Ultraviolet double-wave excitation fluorescent transparent invisible anti-fake nano-paper preparation method

A nano-paper and fluorescence technology, which is used in replication/marking methods, papermaking, textiles and papermaking, etc., can solve the problems of poor anti-counterfeiting ability, easy overlapping of emission spectra, and difficult identification of fluorescent labels, and achieves reduction of light scattering, excitation and Long launch period and strong double anti-counterfeiting effect

Inactive Publication Date: 2015-08-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the fluorescent anti-counterfeiting papers in the market are single-color and single-wave, which are easy to imitate and have poor anti-counterfeiting ability; and multi-color fluorescent anti-counterfeiting papers are easy to overlap due to the emission spectrum, which will make it difficult to identify fluorescent marks.

Method used

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  • Ultraviolet double-wave excitation fluorescent transparent invisible anti-fake nano-paper preparation method
  • Ultraviolet double-wave excitation fluorescent transparent invisible anti-fake nano-paper preparation method
  • Ultraviolet double-wave excitation fluorescent transparent invisible anti-fake nano-paper preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] S1. Uniformly disperse ONFC in 100 mL ethanol solution to form a stable suspension of 0.5w / v%, then add 5 mg Tb(Tfacac) to the solution 3 (H 2 O) 2 , ultrasonically disperse evenly, then pour the obtained suspension into a high-pressure filter press, adjust the appropriate pressure, and press-filter until the filtrate no longer flows out to obtain transparent nano-paper.

[0019] S2. Disperse fluorescent carbon dots with a particle size of about 4 nm in deionized water at a ratio of 0.05 mg / mL as fluorescent ink, and use screen printing technology to print the two-dimensional code of the product on the surface of fluorescent transparent nanopaper. Place it on a flat glass sheet to dry naturally to obtain an invisible double-fluorescence transparent nano-paper with a two-dimensional code.

[0020] S3. Fluorescent performance test: Under the excitation of ultraviolet light with a wavelength of 365 nm, the carbon quantum dots will emit blue fluorescence, and a clear blue...

Embodiment 2

[0022] S1. Disperse ONFC evenly in 100 mL ethanol solution to form a stable suspension of 0.5w / v%, then add 5 mg Eu(dbm) to the solution 3 (H 2 O) 2 , ultrasonically disperse evenly, then pour the obtained suspension into a high-pressure filter press, adjust the appropriate pressure, and press-filter until the filtrate no longer flows out to obtain transparent nano-paper.

[0023] S2. Disperse fluorescent carbon dots with a particle size of about 4 nm in anhydrous ethanol at a ratio of 0.1 mg / mL as fluorescent ink, and use screen printing technology to print the two-dimensional code of the product on the surface of fluorescent transparent nano-paper. It is placed on a flat glass sheet to dry naturally, and an invisible double fluorescent transparent nano-paper with a two-dimensional code is obtained.

[0024] S3. Fluorescence performance test: Under the excitation of ultraviolet light with a wavelength of 254 nm, the carbon quantum dots will emit blue fluorescence, and a cle...

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Abstract

The invention discloses an ultraviolet double-wave excitation fluorescent transparent invisible anti-fake nano-paper preparation method which includes the steps: firstly, combining lanthanide complexes and ONFCs (oxide nano-cellulose fibers) to form fluorescent transparent nano-paper; secondly, printing fluorescent carbon dots on the nano-paper in a fixed-point manner to obtain double fluorescent transparent nano-paper with an invisible anti-fake tag. The novel fluorescent transparent anti-fake nano-paper with the invisible tag has double fluorescent effects under excitation of double-waveband ultraviolet. The prepared anti-fake nano-paper is highly transparent, the anti-fake tag cannot be identified in a visualized manner under visible light and has double-color fluorescent effects under specific ultraviolet wavelength, imitation difficulty is greatly improved, and the anti-fake performance is improved.

Description

technical field [0001] The invention relates to an anti-counterfeit nano paper and a preparation method thereof, in particular to a preparation method of fluorescent transparent invisible anti-counterfeit nano paper excited by ultraviolet dual-band, and belongs to the technical field of anti-counterfeit nano paper preparation. Background technique [0002] As people's awareness of property rights protection and brand awareness increases, anti-counterfeiting plays an increasingly important role in various industries such as certificates, currency, labels, important documents, and national security. It is usually used to eliminate counterfeiting, maintain corporate image, and protect consumer rights. and other commercial fields. Fluorescent effect is one of the common technical means in the field of anti-counterfeiting, which has the advantages of simple preparation and easy identification. In the current manufacturing process of fluorescent anti-counterfeiting paper, most of...

Claims

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Application Information

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IPC IPC(8): D21H21/40D21H15/02B41M5/00
Inventor 冯欣苗苗施利毅赵亚飞曹阳曹绍梅孙丽宁
Owner SHANGHAI UNIV
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