Water-based ink group for leather printing

By combining modified polyethyleneimine and modified titanium dioxide color paste, the problem of water-based pigment ink seeping and ink pooling on the leather surface is solved, and the printing effect with high adhesion and good friction resistance is achieved, which is suitable for leather inkjet printing.

CN120349680APending Publication Date: 2025-07-22ZHUHAI FREE TRADE ZONE NEOJET APOLLOJET IMAGING MATERIALS
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Patent Information

Application Number
CN202510384056.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-28
Publication Date
2025-07-22

AI Technical Summary

Technical Problem

Existing aqueous pigment inks have problems with bleeding and ink pooling on the leather surface, resulting in unclear printing patterns and easy to fall off. Traditional solutions such as coating water-based polyurethane or using cationic pigment inks have problems with complex process, high cost or solvent residue.

Method used

Using a pretreatment liquid containing modified polyethyleneimine and a pigment ink that is self-dispersed color paste or titanium dioxide color paste, a stable cationic layer is formed on the leather surface by modifying polyethyleneimine, combining electrostatic and physical anchoring effects, improving the ink coating binding force, and forming a uniform background through white ink to enhance the ink setting effect of color ink.

Benefits of technology

It achieves no color leakage and ink accumulation on the surface of the leather, the printing pattern is scratch-resistant and bending-resistant, and the process is simple and the feel is good.

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Abstract

The invention provides a water-based ink set for leather printing, the water-based ink set comprises pretreatment liquid and pigment ink, and the pretreatment liquid is applied in front of the pigment ink; the pretreatment liquid comprises a first surfactant and modified polyethyleneimine; the pigment ink comprises a second surfactant and color paste, and the color paste is self-dispersing color paste or titanium dioxide color paste. The ink set is printed on the surface of leather without bleeding and ink gathering, the process is simple, and the hand feeling is good.
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