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Anti-fake material composition based on fluorescent quantum dots and use method thereof

A technology of fluorescent quantum dots and components, applied in optics, polyether coatings, polyester coatings, etc., can solve the problems of easy oxidation and decomposition, complex production process, heavy pollution, etc., and achieve good biocompatibility and stable fluorescence performance Effect

Inactive Publication Date: 2016-07-20
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, organic fluorescent materials are generally unsaturated molecules with a wide range of conjugated bodies. Due to the instability of unsaturated molecules, they are easy to oxidize and decompose, resulting in poor photostability of the material and toxic effects on organisms. The production process is complicated and the cost higher
Inorganic fluorescent materials, such as phosphorous powder, are mostly difficult to dissolve in the organic phase, have poor water resistance, have a certain degree of wear and erosion on packaging materials, and are mostly toxic, and the pollution in the production process is heavy.
[0003] At the same time, the current anti-counterfeiting label often adopts the method of product surface printing, that is, paper fluorescent anti-counterfeiting, and the printing ink used has a certain color. In order to improve the appearance of the product, manufacturers have to choose paper with the same color as the base state of the fluorescent substance. As an outer packaging material, it greatly limits the beauty and design flexibility of the product

Method used

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  • Anti-fake material composition based on fluorescent quantum dots and use method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Dissolve 0.8g graphene oxide in 30mL N,N-dimethylformamide, and disperse evenly by ultrasonic. The dispersion was transferred to a polytetrafluoroethylene reactor and reacted at 200° C. for 7 hours. After cooling to room temperature, a black viscous substance was obtained, which was centrifuged, and the upper layer of light brown supernatant was taken, filtered through a 0.22 μm nylon-66 membrane to obtain light brown clear and transparent quantum dot N,N-dimethylformazan Amide dispersion. The solid quantum dots are obtained through a rotary evaporation process. The average diameter of the obtained quantum dots is 20nm, the maximum excitation wavelength is 420nm, and the maximum emission wavelength is 510nm.

[0025] Add 0.1 mg of solid quantum dots to 0.20 mL of acetone, ultrasonically disperse evenly, and then add the dispersion liquid dropwise to 0.50 g of acrylate low-viscosity resin CN294E, 0.50 g of butyl acrylate, 0.30 g of neopentyl glycol diacrylate and In t...

Embodiment 2

[0027] Dissolve 1 g of multi-walled carbon nanotubes in 100 mL of N,N-dimethylformamide, then add 2 g of oxidant potassium persulfate, and disperse evenly by ultrasonication. The dispersion liquid was transferred to a polytetrafluoroethylene reactor, and reacted at 200° C. for 10 h. After cooling to room temperature, a black suspension was obtained. After filtering with a 0.22 μm nylon-66 membrane, the obtained product was dialyzed with a 2000 Dalton dialysis bag to remove small molecular impurities to obtain a light yellow quantum dot N,N-dimethylformamide dispersion. The solid quantum dots are obtained through a rotary evaporation process. The average diameter of the obtained quantum dots is 5 nm, the maximum excitation wavelength is 360 nm, and the maximum emission wavelength is 430 nm.

[0028] Add 0.20mg of solid quantum dots to 0.40mL of acetone, ultrasonically disperse evenly, and then add the dispersion dropwise to 0.80g of acrylate low-viscosity resin CN294E, 1.00g ...

Embodiment 3

[0030]Dissolve 1.1 g of ascorbic acid in 25 mL of deionized water, add 25 mL of ethanol while stirring, ultrasonically disperse evenly, transfer the dispersion to a polytetrafluoroethylene reactor, and react at 180°C for 4 hours. After cooling to room temperature, the product was obtained as a dark brown solution. The solution product is extracted with dichloromethane, and the extracted water phase is dialyzed with an 8000-14000 Dalton dialysis bag to remove small molecule impurities and obtain a light yellow quantum dot aqueous phase dispersion. Solid carbon quantum dots are obtained through a rotary evaporation process. The obtained carbon quantum dot has an average spherical diameter of 30nm, a maximum excitation wavelength of 370nm, and a maximum emission wavelength of 550nm.

[0031] Add 0.20mg of solid carbon quantum dots to 0.5mL of acetone, ultrasonically disperse evenly, and then add the dispersion dropwise to 1.00g of acrylate low-viscosity resin CNEB81, 1.20g of hy...

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Abstract

The invention relates to an anti-fake material composition based on fluorescent quantum dots and a use method thereof.The use method includes the steps that small organic molecule or carbon materials serve as a carbon source, carbon quantum dots with fluorescence are prepared with a solvothermal method and then mixed with light-cured resin and light activity monomers, a pre-designed colorless transparent pattern can be obtained in a specific area of a base material through the steps of silk-screen printing, nanometer embossing, mask adding exposing and the like, and specific fluorescence can be displayed under excitation of light with certain wavelength and can be used for anti-fake labels.According to the anti-fake material composition and the use method, the preparing process is simple, preparing cost is low, environmentally-friendly and nontoxic effects are achieved, biocompatibility is good, the novel anti-fake material stable in fluorescence property can be obtained, and the broad application prospects are achieved.

Description

technical field [0001] The invention relates to an anti-counterfeiting material composition based on fluorescent quantum dots and a method for using the same. Background technique [0002] With the development of science and technology and the improvement of safety awareness, people have higher and higher requirements for anti-counterfeiting materials. At present, anti-counterfeiting materials are mainly divided into two categories: organic fluorescent materials and inorganic fluorescent materials. Among them, organic fluorescent materials are generally unsaturated molecules with a wide range of conjugated bodies. Due to the instability of unsaturated molecules, they are easy to oxidize and decompose, resulting in poor photostability of the material and toxic effects on organisms. The production process is complicated and the cost higher. Inorganic fluorescent materials, such as phosphorous powder, are mostly difficult to dissolve in the organic phase, have poor water resi...

Claims

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Application Information

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IPC IPC(8): C09D163/10C09D175/14C09D167/06C09D171/00C09D4/02C09D7/12G03F7/027
CPCC09D4/06C09D7/61C08F265/06
Inventor 魏杰杜瑶
Owner BEIJING UNIV OF CHEM TECH
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