Waterborne fluorescent falsification-resistant ink and preparation method thereof

An anti-counterfeiting ink and fluorescence technology, applied in the field of ink, can solve the problems of low color purity, complex preparation process, toxicity, etc., and achieve the effects of high photochemical stability, broad development prospects, and high fluorescence intensity.

Inactive Publication Date: 2013-05-01
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a functional ink, fluorescent anti-counterfeiting ink has achieved great development and general application, but most of the fluorescent anti-counterfeiting agents produced and used at present are organic fluorescent materials or organic rare earth metal fluorescent complexes, so there are the following shortcomings and deficiencies: 1) The preparation process is generally complicated, the production cost is relatively high, and the product stability is poor. 2) It is generally toxic and its toxicological effect is unknown. 3) It is generally difficult to adapt to water-based inks, and solvent-based inks are harmful to producers and users. There are certain hazards to health and the environment, which is inconsistent with the current development trend of inks. 4) The emitted fluorescence is generally broad-spectrum, so the color purity is relatively low. 5) The fluorescence intensity decays quickly after being placed for a long time

Method used

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  • Waterborne fluorescent falsification-resistant ink and preparation method thereof
  • Waterborne fluorescent falsification-resistant ink and preparation method thereof
  • Waterborne fluorescent falsification-resistant ink and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Preparation of ZnS:Mn / ZnS quantum dots according to literature

[0016] (1) Put 5ml, 0.1mol / L zinc sulfate, 2ml, 0.01mol / L manganese chloride, 20ml, 0.1mol / L mercaptopropionic acid and 5ml, 0.1mol / L sodium sulfide in a container with N 2 Protect the reaction, the reaction temperature is room temperature 25°C, the reaction time is 30min, the obtained reaction solution is aged in the air atmosphere for 2 hours, the aging temperature is 50°C, then settled with absolute ethanol, centrifuged at high speed, and vacuum dried Obtain ZnS:Mn quantum dot solid powder.

[0017] (2) Dilute 10ml, 0.1mol / L zinc sulfate solution and 15ml, 0.1mol / L mercaptopropionic acid solution to 98ml with water, adjust the pH to 10 with 40g / L sodium hydroxide solution, and use N 2 Saturation for 30min, the mercaptopropionic acid-zinc ion complex was obtained.

[0018] (3) Dissolve the ZnS:Mn quantum dot solid powder obtained in step (1) with water to obtain 50ml of ZnS:Mn quantum dot aq...

Embodiment 2

[0019] Embodiment 2: Preparation of water-based fluorescent anti-counterfeiting ink

[0020] Dissolve the ZnS:Mn / ZnS quantum dot synthesized by 5g embodiment 1 with 8ml water, add 15g n-butanol, stir well, then add 0.6g sodium dodecylbenzenesulfonate, 0.3g defoamer SP-23 and 0.3g sodium polyacrylate, continue to stir for 50 minutes, add 70ml of water, stir for 30 minutes, and let stand for 1 hour to obtain a colorless water-based fluorescent anti-counterfeiting ink. Use the Cary Eclipse fluorescence spectrophotometer test to obtain the fluorescence spectrum of the ink, see figure 2 Curve b, the maximum emission wavelength of the ink is 597nm, which is consistent with the maximum emission wavelength of the ZnS:Mn / ZnS quantum dot aqueous solution. The ink is colorless under natural light conditions, see image 3 (a); reddish-orange under ultraviolet light, see image 3 (b).

[0021] The prepared ink was coated on a glass plate, it was colorless under natural light condition...

Embodiment 3

[0022] Example 3: Preparation of quantum dot water-based fluorescent anti-counterfeiting ink

[0023] Use 4ml to dissolve the ZnS:Mn / ZnS quantum dot synthesized by 2.5g embodiment 1, add 5g n-butanol, stir well, then add 0.2g sodium dodecylbenzenesulfonate, 0.1g defoamer SP-23 and 0.1g of sodium polyacrylate, continue to stir for 30 minutes, add 13ml of water, stir for 20 minutes, and let stand for 1 hour to obtain a colorless water-based fluorescent anti-counterfeiting ink.

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Abstract

The invention provides application of Mn-doped core-shell structure zinc sulfide quantum dot ZnS:Mn/Zn taken as fluorescent security agent, as well as waterborne fluorescent falsification-resistant ink and a preparation method of the waterborne fluorescent falsification-resistant ink. The waterborne fluorescent falsification-resistant ink comprises the following raw materials in percentage by weight: 15-20 percent of n-butanol, 5-10 percent of ZnS:Mn/ZnS quantum dot, 0.5-1 percent of sodium dodecyl benzene sulfonate, 0.1-0.5 percent of foam killer SP-23, 0.1-0.5 percent of polyacrylate sodium, and water in balancing amount. The waterborne fluorescent falsification-resistant ink is colourless under the natural condition while can give out a blood orange light under the radiation of ultraviolet light. In addition, the main components of the waterborne fluorescent falsification-resistant ink comprise alcohol and the waterborne quantum dot, ink additive and less additives, water is the solvent, and the pollution is less, so that the environmental-friendly fluorescent falsification-resistant ink caters for the development trend of fluorescent falsification-resistant ink in the future, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of printing inks, and more specifically relates to a novel fluorescent anti-counterfeiting agent and water-based fluorescent anti-counterfeiting ink prepared therefrom. Background technique [0002] As a functional ink, fluorescent anti-counterfeiting ink has achieved great development and general application, but most of the fluorescent anti-counterfeiting agents produced and used at present are organic fluorescent materials or organic rare earth metal fluorescent complexes, so there are the following shortcomings and deficiencies: 1) The preparation process is generally complicated, the production cost is relatively high, and the product stability is poor. 2) It is generally toxic and its toxicological effect is unknown. 3) It is generally difficult to adapt to water-based inks, and solvent-based inks are harmful to producers and users. There are certain hazards to health and the environment, which is inco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/02C09D11/50
Inventor 董川王眉花游志校苏丽霞
Owner SHANXI UNIV
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