Photo-cured printing ink for ink-jet printer

Abstract

The invention discloses photo-cured printing ink for an ink-jet printer, relates to a preparation method of the photo-cured printing ink, and belongs to the technical field of ink-jet printing. The photo-cured printing ink comprises 30-90wt% of epoxy monomer, 5-50wt% of diluents, 0.1-20% of coloring agents, 0-20wt% of dispersing agents, 0.5-40wt% of auxiliaries and the like which are grinded and scattered to obtain color paste, 0.1-20% of photo-initiators and sensitizers are added into the mixture, the mixture is sufficiently dissolved and scattered in ink by stirring and ultrasound, and the ink is filtered at multiple stages and then degassed to obtain the photo-cured printing ink. The photo-cured printing ink can be used for the ink-jet printer and has the advantages that the ink is completely cured, the curing degree is also increased, the size is reduced, oxygen inhibition is avoided, zero VOC (volatile organic compounds) emission is avoided, environmental pollution is decreased, cured wavelengths move towards visible light, and the application range is extended.

Description

technical field [0001] The invention belongs to the technical field of inkjet printing, and in particular relates to a photocurable printing ink for an inkjet printer and a preparation method thereof. Background technique [0002] Inkjet printing is a printing method in which small droplets of an ink composition are dispersed and sprayed onto a substrate (paper, plastic, textile, metal, etc.) according to a set program, because of its high printing accuracy and fast printing speed. features are widely used. Ink is particularly important to the quality of inkjet printers, and the performance requirements of inkjet ink are also very strict. First, it needs to be safe, non-toxic, odorless, and good storage stability, as well as low viscosity and suitable surface tension. [0003] Traditional inks can be divided into water-based and solvent-based inks according to their main components. Water-based inks are mainly composed of water, colorants and various additives. There are tw...

AI Technical Summary

Problems solved by technology

[0003] Traditional inks can be divided into water-based and solvent-based inks according to their main components. Water-based inks are mainly composed of water, colorants and various additives. There are two defects in their use: one is that the drying time is too long. The production speed is increased, and the second is that due to the limited materials that can absorb water, the range of substrates that can use water-based inks is narrow

The solvent-based ink is different, because the organic solvents used have fast volatilization characteristics, which can effectively reduce the impact of drying time on production speed. The problem is that most organic solvents have toxicity and flammability. , will pollute the environment

[0004] Photocurable inks can be divided into free radical photocurable inks and cationic photocurable inks according to the curing mechanism. Among them, free radical curing has the characteristics of fast drying, easy performance adjustment, and relatively low raw material prices. The following problems: shallow curing depth, easy polymerization inhibition in oxygen atmosphere, poor adhesion and many other problems, especially the free radical-induced system has a large molding shrinkage rate, which affects the adhesion to the substrate and limits the scope of use of the substrate.

Due to this series of shortcomings, the application of free radical curing in many fields is limited.

In addition, whether it is free radical curing or cationic curing, the applicable light source is mostly ultraviolet light, which has large radiation and is harmful to the human body.