A preparation method of red, green and blue trichromatic orthogonal up-conversion fluorescent security ink

A technology of three primary colors, red, green and blue, applied in chemical instruments and methods, inks, luminescent materials, etc., can solve the problems of lack of effective information protection, unsatisfactory information protection, and low anti-counterfeiting performance in anti-counterfeiting patterns, so as to avoid background fluorescence interference. , the effect of increasing the technical difficulty and improving the level

Active Publication Date: 2021-09-24
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of fluorescent anti-counterfeiting ink based on single-stage anti-counterfeiting technology can be replaced by luminescent materials with similar emission characteristics, resulting in the lack of effective protection of information in the anti-counterfeiting pattern, making it unsatisfactory in information protection, low anti-counterfeiting performance, and easy to be detected. counterfeit

Method used

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  • A preparation method of red, green and blue trichromatic orthogonal up-conversion fluorescent security ink
  • A preparation method of red, green and blue trichromatic orthogonal up-conversion fluorescent security ink
  • A preparation method of red, green and blue trichromatic orthogonal up-conversion fluorescent security ink

Examples

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Embodiment 1

[0029] The preparation method of trichromatic orthogonal luminescent five-layer core-shell structure nanoparticles, the specific steps are as follows:

[0030] (1)NaYF 4 : Synthesis of Yb / Tm core nanoparticles. Take a 50mL two-necked round-bottomed flask as a reaction vessel, and a total amount of 0.4mmol of Y(CH 3 COO) 3 (69.5%), Yb(CH 3 COO) 3 (30%) and Tm(CH 3 COO) 3 (0.5%) aqueous solution was added with 3 mL of oleic acid and 7 mL of octadecene, and the resulting mixture was stirred at 150° C. for 60 minutes to remove water and low-boiling solvent molecules to form an oleic acid complex precursor. After cooling the resulting mixture to room temperature, 4 mL of NH 4 F (0.4moL / L) and 2mL NaOH (0.5moL / L) in methanol solution, heated to 50°C and continuously stirred for 30 minutes, then heated to 100°C and kept under vacuum for 10 minutes to remove methanol, then inert gas Under protection, the temperature was raised to 290° C. for 90 minutes. After the reaction was...

Embodiment 2

[0036] Example 2: Preparation of hydrophilic trichromatic orthogonal luminescent five-layer core-shell nanoparticle.

[0037] Disperse the trichromatic orthogonal luminescent nanoparticles wrapped by oleic acid into a mixed solution of 1ml ethanol and 1ml hydrochloric acid (2M), and then centrifuge at a speed of 16000r / min for 20min to remove the oleic acid ligands on the surface of the nanoparticles to obtain The ligand-free nanoparticles on the surface were washed twice with ethanol and finally redispersed in deionized water.

Embodiment 3

[0038] Embodiment 3: Preparation of acid-base indicator thymolphthalein solution. Weigh 0.1 g of thymolphthalein, dissolve it in 100 ml of ethanol with a volume fraction of 90%, and wait until it is completely dissolved by ultrasonication.

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Abstract

The invention discloses a preparation method of red, green and blue trichromatic orthogonal up-conversion fluorescent safety ink, which belongs to the field of nanometer optical anti-counterfeiting technology. Nanoparticles with red, green and blue orthogonal up-conversion luminescence, and then the obtained nanoparticles are surface treated to obtain water-soluble nanoparticles, and finally the water-soluble nanoparticles are added to the acid-base indicator in a certain proportion, and the ultrasonic dispersion is uniform Get the security ink. The security ink prepared by the method can obtain anti-counterfeiting patterns through printing, stamping, inkjet printing and handwriting, etc. The pattern obtained by the security ink has the characteristics of three-color fluorescent display, pH stimulus responsiveness and good stability, and can be used in multi-level Anti-counterfeiting applications.

Description

technical field [0001] The invention relates to a preparation method of red, green and blue trichromatic orthogonal up-conversion fluorescent security ink, which belongs to the technical field of nano optical anti-counterfeiting. Background technique [0002] Information security has become an important issue in today's society. Therefore, anti-counterfeiting technology is playing an increasingly important role in politics, economy, military fields and our daily life. According to statistics, in the past few decades, governments and companies around the world have spent tens of millions of dollars on research and development of information protection and anti-counterfeiting technologies. Various anti-counterfeiting technologies, including fluorescent anti-counterfeiting, nuclear track anti-counterfeiting, laser holographic anti-counterfeiting and magnetic anti-counterfeiting, have been widely used in currency, labels and important documents. Among them, due to the advantage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/50C09K11/85C09K11/02
CPCC09D11/50C09K11/02C09K11/7773
Inventor 秦伟平贾恒李大光崔皓秦冠仕赵丹尹升燕狄卫华贾志旭
Owner JILIN UNIV
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