Oxygen inks, oil-modified resins, pigments, fillers, driers, ink volume to complete the storage of environmental temperature, humidity and other factors have some impact on the ink on the crust in the use of anti-skinning agent, you must take into account the above factors, add The amount of the following seven basic knowledge, but should also pay attention to the issue: How to effectively prevent the ink tank?
High color pigments; the binder consists of water, resins, amines and other organic solvents. Resin is the most important component in water-based inks. Generally, water-soluble acrylic resin is used. The components of the binder directly affect the adhesion function of the ink, the boring speed, and the anti-sticking function.
Together also affect the ink luster and ink transfer, amine compounds to maintain the alkaline pH of water-based ink, so that the acrylic resin to provide better printing, water or other organic solvents is mainly to dissolve the resin, adjust the ink viscosity and boring speed Auxiliary agents mainly include: defoamers, retarders, stabilizers, weakening agents, and the like.
Because the water-based ink is a kind of soap composition, it is easy to produce bubbles in the application, so it is necessary to participate in the silicone oil as a defoamer, to press and eliminate bubbles, together with the transfer function of the ink. Blocking agents are used to retard the dryness of hydrophobic inks, to prevent the ink from drying on the anilox roll, and to reduce the stencil. Stabilizers can condition the pH of the ink, and can also be used as a diluent to reduce the viscosity of the ink. The abatement agent is used to reduce the color of freshwater inks and can also be used as a brightener to improve the brightness of aqueous inks. In addition, waterborne inks must also participate in some waxes to add their wear resistance.
The pH of the water-based ink is directly related to the viscosity of the water-based ink, printability such as drying. Experiments show that the viscosity of water-based ink increases linearly with the decrease of PH value, and its drying rate decreases linearly with the gradual increase of PH value. The pH value of water-based ink mainly depends on the maintenance of amines. Volatilization of amines during the printing process causes the pH value to drop. This causes the viscosity of the ink to rise, the transferability to be poor, the drying to speed up, the anilox roller to clog, and the stencil failure.
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