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Physical unclonable structural color anti-counterfeiting label with multiple anti-counterfeiting modes

An anti-counterfeiting label and cloning technology, which is applied in the field of anti-counterfeiting materials and structural color materials, can solve the problems of ignoring the application of anti-counterfeiting fields, weak non-iridescent structural colors, etc., and achieve the effect that the identification cannot be cloned and the identification is simple

Active Publication Date: 2020-02-07
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its weak and unobtrusive non-iridescent structural color makes people ignore its application in the field of anti-counterfeiting

Method used

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  • Physical unclonable structural color anti-counterfeiting label with multiple anti-counterfeiting modes
  • Physical unclonable structural color anti-counterfeiting label with multiple anti-counterfeiting modes
  • Physical unclonable structural color anti-counterfeiting label with multiple anti-counterfeiting modes

Examples

Experimental program
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Effect test

Embodiment 1

[0018] First, add 20 nm SiO 2 Nanoparticles and SiO 2 Acrylic-modified polyurethane with a mass ratio of nanoparticles of 0.8:1 is dispersed in water to form SiO 2 A dispersion with a mass fraction of nanoparticles of 10%. Second, spin-coated the above dispersion onto black cardboard to form an intermediate white coating that becomes transparent when exposed to water. Third, spray an emulsion containing 10% monodispersed polystyrene-polymethylmethacrylate-polyacrylic acid colloidal microspheres with a particle size of 205 nm and a mass fraction of 10% to the middle white color to obtain disordered optics with butterfly patterns. Structured non-rainbow color structured security label. When dry, the white of the disordered optical structure coating is close to the white of the intermediate coating, and the butterfly pattern is hidden, such as figure 1 As shown; after being exposed to water, the green butterfly pattern appears ( figure 1 ). This realizes the first invisible anti-...

Embodiment 2

[0020] First, mix 5 nm calcium fluoride nanoparticles with a polyacrylic resin with a mass ratio of 0.1:1 to the calcium fluoride nanoparticles and ultrasonically disperse in water to form a dispersion with a mass fraction of calcium fluoride nanoparticles of 10%. Second, dip-coating the dispersion liquid on black PVC plastic paper to form an intermediate white coating that becomes transparent when exposed to water. Third, spray an emulsion containing 10% monodispersed silica colloidal microspheres with a particle size of 120 nm and a mass fraction of 10% to the middle white to obtain a non-iridescent structured color anti-counterfeiting color with a disordered optical structure with a two-dimensional code pattern label. When dry, the white of the disordered optical structure coating is close to the white of the intermediate coating, and the QR code pattern is hidden; after being exposed to water, the purple QR code pattern appears. This realizes the first invisible anti-count...

Embodiment 3

[0022] First, 100 nm titanium dioxide nanoparticles and a polyvinyl alcohol resin with a mass ratio of titanium dioxide nanoparticles of 2:1 are ultrasonically dispersed in water to form a dispersion with a mass fraction of titanium dioxide nanoparticles of 10%. Second, dip-coating the above-mentioned dispersion on a black metal sheet to form an intermediate white coating with the property of becoming transparent when exposed to water. Third, spray an emulsion containing monodisperse polystyrene colloidal microspheres with a particle size of 1000 nm and a mass fraction of 10% to the middle white to obtain a non-iridescent structured color security label with a disordered optical structure with a barcode pattern. When dry, the white of the disordered optical structure coating is close to the white of the intermediate coating, and the bar code pattern is hidden; after the water changes, the red bar code pattern appears. This realizes the first invisible anti-counterfeiting mode. ...

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Abstract

The invention discloses a physical unclonable structural color anti-counterfeit label with multiple anti-counterfeit modes. The physical unclonable structural color anti-counterfeit label is composedof a patterned surface layer with a disordered optical structure, a water-transparent white middle layer and a black background bottom layer. White caused by non-coherent scattering of the disorderedoptical structure surface layer to light is matched with the white middle layer, and the disordered optical structure surface layer is hidden; when the anti-counterfeit label encounters water, the white middle layer becomes transparent, the black bottom layer uniformly absorbs light, the color saturation of the structural color surface layer is improved, and patterns of the structural color surface layer appear. Therefore, a first invisible anti-counterfeiting mode visible to naked eyes is realized. And after the structural color surface layer encounters water, the reflection spectrum of the structural color surface layer is subjected to red shift, so that a second spectrum anti-counterfeiting mode is realized. Random arrangement of the monodisperse microspheres in the disordered optical structure has a physically unclonable attribute, and the monodisperse microspheres can be identified by means of artificial intelligence to realize a third physically unclonable anti-counterfeiting mode.

Description

Technical field [0001] The invention relates to an anti-counterfeiting label based on structural colors, in particular to a physical unclonability structural color anti-counterfeiting label with multiple anti-counterfeiting modes, and belongs to the technical field of anti-counterfeiting materials and structural color materials. Background technique [0002] Counterfeit and shoddy is a global problem, which not only causes huge economic losses, but also brings great harm to individuals, enterprises and even the entire society. Although a large number of advanced anti-counterfeiting technologies have been developed, such as fluorescence, thermochromic, plasma optics, watermarking and laser holographic patterns, the economic losses caused by counterfeit and shoddy are still growing rapidly worldwide. Therefore, it is urgent to develop a more advanced, efficient, and portable anti-counterfeiting technology to reverse the growth trend. An ideal anti-counterfeiting strategy should ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/06G06K19/02G06Q30/00
CPCG06K19/06028G06K19/022G06Q30/0185
Inventor 周金明贺雪莹谷亚楠张亚娟
Owner HEBEI NORMAL UNIV
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