Continuous color-changing fluorescent anti-counterfeiting material as well as preparation method and application thereof

A color-changing fluorescence and dye technology, applied in luminescent materials, applications, chemical instruments and methods, etc., can solve the problems of unable to provide color change and color change path, unable to meet the actual needs of anti-counterfeiting materials, and high equipment costs

Active Publication Date: 2021-09-24
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the previous article published by our research group (DOl: 10.1021 / acsanm.0c02671), in terms of material structure, since only 8-hydroxyquinoline was encapsulated in the MOF cavity, only Eu 3+ A lanthanide ion, so the prepared substance is only one of this kind of MOF materials, and the structure is only a special case among many new structures, which is not representative and universal, and it is impossible to speculate such a kind of material through this kind of material structure. The characteristics and similarities and differences of the substances; in the preparation method, since the preparation of the same type of MOF materials by the hydrothermal method needs to be sealed in a reactor, the preparation process requires a high temperature and high pressure (temperature can be as high as 180 ° C) environment, with complex synthesis conditions , high risk, high cost of equipment and other disadvantages, which limit the industrial production of such MOF materials and cannot meet the actual needs of anti-counterfeiting materials; in the application of anti-counterfeiting materials, 8-hydroxyquinoline encapsulated in the MOF cavity small molecules, the Eu introduced later 3+ , under the excitation wavelength of 254nm-365nm, the luminescent color can be changed from red to green, which can be applied to ordinary fluorescent anti-counterfeiting, such as ordinary paper anti-counterfeiting, plastic film anti-counterfeiting and LOGO anti-counterfeiting, etc.
However, since the luminous color of the above materials can only be changed from red to green, the luminous color is relatively monotonous, and the path of continuous color change is single, and it is impossible to realize the transition between other luminous colors and the composite luminescence between different luminescent materials. , cannot provide more complex and rich color changes and color change paths under different excitations, thus limiting the deeper application of materials in anti-counterfeiting

Method used

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  • Continuous color-changing fluorescent anti-counterfeiting material as well as preparation method and application thereof
  • Continuous color-changing fluorescent anti-counterfeiting material as well as preparation method and application thereof
  • Continuous color-changing fluorescent anti-counterfeiting material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Preparation of MOF (5×10 -5 7-Hydroxycoumarin), Eu 3+ / MOF(5×10 -5 7-hydroxycoumarin) the steps are as follows:

[0092] Wherein, the structural formula of 7-hydroxycoumarin is:

[0093]

[0094] (1) MOF (5×10 -5 • Preparation of 7-hydroxycoumarin). Firstly, 0.0162g (0.1mmol) of 7-hydroxycoumarin was dissolved in 10mL of N,N-dimethylformamide (DMF) solution to prepare a DMF solution of 7-hydroxycoumarin. Then take 1.1672g (5.01mmol) of zirconium chloride (ZrCl 4 ), 0.6654g (4.01mmol) of terephthalic acid (TPA) and 0.1675g (1.01mmol) of 2,6-pyridinedicarboxylic acid (DPA) were successively dissolved in 30mL of DMF, and 5mL of 7-hydroxy The DMF solution of bean element was added to the above solution and stirred for 10 min, and about 1 mL of hydrochloric acid solution (mass concentration: 25%) was added to the above mixed solution after the stirring was completed. The resulting solution was transferred to a 50 mL round-bottomed flask, and the heating and reflux re...

Embodiment 2

[0106] Preparation of Tb 3+ / MOF(5×10 -5 7-hydroxycoumarin) the steps are as follows:

[0107] Step (1) is with embodiment 1;

[0108] (2)Tb 3+ / MOF(5×10 -5 • Preparation of 7-hydroxycoumarin). First weigh 1.8670g (5.00mmol) of TbCl 3 Sonicate dissolved in 50 mL of distilled water to prepare Tb 3+ solution. Then weigh 0.3000g of MOF (5×10 -5 7-Hydroxycoumarin) was put into a 50mL round bottom flask, and then 20mL of Tb 3+ The solution was added to the upper round bottom flask. This solution was refluxed at 80°C for 12h. Naturally cooled to room temperature, centrifuged to collect the precipitate, washed alternately with water and ethanol for 6 times, dried in a blast drying oven at 50° C. for 12 hours, and finally collected to obtain a solid powder product.

[0109] (3) Similarly, the Eu 3+ / MOF(5×10 -5 7-Hydroxycoumarin) material was changed to Tb 3+ / MOF(5×10 -5 7-hydroxycoumarin) material, other steps are with the step (3) of embodiment 1, prepare with Tb 3+...

Embodiment 3

[0115] Embodiment 3 prepares MOF (5 * 10 -5 ·5-Cl-HQ) material and Eu 3+ / MOF(5×10 -5 5-Cl-HQ) material steps are as follows:

[0116] Wherein the structural formula of 5-Cl-HQ is:

[0117]

[0118] (1) MOF (5×10 -5 • Preparation of 5-Cl-HQ). Other steps, MOF (5×10 -5 The preparation method of 5-Cl-HQ) and MOF (5×10 -5 · 7-hydroxycoumarin) was prepared in the same way. The difference is that 0.0162g (0.1mmol) of 7-hydroxycoumarin is replaced by 0.0180g (0.1mmol) of 5-chloro-8-hydroxyquinoline.

[0119] (2) Eu 3+ / MOF(5×10 -5 • Preparation of 5-Cl-HQ). Other steps, Eu 3+ / MOF(5×10 -5 The preparation method of 5-Cl-HQ) and Eu 3+ / MOF(5×10 -5 The preparation method of 7-hydroxycoumarin) is the same, the difference is that the MOF (5×10 -5 7-Hydroxycoumarin) was replaced by MOF (5×10 -5 · 5-Cl-HQ) is sufficient.

[0120] (3) Preparation of fluorescent anti-counterfeiting ink and anti-counterfeiting patterns. At 25°C, distilled water, Eu 3+ / MOF(5×10 -5 5-Cl-H...

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Abstract

The invention relates to a continuous color-changing fluorescent anti-counterfeiting material as well as a preparation method and application thereof. The material is Ln < 3 + >/MOF. dye, wherein the amount of dye contained in every 2.4000 g of MOF is 5 * 10 <-6 > mol to 1 * 10 <-4 > mol, and the amount of Ln < 3 + > contained in every 2.4000 g of MOF is 0.016 mol to 0.08 mol. The preparation method comprises the following steps: encapsulating dye molecules into a porous material by adopting a hot reflux method to prepare the MOF. dye, and introducing lanthanide ions into the MOF. dye by adopting a post-functionalization synthesis method to synthesize a new substance structure of the Ln < 3 + >/MOF. dye. The obtained material has the advantages of being high in concealment, high in safety performance, low in multi-mode continuous color-changing light-emitting imitability and the like when applied to the fluorescent anti-counterfeiting aspect, the multi-anti-counterfeiting effect is achieved, the potential in the fluorescent anti-counterfeiting aspect is huge, the application value is high, and the wide application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of anti-counterfeiting materials. A continuous color-changing fluorescent anti-counterfeiting material and its preparation method and application are specifically designed. Background technique [0002] With the rapid development of science and technology and the global economy, the counterfeiting of currencies, trademarks and important documents has become a difficult problem all over the world, seriously damaging the economic interests of countries and individuals. Although many anti-counterfeiting technologies have been developed to combat counterfeiting, such as digital watermarking, quick response (QR) codes, radio frequency identification, computer security technology, etc. However, the above-mentioned anti-counterfeiting technology has the disadvantages of complex preparation process, high technical cost, high toxicity and poor concealability, which make the results unsatisfactory in the actual application pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09B67/02C09D11/50
CPCC09K11/06C09B67/0097C09D11/50C09K2211/182C09K2211/183C09K2211/1088C09K2211/1029
Inventor 章文军文雪史绍洋
Owner HEBEI UNIV OF TECH
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