The components and functions of gravure ink and offset ink - Company news - Zhangjiagang Free Trade Zone Covord Chemical Technology Co., Ltd.

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The components and functions of gravure ink and offset ink

2022-07-26 13:36:00

1. Gravure ink

Four components: resin + pigment + solvent + filler

Resin, also known as binder, is mainly to uniformly disperse pigments and fillers, and to form protection around them without precipitation. It mainly affects the viscosity, adhesion, abrasion resistance and gloss of the ink.

Pigments include organic pigments, inorganic pigments and fuels. Organic pigments are added to the colored substance in a highly dispersed state to achieve the purpose of coloring. Organic pigments have a wide range of chromatograms, brighter shades, strong tinting strength, soft particles, easy to grind, and are significantly better than inorganic pigments in hue, transparency, and acid and alkali resistance.

Inorganic pigments are superior to organic pigments in terms of light resistance, weather resistance, heat resistance, and solvent resistance.

Dyes are organic compounds that can dye fibers or other dyed materials into various colors. They are divided into acid dyes, basic dyes, reactive dyes, sulfur dyes, etc., and generally have high color concentration and transparency.

A solvent, also known as a solvent, is a substance capable of dissolving other substances. The stronger the dissolving power of the solvent, the greater the dissolving speed and the lower the dissolving concentration. It is a low-viscosity liquid, which has the ability to adjust the viscosity, and also plays the role of dissolving resin, dispersing colorant, and improving the fluidity of ink.

Fillers are also known as fillers, fillers, and fillers. Usually calcium carbonate, aluminum hydroxide, silicon dioxide and other solid materials. Used to change the viscosity, ductility and uniformity of the ink.

2. Offset printing ink (UV-curable ink)

Principle of UV curing: The photoinitiator in the ink absorbs UV light of a specific wavelength and transforms into an excited state, and forms an active group that participates in the reaction. These reactive groups cause the prepolymer and the monomer to undergo charge transfer to form a complex, crosslinking and polymerization occur in a very short time, and a polymer with a three-dimensional network structure is formed, thereby curing.

Main components: photoinitiator + diluent monomer + prepolymer + pigment + auxiliary

Photoinitiators: absorb energy to generate reactive groups

Diluent monomer: its own viscosity is low, which can adjust the viscosity of the ink; it is classified according to the degree of functionality, which affects the curing rate and the flexibility of the film layer.

Prepolymer: A component with high content in UV ink, which affects the flexibility, emulsification, adhesion, chemical resistance and other properties of the product.

Pigments: not only affect all properties related to color, but also weather resistance, transparency, etc.

Additives: Additives are selectively added according to different needs. For example, a certain amount of polymerization inhibitor will be added to prevent deterioration caused by polymerization in the transportation diagram.

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