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Anti-counterfeiting method based on structural color change

A structural color and pattern technology, applied in the anti-counterfeiting field based on structural color change, can solve the problems of restricted use, complicated preparation process, expensive printing equipment, etc., and achieve the effect of great practicability

Inactive Publication Date: 2017-08-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the former is complicated, and the inside of the anti-counterfeiting pattern prepared is mobile phase, which limits its use (Advanced Functional Materials, 2014, 24(41): 6430-6438.), the printing equipment used in the latter is expensive, and the matrix material needs to go through Preprocessing, in addition, anti-counterfeiting can be achieved by changing the background or light source intensity (Chemistry–An Asian Journal, 2016,11(19):2680-2685.)

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] The hiding and displaying of patterns based on structural color brightness changes.

[0026] First prepare monodisperse CdS colloidal microspheres, the specific preparation method is as follows:

[0027] Weigh 6g of polyvinylpyrrolidone powder (PVP), add it into 150mL diethylene glycol solution, then add cadmium nitrate and thiourea powder with a molar ratio of 1, and stir until all the powders are completely dissolved. Heat the solution to 150-160°C, keep it warm for 5 hours, then cool it down to room temperature naturally, centrifuge the product, wash it with ethanol and water three times, dry and grind it.

[0028] Weigh a certain amount of monodisperse CdS microsphere powder, add water and absolute ethanol to prepare a dispersion with a concentration of 12wt%, in which the mass ratio of water and ethanol is 6:1, ultrasonic 20min, and put it in a cartridge.

[0029] Design a pattern with two butterflies through computer software, and connect the computer to the prin...

Embodiment 2

[0032] Anti-counterfeiting application of fast-response matrix codes based on structural color brightness changes.

[0033] Use the ink in embodiment 1, generate a quick response matrix code by computer software design, utilize ink-jet printer to print matrix code on high-gloss photo paper, obtain the quick response matrix code that can be hidden and displayed, and when can observe bright In structural color, the matrix code can be scanned and linked.

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Abstract

The invention discloses an anti-counterfeiting method based on structural color brightness change. Dispersion liquid containing monodisperse nano-microspheres is printed on paper by utilizing an ink-jet printer, and the nano-microspheres are arrayed and assembled on the paper to obtain short-range order. According to a microstructure of long-range disorder, due to the interaction effect of the structure and light, the bright structural color can be observed, the display of patterns is realized, an observation angle is changed, the brightness of the structural color is reduced, and patterns or quick response matrix codes are hidden. The method is simple and convenient, external stimulation is not needed, and anti-counterfeiting can be quickly realized.

Description

technical field [0001] The invention relates to the anti-counterfeiting field of patterns, in particular to an anti-counterfeiting method based on structural color change. Background technique [0002] Structural color is produced by the interaction between light and the microstructure of matter. This interaction includes light scattering, interference and diffraction. It has directionality. When viewed from different angles, the color may be different. At present, the methods of using structural color to realize anti-counterfeiting mainly include two categories: one is to prepare a responsive polymer film by etching technology, and realize anti-counterfeiting through external stimuli; the other is to print monodisperse nanoparticles on Treated glass, polydimethylsiloxane and other substrate materials. The preparation process of the former is complicated, and the inside of the anti-counterfeiting pattern prepared is mobile phase, which limits its use (Advanced Functional Ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M3/14
CPCB41M3/148
Inventor 武素丽常杰刘宝琦张淑芬
Owner DALIAN UNIV OF TECH
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