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Water-based rare-earth up-conversion fluorescent ink as well as preparation method thereof and anti-counterfeit application

A rare-earth up-conversion and fluorescent ink technology, which is applied in inks, applications, household appliances, etc., can solve the problems of affecting luminous intensity and anti-counterfeiting effect, poor environmental performance of solvent-based inks, and increasing the complexity of process operations, so as to improve anti-counterfeiting Performance, high anti-counterfeiting function, improved operation process and better effect

Active Publication Date: 2018-07-06
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of up-conversion fluorescent ink based on rare earth fluoride is used for packaging anti-counterfeiting. Since the up-conversion material is synthesized by oil / water two-phase, its water dispersibility is not good, and the prepared solvent-based ink has poor environmental performance, and the up-conversion material The surface-capped ligand makes it less compatible with the ink binder, resulting in instability of the anti-counterfeiting ink, easy delamination when placed, and poor printing suitability of the ink, which affects its anti-counterfeiting performance. Conversion of luminescent materials for pre-treatment increases the complexity of process operations
In addition, the three-roll rolling method used in the existing preparation method will easily lead to blackening of the up-conversion material, and the addition of light calcium carbonate will reduce the transparency of the ink system, thereby affecting the luminous intensity and anti-counterfeiting effect

Method used

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  • Water-based rare-earth up-conversion fluorescent ink as well as preparation method thereof and anti-counterfeit application
  • Water-based rare-earth up-conversion fluorescent ink as well as preparation method thereof and anti-counterfeit application
  • Water-based rare-earth up-conversion fluorescent ink as well as preparation method thereof and anti-counterfeit application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) This embodiment provides a preparation method of water-based rare earth up-conversion fluorescent ink, including the following steps:

[0060] S1. Disperse 50 g of water-based polyurethane in 20 mL of water, stir it magnetically for 1 h and let it stand for a certain period of time to form a uniformly dispersed and stable carrier;

[0061] S2. Grinding 20 g of the rare earth up-conversion luminescent material and adding it to the weakly alkaline aqueous solution, stirring until uniformly dispersed;

[0062] S3. Add the aqueous dispersion of the rare earth up-conversion luminescent material dropwise to the aqueous polyurethane dispersion under stirring, pre-disperse on a high-speed mixer for 1 hour, and disperse and homogenize it with a homogenizer for 2 hours;

[0063] S4. Add 0.6 μL of ammonia water, 0.1 g of water-based defoamer and 1.5 mL of ethanol in sequence, stir at high speed for 1 h, adjust the pH of the ink system to 7~8, and the viscosity to 0.5~1.0 Pa·s,...

Embodiment 2

[0072] (1) This embodiment provides a preparation method of water-based rare earth up-conversion fluorescent ink, including the following steps:

[0073] S1. Disperse 30 g of water-based polyurethane in 60 mL of water, stir magnetically for 1 h and then let it stand for a certain period of time to form a uniformly dispersed and stable carrier;

[0074] S2. Grinding 1 g of the rare earth up-conversion luminescent material and adding it to the weakly alkaline aqueous solution, stirring until uniformly dispersed;

[0075] S3. Add the aqueous dispersion of the rare earth up-conversion luminescent material dropwise to the aqueous polyurethane dispersion under stirring, pre-disperse on a high-speed mixer for 1 hour, and disperse and homogenize it with a homogenizer for 1 hour;

[0076] S4. Add 0.4 μL of ammonia water, 0.1 g of water-based defoamer and 1.5 mL of ethanol in sequence, stir at high speed for 1 h, adjust the pH of the ink system to 7~8, and the viscosity to 0.5~1.0 Pa·s,...

Embodiment 3

[0080] (1) This embodiment provides a preparation method of water-based rare earth up-conversion fluorescent ink, including the following steps:

[0081] S1. Disperse 70 g of water-based polyurethane in 20 mL of water, stir it magnetically for 1 h and let it stand for a certain period of time to form a uniformly dispersed and stable carrier;

[0082] S2. Grinding 9 g of the rare earth up-conversion luminescent material, adding it to the weakly alkaline aqueous solution, and stirring until uniformly dispersed;

[0083] S3. Add the aqueous dispersion of the rare earth up-conversion luminescent material dropwise into the aqueous polyurethane dispersion under stirring, pre-disperse on the high-speed mixer for 1 hour, and disperse and homogenize it with a homogenizer for 1.5 hours;

[0084] S4. Add 0.5 μL of ammonia water, 0.1 g of water-based defoamer and 1.5 mL of ethanol in sequence, stir at high speed for 1 h, adjust the pH of the ink system to 7~8, and the viscosity to 0.5~1.0...

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Abstract

The invention relates to the technical field of anti-counterfeit printing, and discloses a preparation method of water-based rare-earth up-conversion fluorescent ink. The method takes water-based polyurethane (WPU) prepolymer as an organic ligand; types of doped rare-earth ions are changed, and a hydro-thermal synthesis method is adopted for obtaining a water-based rare-earth fluoride up-conversion light-emitting material with high light-emitting strength; the water-based rare-earth fluoride up-conversion light-emitting material is added into an ink system, water-based polyurethane is taken asa connecting material, water is taken as a dispersing medium, and the water-based rare-earth up-conversion ink is prepared through processes such as pre-dispersing, high-speed stirring and homogenizing; and a needed pattern is obtained on printing stock through a sealing or concave-sealing mode. The water-based rare-earth up-conversion fluorescent ink prepared by the method disclosed by the invention has the advantages of good environment friendliness, strong anti-counterfeit capability grade, high light-emitting strength, good printability, capability of showing various printings tock materials, simple operation, short period, and the like, and can be printed on bills, negotiable securities, trade marks or packages on a large scale, so that a product has a relatively high anti-counterfeit function.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting printing, and more specifically, relates to a water-based rare earth up-conversion fluorescent ink, a preparation method thereof, and an anti-counterfeiting application. Background technique [0002] The repeated prohibition of counterfeit and shoddy goods has disrupted the normal market order and seriously jeopardized the legitimate rights and interests of enterprises and consumers. The close combination of anti-counterfeiting technology and printing technology is of great significance for combating counterfeit and shoddy products and regulating market order. In recent years, the government has gradually imposed stricter regulations on VOC emissions, and the call for environmental protection has been increasing. Therefore, the development of environmentally friendly anti-counterfeiting materials has important market value. [0003] Rare earth up-conversion luminescent inks are made b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/50C09D11/102C09D11/03B41M3/14
CPCB41M3/144C09D11/03C09D11/102C09D11/50
Inventor 杨玲刘跃军王正祥钟云飞徐军
Owner HUNAN UNIV OF TECH
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