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Method for producing quantum dot fluorescent anti-counterfeiting paper

The technology of quantum dots and anti-counterfeiting paper is applied in the field of preparation of quantum dot fluorescent anti-counterfeiting paper, which can solve the problems of complicated processes and achieve the effects of strong fluorescence intensity and stable fluorescence anti-counterfeiting effect.

Inactive Publication Date: 2016-06-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods need to prepare quantum dot products in advance, and then further process the paper to combine quantum dots with paper, which is cumbersome.

Method used

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  • Method for producing quantum dot fluorescent anti-counterfeiting paper
  • Method for producing quantum dot fluorescent anti-counterfeiting paper
  • Method for producing quantum dot fluorescent anti-counterfeiting paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Taking the preparation of ZnS quantum dot fluorescent anti-counterfeiting paper as an example, the present invention is further described, and the steps are as follows:

[0036] (1) Add 1mmol sodium sulfide water / ethanol solution dropwise to 1mmoL zinc nitrate water / ethanol solution in magnetic stirring, stir at room temperature for 0-40min until the solution turns milky white, then add 0.03g / mL polyethylene Aqueous imine solution was stirred for a period of time to obtain a reaction mixed suspension.

[0037] (2) Invert the mixed suspension obtained in step (1) into an 80 mL tetrafluoroethylene stainless steel autoclave, and immerse the routine quantitative filter paper in the laboratory into the mixed solution. Put the autoclave in an oil bath at 180°C for 10 hours.

[0038] (3) After the reaction is over, the autoclave is naturally cooled to room temperature, and the product obtained is a slightly yellow composite filter paper, which is washed several times with dei...

Embodiment 2

[0041] Taking the preparation of ZnS quantum dot fluorescent anti-counterfeiting paper as an example, the present invention is further described, and the steps are as follows:

[0042] (1) Add 1mmol sodium sulfide water / ethanol solution dropwise to 1mmoL zinc nitrate water / ethanol solution in magnetic stirring, stir at room temperature for 0-40min until the solution turns milky white, then add 0.03g / mL polyethylene Aqueous imine solution was stirred for a period of time to obtain a reaction mixture suspension.

[0043] (2) Invert the mixed suspension obtained in step (1) into an 80 mL tetrafluoroethylene stainless steel autoclave, and immerse the routine quantitative filter paper in the laboratory into the mixed solution. Put the autoclave in an oil bath at 100°C for 24h.

[0044] (3) After the reaction is over, the autoclave is naturally cooled to room temperature, and the product obtained is a slightly yellow composite filter paper, which is washed several times with deioni...

Embodiment 3

[0047] Taking the preparation of ZnS quantum dot fluorescent anti-counterfeiting paper as an example, the present invention is further described, and the steps are as follows:

[0048] (1) Add 1mmol sodium sulfide water / ethanol solution dropwise to 1mmoL zinc nitrate water / ethanol solution in magnetic stirring, stir at room temperature for 0-40min until the solution turns milky white, then add 0.03g / mL polyethylene Aqueous imine solution was stirred for a period of time to obtain a reaction mixture suspension.

[0049] (2) Invert the mixed suspension obtained in step (1) into an 80 mL tetrafluoroethylene stainless steel autoclave, and immerse the routine quantitative filter paper in the laboratory into the mixed solution. Put the autoclave in an oil bath at 200°C for 8h.

[0050] (3) After the reaction is over, the autoclave is naturally cooled to room temperature, and the product obtained is a slightly yellow composite filter paper, which is washed several times with deioniz...

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Abstract

The invention discloses a method for producing a quantum dot fluorescent anti-counterfeiting paper. The method is a hot pot method, raw materials for generating the quantum dot are uniformly mixed in an aqueous / ethanol solution, then a reaction mixed solution is placed into an autoclave, adding a cellulosic material, in a high-temperature high-pressure reaction, through proper chemical modification, quantum dot can be assembled on the surface of the activated cellulosic material, and the quantum dot fluorescent anti-counterfeiting paper having special fluorescence effect can be obtained through an one-step reaction. The quantum dot fluorescent anti-counterfeiting paper has the advantages that a cellulose structure of the paper can be well kept during a high-temperature high-pressure reaction process, the quantum dot loaded on fiber keeps excellent photoluminescence performance, and the application value of the quantum point can be increased for further. The quantum dot fluorescent anti-counterfeiting paper realizes counterfeiting resistance through fluorescence color by using a conventional ultraviolet lamp and can use a fluorospectrophotometer to test the fluorescence spectrum of the anti-counterfeiting paper, and the anti-counterfeiting intensity can be increased by a concrete value.

Description

technical field [0001] The invention belongs to the technical field of anti-counterfeiting paper preparation, and in particular relates to a preparation method of quantum dot fluorescent anti-counterfeiting paper. Background technique [0002] With the increasingly fierce competition of commodities, anti-counterfeiting technology has developed rapidly, and nano-anti-counterfeiting technology is a popular science and technology in the field of anti-counterfeiting technology. The fluorescent material used for anti-counterfeiting in anti-counterfeiting paper is generally an organic fluorescent material or a lanthanide complex, and its mass fraction in the anti-counterfeiting paper must reach a certain value to obtain a relatively obvious anti-counterfeiting effect, but this will affect the color of the paper itself. Moreover, traditional fluorescent materials are not stable enough, and the excitation and emission cycles are only a few minutes. [0003] Quantum dots, tiny cryst...

Claims

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Application Information

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IPC IPC(8): D21H21/48D21H23/32D21H17/63D21H17/00
CPCD21H17/00D21H17/63D21H21/48D21H23/32
Inventor 李军荣卞喻何北海欧阳灿
Owner SOUTH CHINA UNIV OF TECH
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