Dual anti-counterfeiting fluorescent ink as well as preparation method and application thereof

A fluorescent ink and dual technology, applied in the field of dual anti-counterfeiting fluorescent ink and its preparation, can solve the problems of strict synthesis conditions, single luminescence behavior, general anti-counterfeiting effect, etc., and achieve the effects of low cost, simple synthesis conditions and remarkable anti-counterfeiting effect.

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese patent application with the application number 201611177038.1 discloses a water-based fluorescent anti-counterfeiting ink based on carbon quantum dots and its preparation method. The behavior is relatively simple, and the anti-counterfeiting effect is average
The Chinese patent application with the application number 201710335455.2 discloses a dual-mode luminescent ink and its preparation method. This scheme combines β-NaYF4 particles with carbon quantum dots to obtain dual fluorescent inks in the ultraviolet and near-infrared regions, but the synthesis conditions are strict. , high cost, cumbersome operation

Method used

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  • Dual anti-counterfeiting fluorescent ink as well as preparation method and application thereof
  • Dual anti-counterfeiting fluorescent ink as well as preparation method and application thereof
  • Dual anti-counterfeiting fluorescent ink as well as preparation method and application thereof

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Embodiment 1

[0047] This embodiment provides a rare earth element and carbon quantum dot grafted nanofibril cellulose-based fluorescent ink and its preparation method.

[0048] (1) Preparation of rare earth doped carbon dots: the molar ratio of citric acid hexahydrate to ethylenediamine is 1:3, the molar ratio of ytterbium chloride hexahydrate to erbium chloride hexahydrate is 5:1, citric acid hexahydrate and hexahydrate Yb in ytterbium chloride hydrate 3+ The molar ratio of citric acid and water is 1:1, the mass ratio of citric acid and water is 1:10, and 10ml of distilled water are successively added to a 100ml beaker, stirred continuously at room temperature for 15min, and mixed evenly; then the mixed solution is transferred into polytetrafluoroethylene In a hydrothermal reaction kettle lined with an oil bath, it was heated to 120° C. and the reaction was continued for 3 hours; then the product was cooled to room temperature, dialyzed in a dialysis bag (200 cut-off molecular weight) for...

Embodiment 2

[0053] This embodiment provides a rare earth element and carbon quantum dot grafted nanofibril cellulose-based fluorescent ink and its preparation method.

[0054] (1) Preparation of rare earth doped carbon dots: the molar ratio of citric acid hexahydrate to ethylenediamine is 1:5, the molar ratio of ytterbium chloride hexahydrate to erbium chloride hexahydrate is 10:1, citric acid hexahydrate and hexahydrate Yb in ytterbium chloride hydrate 3+ The molar ratio of citric acid and water is 3:1, the mass ratio of citric acid and water is 3:10 raw material, 10ml distilled water, add successively in the 100ml beaker, stir continuously at room temperature for 15min, mix well; then move the mixed solution into polytetrafluoroethylene In a hydrothermal reaction kettle lined with an oil bath, it was heated to 180°C and the reaction was continued for 10 hours; then the product was cooled to room temperature, dialyzed in a dialysis bag (200 cut-off molecular weight) for 36 hours, collect...

Embodiment 3

[0059] This embodiment provides a rare earth element and carbon quantum dot grafted nanofibril cellulose-based fluorescent ink and its preparation method.

[0060] (1) Preparation of rare earth doped carbon dots: the molar ratio of citric acid hexahydrate to ethylenediamine is 1:4, the molar ratio of ytterbium chloride hexahydrate to erbium chloride hexahydrate is 8:1, citric acid hexahydrate and hexahydrate Yb in ytterbium chloride hydrate 3+ The molar ratio of citric acid and water is 2:1, the mass ratio of citric acid and water is 1:5, 10ml of distilled water is added to a 100ml beaker successively, stirred continuously at room temperature for 15min, and mixed evenly; then the mixed solution is transferred into polytetrafluoroethylene In a hydrothermal reaction kettle lined with an oil bath, the product was heated to 160°C for 6 hours; then the product was cooled to room temperature, dialyzed in a dialysis bag (200 cut-off molecular weight) for 36 hours, collected for later...

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Abstract

The invention discloses dual anti-counterfeiting fluorescent ink as well as a preparation method and an application thereof. The method comprises the following steps: reacting citric acid hexahydrate,ethylenediamine, ytterbium chloride hexahydrate, erbium chloride hexahydrate and water to obtain doped carbon quantum dots; mixing rare earth doped carbon dots, dialdehyde nano fibril cellulose, 2-methylpyridine-N-borane and a sodium acetate-glacial acetic acid buffer solution for reaction to obtain a Yb / Er-carbon dot-nano cellulose composite material; and mixing the Yb / Er-carbon dot-nanocellulose composite material, polyvinyl alcohol, methylene blue, sodium stearate, urea and water to obtain the dual anti-counterfeiting fluorescent ink. The method is green, environmentally friendly, low in toxicity and simple and convenient in synthesis method, blue fluorescence and green fluorescence can be emitted, compared with traditional fluorescent ink, the added nano-fibril cellulose greatly improves the rheological property and thixotropic property of the water-based ink, has certain competitive advantages compared with products of the same type, and can be used for important information security anti-counterfeiting application.

Description

technical field [0001] The invention belongs to the field of inks, and in particular relates to a double anti-counterfeiting fluorescent ink, a preparation method and application thereof. In particular, it relates to a rare earth element-doped carbon quantum dot grafted nanofibril cellulose-based fluorescent ink, a preparation method thereof, and an anti-counterfeiting application. Background technique [0002] In the information age, counterfeiting is a huge challenge to human property and even personal safety. Therefore, in order to ensure the safety and integrity of important information (such as banknotes, important documents, certificates, brands, etc.), there is an increasing demand for anti-counterfeiting technology. In recent years, anti-counterfeiting technology based on various complex anti-counterfeiting mechanisms has been developed rapidly, such as marking, barcode, thermal imaging, fluorescence detection, etc. Among them, fluorescent ink, as a simple and effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/50C09D11/106C09D11/14C09D11/03C08B15/02
CPCC08B15/02C09D11/03C09D11/106C09D11/14C09D11/50
Inventor 曾劲松李鹏飞陈克复
Owner SOUTH CHINA UNIV OF TECH
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