Nano Ink and Nano Varnish

First, nano ink
Since silica and titanium dioxide exhibit strong anti-ultraviolet light and catalytic properties at the nanometer scale, the nano-modified ink synthesized through special processing chemical reactions can generally increase its light fastness by 2-3 grades and heat resistance. And the attachment fastness has obviously improved. Nano inks are compatible with all aspects of performance. Many of the products (especially food) packaging and printing have very high requirements for sterilization, preservation, etc., while the traditional ink and packaging materials are a blank in this respect. Today, pure natural extrusion materials have been transformed by nanotechnology, coupled with the application of nano-ink printing, can exert an amazing bactericidal effect. Nanoparticles can be used instead of chemical pigments to make printing inks. The resulting inks are brightly colored, pure in color and non-toxic and tasteless. The application prospects of nano inks in offset printing, gravure printing and flexo printing to produce color cartons and cartons are very broad. In addition, the use of nano inks can also significantly improve the quality of printed products.

In prints (especially high-end color prints), product quality and ink fineness, purity have a great relationship. Only small, high purity inks can print high quality prints. Therefore, improving the ink purity and fineness is also an important part of the research of new inks. 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 the filler distributed in the binder. It not only affects the quality of printed products, but also affects the printing rate of printing plates. Process practice shows that color printing products with a net pattern printing or field layout contains a small Yin, Yin Yin printing process is easy to appear dirty quality problems, on the surface, may be considered ink consistency discomfort, viscosity is too large, Too much ink or too much pressure, in fact, the real reason is that the ink particles are too thick. The fineness of the ink has a direct relationship with the pigment, the nature of the filler and the size of the particles. In general, inks made with inorganic pigments (not including carbon black) have poor fineness and relatively coarse particles, which are closely related to the rolling process of the ink. The more the ink is ground during the rolling process, the more uniform it is, the greater the contact area between the pigment particles and the binder, the finer the ink particles, and the better and more stable the printing performance.

Obviously, the fineness of the ink is closely related to the quality of the printed matter. For example, in the case of a printed anilox version, there are no shortages of 1 to 40% of high-profile and intermediate tones on the layout, if the ratio of ink particles to the electronic area is closer However, it is easy to make outlets emptiness or spread, or even electronic printing defects. Therefore, the finer the ink, the clearer and fuller the dots on printed matter. In addition, the finer the ink, the greater its concentration, the stronger the coloring power, and the higher the product's print quality. The coarse particles of inks and pigments have a large coefficient of friction during the printing process, and the printability of the printing plate is low. In addition, coarse-grained inks are also prone to paste and ink deposits during printing, as well as uneven distribution of ink and ink. The fineness and purity of the ink are very sensitive to the quality of the printed matter. To print a high-quality product, it is necessary to have a fine, high-purity ink as a guarantee. Therefore, a correct understanding of the relationship between ink fineness, purity and print quality, deeper understanding of nano inks, and development of higher quality nano inks are of great significance to the printing industry.

Because nanomaterials refer to the material itself being ultra-small and ultra-fine. Based on the various characteristics of nanomaterials, applying it to the ink system will bring a huge boost to the ink industry. In 1994, the XMX Corporation of Massachusetts, USA, has successfully obtained a patent for the production of nano-sized homogeneous particulate raw materials for inks. Then, XMX prepared to design a commercial production system, using this patent, select the appropriate volume of nano-particle raw materials to get a variety of ink pigments, and no longer rely on the old traditional production of inks required chemical pigments. According to another report, the nanoscale transparent iron oxide series pigments that have recently been awarded as national key new products by the Ministry of Science and Technology have been successfully developed. It will have an important impact on the upgrading of traditional pigments, mainly used in nano-ink, nano-water coating materials. The typical acicular particle size of the material, the long axis is 45 nanometers, the short axis is 6-7 nanometers, has good dispersion, crystallinity and weather resistance, high brightness and strong coloring characteristics. Its successful development has great significance for the replacement of traditional pigments in our country. It can be used especially for the production of nano-inks, which will greatly improve the quality of inks.

Because the absorption of light waves by nano-metal particles is different from ordinary materials, nano-metal particles can absorb all light waves and make themselves appear black. At the same time, in addition to the absorption of light, nano-metal particles also have a scattering effect on light. Therefore, by using these characteristics of the nano-metal particles, the nano-metal particles can be added to the black ink to create a nano-black ink, which can greatly improve the purity and density of the black ink. In addition, due to the existence of significant quantum size effects and surface effects, semiconducting nanoparticles exhibit a certain characteristic of light absorption. Studies have shown that after chemical modification of the surface of nano-semiconductor particles, the surrounding medium of the particles can strongly influence the optical properties, showing a red-shift or blue-shift of the absorption spectrum. Experiments have shown that the light-absorbing edge of the Cds nanoparticles has a clear blue shift. The absorption edge of TiO2 nanoparticles appeared a large red shift. Accordingly, if they are separately added to the yellow ink and the cyan ink to make the nano ink, the purity of the yellow ink and the cyan ink can be greatly increased. The use of nanometer inks with specific nano-particles to reproduce printed color prints can make the print layers richer, the tone more pronounced, and greatly enhance the ability to represent image details, so that high quality prints can be obtained.

Today, with the help of high technology, various components (inks, pigments, fillers, etc.) in ink can be made into nano-scale raw materials, so that they can achieve better flow and lubricity due to their high degree of fineness and good lubrication. The dispersion and suspension are stable, and the amount of pigment is small, but the hiding power is high, the gloss is good, the resin particle size is fine, the film formation is continuous, the light is uniform, and the film is thin, so that the printed image is clear. If used in UV ink, it may cause faster Solidification speed, at the same time eliminate shrinkage and wrinkling of the ink film due to the fine and uniform dispersion of the filler. In glass-ceramic inks, if the inorganic material is nanometer-sized, it will save a lot of raw materials and print more beautiful images. A huge change has been made in pigments for the ink manufacturing industry. It no longer depends on chemical pigments, but rather selects the appropriate volume of nanoparticles to present different colors. Because some substances are in the nanometer scale, different colors are different in particle size, or different materials have different colors. For example, TiO2 and SiO2 are white in the nanoparticles, Cr203 is green, and Fe203 is brown. Also, inorganic nanomaterials such as nano-Al2O3 have good fluidity, and if added to the ink, the abrasion resistance of the ink film can be greatly improved. Nanoscale carbon black is conductive, has a good shielding effect on static electricity, to prevent electric signals from being disturbed 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, in the conductive ink, such as the Ag made of nano-level instead of micron Ag, you can save 50% of Ag powder, this conductive ink can be directly printed on the ceramic and metal, the ink film is thin and uniform smooth, very good performance it is good. If the Cu, Ni material is made of 0.1 ~ 1μm ultrafine particles, it can replace palladium and silver and other precious metals conductive.

In addition, some nanopowder particles themselves have luminescent groups that can emit light themselves, such as "-N=N-" nanoparticles. These new nano-luminescent materials can emit light in the dark for more than 12 to 24 hours after a few minutes of illumination. Their luminous intensity and maintaining time are more than 30 times that of traditional fluorescent materials, and the material itself is non-toxic, harmless, free of Any radioactive element has excellent stability and weather resistance. Can be used endlessly. The printed matter printed with the ink added with such nanoparticles does not require the irradiation of an external light source, and can be recognized by the human eye only by its own light emission, and can be used for anti-counterfeiting printing to achieve a good first-line anti-counterfeiting effect. It is no longer necessary to use external light sources for outdoor large-scale advertising printing or night-stench printing. It not only saves energy, but also greatly facilitates users. Also, since nanoparticles have good surface wettability, they are adsorbed on the surface of the pigment particles in the ink, which can greatly improve the ink's lipophilicity and wettability, and can ensure the stability of the entire ink dispersion system. Nano-particle nano inks have greatly improved printability. It is believed that with the further development of nanomaterial technology, there will be more nanomaterials with different characteristics that will be recognized and used by people. Applying these nanomaterials to ink manufacturing, special inks with different uses can be obtained. The printing of confidential documents, the printing of various anti-counterfeit printings, and the printing of various handicrafts can all achieve exceptionally good results.

In practical verification of pigment nanocrystallization, the color appearance of nanometer pigments is far darker than that of submicron pigments. The main reason is that the particles of the pigments are large and the light will break through, and the light will scatter and emit light. Light penetrates through. The nanopigment has a small particle size, weak light scattering, a small spectral absorption area, and a light reflectance of less than 1%, so the appearance of the color is significantly deeper than the submicron pigment. Nano-pigmented pigments have a wide range of applications, such as ink-jet inks, coatings, inks, and optoelectronic displays. In the manufacturing process of products, the addition of 3% to 5% of nanopigment to improve the ink Shading rate, saturation, anti-rotation, water resistance and other issues. In addition, in ordinary and color laser printers, the thickness of the toner particles is an important factor that determines the quality of the output, and it is also a key to whether the resolution of the printer can be further improved. Therefore, using nanomaterials to make carbon powder for laser printing, especially color laser printing, can greatly improve the quality of the output. In addition, in the current color ink-jet printing, due to the ink problem, not only the print quality is affected, but also the occurrence of nozzle clogging and other failures from time to time, but once the nano-material ink is developed, it is believed that these problems can be well resolved. In addition, color laser printing and color inkjet printing are the major printing devices for future digital printing and on-demand printing. Nanotechnology will play an important role in this field.

Second, nano UV coating oil
Paper packaging products, surface gloss processing technology is gradually developed to the direction of UV curing UV coating, nano-UV polishing oil to color corrugated box with resistance to friction, scratch resistance, moisture, high gloss and other properties. Nano-UV coating oil is mainly composed of nano-oligomer (such as epoxy-acrylic acid, etc.), reactive diluent, photoinitiator and other additives. There are many methods for UV coating, such as coating and printing, and roller coating.

It can be expected that when continuously improving the nano high-tech in corrugated paper