Filling material in a printing ink
Barium sulfate has a relatively large density and can be used in printing inks to improve the rheological properties of certain relatively light pigments. However, excessive use will affect the printability of the ink.
Aluminum hydroxide is a typical amphoteric compound that is insoluble in water but dissolves in acid and alkali solution. Aluminum hydroxide has been widely used in oil-based ink. It not only acts as filling material, but also is a good thickener. Aluminum hydroxide with dispersion and strong stretching force of good, but also easily lead to ink colloidization. At present, it has been gradually replaced by colloidal calcium carbonate.
Colloidal calcium carbonate is a new kind of filling material, which is characterized by fine particles and large surface area. Compared with natural calcium carbonate and light calcium carbonate, calcium carbonate has many advantages, such as large oil absorption, high transparency, good brightness and good stability, so it has been widely used in printing ink. In practical applications, colloidal calcium carbonate is divided into general colloidal calcium carbonate and transparent colloidal calcium carbonate, the latter particles are more subtle, with greater oil absorption and transparency. Colloidal calcium carbonate is a commonly used filling material in resin printing inks.
Filler is a transparent, translucent or opaque white powder material, is also a solid component of ink. It plays a filling role in the ink, mainly as a pigment filling material, used to reduce the amount of pigment, reduce the cost of ink, but also adjust the ink color, improve ink printability. Filling material in the amount of ink is not large. Filling materials are mainly colloidal calcium carbonate, aluminum hydroxide, barium sulfate and other white solid powder.
