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Anti-counterfeiting element capable of dynamically sensing magnetic field position changes and manufacturing method of anti-counterfeiting element

A technology of anti-counterfeiting components and induction magnetic fields, which is applied in applications, computer components, authenticity inspection of banknotes, etc., can solve the problems of non-reversibility of optical effects, and achieve the effect of consistent optical colors

Inactive Publication Date: 2013-08-28
SHANGHAI BANKNOTE PRINTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optical effect produced by this method is not reversible, and it is impossible to restore the original optical characteristics in a short time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of nanoparamagnetic materials:

[0029]Polyacrylic acid (PAA)-stabilized Fe3O4 nanoparticles were synthesized in one step by high-temperature pyrolysis. The specific experimental steps were as follows: First, weigh 2g (50mmol) sodium hydroxide (NaOH) and dissolve it in 20ml diethylene glycol (DEG), The mixed solution was heated to 120°C under nitrogen protection and kept stirring for one hour, then cooled to 70°C and stored for later use, and recorded as NaOH / DEG mixed solution. Weigh 4mmol of polyacrylic acid (PAA), 0.4mmol of ferric chloride (FeCl 3 ) was dissolved in 17ml of diethylene glycol (DEG), and the mixed solution was heated to 220°C under nitrogen protection and kept stirring for half an hour until a yellow transparent solution was formed. Take the newly prepared 1.75ml NaOH / DEG mixed solution and quickly inject it into the above solution, then lower the temperature to 210°C and keep it for one hour, then cool down and wash with deionized water ...

Embodiment 2

[0032] Preparation of capsules:

[0033] Put urea and 37% formaldehyde in a three-necked flask with a mass ratio of 1:2, add 30% triethanolamine to adjust the acidity, and keep the pH value at 7-8. Reflux in a 70°C water bath for 1 hour to form a water-soluble viscous transparent liquid, add 60-120ml of distilled water to dilute to obtain a urea-formaldehyde prepolymer. Add the blue electrophoretic solution to the urea-formaldehyde prepolymer, stir at 1250 rpm for 24 hours, and then use 20% glacial acetic acid to adjust the pH to 2-4. The formed microcapsules were washed with distilled water, filtered and dried to become free-flowing spherical capsules. The average particle size of the capsules is 46 microns. Example 3

Embodiment 3

[0034] Fabrication of anti-counterfeiting components that can dynamically sense changes in magnetic field positions

[0035] 30 grams of embodiment 2 capsules are mixed with 70 grams of transparent UV-curable varnish to form ink, and the mixed ink is coated on the black PET film with a scraper, and the coating thickness is 300 microns, and the appropriate solvent is evaporated, and then The ink is cured with UV light. The produced film can produce a visible light band rolling effect as the position of the magnetic field changes.

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PUM

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Abstract

The invention discloses an anti-counterfeiting element capable of dynamically sensing magnetic field position changes. The anti-counterfeiting element at least consists of a material layer capable of generating the dynamic rolling optical change effect along with an external magnetic field, wherein when the applied magnetic field is withdrawn, the material layer can immediately recover the original appearance feature, the anti-counterfeiting material layer comprises a plurality of nanometer particles capable of realizing the position rearrangement through the magnetic field size change, and the nanometer particles are nanometer particle materials with paramagnetism performance. The anti-counterfeiting element has the advantages that the material preparation needs to adopt the nanotechnology, the difficulty of the counterfeiting by counterfeiters can be increased, and meanwhile, the optical band rolling change feature in the visual sense can be generated by a simple identification tool such as a magnet, so for people using anti-counterfeiting products, the capability of effectively preventing an anti-counterfeiting file from being counterfeited is realized.

Description

technical field [0001] The invention relates to an anti-counterfeiting element and a manufacturing method thereof, in particular to a rolling optical anti-counterfeiting element capable of dynamically sensing changes in the position of a magnetic field, a method for making the anti-counterfeiting element and a method for checking the anti-counterfeiting feature. Background technique [0002] Materials with magnetic or optical anti-counterfeiting features have long been used in many anti-counterfeiting products. As an important anti-counterfeiting carrier, it is very urgent to apply these anti-counterfeiting features to banknotes and securities to prevent counterfeiting. [0003] Chinese patent CN1122816 has invented a kind of magnetic anti-counterfeiting ink. The ink is composed of ferric oxide, binder, pigment, auxiliary material, additive and so on. Tickets and the like printed by using the magnetic anti-counterfeiting ink of the present invention can adapt to man-machin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07D7/04C09D11/02C09D7/12C09D11/00G07D7/20
Inventor 刘科丁龙喜金劼吴旺宝郭界花颖
Owner SHANGHAI BANKNOTE PRINTING
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