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A fluorescent anti-counterfeiting composite material with adjustable wavelength and its preparation method

A composite material, fluorescence technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, selenium/tellurium compounds, etc. The problem is to achieve the effect of simple preparation steps, mild synthesis conditions, and simple synthesis process.

Active Publication Date: 2021-09-03
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN103102675A discloses a preparation method of fluorescent polyurethane resin, which is applied to anti-counterfeiting ink, but its fluorescent substance uses europium, and the content of europium in the earth's crust is 0.000106%, which is the rarest rare earth element. For the field of anti-counterfeiting, it is inevitable Obviously not a good choice when a large amount of fluorescent substances are required
[0005] CN101650541A discloses an anti-counterfeiting toner, which needs to use machines such as mixers and extruders, and the operation is complicated
[0006] CN102517005A discloses graphite oxide / terbium acetylacetonate nano fluorescent composite material and its preparation. When preparing the nanocomposite material, it is necessary to wash the unreacted terbium acetylacetonate repeatedly with tetrahydrofuran, which is not friendly to the environment
[0007] CN103343005A discloses a kind of highly stable carbon nano-fluorescent dyeing agent, and its binding agent is silicate aqueous solution etc., and acid and alkali resistance and water resistance are poor, and brittleness is bigger, not impact resistance, and the bonding strength of butt joint is lower, and Aging resistance is not ideal
[0008] CN104789225A discloses a quantum dot-silk fibroin gel fluorescent nano anti-counterfeiting material and its preparation method. The silk fibroin gel used in it has poor stability and is easily deteriorated when the environment changes. The product quality is difficult to control and the repeatability is poor.

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  • A fluorescent anti-counterfeiting composite material with adjustable wavelength and its preparation method
  • A fluorescent anti-counterfeiting composite material with adjustable wavelength and its preparation method

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preparation example Construction

[0038] The present invention also provides a method for preparing a fluorescent anti-counterfeiting composite material with adjustable wavelength, the method comprising:

[0039] Step 1: preparing a cadmium telluride quantum dot solution;

[0040] Step 2: preparing polyurethane prepolymer;

[0041] Step 3: Add the cadmium telluride quantum dot solution obtained in step 1 to the polyurethane prepolymer obtained in step 2 for emulsification under stirring to obtain an aqueous polyurethane dispersion, place the solvent at room temperature to completely evaporate and then vacuum dry to obtain Fluorescent anti-counterfeiting composite material with tunable wavelength.

[0042] According to the present invention, the cadmium telluride quantum dot solution is prepared first, preferably as follows: add the cadmium source, the ligand, and water into the reaction vessel at room temperature, adjust the pH value, add the tellurium source under anaerobic conditions, and heat to reflux at ...

Embodiment 1

[0050] 1) Preparation of cadmium telluride quantum dot solution:

[0051] Dissolve 0.001mol cadmium chloride and 0.004mol mercaptoethylamine in 90mL water, adjust the pH value to 5.6, and add 0.0003molL sodium hydride telluride solution under anaerobic conditions, heat and reflux at 150°C for 3h, then concentrate by rotary evaporation to 10mL Cadmium telluride solution.

[0052] 2) Preparation of polyurethane prepolymer:

[0053] Add 0.020mol polyoxypropylene diol, 0.009mol dimethylol butyric acid and 0.038mol toluene diisocyanate to the reaction flask, heat and stir at 80°C for 40 minutes, then cool down to room temperature, add 0.007mol acetone and stir for 2 minutes, then add 0.008mol triethylamine, continue to react for 10min, finally add 0.002molL γ-aminopropyltriethoxysilane, stir for 5min, and obtain the polyurethane prepolymer.

[0054] 3) Preparation of fluorescent anti-counterfeiting composite materials with tunable wavelength:

[0055] Add the cadmium telluride q...

Embodiment 2

[0058] 1) Preparation of cadmium telluride quantum dot solution:

[0059] Dissolve 0.001mol cadmium chloride and 0.004mol mercaptoethylamine in 90mL water, adjust the pH value to 5.6, and add 0.0003moL sodium telluride hydride solution under anaerobic conditions, heat and reflux at 150°C for 1 hour, then concentrate by rotary evaporation to 10mL Cadmium telluride solution.

[0060] 2) Preparation of polyurethane prepolymer:

[0061] Add 0.020mol polyoxypropylene diol, 0.009mol dimethylol butyric acid and 0.038mol toluene diisocyanate to the reaction flask, heat and stir at 70°C for 80 minutes, then cool down to room temperature, add 0.007mol acetone and stir for 5 minutes, then add 0.008mol triethylamine, continue to react for 30min, finally add 0.002molL γ-aminopropyltriethoxysilane, stir for 10min, and obtain the polyurethane prepolymer.

[0062] 3) Preparation of fluorescent anti-counterfeiting composite materials with tunable wavelength:

[0063] Add the cadmium telluri...

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Abstract

The invention provides a fluorescent anti-counterfeit composite material with adjustable wavelength and a preparation method thereof, belonging to the field of fluorescent anti-counterfeit composite materials. The composite material is composed of the following components in terms of weight percentage: 0.5-5% of cadmium telluride quantum dots; and 95-99.5% of polyurethane material. The present invention also provides a method for preparing a fluorescent anti-counterfeiting composite material with adjustable wavelength. The method first prepares a cadmium telluride quantum dot solution; then prepares a polyurethane prepolymer; and finally adds the cadmium telluride quantum dot solution to the polyurethane under stirring. Emulsifying in the prepolymer to obtain a water-based polyurethane dispersion, placing the solvent at room temperature to completely volatilize, and then vacuum drying to obtain a fluorescent anti-counterfeiting composite material with adjustable wavelength. The fluorescent anti-counterfeiting composite material provided by the present invention is an invisible anti-counterfeiting material, and part of the composite material can be mixed into the normal pattern to make it emit different colors of visible light under ultraviolet light than that under visible light, thereby forming a new pattern and playing an anti-counterfeiting role. Effect.

Description

technical field [0001] The invention belongs to the field of fluorescent anti-counterfeiting composite materials, and in particular relates to a fluorescent anti-counterfeiting composite material with adjustable wavelength and a preparation method thereof. Background technique [0002] In recent years, as the phenomenon of counterfeiting and selling fake and inferior products has become increasingly rampant, it has brought great harm to people's production and life. Especially in the manufacture and fraud of food and medicine, it has caused serious consequences. In order to curb this social cancer, it is necessary to improve anti-counterfeiting technology and means, so as to achieve the purpose of efficient anti-counterfeiting. At present, with the gradual maturity of imitation technology, some common anti-counterfeiting technologies have lost their anti-counterfeiting effect and cannot distinguish fake and shoddy products. [0003] Water-based polyurethane has the charact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K3/30C01B19/00B82Y30/00B82Y40/00C08G18/76C08G18/66C08G18/48C08G18/34C08G18/12
CPCB82Y30/00B82Y40/00C01B19/007C01P2004/64C01P2006/60C08G18/0823C08G18/12C08G18/348C08G18/3893C08G18/4825C08G18/6692C08G18/7614C08K3/30C08L75/04
Inventor 孙海珠赵亮邵琛朱东霞苏忠民
Owner NORTHEAST NORMAL UNIVERSITY
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