Photographic ink application knowledge

First, what is photocurable ink?

Photocuring resin is used as a base material of the ink. Under the irradiation of ultraviolet light, radicals are generated from the photoinitiator, which causes polymerization of the base material and photocrosslinking reaction, so that the ink is cured.

Second, the composition of UV ink and solvent ink difference

(a) The composition of UV ink

1, light-cured resin: It is the main part of UV ink, which is the connection material of UV ink, determines the nature of UV ink, such as: adhesion, viscosity, hardness, abrasion resistance, chemical resistance, solvent resistance, curing speed Wait. The resins used in the photocurable inks generally use saturated or unsaturated dibasic acid esters and acrylic resins, but different inks have different resins, and for light-curable acrylic resins, they can be divided into epoxy acrylic resins and acrylic resins. Polyurethanes, acrylic polyester resins, chlorinated polyester acrylic resins, pure acrylic polyesters, oil-modified acrylic polyesters, etc., so different inks have different properties.

2. Diluted monomers: also known as reactive monomers. It is a kind of chemical material with larger molecular weight. It can reduce the viscosity, but it is limited. It acts as a dispersing agent and determines the surface properties of the ink, such as gloss, hardness, softness, and surface smoothness, and it is involved in UV resin curing cross-linking reaction. . It is different from common monomers and has a very high boiling point. It hardly volatilizes at room temperature or does not volatilize at all.

3. Photoinitiator: It is an organic compound that excites the special group of crosslinking reaction of photocurable resin. As a photochemical reaction, the initiator becomes very excited and active when it undergoes photoexcitation and absorbs photons. It generates free radicals and energy is transferred to Polymers produce a chain reaction that changes the linear resin into a network structure that cures the ink into a tough ink film.

4, pigment: colorant. Determine the fineness of the ink, the color, and the weatherability and transparency of the ink.

5. Additives: It includes lubricants, thickeners, fillers, accelerators, etc. It affects the curing speed of the ink, the effective period of use, and the ink layer thickness. However, the printability of the ink can be improved.

(b) Comparison with ordinary ink

The functions of the two ink components are shown in Table 1, Table 2.

Table 1 Ordinary Screen Printing Ink Table 2 Light Curing Screen Printing Inks

Normal align=center> Name

Normal align=center> Function

Normal >  

Normal > name

Normal > function

Normal align=center> Resin

Normal align=center> Base material, film forming material

Normal >  


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