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Multi-response color-changing anti-counterfeiting film and preparation method thereof

A multi-response, thin-film technology, applied in the field of optical anti-counterfeiting, can solve the problems of single response discoloration mechanism and low anti-counterfeiting level, and achieve the effect of easy use, high anti-counterfeiting level and high mechanical strength

Active Publication Date: 2021-12-14
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the photonic crystal structural color anti-counterfeiting and quantum dot fluorescent anti-counterfeiting have the disadvantage of a single response color change mechanism, resulting in a low level of anti-counterfeiting

Method used

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  • Multi-response color-changing anti-counterfeiting film and preparation method thereof
  • Multi-response color-changing anti-counterfeiting film and preparation method thereof
  • Multi-response color-changing anti-counterfeiting film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Firstly, the fluorescent colloidal particles are prepared through the following steps: (1) Using 180-300nm silicon dioxide nanospheres with good monodispersity as the core, using 3-aminopropyltriethoxysilane to Carry out amination modification on the surface of the ball, stir at 70°C for 12 hours to make it positively charged; mix it with negatively charged 3-10nm cadmium telluride water-soluble quantum dots, adjust the pH of the mixed solution to 6, after 3 hours Magnetic stirring, the fluorescent quantum dots are loaded on the surface of the amination-modified nano-microspheres through the electrostatic self-assembly method, and finally a layer of silica shell is coated on the outer layer to obtain fluorescent colloidal particles.

[0033] (2) Fully mix the polymer monomer polydimethylsiloxane and the curing agent at a mass ratio of 10:1 to form a pre-solid solution, evenly coat it on an acrylic template, and dry it in an oven at 60°C for 2 hours to form a film Hydrop...

Embodiment 2-6

[0036] Titanium dioxide, zirconium dioxide, tin dioxide, cerium dioxide, and zinc oxide were used instead of silicon dioxide in Example 1 as nano-microspheres, and other conditions were consistent with Example 1. The obtained transparent film exhibits the fluorescent color of quantum dots under ultraviolet light, and exhibits bright photonic crystal structural colors in a stretched state.

Embodiment 7

[0038] First prepare fluorescent colloidal particles, which are prepared through the following steps: (1) Using 180-300nm silica nanospheres with good monodispersity as the core, using 3-aminopropyltrimethoxysilane to treat the microspheres The surface is modified by amination, and stirred at 70°C for 11 hours to make it positively charged; it is mixed with negatively charged 3-10nm cadmium sulfide water-soluble quantum dots evenly, and the pH of the mixed solution is adjusted to 7, and after 3 hours of magnetic stirring , through the electrostatic self-assembly method, the fluorescent quantum dots are loaded on the surface of the amination-modified nano-microspheres, and finally a layer of silica shell is coated on the outer layer, so as to obtain fluorescent colloidal particles.

[0039] (2) Fully mix the polymer monomer polydiethylsiloxane and the curing agent at a mass ratio of 10:1 to form a pre-solid solution, evenly coat it on an acrylic template, and dry it in an oven at ...

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Abstract

The invention discloses a multi-response color-changing anti-counterfeiting film and a preparation method thereof, and belongs to the field of optical anti-counterfeiting. The color-changing anti-counterfeiting film is composed of three layers, the upper layer and the lower layer are obtained by curing a pre-solid liquid composed of a polymer monomer and a curing agent into a film, and the middle layer is a photonic crystal layer formed by self-assembly of fluorescent colloid particles. The fluorescent colloidal particles are obtained by loading quantum dots on colloidal microspheres and then coating the outer layer with a shell layer. The color-changing anti-counterfeiting film can present a fluorescent color under the irradiation of an ultraviolet lamp, can generate visual structural color change after being stretched to a certain degree, can recover the initial shape and color after the pulling force is removed, is anti-counterfeiting according to the color change of the film, and is simple, convenient and feasible. Compared with single structural color anti-counterfeiting and single fluorescent anti-counterfeiting, the film has multiple response color change characteristics, realizes collaborative anti-counterfeiting of photonic crystal structural color and quantum dot fluorescence, improves the anti-counterfeiting level, and has wide application prospects in the anti-counterfeiting field.

Description

technical field [0001] The invention belongs to the field of optical anti-counterfeiting and specifically relates to a multi-response color-changing anti-counterfeiting film and a preparation method thereof. Background technique [0002] Counterfeit and shoddy products are an increasingly serious global problem, which greatly threatens national reputation, enterprise survival and consumer rights, especially fake and shoddy medicines and food, which seriously endanger human health. Therefore, the development of new anti-counterfeiting technology to identify the authenticity of products and prevent counterfeiting is of great significance to improving the image of the country, promoting the development of enterprises and safeguarding the rights and interests of consumers. Among many anti-counterfeiting technologies, optical anti-counterfeiting technology is based on the color discrimination of the human eye. It is simple and reliable, and has inherent advantages in public anti-...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08J5/18C08L83/04C09D5/22C09D5/29C09D1/00
CPCC08J7/0423C08J5/18C09D5/22C09D5/29C09D1/00C08J2383/04C08J2483/04
Inventor 王文涛周意诚杨柳姚玉元
Owner ZHEJIANG SCI-TECH UNIV
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