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Fluorescent anti-counterfeiting ink based on light-emitting quantum dots and preparation method as well as application thereof

A technology of light-emitting quantum and anti-counterfeiting ink, applied in ink, application, household appliances and other directions, can solve the problems of low content of fluorescent agent, inability to produce anti-counterfeiting effect, dull color and other problems, and achieve the effect of simple process, obvious anti-counterfeiting effect and low cost.

Inactive Publication Date: 2013-09-11
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of fluorescent agent in this kind of ink is too low, and the color is dull under the irradiation of ultraviolet lamp, which cannot produce the ideal anti-counterfeiting effect

Method used

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  • Fluorescent anti-counterfeiting ink based on light-emitting quantum dots and preparation method as well as application thereof
  • Fluorescent anti-counterfeiting ink based on light-emitting quantum dots and preparation method as well as application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 20mL self-made purple light zinc oxide quantum dot ethanol solution modified by silane coupling agent, redisperse in acetone solution after precipitation, centrifugation and washing to obtain zinc oxide quantum dot zinc oxide quantum dot surface modified by silane coupling agent An acetone solution of quantum dots with a dot content of 0.08 g.

[0032] The obtained quantum dot acetone solution was added to 4.0 g of transparent varnish, ultrasonically dispersed for 5 minutes, and the acetone solvent and air bubbles were vacuumed out to obtain a fluorescent anti-counterfeiting ink of zinc oxide quantum dots surface-modified by a silane coupling agent;

[0033] In the obtained fluorescent anti-counterfeiting ink based on luminescent quantum dots, the weight ratio of the zinc oxide quantum dots surface-modified by the silane coupling agent to the transparent varnish is 2:100.

[0034] The quantum dot anti-counterfeiting ink is colorless under natural light, and emits p...

Embodiment 2

[0036] Take 5mL of the homemade blue light zinc oxide quantum dot ethanol solution, precipitate, centrifuge, wash and redisperse in the acetone solution to obtain a quantum dot acetone solution with a zinc oxide quantum dot content of 0.02g.

[0037] Add the quantum dot acetone solution to 4.0 g of transparent varnish, disperse it ultrasonically for 10 minutes, and vacuum out the acetone solvent and air bubbles to obtain a fluorescent anti-counterfeiting ink of zinc oxide quantum dots. In the obtained fluorescent anti-counterfeiting ink, the weight ratio of the zinc oxide quantum dots to the transparent varnish is 0.5:99.5.

[0038] The quantum dot anti-counterfeiting ink is colorless under natural light, and emits blue light with a wavelength of 450nm under the irradiation of an ultraviolet lamp.

Embodiment 3

[0040] Take 10 mL of homemade green light lanthanum-doped zinc oxide quantum dot ethanol solution, precipitate, centrifuge, wash and redisperse in acetone solution to obtain a quantum dot acetone solution with a content of 0.04 g of lanthanum-doped zinc oxide quantum dots.

[0041] Add the quantum dot acetone solution to 4.0 g of transparent varnish, disperse it ultrasonically for 15 minutes, and vacuum out the acetone solvent and air bubbles to obtain a fluorescent anti-counterfeiting ink doped with lanthanum zinc oxide quantum dots. In the obtained fluorescent anti-counterfeiting ink, the weight ratio of the lanthanum-doped zinc oxide quantum dots to the transparent varnish is 1:99.

[0042] The quantum dot anti-counterfeiting ink is colorless under natural light, and emits green light with a wavelength of 495nm under the irradiation of an ultraviolet lamp.

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Abstract

The invention relates to fluorescent anti-counterfeiting ink based on light-emitting quantum dots. The ink comprises transparent gloss oil and light-emitting quantum dots. The weight ratio of the light-emitting quantum dots and transparent gloss oil in the fluorescent anti-counterfeiting ink to the ultraviolet fluorescent anti-counterfeiting function is (0.05-5):(99.95-95). A preparation method of the ink comprises the steps of: preparing the light-emitting quantum dots and dispersing the light-emitting quantum dots in acetone to obtain light-emitting quantum dot-acetone solution; and then adding the corresponding light-emitting quantum dot-acetone solution taken according to the content of the light-emitting quantum dots in the anti-counterfeiting ink to the transparent gloss oil and carrying out vacuum extraction on the solvent after uniform mixing to obtain the fluorescent anti-counterfeiting ink based on the light-emitting quantum dots. The anti-counterfeiting ink is invisible, is colorless and transparent under the natural light, can emit different colors of visible light under the ultraviolet light, has an obvious anti-counterfeiting effect, is suitable for the printing methods such as silk screen printing, seal printing and intaglio printing and can be applied to anti-counterfeiting of such bills as tickets, invoices and bank notes and packaging materials.

Description

technical field [0001] The invention relates to a fluorescent anti-counterfeiting ink based on luminescent quantum dots, more specifically, the invention relates to an ultraviolet fluorescent anti-counterfeiting ink based on luminescent quantum dots and its preparation method and application. Background technique [0002] With the advancement of science and technology and the improvement of living standards, people have higher and higher requirements for product quality. In order to effectively prevent the proliferation of counterfeit and shoddy products and increase the crackdown on counterfeit and shoddy products, it is necessary to improve anti-counterfeiting technology and means in order to achieve high-quality and high-performance anti-counterfeiting purposes. The fluorescent components in traditional anti-counterfeiting inks are mostly organic dyes or fluorescent powders, and their mass fraction in anti-counterfeiting inks exceeds 30% in order to achieve a relatively o...

Claims

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Application Information

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IPC IPC(8): C09D11/02C09D11/06
Inventor 付绍云孙丽伟史汉桥肖红梅
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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