its purity and density. In addition, semiconductor nanoparticles exhibit certain characteristics of light absorption due to the significant quantum size effect and surface effect

studies show that after chemical modification of the surface of nano semiconductor particles, the medium around the particles can strongly affect their optical properties, which is manifested by red shift or blue shift of the absorption spectrum. Experiments show that the absorption edge of CdS nanoparticles has obvious blue shift, and the absorption edge of TiO2 nanoparticles has a large red shift. Accordingly, if they are added to yellow and cyan inks respectively to make nano inks, their purity can be improved. Using nano ink with specific nano particles to copy and print color prints will enrich the layers, make the tones clearer, and greatly improve the performance of image details

nowadays, with the help of high and new technology, various components in ink (such as resin, pigment, filler, etc.) can be made into nano raw materials. In this way, because it is highly fine and has good flow and lubricity, it can achieve better dispersion, suspension and stability, less pigment consumption, high hiding power, good gloss, fine resin particle size, continuous film formation, uniform and smooth, thin film, and clearer printing image. If used in UV ink, the curing speed can be accelerated, and the shrinkage and wrinkling of the ink film can be eliminated due to the fine and uniform dispersion of the filler. In the printing ink of glass ceramics, if the inorganic raw materials are composed of nano fineness, it will save a lot of raw materials and print more refined, beautiful and high-quality images. This has brought a great change to the ink manufacturing industry, so that it no longer depends on chemical pigments, but selects nanoparticles of appropriate volume to present different colors. Because some substances have different particle sizes and colors at the nano level, or different substances have different colors, such as TiO2 and SiO2 in the nano particles are white, Cr2O3 is green, Fe2O3 is brown, and inorganic nano materials such as nano Al2O3 have good fluidity. If they are added to the ink, the wear resistance of the ink film can be greatly improved. Nano carbon ink has conductivity, which has a good shielding effect on static electricity and prevents electrical signals from being interfered by external static electricity. If it is added to the ink, it can be made into conductive ink, such as high-capacity integrated circuits, modern contact panel switches, etc. In addition, if AG is made into nano scale instead of micron scale Ag in conductive ink, 50% of Ag powder can be saved. This conductive ink can be directly printed on ceramics and metals. The ink film is thin, uniform and smooth, and has good performance. If Cu and Ni materials are made into 0.1 M ~ 1 m ultrafine particles, it can replace precious metals such as palladium and silver to conduct electricity. Therefore, the combination of nanotechnology and anti-counterfeiting technology will open up another broad world of anti-counterfeiting ink

in addition, some nano powder particles have their own light-emitting groups and may emit light by themselves, such as the particles after the end of the "- N, N -" nano micro activity. The printed matter printed with the ink with such particles does not need the irradiation of external light sources, and can be recognized by the human eye by its own light, which can also achieve good results for anti-counterfeiting printing; For large-scale outdoor advertising spray painting or night reading graphic printing, there is no need for external light sources, which can not only save energy, but also greatly facilitate users

because nanoparticles have good surface wettability, they adsorb on the surface of pigment particles in the ink, which can greatly improve the lipophilicity and wettability of the ink, and ensure the stability of the whole ink dispersion system, so the printability of nano ink with nanoparticles has been greatly improved. It is believed that with the further development of nano material technology, more nano materials with different characteristics will be known and used by people

in electrostatic copying, replacing the widely used non-magnetic toner with magnetic nano toner can eliminate the need to add ferromagnetic particles into the non-magnetic toner as a carrier, and make a single component copy developer, which can save raw materials and improve the copy quality

as for the source of nano materials. In fact, there are many methods to obtain nano materials, including high-temperature sintering (such as the sintering technology of carbon nanotubes), precipitation, high-temperature dissolution, chemical vapor condensation or modern plasma energy polymerization

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