A preparation method of composite anti-counterfeiting film based on photonic bandgap matching

A technology for photonic band gap and film preparation, which is applied in the field of composite anti-counterfeiting structural color film preparation, can solve the problems of cumbersome preparation of anti-counterfeiting films, high cost, complicated verification, etc., and achieves the effects of being difficult to imitate, low in cost, and fast in response.

Active Publication Date: 2022-06-03
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • 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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  • A preparation method of composite anti-counterfeiting film based on photonic bandgap matching
  • A preparation method of composite anti-counterfeiting film based on photonic bandgap matching
  • A preparation method of composite anti-counterfeiting film based on photonic bandgap matching

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preparation example Construction

[0032] like Figure 1 to Figure 9 As shown, a method for preparing a composite anti-counterfeiting film based on photonic band gap matching includes the following steps:

[0033] S1. Immerse the substrate in ethanol dispersions of nano-microspheres with 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 , one of PMMA, polystyrene, and CdS nano-microspheres, the concentration of the ethanol dispersion used for pulling is 2-8wt%, and the upward pulling speed is 2-6μm / s;

[0034]S2. Drop the epoxy resin pregel diluted with ethanol on the surface of the photonic crystal, and solidify it on a constant temperature heating platform, and then pattern the long afterglow layer. The epoxy resin pregel, black particles It is mixed evenly with rare earth strontium aluminate powder in a certain proportion, poured int...

Embodiment 1

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

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

[0041] (1) First, the prepared SiO with particle size of 210nm, 240nm and 270nm 2 Nano-microspheres and anhydrous ethanol were respectively prepared into a dispersion with a mass fraction of 7wt% and placed in a 20ml beaker for later use;

[0042] (2) The polyethylene sheet was wiped clean with ethanol and dried, and was clamped on a pulling instrument and pulled at a speed of 5 μm / s, and finally a layer of SiO was attached to the surface of the sheet. 2 Photonic crystal structure composed of nano-microspheres;

[0043] (3) take epoxy resin A liquid: B liquid=3:1 ma...

Embodiment 1

[0049] The present embodiment provides a kind of composite anti-counterfeiting structural color film based on photonic band gap matching, and its structure is consistent with embodiment 1, and its preparation method includes:

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

[0051] (2) The polyethylene sheet was wiped clean with ethanol and dried, and was clamped on a pulling instrument and pulled at a speed of 5 μm / s, and finally a layer of SiO was attached to the surface of the sheet. 2 Photonic crystal structure composed of nano-microspheres;

[0052] (3) take epoxy resin A liquid: B liquid=3:1 mass ratio to prepare pregel;

[0053] (4) the epoxy resin pregel and ethanol are uniformly mixed at a volume ratio of 1:1 and added dropwise to the photonic crystal structure on the polyethylene s...

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Abstract

The invention discloses a method for preparing a composite anti-counterfeiting film based on photonic bandgap matching, and relates to the technical field of structural color films, including: using an ethanol solution of monodisperse silicon dioxide nanometer microspheres to obtain a photonic crystal structure by pulling and self-assembling. The mask method forms the epoxy resin pregel doped with rare earth strontium aluminate material and carbon black to form a pattern on the photonic crystal structure, and is heated and cured by the temperature control platform, and then pours the epoxy resin pregel doped with carbon black again And heat curing. The structural chromatic film prepared by the scheme of the present invention has the characteristics of multiple anti-counterfeiting, high stability and fast response, which greatly improves the application scope of the structural chromatic film in anti-counterfeiting, and uses a simple photonic bandgap matching method to achieve UV The effect of the underlying pattern cannot be displayed under light irradiation, which is convenient to solve the problems of cumbersome preparation, high cost and complicated verification of structural color-based anti-counterfeiting films.

Description

technical field [0001] The invention relates to the technical field of structural color films, in particular to a preparation technology for composite anti-counterfeiting structural color films based on photonic band gap matching. Background technique [0002] Structural color has the characteristics of bright color, corrosion resistance, never fading, adjustable color, etc., and has a huge application prospect in decoration, anti-counterfeiting, detection and other fields. The realization of fast, cheap and stable anti-counterfeiting methods based on structural color films is a hot spot in the current research direction of structural colors, 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 selection of substrates and structures, many structural color films are difficult to control the external stimulus conditions during an...

Claims

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Application Information

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Patent Type & Authority Patents(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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