Like the general printing ink composition, the aqueous ink is usually composed of a coloring agent, a binder, an auxiliary agent and the like. The colorant is a coloring substance of the aqueous ink, giving the ink a specific color. In the flexo printing, in order to make the imprint bright, the coloring agent generally uses a pigment with good chemical stability and high tinting strength; the binder is composed of water, a resin, an amine compound and other organic solvents.
A pigment with high color strength; the binder is composed of water, a resin, an amine compound and other organic solvents. Resin is the most important component in water-based inks. Water-soluble acrylic resin is generally used. The components of the binder directly affect the adhesion function of the ink, the boring speed, and the anti-stick function.
Together, it also affects the gloss and ink transmission of the ink. The amine compound firstly maintains the alkaline pH of the aqueous ink, so that the acrylic resin can supply a better printing effect. The water or other organic solvent is mainly the solvent, the viscosity and the drying speed of the conditioning ink. The auxiliary agent mainly includes: defoaming agent, retarder, stabilizer, weakening agent and the like.
Because the water-based ink is a soap composition, it is easy to generate bubbles during use, so it is necessary to participate in silicone oil as a defoaming agent to press and eliminate bubbles, and improve the ink transfer function. The retarder is used to reduce the drying speed of the hydrophobic ink on the anilox roller and reduce the paste. The stabilizer can adjust the pH of the ink and can also be used as a diluent to lower the viscosity of the ink. The attenuating agent is used to lighten the color of the aqueous ink, and can also be used as a brightening agent to improve the brightness of the aqueous ink. In addition, some water-based inks also need to participate in some wax to add their wear resistance.
The physicochemical properties of different pigments, such as relative density, acidity and alkalinity, polarity and crystallization, are different. Therefore, if a variety of pigments and fillers are used in the process of manufacturing inks, often because of the large difference in physicochemical properties, even if they are strongly stirred, they can only be temporarily dispersed in the ink. When the storage time is long, pigment precipitation and floating color often occur. And so on. Therefore, the types of pigments and fillers used in the production of ink should be as small as possible. But sometimes in order to achieve hue and performance requirements, several pigments have to be used.
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