Composite anti-counterfeiting film preparation method based on photonic band gap matching

A photonic band gap and thin film preparation technology, which is applied in the field of compound anti-counterfeit structural color thin film preparation, can solve the problems of high cost, complicated verification, cumbersome preparation of anti-counterfeit film, etc., and achieve the effect of low cost, fast response and difficult imitation

Active Publication Date: 2022-01-11
YANSHAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a method for preparing a composite anti-counterfeiting film based on photonic bandgap matching. The application range of the film in anti-counterfeiting, using a simple photonic bandgap matching method, the pattern at the bottom can be displayed and hidden again under certain conditions, which is convenient to solve the cumbersome preparation, expensive cost and complicated verification of the anti-counterfeiting film based on structural color The problem

Method used

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  • Composite anti-counterfeiting film preparation method based on photonic band gap matching
  • Composite anti-counterfeiting film preparation method based on photonic band gap matching
  • Composite anti-counterfeiting film preparation method based on photonic band gap matching

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preparation example Construction

[0032] Such as Figure 1 to Figure 9 Shown, a kind of composite anti-counterfeit film preparation method based on photonic bandgap matching comprises the following steps:

[0033] S1. Soak the substrate in the ethanol dispersion of nano-microspheres of different particle sizes, and pull up at a constant speed to obtain a photonic crystal structure; The fluorescence spectrum peak of the long afterglow anti-counterfeiting pattern at the bottom; the nano-microspheres are SiO 2 , PMMA, polystyrene, a kind of in CdS nano microsphere, the ethanol dispersion liquid concentration that is used for pulling is 2-8wt%, and the upward pulling speed is 2-6 μ m / s;

[0034]S2. Add the ethanol-diluted epoxy resin pregel dropwise on the surface of the photonic crystal, and cure it on a constant temperature heating platform, and then pattern the long afterglow layer. The epoxy resin pregel, black particles Mix evenly with rare earth strontium aluminate powder in a certain proportion, pour it i...

Embodiment 1

[0039] This embodiment provides a method for preparing a long-lasting composite structural color anti-counterfeiting film, such as figure 1 As shown, its structure includes: epoxy resin inverse opal structure 1; epoxy resin transparent layer 2; epoxy resin film 3 doped with carbon black; epoxy resin pattern 4 doped with long persistence material.

[0040] The preparation method of the structural color thin film includes:

[0041] (1) Firstly, SiO with particle sizes of 210nm, 240nm and 270nm 2 The nano-microspheres and absolute ethanol are respectively prepared into a dispersion with a mass fraction of 7wt% and placed in a 20ml beaker for subsequent use;

[0042] (2) Wipe the polyethylene sheet clean with ethanol and dry it, clamp it on a pulling instrument and pull it at a speed of 5 μm / s, and finally a layer of SiO2 is attached to the surface of the sheet 2 Photonic crystal structure composed of nano-microspheres;

[0043] (3) get epoxy resin A liquid: B liquid=3:1 mass r...

Embodiment 1

[0049] The present embodiment provides a composite anti-counterfeiting structured color film based on photonic bandgap matching, its structure is consistent with embodiment 1, and its preparation method comprises:

[0050] (1) Take the prepared SiO with particle size of 210nm and 240nm 2 The nanometer microspheres and absolute ethanol are prepared respectively into a dispersion solution with a mass fraction of 7wt% and placed in a 20ml beaker for subsequent use;

[0051] (2) Wipe the polyethylene sheet clean with ethanol and dry it, clamp it on a pulling instrument and pull it at a speed of 5 μm / s, and finally a layer of SiO2 is attached to the surface of the sheet 2 Photonic crystal structure composed of nano-microspheres;

[0052] (3) get epoxy resin A liquid: B liquid=3:1 mass ratio and prepare pre-gel;

[0053] (4) Mix the epoxy resin pregel and ethanol evenly in a volume ratio of 1:1 and drop it onto the photonic crystal structure on the polyethylene sheet, and place it...

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Abstract

The invention discloses a preparation method of a composite anti-counterfeiting film based on photonic band gap matching, and relates to the technical field of structural color films, and the preparation method comprises the following steps: carrying out lifting self-assembly by using an ethanol solution of monodisperse silicon dioxide nanoparticles to obtain a photonic crystal structure; the epoxy resin pregel doped with the rare earth strontium aluminate material and the carbon black forms a pattern on the photonic crystal structure through a mask method, heating and curing are conducted through a temperature control platform, and then the epoxy resin pregel doped with the carbon black is poured again and heated and cured. A structural color film prepared by the scheme of the invention has the characteristics of multiple anti-counterfeiting, high stability, quick response and the like, the application range of the structural color film in the anti-counterfeiting aspect is greatly expanded, the effect that a bottom pattern cannot be displayed under ultraviolet irradiation is achieved by using a simple photonic band gap matching method, and the problems that an anti-counterfeiting film based on structural colors is tedious in preparation, high in manufacturing cost and complex in verification are solved.

Description

technical field [0001] The invention relates to the technical field of structural color thin films, in particular to a preparation technology for composite anti-counterfeiting structural color thin films based on photonic bandgap matching. Background technique [0002] Structural color has the characteristics of bright color, corrosion resistance, never fading, and adjustable color. It has great application prospects in the fields of decoration, anti-counterfeiting, and detection. A fast, cheap and stable anti-counterfeiting method based on structural color thin films is a hot spot in the current research direction of structural color, which has attracted extensive attention of researchers. The existing structural color anti-counterfeiting methods are complicated and expensive to prepare, and the response speed is slow, and due to the choice of substrate and structure, many structural color films are difficult to control the external stimulus conditions during anti-counterfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/18C08L63/00C08K7/18C08K3/04C08K3/24
CPCC08J7/12C08J5/18C08J2363/00C08K7/18C08K2201/011C08K3/04C08K3/24
Inventor 徐朝鹏周震宇贺绍瑞孟宜南朱晓梅宋佳田边飞田东升
Owner YANSHAN UNIV
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