Ink is a colorant for printing. It is a
kind of fluid material which is uniformly distributed in the connecting
material by pigment particles and has certain viscosity.
composition of ink: ink is composed of
pigment, connecting material, filler, additional material, etc.
(1) Pigment: pigment plays a role in color
display in ink, and it has a direct impact on some characteristics of ink.
Pigment is a kind of high dispersive powder
which is insoluble in water and organic solvent, which is color, black or
white. According to its source and chemical composition, it can be divided into
two categories: organic pigment and inorganic pigment.
� 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.
� Organic pigments are colored organic compounds, and they are also
divided into two categories: natural and synthetic. Now, the common use is
synthetic organic pigment, organic pigment variety, color is more complete,
performance is better than inorganic pigment.
Dye is an organic compound, which can be
dissolved in water and sometimes in organic solvent. It can be used to prepare
insoluble color sediment from some dye, called lake pigment, for books printing ink.
The pigment used in printing ink is
required to be quite high, especially for color, dispersion, light resistance,
transparency, etc. the color color of color pigment is required to be close to
the spectral color, and the saturation shall be as large as possible. The
transparency of magenta, green and yellow pigments used in the three primary
color inks must be high. All pigments shall not only be water resistant, but
also be combined with the connecting materials quickly and evenly, The oil absorption
capacity of pigment should not be too large, and the pigment should have alkali
resistance, acid resistance, alcohol resistance and potential resistance.
(2) Connecting material
The binder is the main component of ink,
which plays a role of dispersing pigment, giving ink proper adhesion, fluidity
and transfer performance, and making the pigment adhere to the printing surface
by film forming after printing in books printing process.
The connecting material is commonly known as ink regulating oil.
The connecting material can be made from
various substances, such as various dry vegetable oils, most of which can be
used to make ink connecting materials, mineral oil can also be used as
connecting materials, solvents and water, and various synthetic resins can be
used to make connection materials.
The rheological property, viscosity,
neutral value, acid value, color, water resistance and printing performance of
ink are mainly determined by the connecting material. The same pigment can be
made of different types of ink by using different connecting materials; And the
same kind of connection material, use different pigments. The ink is still of
the same type. Because it can not change the basic performance of the ink, the
quality of the ink depends on the connecting material except for the pigment.
(3) Filler: filler is white, transparent,
translucent or ill posed powdery material. It can not only reduce the amount of
pigment, reduce the cost, but also adjust the properties of ink, such as thin
consistency and fluidity, and improve the flexibility of formula design.
(4) Additional materials: additional
materials are some materials added in the ink manufacturing and books printing use to improve the performance of
the ink itself. When the ink prepared according to the basic composition can
not meet the requirements in some aspects of characteristics, or the
requirements of printing cannot be met due to the change of conditions, a small
amount of auxiliary materials must be added to solve the problem.
There are many additional materials, such
as desiccant, desiccant, diluent, viscosity remover, plasticizer, etc
