The hottest nanotechnology improves ink performanc

Nanotechnology improves ink performance

ink is the key factor of printing. The performance of ink in all aspects will affect the quality of printed matter. Improving ink performance plays a very important role in improving printing reproduction effect. Nanotechnology is a new high-tech technology, which directly operates and arranges the motion characteristics of atoms and molecules, so as to transform the related properties of materials. It is of far-reaching significance to improve the performance of ink through nanotechnology, especially to improve the conductivity of ink by using nano graphite, so as to improve the printing reproduction effect

first, the development and performance of ink

China is the first country to use ink. Ink, as one of the material bases of printing, appeared 2000 years ago. It is internationally recognized that China was the first country to use ink in ancient civilization. It began to use ink as early as the Western Han Dynasty (200 BC). This kind of ink can write on bamboo and silk to transmit information, and some of its functions can be compared with contemporary ink

in the 15th century, Gutenberg in Germany invented lead alloy movable type printing, and the ink was improved. Light black was used as pigment, linseed oil was used as binder, and it was evenly mixed by hand to make the ink at that time. However, until the mid-19th century, the progress of science, especially chemistry, led to the development of coal tar dyes and color science. Ink manufacturers could produce various colors with different hues, lightness and saturation according to the needs of users. Ink production has entered a new stage of development

there are many kinds of inks with different physical properties. Some are very thick and sticky, while others are quite thin. Its composition can be divided into three parts: the liquid component is called binder; Solid components are pigments (pigments or dyes) and various additives. Printing ink is a paste colloid formed by evenly dispersing and mixing pigments, binders, fillers and other materials. Pigments give prints rich and colorful colors; The binder is used as the carrier of the pigment, and also as an adhesive to fix the pigment on the surface of the substrate; The filler endows the ink with appropriate properties, making the ink meet the printability of various printing processes

for inks, color, body bone (usually the rheological properties of inks such as dilute consistency and fluidity are called the body bone of inks) and drying performance are the three most important properties of inks, which should be paid attention to when developing ink formulas and processes and producing inks; The printing film on the print should have certain resistance to make the print have practical use

second, the concept of nano and its application

nano is the translation of English nano meter, which is a unit of measurement. L nano is one billionth of a meter, which is only as long as 45 atoms strung together. Nanostructures usually refer to micro structures with a size of less than 100 nm. Therefore, nanotechnology is actually a technology that uses single atom and molecular range materials, which means that people can produce extremely pure materials and rich new products. Nanotechnology can be divided into molecular nanotechnology, micromachining technology and Biological Nanotechnology. Nanotechnology has a wide range of connotations, including the manufacturing technology of nano materials, the technology used by nano materials in various fields, the construction of a device in the nano space to realize the cutting and operation of atoms and molecules, and the recognition of the new laws of material transmission and energy transmission in the nano micro region, etc. At present, the research and application of nanotechnology is also mainly in the field of nanoscale structural materials (i.e. nano materials). Nano materials refer to substances whose grain size is in the range of 1 ~ 100 nm. The research shows that when the material particles enter the nano scale particles, they have the characteristics of quantum size effect, small size effect, surface effect and macroscopic quantum tunneling effect. Nanoparticles have large specific surface area, surface atomic number, surface energy, etc., and their surface tension increases sharply with the decrease of particle size, resulting in the thermal, magnetic, photosensitive properties and surface stability of nanoparticles different from normal particles. Because the size of nanoparticles is close to the wavelength of light, and it has the special effect of large surface, its characteristics such as melting point, magnetism, optics, heat conduction and conductivity are different from those of the material in the overall state

third, the application of nanotechnology in ink

the application of nano materials to the ink system will bring great impetus to the ink industry. In 1994, Xmx, a Massachusetts company in the United States, successfully obtained a patent for nano-sized uniform particle raw materials used in the manufacture of inks. Then, Xmx company plans to design a commercial production system, and use this patent to select appropriate volume of nano powder raw materials to obtain various pigments of ink, instead of relying on the chemical pigments required by the old tradition to produce ink. It is also reported that the 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 also been successfully developed. The size of the typical needle like particles of the material is 45 nm long axis and 6 ~ 7 nm short axis. It has good dispersion, crystallinity, weather resistance, high brightness and strong coloring power. Its successful development is of great significance to the renewal of traditional pigments in China, especially for the production of nano ink, which greatly improves the quality of ink. At present, using nano graphite in ink, improving the conductivity of ink, making conductive ink, making high-capacity integrated circuits, modern contact panel switches, etc., will have great development potential

1. Nano graphite used in ink

① properties of nano graphite

carbon element is one of the most closely related and important elements in nature. It has a variety of electronic orbital properties (SP, SP2, SP3 hybrid), coupled with the anisotropy of SP2, which leads to the anisotropy of crystal and its arrangement. Therefore, carbon materials with carbon element as the only constituent element have various properties, and new carbon phases and new carbon materials are constantly discovered and artificially made. Due to the surface effect, small size effect, quantum effect and macro quantum tunnel effect of nano graphite, the goal of manufacturing power can be achieved, so that nano graphite materials have better physical chemistry, surface and interface properties than conventional bulk graphite materials. People make graphite into ultrafine nanoparticles and have a strong interest in its application research

it is reported that carbon will be included in ferromagnetic elements, but the root cause of carbon magnetism remains to be explored. Because of its special electronic structure, nano monolayer graphite shows various and unique magnetic properties. It is an interesting molecular based micro magnetic system. Theoretical studies have shown that the special magnetic properties of the nano graphite layer are due to the existence of the suspended 7C bond on its boundary, and the state of the suspended bond largely depends on the size and the shape of the boundary of the nano single-layer graphite. Unexpected abnormal magnetic properties have been observed in many different nanoscale massive graphite structures. These evidences show that if the appropriate size and structure can be made, the graphite structure may be a potential magnetic structure. The structure and boundary of nano graphite strongly affect its physical properties. Xi eiil studied the zigzag boundary and observed a special phenomenon of non bonded surface. Its serious boundary degradation may lead to the magnetic instability caused by the graphite structure

nano graphite not only has the traditional excellent properties of graphite, but also has the unique effect of nanoparticles. It is widely used in high-tech fields. In the printing field, nano graphite can be added to ink to make conductive ink

② preparation of nano graphite

nano graphite refers to the graphite or graphite sheet in the size of nanometer. Its structure is polyhedron, with 3-6 layers and 7-8nm graphite sheets stacked on each side. At present, the prepared nano graphite structures mainly include nano graphite sheet, nano graphite crystal, nano graphite powder, nano graphite cone, nano graphite sol, etc. The more mature preparation methods include explosion, ultrasonic, high-energy ball milling, pulsed laser liquid deposition, electrochemical method and so on

③ performance of nano graphite modified ink

nano carbon ink has conductivity, which 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 high-capacity integrated circuits, modern contact panel switches, etc. The results show that after the surface of nano semiconductor particles is chemically modified, the medium around the particles can strongly affect their optical properties, which shows that the absorption spectrum has a red shift or blue shift. Experiments show that the light absorption wave of chromium trioxide nano powder has obvious blue shift, and the light absorption wave of titanium dioxide nano powder has a large red shift. Accordingly, if they are added to yellow ink and cyan ink respectively to make nano ink, the purity of yellow ink and cyan ink can be greatly increased. Using nano ink with specific nano powder to copy and print color prints can enrich the levels of prints, make the tones more distinctive, and greatly enhance the ability to show image details, so as to obtain high-quality prints. Based on the various characteristics of nano materials, applying it to the ink system will bring a huge boost to the ink industry

2. Nano calcium carbonate is used as ink filler

the particle diameter of nano calcium carbonate is 2 ~ 10 nm. The colloidal calcium carbonate used in ink was first precipitated by calcium hydroxide and calcium carbonate, and the calcium carbonate with good transparency and gloss was prepared by surface modification. It is used to make ink with good printability. After grinding it with a certain proportion of inking oil, it can be used in ink manufacturing with proper fluidity, gloss, transparency, non gray and other properties. According to the ink production procedure (preparing ingredients, stirring, rolling, grinding, inspection and canning), in the ink production, the better the dispersion of the pigment, the smaller the average particle size, the easier it is to disperse evenly in the connecting material, and the better the ink quality. If calcium carbonate, as the physical pigment in the ink, reaches the nanometer level, and carries out surface modification to make it have good compatibility with the connecting material, it will play a great role in the production of the ink and improve the quality of the ink. Therefore, nano calcium carbonate should be used as a filler in ink manufacturing. The amount of nano calcium carbonate added to different types of inks is different. Generally, 296 ＃ 17% is used for offset printing inks, 6% for Gravure plastic inks, 12% for gravure paper inks, and 6.5% - 7% for hard plastic plates. High grade ink filler 206# is an ultra-fine calcium carbonate

3. Nano titanium dioxide used in ink

in addition to the physical and chemical properties of conventional titanium dioxide, nano titanium dioxide also has the following characteristics: ① because its particles are far smaller than half the wavelength of visible light, it has little hiding power and is transparent. And the ability to absorb and shield ultraviolet rays is very high. ② Good chemical and thermal stability, completely non-toxic, no migration. ③ The ink is made of nylon 66 Engineering polymer nano titanium dioxide as filler and resin, which can provide product molding manufacturers and automobile OEMs. Its ink film and plastic film can display pleasing pearlescent and realistic ceramic texture, and has all the optical characteristics of mica titanium pearlescent pigment, such as pearlescent effect, visual angle flicker effect, color transfer effect and additional color effect. And the color of nano titanium dioxide changes with the size of the particle size. The smaller the particle size, the more beautiful