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ZnO quantum dot and anti-counterfeit ink and security file prepared by using ZnO quantum dot

The technology of anti-counterfeiting ink and quantum dots is applied in the field of anti-counterfeiting, which can solve the problems of impure chromaticity, reduce the difficulty of counterfeiting, unfavorable machine-readable identification, etc., and achieve the effects of simple preparation method, improved anti-counterfeiting performance, and no color appearance in appearance.

Inactive Publication Date: 2017-08-18
SHANGHAI BANKNOTE PRINTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantages are also very obvious. The traditional fluorescent materials have a wide half-peak width of the fluorescence emission peak, and the chromaticity is impure, which is easy to be imitated by color matching, and the wide half-peak width is not conducive to machine-readable identification; a single fluorescent material is easy to be Identification; moreover, fluorescent materials of various colors are easy to purchase and prepare, which greatly reduces the difficulty of counterfeiting, which reduces its anti-counterfeiting function

Method used

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  • ZnO quantum dot and anti-counterfeit ink and security file prepared by using ZnO quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 10g of zinc acetate and 1000ml of DMF solution, stir at 25°C for 10min to dissolve the zinc acetate, then increase the reaction temperature to 90°C and keep it for 5 hours to obtain white ZnO quantum dot precipitates. After centrifugation and drying at 50° C. for 2 hours, about 3 g of ZnO quantum dot white powder was obtained.

[0020] Take 3g of the above-mentioned quantum dot powder and 7g of offset printing base ink and mix to prepare an offset printing ink containing quantum dots.

[0021] The above-mentioned offset printing ink is printed into a specific pattern to form a security document. This security document is colorless under natural light, and has no color in appearance under the excitation light of 325nm. The visible area forms a fluorescent emission peak with a half-peak width less than 50nm, which is different from any current fluorescent material, thereby forming an anti-counterfeiting effect.

Embodiment 2

[0023] Take 10g of zinc acetate and 900ml of DMF solution, stir at 30°C for 30min to dissolve the zinc acetate, then increase the reaction temperature to 95°C and keep it for 8 hours to obtain white ZnO quantum dot precipitates. After centrifugation and drying at 50° C. for 2 hours, about 3 g of ZnO quantum dot white powder was obtained.

[0024] Take 3g of the above-mentioned quantum dot powder and 7g of offset printing red fluorescent base ink and mix to prepare an offset printing ink containing quantum dots.

[0025] Print the above-mentioned offset printing ink into a specific pattern to form a security document. This security document is colorless under natural light. Under the excitation light of 325nm, it does not show red fluorescence in appearance. At the same time, a fluorescent emission peak with a half-peak width less than 50nm is formed in the ultraviolet invisible region around 380nm, which is different from any current fluorescent material, thus forming an anti-...

Embodiment 3

[0027] Take 20g of zinc acetate and 2200ml of DMF solution, stir at 35°C for 20min to dissolve the zinc acetate, then increase the reaction temperature to 105°C and keep it for 10 hours to obtain white ZnO quantum dot precipitates. After centrifugation and drying at 50° C. for 2 hours, about 6 g of ZnO quantum dot white powder was obtained.

[0028] Take 3g of the above-mentioned quantum dot powder and 7g of offset printing varnish or color paste to make offset printing ink containing quantum dots. figure 1 The fluorescent effect shown can be effectively distinguished from traditional fluorescent inks.

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PUM

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Abstract

The invention provides a ZnO quantum dot and anti-counterfeit ink and security file prepared by using the ZnO quantum dot. The ZnO quantum dot is obtained through one-step reaction of zinc acetate and DMF as raw materials under a heating condition; and the prepared ZnO quantum dot forms a fluorescence emission peak of which the half peak width is smaller than 50nm in an ultraviolet invisible region of about 380nm under exciting light of 325nm. According to the anti-counterfeit ink prepared by adding the ZnO quantum dot to base ink for printing to roll, a special emission peak of the ultraviolet invisible region is added under the condition of not affecting the anti-counterfeiting performance of the base ink, and the anti-counterfeiting performance is strengthened. The anti-counterfeit ink can be used for printing to prepare the security file, so that the anti-counterfeiting performance of the security file is strengthened.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting, in particular to a preparation method of ZnO quantum dots, an anti-counterfeiting ink and a security document printed using the anti-counterfeiting ink. Background technique [0002] In the current anti-counterfeiting field, fluorescent anti-counterfeiting ink is widely used in banknotes, passports, stamps, valuable banknotes and various anti-counterfeiting labels as a very important anti-counterfeiting element because of its anti-counterfeiting concealment and printability. The fluorescent material in the current fluorescent ink is mostly organic fuel or fluorescent powder, and its advantage is that when the proportion of fluorescent material in the ink is high, the fluorescent brightness is brighter under the ultraviolet lamp. And with the rapid development of fluorescent materials, the fluorescent emission region can extend from the visible region to the infrared region. But its d...

Claims

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Application Information

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IPC IPC(8): C09K11/54B82Y20/00C09D11/50B42D25/387
CPCC09K11/54B42D25/387B82Y20/00C09D11/50
Inventor 施周吴旺宝郭界陆泰伟金劼
Owner SHANGHAI BANKNOTE PRINTING
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