Characteristics of the most popular high-tech inks

The characteristics of several high-tech inks (2)

research shows that after the surface of nano semiconductor particles is chemically modified, the medium around the particles can strongly affect their optical properties, which is manifested by red shift or blue shift in the absorption spectrum. Experiments show that the light absorption edge of CdS nanoparticles has a significant 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, it can accelerate its curing speed, and eliminate the shrinkage and wrinkling of the ink film 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 added into the ink, the total weight of global marine plastics will exceed the total weight of fish in 2050, which can greatly improve the wear resistance of the ink film. 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 ~ 1 μ M ultrafine particles, with an estimated value of 1.9 billion yuan, 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 particles have their own light-emitting groups and may emit light by themselves, such as "－ n ≡ n -" nano particles. 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

now, there is a new type of ink - cationic ink. It increases the guarantee for improving the environmental protection and quality of flexographic printing. Compared with free radical system, cationic ink has the advantages of low volatility and low odor, which can be said to be a good environmental protection ink. The smell of free radical ink is a headache, which is harmful to the health of operators and the environment. Cationic inks (low volatile inks) have great advantages in this regard, and now they can even be applied to some food packaging industries. Cationic ink also has the advantage of being attached to the plastic sheet base. Cationic ink and coated light show particularly good adhesion to the electro luminescent treated substrate, which is the most critical of all advantages

compared with free radical ink, cationic ink has the characteristics of medium curing speed (which is slightly inferior to free radical ink), secondary curing (about 24 hours), no oxidation prevention, slight humidity effect, no shrinkage, excellent plastic adhesion, etc

although in terms of curing speed, free radical inks can be dried under high-speed printing, the curing speed of cationic inks is slightly behind. However, recent research and development show that the improved cationic ink can also adapt to m/minute printing

the advantage of secondary curing is that when the printed matter is output from the printing machine, the ink film looks as if it has been cured, but some parts still do not react (not dried out). Cationic curing technology can continue to react until most of these materials react. In contrast, free radical inks can only be completely dried after exposure under V light source, which is subject to administrative punishment by U1 enterprises. This process will lead to higher volatilization, especially for the unreacted low molecular weight components. The cured polymer usually has a high molecular weight and will not volatilize. The volatilization of volatile matter is also reflected in the extractable components. The content of extractable components is an increasingly important feature of testing food packaging systems. Especially as an analytical technology, the content of extractable components is one billionth, and even now it is being discussed that the content is one billionth as an indicator of the content of packaging products. Cationic ink has small shrinkage, so it has good adhesion characteristics. (to be continued) (Qi Cheng) (printing art)