My opinion on nano ink
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With the continuous development of science and technology, the words "nano" and the "nanotechnology" and "nanomaterials" derived from it frequently appear in everyone's daily life. The impact of nanotechnology on people's thoughts and scientific and technological progress It has affected the industry to a large extent, and the nanotechnology caused by it has been applied in many industries such as rubber, plastics, glass steel, paints, ceramics, adhesives, sealants, polishing pastes, medicine, metallurgy, printing, etc. widely.
Since 1994, XMX Corporation of Massachusetts, USA has successfully applied nano-scale uniform particles for ink manufacturing.
After the patent of raw materials, nanotechnology has caused waves in the ink field. The ink is a stable coarse dispersion composed of a pigment as a dispersed phase and a binder as a continuous phase. So, what is nano-ink? We add nano-particles into the ink, or make the raw materials for making ink (such as resin, pigment, filler, binder, etc.) into nanometer size, so that the ink produced is nano-ink. . Nano inks have many advantages that ordinary inks can't match, which has brought tremendous changes to the ink industry.
Let us first look at the advantages of using inks made from nanoscale materials. We know that 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 overall 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.
As we all know, the fineness of ink is an important indicator to measure the quality of ink. The process practice shows that high-fineness ink has strong tinting strength, high gloss, high gloss part and clear and full print; low-fineness ink will cause a lot of printing. Failures, such as lithography, stacking, paste, etc. in lithographic printing; solvent-based inks can cause smashing, ink settling, and the like. In general, the higher the printed network cable, the higher the fineness required for the ink. In the printing process, we often encounter high-profile 1 to 4 mesh points on the layout. At this time, the advantages of nano-ink are unobstructed. Since various raw materials in nano inks are composed of nano-sized particles, the fluidity and wettability are greatly increased compared with ordinary inks, and various particles are uniformly dispersed and suspended, resulting in extremely high ink fineness and easy The drawbacks encountered by the above conventional inks that cannot be overcome are largely avoided.
The high-fineness nano-ink also has a significant advantage, which is to enhance the printing durability of the printing plate. As we all know, the printing plate is directly in contact with the ink, and the printing plate is mostly a multi-layer metal with a very low strength. The composition of the plate, if the ink particles are coarse, under the action of the printing cylinder, the friction coefficient is also inevitably large, so that the printing plate is easily worn. Causes damage to the plate. Nano-inks with tiny particles and uniformity will not or reduce the occurrence of this situation.
Then, what are the advantages of adding nanoparticles to the ink? The nanoparticles added to the ink may be metal particles and oxide particles thereof, or non-metal particles; they may be organic particles or inorganic particles. The characteristics of the ink formed are different when the added particles are different. For example, nano metal particles, which absorb light waves differently from ordinary materials, can absorb light of various wavelengths to make themselves appear black, and also have scattering effect on light. Therefore, metal nanoparticles are added. The ink has a higher purity and density. For example, CdS nanoparticles and TiO2 nanoparticles, which are semiconductor particles, have chemically modified surfaces, and the medium surrounding the particles can strongly affect their chemical properties. The former shows a clear blue shift phenomenon on the light absorption side, and the latter shows a significant red shift phenomenon on the light absorption side. Therefore, adding them to the yellow ink and the cyan ink separately to form the nano ink can enhance The expressive power of yellow and cyan makes the prints richer and more vivid, greatly enhancing the detail of the image. There are also some substances, when they are in the nano-scale, they will have different colors. For example, Cr2O3 is green and Fe2O3 is brown. Therefore, we do not rely solely on chemical pigments to express the color of the ink. Replace specific nanoparticles. For example, particles such as SiO2 and TiO2 exhibit strong UV resistance and catalytic resistance at the nanometer level, which makes the nano-inks to which they are added significantly enhanced in aging resistance and sun resistance, and because of themselves It is very small, much larger than the surface (50% of the surface area of the particles of 5nm, and the percentage of the surface area of the particles of 2nm is increased to 80%). When the ink is dry, the network structure can be quickly formed, which increases the strength and smoothness of the ink. Some of the microparticles themselves have luminescent groups that are capable of illuminating after a short period of illumination, such as [-N≡N-] nanoparticles, the luminescence time and luminescence intensity of the ink to which the microparticles are added. It is more than 30 times of ordinary traditional fluorescent ink, and the material itself is non-toxic, harmless and non-polluting. It is convenient and practical for printed materials for night reading, so it is a very good special ink.
Due to the nature of the particles themselves, the properties of the inks produced after addition are also different. Adding conductive particles can shield static electricity and make conductive ink; adding particles with good fluidity can improve the wear resistance of the film. Nowadays, nano-inks are used in anti-counterfeiting printing. Their unique mechanism not only achieves good printing results, but also anti-counterfeiting effects and anti-counterfeiting properties are self-evident. Therefore, we can select the required nano inks for production according to the actual requirements, so that the printed products have unique properties.
Now, although nano-inks have been developed for more than a decade, the advantages of nano-inks are obvious to all, but nano-inks are not very popular. This is because nano inks still have some technical bottlenecks in the manufacturing process, such as nano-dispersion technology, which contains two problems, that is, the particles are pulverized to the nano-scale and the nano-scale ions are dispersed. Ball mills used to make conventional inks are difficult to grind raw materials to the nano-scale, and even if the nano-scale requirements are met, the particles are easily aggregated to form large particles due to the small size of the particles and the extremely high surface area. Therefore, we must develop new milling and dispersion technology to meet the requirements of raw material size, and study new nano-molecular coating technology to prevent its agglomeration.
Although there are many obstacles on the way forward, due to the irreplaceable advantages of nano inks, we will continue to explore on this road. We believe that in the future ink industry, nano inks will be the mainstream of leadership development.