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Anti-counterfeiting one-dimensional photonic crystal film and preparation method thereof

A dimensional photonic crystal and optical disc technology, which is applied in the field of anti-counterfeiting, can solve the problems of complex preparation method and high cost of photonic crystal materials for anti-counterfeiting, and achieve the effects of environmental friendliness, good anti-counterfeiting effect and good concealment.

Pending Publication Date: 2021-12-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a photonic crystal material for anti-counterfeiting with simple preparation, low cost and wide application, so as to solve the technical problems of complex preparation method and high cost of photonic crystal material for anti-counterfeiting in the prior art

Method used

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  • Anti-counterfeiting one-dimensional photonic crystal film and preparation method thereof
  • Anti-counterfeiting one-dimensional photonic crystal film and preparation method thereof
  • Anti-counterfeiting one-dimensional photonic crystal film and preparation method thereof

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preparation example Construction

[0030] The preparation method of the one-dimensional photonic crystal film for anti-counterfeiting provided by the present invention comprises: adding polyvinyl alcohol into water, heating and stirring to dissolve to obtain a polyvinyl alcohol solution, cooling the polyvinyl alcohol solution and injecting it into a one-dimensional photonic crystal mold, drying Release the mold to prepare a one-dimensional photonic crystal film for anti-counterfeiting.

[0031] Among them: the mass volume ratio (g / mL) of polyvinyl alcohol and water is 0.5-1:10. For example, you can choose 0.5:10, 0.8:10, 1:10, etc.

[0032] The temperature of heating and stirring is 80-100°C. For example, 80°C, 82°C, 85°C, 90°C, 95°C, 97°C, 100°C, etc. can be selected.

[0033] The drying temperature is 20-40°C. For example, 20°C, 25°C, 28°C, 30°C, 31°C, 35°C, 40°C, etc. can be selected.

[0034] The drying time is 15-48h. For example, 15h, 20h, 25h, 33h, 35h, 40h, 45h, 48h, etc. can be selected.

[0035]...

Embodiment 1

[0042] A method for preparing a one-dimensional photonic crystal film for anti-counterfeiting, comprising:

[0043]Weigh 2.0g of polyvinyl alcohol (PVA), add 30ml of deionized water, stir magnetically at 85°C for 60min until completely dissolved, cool to room temperature, let stand for 24h to remove air bubbles, and obtain the PVA solution; cut the DVD disc into 2cm* 4.5cm rectangle, then clean the grooved side of the disc with ethanol, remove the polymer on it, blow dry, and place the grooved side of the disc against the glass sheet to prepare a one-dimensional photonic crystal mold with a sandwich structure; The PVA solution was injected into a one-dimensional photonic crystal mold, and dried at 25° C. for 24 hours to prepare a one-dimensional photonic crystal film for anti-counterfeiting.

[0044] The anti-counterfeiting one-dimensional photonic crystal film prepared in this embodiment has high transparency, colorless, soft texture, good toughness, can be bent freely and do...

Embodiment 2

[0046] A method for preparing a one-dimensional photonic crystal film for anti-counterfeiting, comprising:

[0047] Weigh 1.5g of polyvinyl alcohol (PVA), add 30ml of deionized water, stir magnetically at 80°C for 60min until completely dissolved, cool to room temperature, let stand for 18h to remove air bubbles, and obtain a PVA solution; inject the PVA solution into a one-dimensional photon The crystal mold (the one-dimensional photonic crystal mold is the same as that in Example 1) was placed at 40° C. and dried for 36 hours to prepare a one-dimensional photonic crystal film for anti-counterfeiting.

[0048] The anti-counterfeiting one-dimensional photonic crystal film prepared in this example has high transparency, colorless, soft texture, good toughness, can be bent arbitrarily and is not easy to leave traces; when rotated at a certain angle under natural light, it will appear as a whole with obvious iridescent colors, and the light source is added. The structural color i...

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Abstract

The invention belongs to the technical field of anti-counterfeiting, and provides an anti-counterfeiting one-dimensional photonic crystal film and a preparation method thereof. The preparation method comprises the following steps: adding polyvinyl alcohol into water, heating, stirring and dissolving to obtain a polyvinyl alcohol solution, cooling the polyvinyl alcohol solution, injecting the cooled polyvinyl alcohol solution into a one-dimensional photonic crystal mold, drying, and demolding to obtain the one-dimensional photonic crystal film for counterfeiting prevention. The anti-counterfeiting one-dimensional photonic crystal film provided by the invention can be made into an anti-counterfeiting mark in any shape, is colorless and transparent, and has good concealment; the photonic crystal film does not contain any chemical dye component and is environment-friendly; the anti-counterfeiting effect is good, and the anti-counterfeiting mark is rotated by a certain angle under natural light to present obvious iridescent; the photonic crystal film also has the characteristics that the iridescent intensity can be enhanced under an external light source and diffraction spots can appear under laser irradiation, and can be used for secondary anti-counterfeiting detection. The preparation method is simple and easy to operate, good in safety, excellent in stability, low in requirements on production equipment and low in cost, and can be applied to industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of anti-counterfeiting, and in particular relates to a one-dimensional photonic crystal film for anti-counterfeiting and a preparation method thereof. Background technique [0002] With the development of society and the progress of science and technology, counterfeit products spread more and more widely, seriously disrupting the market. Anti-counterfeiting technology is a preventive technical measure to protect corporate brand and consumer interests, maintain normal business operations and combat counterfeit products, and is widely used in various products. [0003] Among the existing anti-counterfeiting technologies, laser anti-counterfeiting uses laser imaging technology for anti-counterfeiting, which is difficult for ordinary consumers to identify. Digital anti-counterfeiting technology is a comprehensive anti-counterfeiting technology integrating computer, network communication and coding, high-tech pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08J5/18G02B1/00G02B5/18G09F3/00G09F3/02
CPCC08J5/18G02B1/005G02B5/18G09F3/02G09F3/0294C08J2329/04
Inventor 邱丽莉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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