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A kind of quantum dot fluorescent anti-counterfeiting paper and its manufacturing method

A technology of quantum dots and anti-counterfeiting paper, applied in the field of anti-counterfeiting paper preparation, can solve the problems of only a few minutes of excitation and emission period, easy overlapping of emission spectra, insufficient stability of fluorescent molecules, etc., and achieves good photochemical stability and stable fluorescence anti-counterfeiting effect. , the effect of good first-line anti-counterfeiting features and second-line anti-counterfeiting features

Active Publication Date: 2015-08-12
BAODING BANKNOTE PAPER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, in the anti-counterfeiting paper containing fluorescent materials, most of the fluorescent materials are coated on the surface of the paper or mixed with ink to print on the paper surface, so that certain areas or special positions of the paper have fluorescent effects, but this anti-counterfeiting effect easier to imitate
Moreover, different fluorescent dye molecules need different wavelengths of excitation light to be excited, and the excitation spectrum is narrow, and the emission spectrum is wide. The emission spectra of fluorescent molecules of different colors are easy to overlap with each other, so it is difficult to use more than two kinds of fluorescence at the same time. mark
Moreover, traditional dye fluorescent molecules are not stable enough, and their excitation and emission cycles are generally only a few minutes

Method used

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  • A kind of quantum dot fluorescent anti-counterfeiting paper and its manufacturing method
  • A kind of quantum dot fluorescent anti-counterfeiting paper and its manufacturing method
  • A kind of quantum dot fluorescent anti-counterfeiting paper and its manufacturing method

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Embodiment 1

[0039] This embodiment provides a quantum dot fluorescent anti-counterfeiting paper, which is prepared through the following steps:

[0040]1. Process the cotton fiber into a length of 1mm-3mm, soak it into the quantum dot fluorescent material solution with a concentration of 2-5mg / mL for physical penetration, and control the soaking time for 15-30min. The quantum dot is based on CdSe as the core and ZnS is a core-shell structure nanobody with a shell size of 5nm, and the emitted light is yellow-green fluorescence with a wavelength of 520nm;

[0041] 2. After the quantum dot fluorescent material has fully penetrated into the cotton fiber, take it out for use;

[0042] 3. In the process of papermaking, in the blending process, the cotton fibers infiltrated with quantum dot fluorescent materials are evenly dispersed in the pulp according to the ratio of 0.1%-0.2% of dry pulp (the process flow is as follows: figure 1 shown), uniformly and randomly applied to wet paper sheets, so...

Embodiment 2

[0051] This embodiment provides a quantum dot fluorescent anti-counterfeiting paper, which is prepared through the following steps:

[0052] 1. Process the cotton fiber into a length of 1mm-3mm, soak it into the solution of the first quantum dot fluorescent material with a quantum dot concentration of 2mg / mL in chloroform for physical infiltration, and control the soaking time to 15-30min. The quantum dot is based on The core-shell structure nanobody with CdSe as the core and ZnS as the shell has a size of 5nm and emits yellow-green fluorescence with a wavelength of 520nm;

[0053] 2. After the first quantum dot fluorescent material has completely penetrated into the cotton fiber, take it out, and then soak it into the second quantum dot fluorescent material solution with a quantum dot concentration of 5 mg / mL in toluene solution for physical infiltration. Quantum dots are nanobodies with a core-shell structure with CdSe as the core and ZnS as the shell. The size is 7nm, and t...

Embodiment 3

[0062] 1. Soak the polyvinyl alcohol film with a thickness of 30-100 μm (the area of ​​the film has no clear requirements, it can be determined according to the amount of quantum dots and the size of the dyeing container, and the polyvinyl alcohol film can be reprocessed according to requirements after application) Physically infiltrate into the toluene solution of quantum dot fluorescent materials with a quantum dot concentration of 2-10mg / mL, and the soaking time is controlled at 15-30min. The quantum dot is a core-shell nanobody with CdSe as the core and ZnS as the shell. , the size is 5nm, and the emitted light is yellow-green fluorescence with a wavelength of 520nm;

[0063] 2. After the quantum dot fluorescent material has completely penetrated into the interior of the polyvinyl alcohol film, take it out, cut it into a predetermined shape, and set it aside;

[0064] 3. In the process of paper making, first make a layer of wet paper, and apply a polyvinyl alcohol film cut...

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Abstract

The invention relates to a quantum dot fluorescent anti-counterfeiting paper and a manufacturing method thereof. The invention first provides the quantum dot fluorescent anti-counterfeiting paper, which contains quantum dots. The invention further provides the manufacturing method of the quantum dot fluorescent anti-counterfeiting pape; and the method comprises the following steps of: compounding the quantum dots into a carrier material; and in the papermaking process, adding the carrier material compounded with the quantum dots to the paper, so as to obtain the quantum dot fluorescent anti-counterfeiting paper. According to the invention, the application of a quantum dot fluorescent material in counterfeiting prevention of papers has the advantages of advanced technology, strong anti-counterfeiting capacity, large counterfeiting difficulty and so on. Through the adoption of the quantum dot fluorescent anti-counterfeiting paper provided by the invention, public identification counterfeiting prevention can be achieved by using a visible fluorescence color of a common fluorescent ultraviolet lamp and spectral analysis can be also carried out on the paper by using a fluorospectro photometer so as to achieve machine readable counterfeiting prevention, so that the anti-counterfeiting level of the paper is increased.

Description

technical field [0001] The invention relates to an anti-counterfeiting paper and a manufacturing method thereof, in particular to a quantum dot fluorescent anti-counterfeiting paper and a manufacturing method thereof, and belongs to the technical field of anti-counterfeiting paper preparation. Background technique [0002] Fluorescent effect is one of the commonly used anti-counterfeiting effects in the field of anti-counterfeiting, and it is also widely used in anti-counterfeiting paper. The fluorescent materials used in anti-counterfeiting paper are generally traditional organic fluorescent dyes or lanthanide complexes. [0003] At present, in the anti-counterfeiting paper containing fluorescent materials, most of the fluorescent materials are coated on the surface of the paper or mixed with ink to print on the paper surface, so that certain areas or special positions of the paper have fluorescent effects, but this anti-counterfeiting effect easier to imitate. Moreover, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/48
Inventor 刘永红曹秀痕朱西赏李兵吴梅竹
Owner BAODING BANKNOTE PAPER CO LTD
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