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Rare earth upconversion luminous printing ink for screen printing, and preparation method and anti-counterfeiting application thereof

A rare earth up-conversion and rare earth salt technology, which is applied in the field of anti-counterfeiting and printing, can solve the problems of inability to synthesize large quantities of water-soluble particles, poor dispersibility, and high operating temperature, so as to increase the performance of anti-counterfeiting, widen the scope of application, and make it difficult to copy effect

Inactive Publication Date: 2016-08-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to synthesize β-NaYF with low cost and large quantities 4 Up-conversion of luminescent particles and successful preparation of inks that are well-printed on the surface of the substrate are the main reasons that limit its use in anti-counterfeiting printing
[0003] At present, the preparation methods of rare earth up-conversion particles mainly include solvothermal method, thermal decomposition method, co-precipitation method, etc., but the operating temperature of these methods is too high, the reaction cycle is long, the dispersion is not good, and it is impossible to synthesize large quantities of water-soluble particles. sex particles

Method used

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  • Rare earth upconversion luminous printing ink for screen printing, and preparation method and anti-counterfeiting application thereof
  • Rare earth upconversion luminous printing ink for screen printing, and preparation method and anti-counterfeiting application thereof
  • Rare earth upconversion luminous printing ink for screen printing, and preparation method and anti-counterfeiting application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of rare earth up-conversion materials: Add 2mmol sodium citrate into a 100mL round bottom flask, then add 10mL deionized water and stir; then add 1mmol of rare earth chloride (80% ytterbium chloride, 18% yttrium chloride, 2% thulium chloride) was dissolved in 10mL of water and added to the flask; then 10mL of oleic acid and 5mL of ethylene glycol were added, and finally 1mL of water dissolved with 2.88mmol of sodium chloride and 4mL of 6mmol of ammonium fluoride dissolved therein The water was added, stirred for 30 minutes, then transferred to the reaction kettle, and continued to react in an oven at 180°C for 6 hours to obtain the rare earth up-conversion material β-NaYF 4 :Yb 3+ ,Tm 3+ .

[0023] (2) Preparation of anti-counterfeiting printing ink: the synthesized rare earth up-conversion material is cleaned, and the obtained product is cleaned more than 3 times by centrifugation at a speed of 5000rbm for 5 minutes by ethanol, and then dispersed in e...

Embodiment 2

[0026] (1) Preparation of rare earth up-conversion materials: Add 2mmol sodium citrate into a 100mL round bottom flask, then add 10mL deionized water and stir; then add 1mmol of rare earth chloride (80% ytterbium chloride, 18% yttrium chloride, 2% europium chloride) was dissolved in 10mL of water and added to the flask; then 10mL of oleic acid and 5mL of ethylene glycol were added, and finally 1mL of water with 2.88mmol of sodium chloride and 4mL of 6mmol of ammonium fluoride were dissolved Water is added. Stir for 30 minutes, then transfer to a reaction kettle, and continue to react in an oven at 180° C. for 6 hours to obtain a rare earth up-conversion material.

[0027] (2) Preparation of anti-counterfeiting printing ink: the synthesized rare earth up-conversion material is cleaned, and the specific method is: by ethanol, the obtained product is cleaned more than 3 times by centrifugation at a speed of 5000rbm for 5 minutes, and then dispersed in In ethanol, adjust the amou...

Embodiment 3

[0030] (1) Preparation of rare earth up-conversion materials: 2 mmol of sodium citrate was added to a 100 mL round bottom flask, followed by 10 mL of deionized water and stirred. Then 1 mmol of rare earth chloride (80% ytterbium chloride, 18% yttrium chloride, 2% erbium nitrate) was dissolved in 10 mL of water and added to the flask. Then 10 mL of oleic acid and 5 mL of ethylene glycol were added. Finally 1 mL of water dissolved with 2.88 mmol of sodium chloride and 4 mL of water dissolved with 6 mmol of ammonium fluoride were added. Stir for 30 minutes, then transfer to a reaction kettle, and continue to react in an oven at 180° C. for 6 hours to obtain a rare earth up-conversion material.

[0031] (2) Preparation of anti-counterfeiting printing ink: the synthesized rare earth up-conversion material is cleaned, and the specific method is: by ethanol, the obtained product is cleaned more than 3 times by centrifugation at a speed of 5000rbm for 5 minutes, and then dispersed in...

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Abstract

The invention relates to preparation of rare earth upconversion luminous printing ink, and application of the rare earth upconversion luminous printing ink to the field of anti-counterfeiting through a screen printing technology. Through nitrates or chlorides doping with different kinds of rare earth ions, rare earth upconversion luminous printing ink capable of generating different luminous colors under the condition of 980nm laser is prepared. Compared with conventional fluorescent ink, the duplication is difficult; the anti-counterfeiting performance of a printed product is greatly improved. The method has the advantages that the product purification is not needed; high speed and direct viewing are realized; the method belongs to a novel synthesis method with the advantages that the operation is simple, the speed is high; the yield is high. The rare earth upconversion luminous printing ink capable of realizing different luminous colors prepared by the invention can be used for printing different patterns on different substrates through a screen printing plate. The replacement and the supplementation on the conventional anti-counterfeiting technology can be realized; the advantages that the reaction steps are simple, the printed patterns have high stability, and the detection is simple and the like are realized. The patterns can be printed onto bills, trademarks and packaging boxes in batches, so that the printed products after the printing have better anti-counterfeiting functions.

Description

technical field [0001] The invention belongs to the field of printing, and in particular relates to a rare-earth up-conversion luminescent ink and a preparation method thereof and its application in the field of anti-counterfeiting through screen printing technology. Background technique [0002] Rare earth up-conversion luminescent ink is made by adding an up-conversion material (a luminescent material that emits visible light under infrared light excitation) to a transparent system, which cannot be observed with the naked eye. Under excitation, bright fluorescent effects can be observed. The rare earth up-conversion luminescent material can emit short-wave radiation with high energy under the excitation of long-wave radiation with low energy, and is an anti-Stoke luminescent material. Therefore, rare earth up-conversion materials have high-efficiency luminescence performance and highly hidden performance, are difficult to replicate, and are easy to detect, and are widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85C09D11/50C09D11/03G06Q30/00
CPCC09D11/03C09D11/50C09K11/7773C09K11/7791G06Q30/018
Inventor 吴伟
Owner WUHAN UNIV