The hottest nanotechnology tradition and its appli

2022-08-06
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The tradition of nanotechnology and the application of digital printing I. Introduction the development and evolution of printing technology, the content of which is from symbols to black and white to color; Manuscript from analog to digital; Production mode from manual to mechanical and then to computer automation; The printing ink from water-based, oil-based to the current nano level printing ink. At the time of the global development of digital ink-jet printing, when the lower collet clamping button is pressed to clamp the test piece, the situation is normal, which may indicate that the working oil path is not smooth when the lower collet is loosened. The core technology not only focuses on how to develop high-speed, large number and low-cost machines, but also focuses on the research and development of ink-jet and laser consumables. In particular, the current major nano pigments or functional pigments can best meet the requirements of wide color gamut, water resistance, weather resistance, low cost, high value and applicable to a variety of substrates. At present, the application opportunity of nano pigments lies in the development of traditional ink printing and ink-jet printing. What is the ideal pigment characteristic:

1 Fresh 2 Good penetrability 3 High color intensity 4 Lightfastness 5 Water resistance 6 Durable

and listing regulatory filing generally speaking, do dyes have bright colors? The advantages of nature and good penetrability, and the problems of poor water, light and weather resistance. Generally applicable to textiles, wood and indoor printing; The traditional pigments have the advantages of water resistance, light resistance and weather resistance, but the color is not fresh enough? Saturation and poor color intensity. Suitable for printing, coating and outdoor printing. The main difference between Nano pigments developed in the laboratory at present is the size of particles. The average particle size of traditional pigments ranges from 100 to several microns (UM), while the definition of nano pigments is less than 100 nm. Nowadays, most nano products are darker than the primary color in appearance. The reason is that the particles become smaller and the body surface area becomes larger. When light passes through the pigment, it will continue to scatter when encountering small particles, resulting in less light. As a result, the reflectivity decreases and the optical properties change, so it will look a bit dark. The viscosity has also changed from hundreds to tens of thousands of high viscosity to low viscosity (about less than 20 CPS)

II. Industry entry point:

1 Development of digital inkjet machines and ink heads: at present, there is a large demand for low price digital inkjet machines and their consumables in the market, mainly water-based pigments and dyes; As it may involve the development patent of other companies, it can be carried out in two aspects: quick drying or hardening machine and ink head

2. Preparation of pigment dispersion masterbatch: at present, it is the technical cooperation of Japan or other countries to develop their own technology, so that the upstream and downstream industries can be connected without being limited by others

3. Traditional ink formula technology: when the pigment reaches nano particles, the particles are easy to gather, so the particle stabilization technology is the primary condition

4. Digital inkjet formulation technology: application of various water-based inkjet inks (table, wide and industrial) and UV hardening inkjet. Its main niche depends on the following four points:

1 Replace imported products 2 Establish new product technology 3 Cost reduction 4 Practical solution to the key common problems of civil aircraft materials diffusion application technology

III. application of nano pigments in inkjet printing:

1 Digital ink-jet or traditional color filter

2 Desktop/industrial/commercial/wide format/photo inkjet printer

3 UV hardening ink jet ink to large Kanban/Poster

IV. what is nano

nano is a description of the physical scale, and the length of 1 nanometer (nm) is meters. At the nano scale, it generally refers to the range from 1nm to 100 nm. The properties of matter do not belong to the macroscopic horizon of classical physics or the microscopic behavior of quantum physics, but present the so-called mesoscopic phenomenon. Nano materials refer to nano particles, fibers, granular films, multilayers or nano phase materials composed of atomic clusters (including grains or phases) with at least one-dimensional size ranging from 1nm to 100nm. (1nm = m) 。 The dimensions of nanoscience are: M-100 mm-m μ M-M nano-m v. the difficulties and technical bottlenecks of nano pigment: today's pigments are generally aggregated large particles of several microns to submicron units. Now, in order to reach the particle size of nanometer (30 nm), the specific surface area has changed from 1 unit to 100 units, and the van der Waals force will be greater than 100, At this time, the most important problems are grinding dispersion technology, inkjet formula and colloidal dispersion and stabilization technology

1. Grinding and dispersion technology:

in the process of pigment micronization, the grinding method is mainly wet grinding and dispersion, and the method is high-energy dispersant and high collision frequency (20~30m/s) to impact grinding. Here, the grinding machine and grinding material are the two main parts

a. grinder:

(a) Traditional grinding machine: there are two types: vertical and horizontal. At present, the horizontal ball mill is generally used. Its disadvantages are complex system design, difficult maintenance, high price and large grinding medium (0.25mm). However, the vertical ball mill is rarely used because the grinding balls are heavy and concentrated at the bottom of the machine, resulting in uneven grinding

(b). Nano scale dispersion equipment: in order to improve the existing equipment, the Institute of chemical industry has developed a new grinding medium separation system. It is a material manufacturing equipment with wear resistance and high heat transfer effect. It can use ultra-fine medium (100 UM) for grinding and improve blade speed (15~30m/s)

b. grinding medium: at present, most of the grinding materials are yttrium or zirconium, the traditional grinding materials are 0.30~1.0mm, and the really good medium is less than 0.1mm (ultra-fine medium). It can increase the collision point between particles and the effective shear force surface

2. Ink jet formula and colloidal dispersion and stabilization technology: in order not to affect the stability of particles due to excessive cohesion, dispersants or interfacial active agents can be used. The principle is to add dispersant or interfacial active agent to make the surface of particles charged. Based on the same-sex repulsion principle, particles will not attract and gather each other, so as to achieve stability

VI. application/market of nano pigments:

application content characteristics related industry market value (100 million yuan) ink color quality wide color gamut 20 (2~3%) paint color quality wide color gamut 300 (2~3%) ink jet ink color quality wide color gamut 4 (20~30%) LCD transmittance improved color gamut wide color quality 6 (20~30%) Conclusion:

nano pigment technology can be widely applied to every technology. For example, in the aspect of traditional printing ink, it can improve color saturation and reduce the number of color masterbatches; The color gamut and durability can be doubled on the inkjet printer; In the aspect of display, it can increase the color gamut and light penetration by more than 10%; In terms of textile inkjet, there can be a small number of diversified textile inkjet and the advantages of environmental protection and low pollution... Etc., and even special chemicals for medical use and cosmetics can be used for effective use. At the same time, we should pay attention to two points: cost and effect. If the unit cost of the developed product remains high, I am afraid it will be difficult to popularize and the market may not accept it; In addition, if the effect is not as good as expected or is not different from the original process and product, it will also affect the follow-up research power. Therefore, nano pigments are the new development trend in the future. However, we are not confined to the size of particles, but focus on the benefits of micronization, so as to improve the added value of products and enhance the competitiveness of the industry. That is the real purpose of our pressure testing machine to eliminate the errors of our pressure testing machine

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