The ink is composed of pigments, connecting materials, fillers, additional materials, etc.
(1) Pigment
Pigments play a role in color development in the ink, and it has a direct impact on some characteristics of the ink.
Pigments are colored, black, or white powders with high dispersibility that are insoluble in water and organic solvents. According to their sources and chemical composition, they are divided into two categories: organic pigments and inorganic pigments.
â‘ Inorganic pigments are oxides of non-ferrous metals, or some metal-insoluble metal salts. Inorganic pigments are divided into natural inorganic pigments and artificial inorganic pigments. Natural inorganic pigments are mineral pigments.
â‘¡Organic pigments are colored organic compounds, which are also divided into two categories: natural and synthetic. Synthetic organic pigments are now commonly used. There are many types of organic pigments, with a relatively complete range of colors and better performance than inorganic pigments.
Dyes are organic compounds, which are soluble in water and sometimes in organic solvents. Insoluble color precipitates, called lake pigments, can be prepared from certain dyes and used in the manufacture of printing inks.
The pigments used in printing inks are quite demanding, especially the color, dispersion, light fastness, transparency, etc. The color hue of the color pigments is required to be close to the spectral color, and the saturation should be as large as possible. The transparency of the pigment must be high. All pigments must not only be water-resistant, but also be quickly and evenly combined with the binder. The oil absorption capacity of the pigment should not be too large. The pigment should preferably have alkali resistance, acid resistance, alcohol resistance and resistance.
(2) Connection material
The binder is the main component of the ink, which plays a role in dispersing the pigment, giving the ink proper adhesion, fluidity and transfer performance, and fixing the pigment on the surface of the printed product through film formation after printing. The connecting material is commonly known as ink-adjusting oil.
The connection material can be made of various materials, such as various dry vegetable oils, most of which can be used to make ink connection materials, mineral oil can also be made of connection materials, solvents and water, and various synthetic resins can be used to make Connection material.
The rheology, viscosity, neutrality, acid value, color, water resistance and printing performance of the ink mainly depend on the connecting material. The same pigment and different connecting materials can be used to make different types of ink; and the same connecting material , Use different pigments. The ink made is still the same type of ink, because it can not change the fundamental performance of the ink, so the quality of the ink, except for the pigment, mainly depends on the connecting material.
(3) Filler
The filler is a white, transparent, translucent or unclear powdery substance. It mainly plays a role of filling, filling the pigment part, and using some fillers appropriately, which can not only reduce the amount of pigment and cost, but also adjust the properties of the ink, such as thinness, fluidity, etc., and also increase the flexibility of formula design.
(4) Additional materials
Additional materials are some materials added to improve the performance of the ink itself in the manufacture of ink and in printing. When the ink formulated according to the basic composition still cannot meet the requirements in some characteristics, or due to changes in conditions, it can not meet the requirements for printing and use, a small amount of auxiliary materials must be added to solve.
There are many additional materials, such as: desiccant, anti-drying agent, diluent, debonding agent, plasticizer and so on.
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