First, water-based lotion Aqueous emulsion is a colloidal dispersion system with water as the continuous phase and oil or other non-aqueous substances as the dispersing phase. It is a stable dispersion system formed by tiny oil droplets coated with surfactants. Water-based emulsion has many significant advantages, such as its low viscosity, easy to brush, easy to clean, non-toxic and harmless. Therefore, it has been widely used in various industrial fields, such as coatings, textiles, plastics and so on. Second, dispersion Dispersion is a colloidal dispersion system consisting of solid or liquid particles dispersed in liquid. Compared with water-based emulsions, the dispersion has a weak interaction force between particles, so it is easy to disperse and not easy to gather. Dispersions have a wide range of applications, such as pharmaceutical preparation of oral suspensions or sustained-release agents; In the preparation of pigments or automotive paints, dispersions can be used as thickeners and stabilizers. Third, the performance difference between water-based emulsion and dispersion 1.Stability The stability of water-based emulsions is higher than that of dispersions. Because the attraction between particles in water-based coatings is greater, it is easy to coagulate and precipitate. However, the particles in the dispersion have less interaction force and are easy to aggregate and precipitate. 2.Water resistance Water-based emulsion has better water resistance, and can form emulsion in water, without stratification; Dispersions generally do not have water resistance. 3.Transparency The transparency of dispersions is generally higher than that of water-based emulsions, which makes dispersions have a wide range of application prospects. However, due to the dispersion of oil droplets in the emulsion, water-based emulsions tend to have better covering power than dispersive emulsions. 4.Economy In the case of the same performance, the cost of the dispersion is lower than that of the water-based emulsion, because the preparation of the dispersion system does not require surfactants and other special additives. In short, water-based emulsions and dispersions have their special properties and advantages. According to the actual needs and application scenarios, it is particularly important to choose a suitable decentralized system.

In the process of UV flexographic printing, the viscosity of the ink is one of the key factors that affect the printing quality and effect. Choosing the right viscosity UV flexographic ink is crucial to ensure printing quality and efficiency. When adjusting viscosity, it is usually necessary to consider many factors such as printing equipment, printing materials, image details and the expected printing effect. The viscosity of UV flexographic inks is usually between 200 and 600 centipoise (cps). This range helps to achieve good flow and transfer performance during flexographic printing. The exact viscosity value will vary depending on the brand and application needs, so referring to the ink manufacturer's technical data sheet is an effective way to obtain an accurate viscosity value. When we cannot obtain data from the ink manufacturer, we need to detect the viscosity of the ink through some technical means. So what effect does the viscosity of ink have on printing? Below we compare high viscosity and low viscosity inks from various aspects: 1.Printing quality The viscosity of the ink directly affects the printing quality: High viscosity: May lead to poor transfer of ink between the plate and the substrate, resulting in defects such as blurred images or ink accumulation. Low viscosity: May lead to excessive ink flow, resulting in uneven printing, color inconsistency or leakage problems. 2.Dot reproduction Viscosity affects dot reproduction:High viscosity: may cause the reproduction ability of small dots to decline, dot increase or deformation, affecting the image fineness. Low viscosity: It is easier to reproduce small dots, but too low viscosity can cause the printed image to be unclear. 3.Color saturation and brightness Viscosity has a significant effect on color performance: High viscosity: Usually provides high color saturation and brightness because the high viscosity ensures that sufficient ink volume is transferred to the substrate. Low viscosity: May lead to insufficient color saturation and brightness, dull printing effect. 4.Drying rateViscosity affects the drying speed of the ink: High viscosity: Longer UV curing times may be required because of the higher concentrations of photoinitiators and resins in high viscosity inks and the slower curing process. Low viscosity: usually the drying speed is faster, but too low viscosity may lead to too thin ink layer, affecting the curing effect. 5.Adaptability of printing equipment Viscosity affects the adaptability of ink to printing equipment: High viscosity: It may be necessary to adjust the Settings of the printing equipment, such as greater pressure or speed, to ensure uniform ink transfer. Low viscosity: It is generally easier to adapt to various printing equipment, but it still needs to be adjusted appropriately according to the specific situation.

Aluminum foil can also be printed with water-based ink. As a non-absorbent substrate, aluminum foil poses a major challenge to water-based ink printing. However, some aluminum foil products that require food-grade printing cannot be printed with oil-based inks, so water-based inks have become the best choice. However, due to the poor absorption of aluminum foil to water-based ink, many inexperienced printing plants may suffer from fading after printing. Let's break it down below. First, the quality of the ink itself Lack of adhesion: The adhesion of water-based ink on aluminum foil is a key factor affecting the printing effect. If the adhesion of the ink is insufficient, it is easy to lead to the fading of the text after printing. This may be related to the formula of the ink, the type of resin and its compatibility with the aluminum foil. Poor wear resistance: the wear resistance of the ink is also an important factor affecting the fading problem. If the wear resistance of the ink is insufficient, it is susceptible to friction and fading during subsequent processing or use. Poor drying performance: The drying speed of water-based ink also has a significant impact on the printing effect. If the ink dries too slowly or unevenly, it may cause the ink layer to be contaminated or scratched before curing, resulting in fading. Second, printing process conditions Uneven printing pressure: If the pressure is not uniform during the printing process, it will lead to inconsistent adhesion of the ink on the aluminum foil, thus affecting the printing effect. Insufficient pressure may cause the ink to not transfer sufficiently to the aluminum foil, while too much pressure may destroy the ink layer, resulting in fading. Improper drying temperature and time control: drying temperature and time have a direct impact on the drying effect of water-based ink. If the drying temperature is too high or the drying time is too long, it may lead to excessive drying of the ink layer and cracking; If the temperature is too low or the time is too short, it may lead to the ink layer is not completely dry, easy to fade. Printing speed: Printing speed is too fast or too slow may affect the transfer and drying effect of the ink, resulting in fading problems. Third, the characteristics of the substrate material (aluminum foil) Surface characteristics: The surface treatment and roughness of aluminum foil will affect the adhesion and printing effect of the ink. If the surface of the aluminum foil is too smooth or there are impurities such as oil and oxide, it may lead to insufficient ink adhesion and fading. Material differences: Aluminum foil produced by different manufacturers may have differences in material, which will also affect the adhesion and printing effect of the ink. Therefore, when choosing aluminum foil, it is necessary to consider its compatibility with ink. Fourth, environmental factors Temperature and humidity: the temperature and humidity of the printing workshop h...

Most coatings are composed of a base material (one or more resin mixtures), pigments (including physical pigments and functional pigments), solvents and some small amounts of additives and other coating raw materials. In the production of coatings, after the selection of various coating raw materials necessary for coating components, the next is how to make reasonable use of the technical and economic properties of coating raw materials to produce high-quality coatings. As we all know, the selection of various coating raw materials has a great impact on the performance of the coating. If one component is not selected properly, the entire paint formulation may fail. Therefore, in the overall composition arrangement of the coating formula, in addition to fully considering the role of each component, there is also consideration of compatibility and synergy between various components. After selecting the appropriate component, the volume concentration of the pigment must also be taken into account. In addition, the influence of the solvent on the construction process of the coating and the coating performance, as well as the role of the solvent on the control of the fluidity, viscosity, and drying time of the coating are all issues that must be considered in the correct selection of the coating raw materials and the overall raw material formulation design. Alkyd resin is the most used resin in coating production, its raw materials are easy to obtain and the manufacturing process is simple. Alkyd resin contains a large number of ester groups, so the way of modification is very wide. Thixotropic coatings can be prepared with polyamide modified alkyd resin, and amino resin can be used as excellent coating materials for coil and home appliance coatings. Varnish requires no pigment ratio. But color paint must be added to increase color and coverage. The varnish is colorless and transparent, and has no covering power, so the color paint with color and covering power accounts for the highest proportion of paint varieties. Pigment is one of the most important paint raw materials. Before the use of paint pigments, it is necessary to focus on the color, hiding power and coloring power performance. Color is the color that the coating product needs to achieve, which is correctly selected when selecting pigments after it is clearly defined in the overall plan of coating production; The covering power of pigment is related to its refractive index, crystal type and particle size. Among the known pigments, rutile TiO2 has the largest refractive index and the largest refractive index difference between it and the polymer, so it is the white pigment with the best hiding power. The hiding power of the pigment depends not only on the amount of light scattered by the paint, but also on the absorption capacity of the light irradiated on it. For example, carbon black does not reflect light at all, but can absorb all the light irradiated on it, so its hiding power is the st...