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Anti-counterfeit coating of magnetic fluorescent paper and preparation method thereof

A fluorescence and paper technology, which is applied in the direction of adding luminescent/fluorescent substances, papermaking, textiles and papermaking, etc., to achieve the effects of saving production costs, high sizing efficiency, and easy use

Inactive Publication Date: 2014-05-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems caused by introducing carriers such as fibers into the process of adding quantum dots to pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Accurately weigh urea and sodium citrate and mix them uniformly in a molar ratio of 3:1. The mixture is a solid powdery mixture. Put the mixture into a high-pressure reactor, heat it at 180°C for 1.5 hours, and then cool it to room temperature. Dissolve in absolute ethanol and boil at 100°C, then centrifuge at 20,000rpm to remove the large impurities in the lower layer, and then dialyze with a dialysis membrane with a molecular weight cut-off of 3500M for 48 hours. The dialysate is deionized water. 4nm fluorescent carbon dot particles, its aqueous dispersion is light yellow under visible light, and can emit bright blue fluorescence under the irradiation of an ultraviolet lamp (8W) with an excitation wavelength of 365nm. Then mix fluorescent carbon dots with nano-manganese ferrite in a mass ratio of 5:1 to prepare an aqueous dispersion with a solid mass fraction of 5%, put it in a container, and use a stirrer to reflux at 300rpm and 85°C Heat and stir for 6 hours. Afte...

Embodiment 2

[0021]Accurately weigh urea and sodium citrate according to the molar ratio of 1:2 and mix the two evenly, put the mixture into an autoclave, heat at 120°C for 1.5 hours, cool to room temperature, and dissolve the obtained product in absolute ethanol. Then boil at 100°C, then centrifuge at 20,000rpm to remove the large impurities in the lower layer, and then dialyze with a dialysis membrane with a molecular weight cut-off of 3500M for 48 hours. The dialysate is deionized water. After dialysis, fluorescent carbon dots with a particle size of 2~5nm The particles, whose aqueous dispersion is pale yellow under visible light, can emit bright blue fluorescence under the irradiation of an ultraviolet lamp (8W) with an excitation wavelength of 365nm. Then mix the fluorescent carbon dots with the nanometer ferroferric oxide according to the mass ratio of 3:1, and make an aqueous dispersion with a solid mass fraction of 5%, put it in a container, and use a stirrer at a speed of 300rpm at...

Embodiment 3

[0023] Accurately weigh urea and sodium citrate according to the molar ratio of 6:1 and mix the two evenly, put the mixture into a high-pressure reactor, heat it at 160°C for 1.5 hours, cool to room temperature, and dissolve the obtained product in absolute ethanol. Then boil at 100°C, then centrifuge at 20,000rpm to remove the large impurities in the lower layer, and then dialyze with a dialysis membrane with a molecular weight cut-off of 3500M for 48 hours. The dialysate is deionized water. The particles, whose aqueous dispersion is pale yellow under visible light, can emit bright blue fluorescence under the irradiation of an ultraviolet lamp (8W) with an excitation wavelength of 365nm. Then mix the fluorescent carbon dots with the nanometer ferroferric oxide according to the mass ratio of 8:1 to make an aqueous dispersion with a solid mass fraction of 5%, put it in a container, and use a stirrer at a speed of 300rpm at 85°C Heat and stir at reflux for 6 hours. After cooli...

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Abstract

The invention relates to an anti-counterfeit coating of magnetic fluorescent paper and a preparation method thereof, and belongs to the technical field of anti-counterfeit coatings. The anti-counterfeit coating of magnetic fluorescent paper provided by the invention comprises carbon quantum dots, nano magnetic particles and octadecenyl succinic anhydride. The carbon quantum dots, nano magnetic particles and octadecenyl succinic anhydride are combined to obtain an emulsion with good emulsion stability performance without adding an emulsion stabilizer. The emulsion can be used as an external sizing agent which is directly coated on the surface of paper. Therefore, the anti-counterfeit coating of magnetic fluorescent paper provided by the invention has magnetism and anti-counterfeiting performance, and can be used for improving the performances of paper such as smoothness, whiteness and water resistance. Furthermore, by adopting the anti-counterfeit coating of magnetic fluorescent paper provided by the invention, the sizing agent is not added in the papermaking process, so that the preparation step is simplified and the production cost is lowered. In addition, the anti-counterfeit coating of magnetic fluorescent paper provided by the invention has the advantages of good emulsion stability performance and high sizing efficiency.

Description

technical field [0001] The invention relates to a magnetic fluorescent paper anti-counterfeit paint and a preparation method thereof, belonging to the technical field of anti-counterfeit paint preparation. Background technique [0002] Anti-counterfeiting coatings can be applied to commodity packaging and trademark design to prevent products from being counterfeited, and provide a powerful means for product producers, consumers and distributors to distinguish the authenticity of commodities. The application of anti-counterfeiting coatings generally meets the following conditions: discoloration is reversible, triggers inductance such as discoloration at room temperature, discoloration is stable, accurate, and vivid, and generally does not contain heavy metals, toxic substances, and corrosive acid-base substances. Anti-counterfeit coatings cannot be put on the market as general commodities. Generally, an enterprise should have a monopoly right to produce or use anti-counterf...

Claims

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Application Information

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IPC IPC(8): D21H21/44D21H21/30D21H21/14
Inventor 于得海刘温霞王慧丽李国栋
Owner QILU UNIV OF TECH
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