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Water-based fluorescent ink as well as preparation method and application thereof in full-color printing and encryption anti-counterfeiting

A fluorescent ink, water-based technology, applied in the production of special varieties of printed matter in the direction of printing, application, ink, etc., can solve the problems of complex production process, forgery, poor ink stability and other problems of oil-soluble fluorescent ink

Pending Publication Date: 2021-12-07
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the fluorescent inks used in the market are oil-soluble, and the viscosity of the ink is relatively high, which cannot be used in high-throughput inkjet printers. Moreover, the production process of oil-soluble fluorescent inks is relatively complicated, and it is easy to pollute the environment.
The emerging quantum dot ink is an ink prepared by using luminescent quantum dots as raw materials. Its production cost is high, and the ink has poor stability and short service life.
[0004] In addition, most of the fluorescent anti-counterfeiting technologies currently on the market use ultraviolet light excitation to display hidden information such as anti-counterfeiting icons or QR codes. The degree of information encryption is not high, and there is still the possibility of being forged
There are also some anti-counterfeiting and encryption inks prepared with up-conversion fluorescent nanoparticles. The printed patterns of this ink need to be excited by high-power infrared lasers to obtain encrypted information. Although the anti-counterfeiting ability of up-conversion fluorescent inks has been greatly improved, However, high-power infrared lasers are more harmful to the human body, and are often limited in actual use.

Method used

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  • Water-based fluorescent ink as well as preparation method and application thereof in full-color printing and encryption anti-counterfeiting
  • Water-based fluorescent ink as well as preparation method and application thereof in full-color printing and encryption anti-counterfeiting
  • Water-based fluorescent ink as well as preparation method and application thereof in full-color printing and encryption anti-counterfeiting

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Experimental program
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preparation example Construction

[0070] The present invention also provides the preparation method of the water-based fluorescent ink described in the above scheme, comprising the following steps:

[0071] Dispersing polystyrene beads in toluene to obtain polystyrene nanoparticles toluene solution;

[0072]Mixing UV-cured fluorescent dye and polystyrene nanoparticle toluene solution to obtain fluorescent dye-polystyrene nanoparticle toluene solution; the UV-cured fluorescent dye is UV-cured red, green or blue fluorescent dye;

[0073] Mix ethanol, water, glycerol and surfactant to obtain a continuous phase;

[0074] The fluorescent dye-polystyrene nanoparticle toluene solution and the continuous phase were subjected to shear emulsification in a four-jet multi-inlet vortex mixer to obtain a fluorescent dye-polystyrene nanoparticle toluene emulsion.

[0075] The toluene in the fluorescent dye-polystyrene nanoparticle toluene emulsion is volatilized and removed to obtain the water-based fluorescent ink.

[007...

Embodiment 1

[0101] (1) First, dissolve and disperse polystyrene (PS) pellets with a weight average molecular weight of 192,000 in toluene to prepare polystyrene nanoparticle toluene solution, wherein the mass fraction of PS is 1% (referred to as 1%PS@toluene ). During the preparation process, PS beads are added in batches and the dispersion process of PS beads is accelerated by ultrasound, so as to ensure that the PS nanoparticles dispersed in toluene have a smaller particle size and uniform distribution.

[0102] (2) Add red fluorescent dye to 1% PS@toluene, control the mass fraction of red fluorescent dye in the red fluorescent dye-polystyrene nanoparticle toluene solution to be 5%, and vortex 30s on the vortex instrument, make the dye Mix well with PS to obtain a red fluorescent dye-polystyrene nanoparticle toluene solution (recorded as 5% Red dye@1%PS@toluene).

[0103] (3) Prepare ink continuous phase: first prepare 10% ethanol aqueous solution, then mix 10% ethanol aqueous solution...

Embodiment 2

[0109] Other conditions are consistent with embodiment 1, only in step (2), the mass fraction of red fluorescent dye in control red fluorescent dye-polystyrene nanoparticle toluene solution is respectively 1%, 3%, 5%, 7% and 10% %; The concentration of SDS in the ink continuous phase is controlled to be 20mg / mL in step (3). Test the fluorescent intensity of gained water-based fluorescent ink, the obtained result is as follows Figure 7 shown, according to Figure 7 It can be seen that the fluorescence intensity of the ink increases with the increase of the fluorescent dye content.

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Abstract

The invention relates to the technical field of water-based fluorescent ink, and provides water-based fluorescent ink as well as a preparation method and application thereof in full-color printing and encryption anti-counterfeiting. The water-based fluorescent ink provided by the invention comprises the components: polystyrene nanoparticles, a surfactant, water, ethanol, glycerol and a UV-cured fluorescent dye, wherein the fluorescent dye is a red, green or blue fluorescent dye. The fluorescent ink with three colors of red, green and blue is prepared by adopting an instantaneous nano precipitation method, the high-viscosity fluorescent dye is dispersed and transferred from an oil phase to a water phase, and the obtained water-based fluorescent ink takes water as a main continuous phase, is good in safety and relatively low in viscosity, can be used for a high-flux civil ink-jet printer and can realize diversification and high efficiency of printed patterns. Patterns printed by the ink are completely invisible under natural light, different colors are displayed under ultraviolet light with different wavelengths, the ink can be used for full-color printing, the pattern quality is good, and the ink has wide application prospects in fluorescent color-changing encryption and anti-counterfeiting.

Description

technical field [0001] The invention relates to the technical field of water-based fluorescent ink, in particular to a water-based fluorescent ink, a preparation method thereof and an application in full-color printing and encrypted anti-counterfeiting. Background technique [0002] The main component of fluorescent ink is fluorescent dye, which is a functional luminescent pigment. The difference from ordinary pigments is that when irradiated by external light (ultraviolet light, etc.), it can absorb a certain form of energy and excite photons, which will be absorbed in the form of low visible light. The energy is released, resulting in different hues of fluorescence, different colors of light combined to form an unusually bright color, and when the light stops irradiating, the luminescence disappears, so it is called fluorescent pigments. [0003] At present, most of the fluorescent inks used in the market are oil-soluble, and the viscosity of the ink is relatively high, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/50B42D25/378B41M3/14
CPCC09D11/50B42D25/378B41M3/144
Inventor 冯欢欢高逸凡王敏赵维巍马星张嘉恒
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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