Carbon quantum dot fluorescent anti-forgery ink as well as preparation method and application thereof

The technology of carbon quantum dots and anti-counterfeiting ink is applied in the field of carbon quantum dot fluorescent anti-counterfeiting ink and its preparation, which can solve the problems that the fluorescent pattern cannot be arbitrarily set, the phenomenon of phase separation is easy to occur, and the anti-counterfeiting effect is lost, and the anti-counterfeiting effect is strong and the anti-counterfeiting effect is lost. Strong fluorescence and stability, good printability

Pending Publication Date: 2022-07-15
ANHUI ANTAI NEW PACKAGE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the conventional carbon quantum dot solution has poor adhesion on the fiber paper base, is prone to phase separation and loses the anti-counterfeiting effect, a

Method used

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  • Carbon quantum dot fluorescent anti-forgery ink as well as preparation method and application thereof
  • Carbon quantum dot fluorescent anti-forgery ink as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of carbon quantum dot fluorescent anti-counterfeiting ink, specifically comprising the following steps:

[0039] 1) Weigh 1g of anhydrous citric acid, 1ml of diethylenetriamine, and 2g of acrylamide to dissolve in 30ml of deionized water, and ultrasonically disperse for 20min under 80W power to obtain a mixed solution, and then put the mixed solution into the stainless steel of the PTFE liner The reaction kettle was placed in an oven at 180° C. for hydrothermal reaction for 6 hours. After the reaction was completed, it was naturally cooled to room temperature, and then the reaction kettle was taken out to obtain a carbon quantum dot solution.

[0040] 2) Transfer the carbon quantum dot solution in the reaction kettle to a centrifuge tube, centrifuge at 8000 r / min for 15 minutes, and then take out the supernatant. The dialysis bag with a molecular weight cut-off of 1000 Da was soaked in deionized water for 10 minutes, and the supernatant obtained by ...

Embodiment 2

[0045] A preparation method of carbon quantum dot fluorescent anti-counterfeiting ink, specifically comprising the following steps:

[0046]1) Weigh 1g of anhydrous citric acid, 1ml of diethylenetriamine, and 2g of acrylamide to dissolve in 30ml of deionized water, ultrasonically disperse for 20min under 80W power to obtain a mixed solution, and then put the mixed solution into the stainless steel of the PTFE liner The reaction kettle was placed in an oven at 180° C. for hydrothermal reaction for 4 hours. After the reaction was completed, it was naturally cooled to room temperature, and then the reaction kettle was taken out to obtain a carbon quantum dot solution.

[0047] 2) Transfer the carbon quantum dot solution in the reaction kettle to a centrifuge tube, centrifuge for 15 minutes at a rotational speed of 8000 r / min, and then take out the supernatant. The dialysis bag with a molecular weight cut-off of 1000 Da was soaked in deionized water for 10 minutes, and the superna...

Embodiment 3

[0052] The present embodiment prepares the carbon quantum dot fluorescent anti-counterfeiting ink according to the following steps:

[0053] 1) Weigh 1g of anhydrous citric acid, 1ml of diethylenetriamine, and 2g of acrylamide to dissolve in 30ml of deionized water, ultrasonically disperse for 20min under 80W power to obtain a mixed solution, and then put the mixed solution into the stainless steel of the PTFE liner The reaction kettle was placed in an oven at 180° C. for hydrothermal reaction for 8 hours. After the reaction was completed, it was naturally cooled to room temperature, and then the reaction kettle was taken out to obtain a carbon quantum dot solution.

[0054] 2) Transfer the carbon quantum dot solution in the reaction kettle to a centrifuge tube, centrifuge for 15 minutes at a rotational speed of 8000 r / min, and then take out the supernatant. The dialysis bag with a molecular weight cut-off of 1000 Da was soaked in deionized water for 10 minutes, and the supern...

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Abstract

The invention belongs to the technical field of fluorescent ink, and particularly relates to carbon quantum dot fluorescent anti-forgery ink as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) weighing anhydrous citric acid, diethylenetriamine and acrylamide, adding deionized water, and carrying out ultrasonic mixing; (2) transferring the solution into a reaction kettle for hydrothermal reaction, and naturally cooling to room temperature; and (3) carrying out centrifugal treatment on a product obtained in the step (2), taking supernate, and dialyzing to obtain a fluorescent carbon quantum dot solution. And freeze-drying to obtain solid powder, and dispersing the solid powder in an aqueous solution to prepare the fluorescent ink. The raw material acrylamide can generate polyacrylamide (PAM) with thickening property and surface activity, so that the liquid surface tension is reduced, the printability of the carbon quantum dot fluorescent ink on a fiber paper base is good, patterning is realized through an ink-jet printing technology, the prepared anti-counterfeiting pattern is good in stability, and the anti-counterfeiting effect is good. The method can be well applied to the field of tobacco anti-counterfeiting packaging.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting materials, in particular to a carbon quantum dot fluorescent anti-counterfeiting ink and a preparation method and application thereof. Background technique [0002] Counterfeiting is a pervasive problem that poses a threat to individuals and society. It can have a significant negative impact on the public and even worsen economic growth through the circulation of illegal or counterfeit goods, documents and currencies. As a result, counterfeiting can have serious environmental, health, economic and social impacts. [0003] Fluorescent printing technology based on anti-counterfeiting ink is widely used in anti-counterfeiting. Common fluorescent substances include organic luminescent dyes, semiconductor quantum dots, and rare earth luminescent materials. However, the preparation process of these materials is complicated and the post-processing is cumbersome, and the semiconductor quantu...

Claims

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Application Information

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IPC IPC(8): C09D11/50C09D11/03B82Y20/00B82Y40/00C09K11/65
CPCC09D11/50C09D11/03C09K11/65B82Y20/00B82Y40/00
Inventor 朱国良许涛曹青
Owner ANHUI ANTAI NEW PACKAGE MATERIAL
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