UV (Ultraviolet) offset printing ink and preparation method thereof

Abstract

The invention relates to UV (Ultraviolet) offset printing ink which comprises the following components by weight: 10-20% of pigment, 30-35% of polyester acrylic resin, 15-20% of UV highly-branched polyester acrylic resin, 10-20% of acrylic ester monomer, 5-10% of photoinitiator, 0.5-3% of polymerization inhibitor, 5-20% of filler and 0.2-3% of aid. A preparation method of the UV highly-branched polyester acrylic resin comprises the following steps: preparing UV highly-branched polyester through a ring opening polymerization reaction of methyl tetrahydrophthalic anhydride and glycidol by a one-step method, wherein the number average molar weight of the polyester is 1,500-2,500, and the branching degree is 0.45-0.72; and then modifying the UV highly-branched polyester by using methacrylic acid glycidyl ester to synthesize the highly-branched polyester acrylic resin. The invention aims to provide the UV offset printing ink which has the advantages of low cost, easy synthesis, good resin wetting dispersion and excellent branch reproduction performance and is suitable for high-speed printing.

Description

Technical field: [0001] The invention relates to the field of printing inks, in particular to a UV offset printing ink suitable for high-speed printing. Background technique: [0002] UV offset printing ink is based on the action of ultraviolet radiation, relying on the free radicals or cations formed after the photoinitiator absorbs the radiation energy, triggering the polymerization, crosslinking and grafting reactions of monomers and oligomers to form a crosslinked three-dimensional network structure. Drying and curing of high molecular polymers. Most UV offset printing inks are composed of epoxy acrylic resins, polyurethane acrylic resins, polyester acrylic resins, acrylate monomers, photoinitiators, fillers, and organic pigments. Due to the incomparable advantages of traditional oil-based inks, UV offset printing inks have attracted more and more attention from the printing industry, and are widely used in cigarette packs, wine packs, cosmetic packaging, pharmaceutical...

AI Technical Summary

Problems solved by technology

[0003] Traditional UV offset printing inks have to take into account the wettability of pigments, so unsaturated polyester resins and epoxy acrylic resins are often used as the main resins. However, the drying speed of these resins is limited, the thixotropy of the ink is not enough, and the skeleton is not good, so it is difficult to adapt for high speed printing

There are also individual high-functional polyurethane acrylic resins used, but the cost is too high, and the wettability and dispersibility of the resin is not very good, so it is difficult to implement

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