UV-LED inkjet ink for PVC leather printing and preparation method thereof

Abstract

The invention discloses UV-LED ink-jet ink for PVC leather printing and a preparation method of the UV-LED ink-jet ink. The UV-LED inkjet ink is composed of a polyurethane acrylate oligomer, itaconatemodified epoxidized soybean oil, chlorinated polydimethylsiloxane, a free radical reactive diluent, a cationic photosensitive monomer, nano pigment color paste, a photoinitiator and an auxiliary agent. The itaconate modified epoxidized soybean oil contains acrylate double bonds and epoxy groups at the same time, the double bonds are rapidly cured under UV-LED irradiation, ink diffusion is reduced, and patterns are clear; the epoxy group can be post-cured, so that an ink film is prevented from wrinkling or the adhesive force is prevented from being reduced due to over-fast curing. Itaconate modified epoxidized soybean oil and chlorinated polydimethylsiloxane interact with each other, so that the softness and wear resistance of the ink film are improved. The UV-LED ink-jet ink provided by the invention is clear in printing, 100% in PVC leather adhesion fastness, more than 30,000 times in flexure resistance, more than 200 times in wear resistance and good in aging resistance, and is suitable for PVC leather printing.

Description

technical field [0001] The invention relates to the technical field of PVC leather inkjet printing, in particular to a UV-LED inkjet ink for PVC leather printing and a preparation method thereof. Background technique [0002] Inkjet is replacing the traditional screen printing method of artificial leather and has become a research hotspot because it does not require plate making, is suitable for personalized customization, and has the advantages of less pollution. The existing solvent-based pigment inkjet inkjet mostly uses vinyl resin as the binder. When printing leather, the ink often seeps into the leather surface, resulting in lighter color and lower gloss. It cannot meet customer requirements, and the VOC content is high. Does not meet environmental protection requirements. Invention patent CN200610104941.5 discloses a pigment-based ink for leather digital inkjet printing. By precipitating water-soluble polymers on the surface of the pigment, stable and dispersed nano-...

AI Technical Summary

Problems solved by technology

The existing solvent-based pigment inkjet inkjet mostly uses vinyl resin as the binder. When printing leather, the ink often seeps into the leather surface, resulting in lighter color and lower gloss. It cannot meet customer requirements, and the VOC content is high. Does not meet environmental protection requirements

Invention patent CN200610104941.5 discloses a pigment-based ink for leather digital inkjet printing. By precipitating water-soluble polymers on the surface of the pigment, stable and dispersed nano-pigment microcapsules are formed and made into an inkjet ink. As the main solvent, it is green and environmentally friendly, but for non-absorbent PVC leather, the drying speed is an urgent problem to be solved by water-based inkjet

[0003] At present, the printing of UV-LED inkjet on PVC leather mainly has the following problems: 1) digital printing requires inkjet ink to have low viscosity, and low viscosity ink is easy to scatter on non-absorbent PVC substrates, resulting in unclear patterns; By increasing the content of multifunctional monomers or photoinitiators in inkjet inks, the curing speed can be increased and ink diffusion can be reduced, but the mechanical properties of the ink film will be affected; 2) the use of leather requires the ink film to have good flexibility and flex resistance , It also requires good wear resistance, but there is a contradiction between the flexibility and friction resistance of the ink film. The improvement of flexibility is mostly based on the sacrifice of wear resistance. Polyurethane acrylate has good flexibility and wear resistance. But still can't fully meet the requirements; 3) The plasticizer content in PVC leather is as high as more than 40%, which is easily affected by temperature, pressure and the medium in contact, and precipitates from PVC, so that the ink printed on the soft material dissolves and falls off , causing the surface of the leather to be oily, sticky, etc., and contact with the human body will also endanger human health

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