Preparation of Fast Light-curing Water-based UV Ink and Wear Resistance of Ink Film

Abstract

Ultraviolet curing (UV) water-based inks have the advantages of low viscosity, high gloss, and a wide range of applications. But there are defects such as slow curing speed and low degree of crosslinking. In this paper, the copolymer P(MMA-r-AA) was prepared by traditional free radical polymerization using methyl methacrylate (MMA) and acrylic acid (AA) as monomers, and the copolymer P(MMA-r-AA) was modified by hydroxyethyl methacrylate (HEMA) to obtain acrylic prepolymer P(MMA-r-AA)-g-HEMA contained double bonds. The reaction of triethylenetetramine and glycidyl methacrylate (GMA) yielded a multifunctional reactive diluent triethylenetetramine hexamethacrylic acid glycidyl amide (TGMA). Secondly, acrylic prepolymer P(MMA-r-AA)-g-HEMA, multifunctional reactive diluent TGMA, photoinitiator and yellow pigment were used to prepare UV-curing ink. The influence of the type and mass fraction of photoinitiator, the relative molecular weight and mass fraction of P(MMA-r-AA)-g-HEMA, and the number of functional groups and mass fraction of TGMA on the photocuring speed of UV ink and the abrasion resistance of ink film were discussed. When the mass fraction of the photoinitiator TPO was 1%, the numberaverage relative molecular mass of the prepolymer was 1.99×10 5 g/mol and the mass fraction was 40%, and the number of functional groups of the reactive diluent was 6 and the mass fraction was 60%, the light curing of water-based UV ink was completed in 0.1s, and the mass loss after 50 times abrasion was about 0.2%. And this kind of UV ink can be used to prepare UV conductive ink and UV magnetic ink.