Silk screen is more and more popular in people's lives, mainly because the silk screen is vivid and easy for consumers to accept. Then introduce the common sense and skills of screen printing ink.

1. Ink composition

(1) Connecting material

The binder is the main component of the screen printing ink, which acts as a dispersing pigment, imparts proper adhesion, fluidity and transferability to the screen printing ink, and acts to fix the pigment on the surface of the print by film formation after printing. The connecting material is commonly known as varnish, as well as the commonly used ink knives.

The binder can be made of various materials, such as various dry vegetable oils, most of which can be used to make ink binders, mineral oils can also be used as binders, solvents and water, and various synthetic resins can be used to make the binder. Connection material.

The rheology, viscosity, neutrality, acid value, color, water resistance and printing performance of screen printing inks mainly depend on the binder, the same pigment, different binders can be used to make different types of screen printing inks; The binder is used with different pigments. The same type of screen printing ink is still produced, because it can not change the basic performance of the ink, so the quality of the screen printing ink is good, except for the pigment, it mainly depends on the connecting material.

(2) Pigments

Pigments are color, black or white, highly dispersible powders that are insoluble in water and organic solvents. They are classified into organic pigments and inorganic pigments depending on their source and chemical composition.

1 Inorganic pigments are oxides of non-ferrous metals, or some metal-insoluble metal salts. Inorganic pigments are further classified into natural inorganic pigments and artificial inorganic pigments, and natural inorganic pigments are mineral pigments.

2 organic pigments are colored organic compounds, which are also divided into two major categories, natural and synthetic. Nowadays, synthetic organic pigments are commonly used, and there are many varieties of organic pigments, and the colors are relatively complete, and the performance is superior to inorganic pigments.

Dyes are organic compounds which are soluble in water and sometimes dissolved in organic solvents. Insoluble dyes can be prepared from certain dyes, called lake pigments, for the manufacture of printing screen printing inks.

The pigments used in printing inks are quite demanding, especially the color, dispersion, light resistance, transparency, etc., and the color tone of the color pigment is required to be close to the spectral color, the saturation should be as large as possible, and the magenta, cyan, and the three primary color screen printing inks are used. The transparency of the yellow pigment must be high. All the pigments must not only have water resistance, but also be quickly and uniformly combined with the binder. The oil absorption capacity of the pigment should not be too large, and the pigment has properties such as alkali resistance, acid resistance, alcohol resistance and resistance.

(3) Additives

Additives are materials that are added in the manufacture of screen printing inks and in the use of printing to improve the performance of the screen printing ink itself. Screen printing inks formulated according to the basic composition may not meet the requirements in some characteristics, or may not be satisfied by the conditions of printing, and a small amount of auxiliary materials shall be added to solve the problem.

(4) Filler

The filler is a white, transparent, translucent or unsuitable powdered material. Mainly filling, filling the pigment part, appropriate use of some fillers, can reduce the amount of pigment, reduce costs, and adjust the properties of screen printing ink, such as thick, fluid, etc., also improve the flexibility of formula design.

There are many additives, such as: desiccant, anti-drying agent, thinner, detackifier, plasticizer and so on.