Development of nano anti-counterfeiting ink
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1 Introduction
Anti-counterfeiting ink is one of the most important technical branches of anti-counterfeiting technology. It involves many disciplines, such as optics, chemistry, electromagnetics, computer technology, spectroscopy, printing technology, etc. It belongs to a cross-edge discipline. Among them, chemical anti-counterfeiting materials and technology are the basic technology of anti-counterfeiting inks, occupying a very important position in research and application. Manipulating molecules in the nanometer size range, designing and assembling stable multiple patterns, and thus creating new nano-fine chemicals and new nano-materials with excellent functions, has become a frontier field. How to cross-combine nanoscience and explore the application of nanomaterials in nano-fine chemicals, nano-medicine, nano-foods, nano-composites and new energy sources has become a research topic for scientists at home and abroad. The nano anti-counterfeiting printing ink developed by combining nanotechnology and anti-counterfeiting technology not only has good printing effect, but also can further improve anti-counterfeiting effect and anti-counterfeiting performance.
2. Characteristics of nano inks
The so-called nano anti-counterfeiting ink is a special printing ink which is added with special properties of nano anti-counterfeiting materials in the ink binder, and can also be processed by special techniques by means of encryption. Such as photochromism, thermochromic and ultraviolet ink, etc., or "nanocrystallization" of ink anti-counterfeiting, mainly has the following characteristics.
2.1 light fastness, acid resistance and adhesion are significantly improved. Nano ink compatible, all aspects of performance are extraordinary, because SiO2, TiO2 exhibits strong anti-ultraviolet light and catalytic performance at the nanometer scale, nano anti-counterfeiting ink synthesized by special chemical reaction process, its light fastness can generally be improved by 2~3 The grades, heat resistance and adhesion fastness are significantly improved.
2.2 Many common inks require the addition of a surfactant during the manufacturing process to reduce the surface tension of the binder, resulting in an increase in the affinity of the entire system. The nanoparticles themselves have good surface wettability. They adsorb on the surface of the pigment particles in the ink, which improves the lipophilicity and wettability of the ink, and stabilizes the solid and liquid structure of the ink. Therefore, it has been added. Nanoparticle inks can greatly improve their printability.
2.3 Replicating printed color prints with nano-inks with specific nano-particles added, the level will be more abundant, the tone will be more vivid, and the performance of image details will be greatly increased.
2.4 nanoparticle is 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.
2.5 The fineness of the ink is an important indicator to measure the quality of the ink. Since the various raw materials in the nano-ink are composed of nano-sized particles, the various particles are uniformly dispersed and suspended, resulting in extremely high ink fineness. Save a lot of raw materials and print more refined and beautiful images.
2.6 High-fineness nano-ink also has a significant advantage, that is, it enhances the printing durability of the printing plate. The printing plate is directly in contact with the ink, and the printing plate is mostly composed of a multi-layered metal plate with a low strength. If the ink particles are coarse, the friction coefficient is also inevitably large under the action of the printing cylinder, so that the printing plate is easily worn and the printing plate is damaged. Nano-inks with tiny particles and uniformity will not or reduce the occurrence of this situation.
3. Research status of nano inks
The luminescent pigment can be used as an additive and evenly distributed in various transparent media, such as ink, paint, plastic, rubber, paper, film, printing paste, ceramic glaze, glass, chemical fiber, leather, etc., to realize the self-illumination function of the medium. And can display the bright colors of this material. Its outstanding feature is that it has a strong absorption capacity for short-wave visible light with a wavelength of 450 nm or less. After absorbing and storing various visible light (daylight, fluorescence, ultraviolet light, light, etc.), it emits light in the dark for 12 to 24 hours, and its luminous intensity. And the maintenance time is more than 30 times that of the traditional fluorescent material, and the material itself is non-toxic, harmless, does not contain any radioactive elements, and has excellent stability and weather resistance. It can be recycled indefinitely. Since the nanocomposite can achieve molecular level compatibility and the size is smaller than the wavelength of light, the nanocomposite is relatively pure and the polymer has good transparency. The materials obtained by the sol-gel method are generally highly transparent. Fe2O3, V2O5 are selected as the inorganic component or the WO2 sheet inorganic material, and superconducting, photochromic, and electrochromic materials are obtained.
For example, in view of the poor light resistance of fluorescent anti-counterfeiting inks and the anti-counterfeiting mechanism that has been deciphered and lost the anti-counterfeiting function, Guangzhou University has successfully researched nano-anti-counterfeiting inks with near-infrared absorption, and the performance of small samples is reliable, safe, stable and resistant. Aging and other aspects have reached a satisfactory level. At present, the product has been applied to high-tech fields such as outer packaging, ticket security and infrared sensors.
There is also the anti-counterfeiting research group of Peking University. At present, it has successfully developed infrared anti-counterfeiting luminescent materials, infrared anti-counterfeiting inks, especially the infrared anti-counterfeiting laser discriminator, which has successfully developed the high-speed development of infrared anti-counterfeiting technology. The infrared luminescent material belongs to an inorganic rare earth luminescent material, and emits glare of bright green and red visible light under infrared illumination. The main working phase of the infrared material is 780 nm to 1200 nm. The advantages of this kind of luminescent material are: under normal daylight, it has a very white appearance, and it is easy to refine the granules, and is a special raw material for making anti-counterfeiting products. The intelligent anti-counterfeiting discriminator is a high-tech product that combines a new spectrum analysis technology with computer technology. Its excellent anti-counterfeiting performance and convenience of use can meet the needs of the highest level of anti-counterfeiting, and it is at the international leading level.
Nano-scale transparent iron oxide series pigments, which have recently been rated as national key new products by the Ministry of Science and Technology, have been successfully developed. The nano metal particles absorb all the light waves and make themselves black, and also scatter the light. Adding nano metal particles to the black ink improves the purity and density of the black ink. In addition, after the surface of the semiconductor nanoparticle is chemically modified, the medium surrounding the particle can strongly affect its optical properties, which is manifested by red shift or blue shift of the absorption spectrum. If they are added to yellow and cyan inks to make nano-inks, the purity of yellow ink and cyan ink can be increased, and the print layers can be more abundant.
The nano-scale carbon ink has electrical conductivity and has a good shielding effect against static electricity, preventing the telecommunication signal from being interfered by external static electricity. If it is added to the ink, it can be made into conductive ink for large-capacity integrated circuit and modern contact panel switch. Wait. 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, and the ink layer is even and smooth, and the performance is good. If the Cu and Ni materials are made into ultrafine particles of 0.1-1 um, it can be used to replace the precious metals such as palladium and silver.
4 Conclusion
Now, although nano-inks have made great progress, the advantages of nano-inks are obvious to all, but nano-inks are not very popular. At present, nano-inks are still basically in the pilot stage, and there is still a long way to go to the ink manufacturing and printing industries. With the development of nanotechnology, nano-ink will open up a vast new world for ink manufacturing, bringing a new revolution to the world's ink and printing technology.