Characteristics of several high-tech inks (2)
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Studies have shown that after chemical modification of the surface of nano-semiconductor particles, the medium surrounding the particles can strongly affect its optical properties, which is characterized by red-shift or blue-shift of 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 separately added to the yellow and cyan inks to form nano-inks, the purity can be improved. Copying and printing color prints with nano-inks with specific nanoparticles added will make the layers more rich, the tone will be more vivid, and the performance of image details will increase.
Nowadays, various components (such as resins, pigments, fillers, etc.) in the ink can be made into nano-scale raw materials by means of high technology. In this way, due to its high degree of fineness and good flow and lubricity, it can achieve better dispersion and stability, less pigment, high hiding power, good gloss, fine resin particle size, continuous film formation, uniform smoothness, The film is thin and the printed image is clearer. If used in a UV ink, the curing speed can be accelerated, and the shrinkage wrinkling of the ink film can be eliminated due to the fine uniform dispersion of the filler. In the glass-ceramic ink, if the inorganic raw material is composed of nano-scale fineness, it will save a lot of raw materials and print a finer, more beautiful and higher quality image. This has brought about a huge change in the ink manufacturing industry, so that instead of relying on chemical pigments, it chooses the appropriate volume of nanoparticles to present different colors. Because some substances are in the nanometer range, the particle size is different and the color is different, or different substances are different colors, such as TiO2, SiO2 is white in the nanoparticles, Cr2O3 is green, Fe2O3 is brown, and inorganic nanomaterials such as nano-Al2O3 have very Good fluidity, if added to the ink, can greatly improve the wear resistance of the ink film. The nano-scale carbon ink has electrical conductivity and has a good shielding effect against static electricity, preventing the electrical signal from being interfered by external static electricity. If it is added to the ink, it can be made into conductive ink, such as large-capacity integrated circuit, modern contact panel switch, etc. . In addition, in the conductive ink, if Ag is made of nanometer instead of micron Ag, 50% of Ag powder can be saved. This conductive ink can be directly printed on ceramics and metal. The ink film is thin and uniform and smooth, and the performance is very good. it is good. If the Cu and Ni materials are made of ultrafine particles of 0.1 to 1 μm, it can be used to replace the precious metals such as palladium and silver. Therefore, combining nanotechnology with anti-counterfeiting technology will open up another broad world of anti-counterfeiting inks.
In addition, some nanopowder particles themselves have luminescent groups and may emit light by themselves, such as "-N≡N-" nanoparticles. The printed matter printed with the ink added with such particles does not need external light source illumination, can be recognized by the human eye by self-illumination, can also achieve good effect for anti-counterfeiting printing; used for outdoor large-scale advertising inkjet or nighttime Reading graphic prints eliminates the need for external light sources, which not only saves energy, but also greatly facilitates users.
Since the nanoparticles have good surface wettability, they are adsorbed on the surface of the pigment particles in the ink, which can greatly improve the lipophilicity and wettability of the ink, and can ensure the stability of the entire ink dispersion, so that nanoparticles are added. Nano ink printing performance has been greatly improved. It is believed that with the further development of nanomaterial technology, there will be more nanomaterials with different characteristics that will be recognized and utilized by people.
In the electrophotographic copying, the magnetic nano-powder is used instead of the now widely used non-magnetic toner, thereby eliminating the need to add ferromagnetic particles as a carrier to the non-magnetic toner, thereby making a one-component copying developer, which can save Raw materials and can improve the quality of copying.
As for the source of nanomaterials. In fact, there are many methods for obtaining nanomaterials, such as high-temperature sintering (such as sintering of carbon nanotubes), precipitation, high-temperature dissolution, chemical vapor condensation, or modern plasma energy polymerization.
2. cationic ink
In recent years, photocuring (UV) technology in flexographic printing has played an important role in the printing of paper and film materials. UV technology has been developed from a narrow web of letterpress printing to the flexographic printing market. In offset printing, we also saw the advantages of the UV ink quick-drying system, which can shorten the printing cycle and reduce the workload. The most important feature of the UV curing system is that it improves printing stability (drying) and shortens the waiting time for oxidative drying during printing. In the past 10 years, UV printing has had a great impact on tradition, mainly in flexographic printing on plastic substrates.
Today, there are new ink-cation inks. It adds assurance to the environmental and quality of flexographic printing. Compared with the free radical system, the cationic ink has the advantages of low volatility and low odor, and can be said to be a good environmentally friendly ink. The smell of free radical inks is a headache, and it is harmful to the health of the operator and the environment. Cationic inks (low-volatility inks) have great advantages in this regard and can now be applied to some food packaging industries. Cationic inks also have the advantage of being attachable to a plastic substrate. Cationic inks and coated glazing exhibit particularly good adhesion to the treated substrates, which is the most critical of all the advantages.
Compared with free radical inks, cationic inks have medium curing speed (which is slightly inferior to free radical inks), can be re-cured (about 24 hours), no oxidation inhibition, slight humidity effect, no shrinkage, plastic attached Excellent characteristics such as sex.
Although the radical type ink can be dried under high speed printing in terms of curing speed, the curing speed of the cationic ink is slightly behind. However, recent research developments have shown that improved cationic inks can also be adapted to 150-200 m/min printing.
The benefit of secondary curing is that when the print is output from the press, the ink film appears to have solidified, but there is still some that does not react (not dried out). The cationic curing technique can continue the reaction until most of these materials react. In contrast, free radical inks can only be exposed to UV light sources to dry thoroughly. This process, in turn, leads to higher volatilization, especially if the unreacted low molecular weight component is more volatile. The cured polymer usually has a high molecular weight and generally does not volatilize, and the volatilization of volatiles is also reflected in the extractable components. The amount of extractable ingredients is an increasingly important feature of test food packaging systems. In particular, as an analytical technique, the extractable ingredient content is one part per billion, and even a content of one trillionth of a component is now being discussed as an indicator of the content of the package. The cationic ink has a small amount of shrinkage and thus has good adhesion characteristics.