Gravure printing ink has been put into production in China for more than 30 years. According to the connecting material, it can be divided into chlorinated polypropylene, polyamide and polyurethane. Chlorinated polypropylene ink currently accounts for half of food packaging, but its development is limited by insurmountable shortcomings:1) non-environmental protection, requiring a large dose of aromatic hydrocarbons such as toluene as solvent, aromatic hydrocarbons volatilized into the environment during the printing process, causing pollution; 2) unsafe, toluene and other aromatic hydrocarbons are slow drying solvents, easy to remain on the ink film, causing pollution. Packaged food is easy to volatilize into the air, harmful to consumers' health. 3) Narrow scope of application, only for BOPP film has good printing adaptability. Because of the low melting point and decomposition temperature of chlorinated polypropylene resin, it is difficult to be used for boiling and cooking food packaging requiring high temperature. Polyamide inks also mainly rely on aromatic solvents. Although there are a few alcohol-soluble products, the poor temperature resistance and water resistance of polyamide resin limit its application in cooking packaging. Polyurethane ink without benzene solvent has the advantages of low toxicity, good printing adaptability to various plastic film materials, high temperature cooking resistance, freezing resistance, wear resistance, good gloss of printing products, etc. Obviously better than the former two, with strong development potential.

Black, blue, red, yellow four-printing composite inks for PET, NY, BOPP film were prepared by adding dispersant, dumb powder, environmental protection pigment, solvent and other additives with polyurethane resin as the main linker. It is a polymer used in printing inks. Dyeing power, fineness, viscosity, initial dryness, surface tension, residual solvent and boiling resistance were determined and analyzed. After testing, the series ink formula is simple, does not contain benzene, ketone, solvent residue is less than 1.0 mg/m2, meet the requirements of food packaging. It is a kind of safe, environmental protection boiling general type. The utility model relates to a new gravure printing compound ink product. Vinyl Resin For gravure composite printing inks for flexible packaging of food are mainly used in plastic packaging.

The adhesion fastness of the ink obtained from this formula on NY and PET film is much higher than the requirements of domestic industry, and the adhesion performance is excellent. This is due to the strong interaction between the polyurethane resin molecules with polar structure and NY and PET molecules with the same polar structure. Polyurethane resin molecules and PET molecules have ester groups, intermolecular force is strong. The measured value is 100%.

BOPP is a typical nonpolar molecule. The interaction between BOPP and polar polyurethane resin molecules is weak, and the bonding fastness is almost 0. When preparing BOPP thin desert ink, the influence of ink on BOPP thin film can be enhanced by introducing weak polarity molecules similar to BOPP into the formula. Weakly polar chlorinated polypropylene resin is the most commonly used adhesion enhancer for BOPP film inks. In order to facilitate use without benzene, a low molecular weight chlorinated polypropylene resin solution (40% solid content, solvent is methyl cyclohexane and ethyl acetate) is the preferred adhesion enhancer for general formulations and is mixed after grinding to form a colorant.

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