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Panchromatic fluorescent anti-counterfeiting ink based on conjugated polymer nano-particles

A conjugated polymer and nanoparticle technology, used in inks, household appliances, applications, etc., can solve the problems of unstable chemical properties and single color of fluorescent inks, and achieve the effects of stable properties, high luminous intensity and high fluorescent brightness.

Active Publication Date: 2014-09-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing fluorescent inks used in anti-counterfeiting printing have disadvantages such as single color and unstable chemical properties

Method used

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  • Panchromatic fluorescent anti-counterfeiting ink based on conjugated polymer nano-particles
  • Panchromatic fluorescent anti-counterfeiting ink based on conjugated polymer nano-particles
  • Panchromatic fluorescent anti-counterfeiting ink based on conjugated polymer nano-particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Preparation of fluorescent anti-counterfeiting ink based on PDHF, PF-10BT and PF-5DTBT conjugated polymer nanoparticles

[0041] Firstly, prepare a tetrahydrofuran solution of PDHF conjugated polymer at a concentration of 1.0 mg / mL; then prepare a tetrahydrofuran solution of polystyrene maleic anhydride (PSMA) at a concentration of 1.0 mg / mL. Then, the above solutions were diluted with tetrahydrofuran to obtain 20 mL of a mixed solution having a conjugated polymer concentration of 50 μg / mL and a PSMA concentration of 10 μg / mL. Then the above solution was thoroughly mixed. Then, with sonication, 5 mL of the mixed solution was quickly injected into 10 mL of water and sonication was continued for 2 minutes. Finally, blow N while heating on the heating platform 2 To remove tetrahydrofuran in the solution after injection, and continue to heat and concentrate to 5 mL. The concentrated polymer nanoparticle aqueous solution was filtered through a 220nm filter h...

Embodiment 2

[0046] Example 2: Absorption and fluorescence emission of polymer nanoparticle fluorescent ink

[0047] The three polymers PDHF, PF-10BT and PF-5DTBT obtained functionalized polymer nanoparticles by the "reprecipitation" method, which made their aqueous solutions extremely stable and remained clear for several months without any aggregation. Shen signs. like figure 1 As shown, the main ultraviolet absorption peak centers of the three polymer nanoparticle suspensions are around 375nm, which indicates that the final anti-counterfeiting pattern can be simultaneously excited by a single wavelength in the ultraviolet region. like figure 2 As shown in the fluorescence spectra, PFDH, PF-10BT and PF-5DTBT exhibit blue (430nm), green (540nm) and red (650nm) emission light, respectively. Using three primary colors, a range of luminescent colors can be obtained by combining RGB color modes, and printing is achieved using fluorescent inks of polymer nanoparticles, which gives a meanin...

Embodiment 3

[0048] Example 3: Particle Size and Morphology of Polymer Nanoparticles

[0049] The hydrated particle size of polymer nanoparticles is first measured by dynamic light scattering (DLS), as image 3 As shown, the polymer nanoparticles of PDHF, PF-10BT and PF-5DTBT have average diameters of 22 nm, 19 nm and 17 nm, respectively. In addition, the particle morphology and particle size of the polymer nanoparticles were also characterized by transmission electron microscopy (TEM), as Figure 4 As shown, the polymer nanoparticles are spherical and the particle diameter and DLS test results are basically consistent.

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Abstract

The invention discloses a panchromatic fluorescent anti-counterfeiting ink based on conjugated polymer nano-particles, belonging to the technical field of nano luminescent materials. The panchromatic fluorescent anti-counterfeiting ink consists of 0.001-1% of conjugated polymer nano-particles, 0-20% of additive and water in percentage by mass, wherein the conjugated polymer nano-particles consist of a conjugated polymer and a functional polymer; the functional polymer accounts for 1-20% in percentage by mass of the conjugated polymer nano-particles. A prepared nano-particle aqueous solution with small size and uniform distribution can be used as the fluorescent anti-counterfeiting ink with variety of light-emitting wavelengths such as red, green, blue and the like. The anti-counterfeiting ink can be used for obtaining panchromatic anti-counterfeiting patterns with high illumination brightness, stability and non-toxicity by virtue of technologies such as handwriting, ink-jet printing and silk-screen printing. By adopting the panchromatic fluorescent anti-counterfeiting ink, the application range of conjugated light-emitting polymers can be expanded, and the problems that a conventional anti-counterfeiting ink hardly realizes panchromatic and stable anti-counterfeiting can be solved. The panchromatic fluorescent anti-counterfeiting ink disclosed by the invention has a plurality of characteristics of an ideal anti-counterfeiting ink, and can be used for obtaining polychromatic, stable and high-brightness fluorescent anti-counterfeiting patterns.

Description

technical field [0001] The invention belongs to the technical field of nano-luminescent materials, and specifically relates to the use of conjugated polymers to prepare a small-sized, uniformly distributed nano-particle aqueous solution as a fluorescent anti-counterfeiting ink with three primary colors of red, green and blue. The fluorescent anti-counterfeiting ink is printed by handwriting and inkjet A full-color anti-counterfeiting pattern with high luminous intensity, stable properties and environmental friendliness can be obtained. Background technique [0002] Anti-counterfeiting patterns with identification and authentication functions have been widely used in banknotes, tamper-evident labels, product authentication and identity documents. As the most important part of anti-counterfeiting printing, anti-counterfeiting ink is made of many functional materials, and can be divided into colorless ink, thermochromic ink, solvent-sensitized ink, optical variable ink, magneti...

Claims

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Application Information

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IPC IPC(8): C09D11/50C09D11/30C09D11/102C09D11/106
Inventor 吴长锋常开文秦伟平
Owner JILIN UNIV
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