Auxiliaries play an important role in the production and printing process of water-based plastic inks, and can improve some properties of water-based plastic inks. The range and types of additives are very wide, and each water-based plastic ink has a matching additive. The amount of additives used in water-based plastic inks is extremely small, but their role is very large. The three commonly used additives are briefly introduced below.
The first type is dispersant. The dispersant is mainly used in the gap between the particles. It can fully infiltrate the solid particles, so that the surface of the particles can be charged, improve the surface properties of the particles, and keep the particles more stable under the action of the charge. sex. In order to ensure that the water-based plastic ink can have good dispersibility, it is necessary to add a sufficient amount of dispersant.
The second is a leveling agent. Its use is to eliminate and reduce the surface defects of water-based plastic ink after forming, and ensure the surface of the substrate is smooth and shiny. The leveling agent can well eliminate the uneven changes on the surface of the substrate, and can also improve its wettability, thereby increasing the printing effect of the printed matter.
The third is that when the water solvent acts, many bubbles will be generated. This bubble phenomenon will affect the color and dryness of the printing process, and also affect the pigment dispersion in the water-based plastic ink, resulting in serious printing quality. problems, resulting in wasted paper. Therefore, adding an appropriate amount of defoamer in it can well improve the bubble phenomenon in the production and printing process of water-based plastic ink.
Viscosity and flow pattern
If a force is applied to a liquid such as a solvent, the force will overcome the friction in the liquid and flow, which is a common feature of various liquids. It can be described with a simple and clear example: put together thin layers of liquid, the top layer is moved by external force, and the other layers also move with this interlayer adhesion, but the bottom layer cannot move , Due to internal friction, this moving force is gradually lost with each layer.
The petroleum industry often uses the Ubb el oh de viscometer7, and the food industry often uses the Hop pler falling ball viscometer. The human liquid rotates according to a specific number of revolutions, through a spring, the required force is recorded, maintains this speed, and then a simple calculation can get the corresponding viscosity value, by changing the rotor and speed, the device can be measured The liquid has a wide range of viscosity from low to high. For a long time, there have been a large number of devices that can measure the viscosity of liquids. Simpler equipment can only measure shear rate. In certain industrial fields, certain instruments are more popular, while other viscometers are used for other purposes. Such as DIN cup [5.61, Ford cup and Tu-4 cup are widely used in the coating industry, this is because it is durable and easy to clean.
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