With the continuous improvement of printing quality requirements, higher requirements are also put on inks. 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 excellent print quality, but also meet various special needs such as environmental protection and anti-counterfeiting. Therefore, such as magnetic ink, fluorescent ink, photo-induced ink, temperature-induced ink, etc., so that the development of the printing industry jumped to a new height. The following is a brief introduction to the characteristics and uses of several high-tech special inks.

Nano ink

(1) Talking from the fineness and purity of ink

We know that the fineness and purity of ink have a great influence on the quality of printing. To print high-quality products, it is necessary to have fine and pure ink as guarantee. The fineness of the ink refers to the size of the pigment (including filler) particles in the ink and the uniformity of the pigment and filler distributed in the binder. It not only reflects the quality of the printed product, but also affects the durability of the printing plate. rate. The process practice shows that the screen printing of color printing products or the solid layout contains small negative characters and negative lines. The printing process is prone to paste-up, layout infection, and quality failures. If you do not check and analyze carefully, you may fall into misunderstandings. I thought that the consistency of the ink was uncomfortable, the viscosity was too large, the ink volume was too large, or the pressure was too large, and I made some wrong adjustments blindly. Who knows that it is caused by poor ink fineness. The fineness of the ink is directly related to the nature of the pigment and filler and the size of the particles. In general, inks made with inorganic pigments (excluding carbon black) have coarser particles. This has a great relationship with the ink rolling process. The more times the ink is ground during the rolling process, the more uniform it will be, the larger the contact surface of the pigment particles and the binder, the finer the ink particles, and the better and more stable the printing performance will be. Take the printed screen version as an example, there are many high- and mid-tone 1-4 dots on the layout. If the ratio of the ink particles to the area of ​​the dots is close, it is easy to make the dots empty or spread out, and even the dots are not smooth. The shortcomings of printing. Therefore, the higher the ink fineness, the more clear and full dots on the printed matter.

The fineness of the ink is low, the particles of the pigment are coarse, the coefficient of friction is large during printing, and the printing durability of the printing plate is low. It is also easy to produce paste and ink accumulation during printing, as well as uneven transmission and distribution of ink. The fineness of the ink can generally be judged by visual observation, that is, the surface scraped by the ink knife, if it shows a smooth and uniform visual effect, it means that the fineness of the ink is good; if the scraped surface appears small pieces If the rough layer is in the form of particles or particles, the fineness of the ink is poor. In addition, you can also use a piece of coated paper with a little ink layer, and then use another piece of paper to drag the ink layer, until the ink layer is dragged to a very thin layer, it is still very smooth, indicating that the ink is fine. If there are marks on the ink layer, it is obvious that the marks are caused by coarse particles of ink pigment and filler. Of course, the above is only based on empirical judgment, and the accuracy of judgment has certain limitations. To achieve standardized and data-based judgments, only by relying on the fineness meter to measure the size of the pigment particles can the fineness of the ink be detected more accurately. The method is: dilute the sample ink to a certain degree, put it in the deepest part of the fineness meter, and then use a scraper to move the groove (to maintain a uniform speed) to the shallowest place, and the ink can be seen on the scales on both sides of the groove The size of the particles can also be observed with a microscope to determine the size of the ink pigment particles.

(2) Characteristics of nano ink

Nanotechnology is an emerging scientific technology. Nanometer is a unit of length from 9m to 10m. The research object of this technology is mainly nanometer materials. Nanomaterials have now begun to penetrate various fields. In 1994, Massachusetts Xmx Corporation of the United States has successfully obtained a patent for the manufacture of nano-scale uniform particulate materials for inks. Because the nano metal particles can absorb all the light waves and make them appear black, they also have a scattering effect on the light. Therefore, using these characteristics, nano metal particles can be added to black ink to make nano ink 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 have shown that after the surface of nano-semiconductor particles is chemically modified, the medium around the particles can strongly affect their optical properties, manifested as red- or blue-shifted absorption spectra. The experiment proves that the light absorption edge of cds nanoparticles has a clear blue shift, and the absorption edge of tio2 nanoparticles shows a large redshift. According to this, if they are added to yellow and cyan inks to make nano inks, their purity can be improved. Using nano-ink with the addition of specific nano-particles to copy and print color prints, the layers will be richer, the tone will be more vivid, and the ability to express image details will also be greatly increased.

Now, with the help of high technology, various components in the ink (such as resins, pigments, fillers, etc.) can be made into nano-scale raw materials. In this way, due to its high fineness and good flow and lubricity, it can achieve better dispersion and stability, less pigment usage, high hiding power, good gloss, fine resin particle size, continuous film formation, uniform and smooth, The film is thin and the printed image is clearer. If used in uv ink, it can accelerate its curing speed, and at the same time eliminate the shrinkage and wrinkling phenomenon 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 material is composed of nanometer-level fineness, it will save a lot of raw materials and print more refined, beautiful and high-quality images. This has brought a huge change to the ink manufacturing industry, so that it does not rely on chemical pigments, but chooses the appropriate volume of nanoparticles to present different colors. Because some substances have different sizes and different colors when they are at the nanometer level, or different substances have different colors, such as tio2 and sio2, the nanoparticles are white, 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. Nano-scale carbon ink is conductive, has a good shielding effect on static electricity, and prevents electrical signals from being interfered by external static electricity. If it is added to ink, it can be made into conductive ink, such as large-capacity integrated circuits, modern contact panel switches, etc. . In addition, if the ag is made into nano-scale instead of micro-scale ag in conductive ink, 50% of ag powder can be saved. This conductive ink can be printed directly on ceramics and metals. The ink film layer is thin and uniform and smooth, and the performance is very good. it is good. If cu and ni materials are made into ultrafine particles of 0.1μm ～ 1μm, it can replace precious metals such as palladium and silver to conduct electricity. Therefore, combining nanotechnology with anti-counterfeiting technology will open up another vast world of anti-counterfeiting inks.

In addition, some nano-powder particles have their own luminescent groups and may emit light by themselves, such as "-n≡n-" nano-particles. Prints printed with this kind of particle ink do not need external light source to illuminate and can be recognized by the human eye. It can also be used for anti-counterfeiting printing; it can be used for outdoor large-scale advertising printing or nighttime Reading the graphic prints eliminates the need for external light sources, which not only saves energy but also greatly facilitates users.

Because 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 system. Nano-ink printing performance has been greatly improved. It is believed that with the further development of nanomaterial technology, more nanomaterials with different characteristics will be recognized and utilized by people.

In electrostatic copying, the use of magnetic nano-toner instead of the widely used non-magnetic toner can eliminate the need to add ferromagnetic particles as a carrier to the non-magnetic toner, and make a single-component copying developer, which can save Raw materials, and can improve copy quality.

As for the source of nanomaterials. In fact, there are many methods for obtaining nanomaterials, such as high-temperature sintering method (such as carbon nanotube sintering technology), precipitation method, high-temperature dissolution method, chemical vapor coagulation method or modern plasma energy polymerization method.

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