A kind of uv-led inkjet ink for pvc leather printing and preparation method thereof

Abstract

The invention discloses a UV-LED inkjet ink for PVC leather printing and a preparation method thereof. The UV-LED inkjet ink comprises urethane acrylate oligomer, itaconic acid ester modified epoxy soybean oil, chlorinated Polydimethylsiloxane, free radical reactive diluent, cationic photosensitive monomer, nanopigment paste, photoinitiator and auxiliaries. The itaconate-modified epoxy soybean oil contains both acrylate double bonds and epoxy groups. Under UV-LED irradiation, the double bonds are rapidly cured, reducing ink diffusion and making patterns clear; epoxy groups can be post-cured to avoid Curing too fast causes the ink film to wrinkle or lose adhesion. Itaconic acid ester modified epoxidized soybean oil interacts with chlorinated polydimethylsiloxane to improve the softness and abrasion resistance of the ink film. The UV-LED inkjet ink of the invention has clear printing, 100% adhesion fastness to PVC leather, more than 30,000 times of flexural resistance, more than 200 times of abrasion resistance, good 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] Because inkjet does not require plate making, is suitable for personalized customization, and has the advantages of low pollution, it is replacing the traditional screen printing method of artificial leather and becoming a research hotspot. Existing solvent-based pigment inkjets mostly use chloroacetate resin as a binder. When printing leather, the ink often penetrates into the surface of the leather, resulting in lighter color and reduced gloss, which cannot meet customer requirements, and has high VOC content. Does not meet environmental requirements. Invention patent CN200610104941.5 discloses a pigment ink for leather digital inkjet printing. By precipitation of water-soluble macromolecules on the surface of the pigment, nano-pigment microcapsules ...

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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