Natural gem fluorescent anti-counterfeiting inkpad component, preparation method and anti-counterfeiting verification method

Abstract

The invention discloses a natural gem fluorescent anti-counterfeiting inkpad component, a preparation method and an anti-counterfeiting verification method. The natural gem fluorescent anti-counterfeiting inkpad component comprises the following components in percentage by mass: 5-30% of a natural gem fluorescent pigment, 20-50% of an adhesive, 10-40% of a filler, 0.5-5% of a stabilizer and the balance of a solvent, the natural gem fluorescent pigment is crushed and screened natural gem particles, the particle size range is 1-50 microns, and the natural gem fluorescent pigment emits visible fluorescence of 400-700 nm under the excitation of ultraviolet light. The adopted natural gems are unique in fluorescence characteristic, the selected natural gems such as ruby, sapphire, diamond and fluorite have specific crystal structures and microelements (such as Cr < 3 + > and rare earth elements), the fluorescence spectrum (such as the peak of 694 nm of the ruby and the peak of 435 nm of the fluorite) of the natural gems has narrow half-peak width (smaller than or equal to 35 nm) and high color purity, and an artificially synthesized material is difficult to completely reproduce.

Description

Technical Field

[0001] The present invention relates to the technical field of ink pad preparation, and in particular to a natural gem fluorescent anti-counterfeiting ink pad component, a preparation method and an anti-counterfeiting verification method. Background Art

[0002] With the booming art and collectibles market, counterfeiting techniques are becoming increasingly sophisticated, making traditional anti-counterfeiting methods (such as watermarks and laser labels) unable to meet high security requirements. Existing fluorescent anti-counterfeiting technologies often use synthetic fluorescent materials, but their fluorescent properties are easily imitated and lack long-term stability. Natural gemstones, due to their unique crystal structure and fluorescent properties, offer extremely high security against counterfeiting, but they have not yet been effectively applied in the field of anti-counterfeiting inks.

[0003] The present invention provides an anti-counterfeiting ink solution that is highly secure, easy to identify and difficult to imitate by selecting natural fluorescent gemstones and combining them with an optimized ink formula and preparation process. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a technical solution: a natural gem fluorescent anti-counterfeiting ink component, a preparation method and an anti-counterfeiting verification method, comprising the following components in percentage by mass:

[0005] Natural gemstone fluorescent pigment 5-30%

[0006] Adhesive 20-50%

[0007] Filler 10-40%

[0008] Stabilizer 0.5-5%

[0009] Solvent residue;

[0010] The natural gem fluorescent pigment is crushed and sieved natural fluorescent gem particles with a particle size range of 1-50 μm, which emit visible fluorescence of 400-700 nm under ultraviolet light excitation.

[0011] Furthermore, the natural fluorescent gemstone is selected from at least one of ruby, sapphire, diamond and fluorite having a fluorescent effect, and its fluorescent color corresponds to the type of gemstone.

[0012] Furthermore, the adhesive is at least one of acrylic resin, nitrocellulose or rosin-modified phenolic resin.

[0013] Furthermore, the filler is at least one of silicon dioxide, calcium carbonate or kaolin, and its particle size is less than 1 / 2 of the natural gem fluorescent pigment.

[0014] Furthermore, the stabilizer is a compound system of a hindered amine light stabilizer and a metal chelating agent, and the compounding mass ratio is 1:0.5-2.

[0015] The advantages of the invention compared with the prior art are:

[0016] 1. High anti-counterfeiting, difficult to imitate

[0017] Unique fluorescence characteristics of natural gemstones: the selected natural gemstones such as ruby, sapphire, diamond, fluorite, etc. have specific crystal structures and trace elements (such as Cr 3+ , rare earth elements, etc.), and their fluorescence spectra (such as the 694nm peak of ruby ​​and the 435nm peak of fluorite) have narrow half-peak width (≤35nm) and high color purity, which are difficult to be fully reproduced by artificial synthetic materials.

[0018] Traceable microscopic features: Natural gemstones may contain microscopic features such as inclusions and growth lines during their formation, further increasing the difficulty of imitation.

[0019] 2. Double verification, easy to use

[0020] Invisible under normal light: The ink pad is no different from ordinary ink pad under natural light and does not affect the original appearance of calligraphy and painting works.

[0021] Rapid development under UV light: Simply use 365nm UV light to immediately reveal the unique fluorescent pattern, without the need for professional equipment, making it suitable for on-site identification.

[0022] 3. Excellent long-term stability

[0023] Strong weather resistance: Through the compound system of hindered amine light stabilizer and metal chelating agent, it can effectively resist environmental factors such as ultraviolet rays, humidity and heat, ensuring that the fluorescence performance decay rate is less than 5% within 10 years.

[0024] Long-lasting adhesion: The acrylic resin / nitrocellulose binder system makes the ink pad have excellent wear resistance and aging resistance on paper, silk and other materials, and is not easy to fall off or fade. DETAILED DESCRIPTION

[0025] The present invention is described in further detail below.

[0026] The present invention provides a natural gem fluorescent anti-counterfeiting ink component in a specific implementation, comprising the following components in percentage by mass:

[0027] Natural gemstone fluorescent pigment 5-30%

[0028] Adhesive 20-50%

[0029] Filler 10-40%

[0030] Stabilizer 0.5-5%

[0031] Solvent residue;

[0032] The natural gem fluorescent pigment is crushed and sieved natural fluorescent gem particles with a particle size range of 1-50 μm, which emit visible fluorescence of 400-700 nm under ultraviolet light excitation.

[0033] Example 1: Ruby fluorescent anti-counterfeiting ink pad (suitable for calligraphy and painting works)

[0034] Formula composition (mass percentage)

[0035] Components content(%) Specifications Ruby fluorescent particles 20 <![CDATA[Particle size 5 - 20 μm, Cr 3t content ≥ 0.1 wt%]]> acrylic resin 35 Solid content 40%, viscosity 2000cP Nanosilica 25 <![CDATA[Particle size 50 nm, specific surface area 200 m 2 / g]]> Light stabilizer (compound) 2 Hindered amine + metal chelating agent (1:1) Anhydrous ethanol 18 Purity ≥99.7%

[0036] 2. Preparation Method

[0037] Pre-dispersion: Ruby particles were stirred with 50% ethanol at 300 rpm for 20 min;

[0038] Matrix formation: Add acrylic resin and remaining ethanol, stir at 600 rpm in a 50°C water bath for 40 minutes;

[0039] Filling and homogenization: Add silica and stabilizer in 3 batches, with an interval of 8 minutes between each batch, and stir until the viscosity reaches 8000 cP;

[0040] Fine grinding: Grind three times with a three-roll mill (pressure 0.3 MPa, 30°C), pass through a 150-mesh sieve, and age for 36 hours.

[0041] 3. Performance Testing

[0042] Fluorescence characteristics: Bright red fluorescence under 365nm ultraviolet light (main peak 694nm, half-peak width 28nm);

[0043] Adhesion: Passed the GB / T 9286 cross-cut test, grade 0 (no peeling);

[0044] Aging resistance: After 1000 hours of QUV accelerated aging, the fluorescence intensity retention rate is 96.5%.

[0045] Example 2: Fluorite fluorescent anti-counterfeiting ink (suitable for jewelry identification labels)

[0046] 1. Formula composition (mass percentage)

[0047] Components content(%) Specifications Fluorite fluorescent particles 15 Particle size 1-10μm, rare earth doped nitrocellulose 40 Nitrogen content 11.8%, viscosity 1500cP Kaolin 30 Particle size 1μm, loss on ignition ≤1% Metal chelators 3 EDTA-Ca complex Ethyl acetate 12 Purity ≥99.5%

[0048] 2. Preparation Method

[0049] Solvent activation: Fluorite particles were ultrasonically treated with ethyl acetate for 15 min (power 200 W);

[0050] Adhesive dissolution: Add nitrocellulose and stir magnetically at 45°C until completely dissolved (2 hours);

[0051] Gradient filling: Mix kaolin and chelating agent and add in 4 batches, stirring each batch for 10 minutes;

[0052] Filtration and shaping: Pressure filtration (0.2μm filter membrane), let it stand for 48 hours to degas.

[0053] 3. Performance Testing

[0054] Fluorescence properties: Displays blue-green fluorescence under ultraviolet light (main peak 435nm, half-peak width 22nm);

[0055] Drying time: 15 minutes for surface drying at 25°C, 2 hours for actual drying;

[0056] Solvent resistance: No swelling or fluorescence attenuation after immersion in ethanol (24 hours).

[0057] As a further elaboration of the present invention, the natural fluorescent gemstone is selected from at least one of ruby, sapphire, diamond and fluorite having a fluorescent effect, and its fluorescent color corresponds to the type of gemstone.

[0058] As a further elaboration of the present invention, the binder is at least one of acrylic resin, nitrocellulose or rosin-modified phenolic resin.

[0059] As a further elaboration of the present invention, the filler is at least one of silicon dioxide, calcium carbonate or kaolin, and its particle size is less than 1 / 2 of the natural gemstone fluorescent pigment.

[0060] As a further elaboration of the present invention, the stabilizer is a compound system of a hindered amine light stabilizer and a metal chelating agent, and the compounding mass ratio is 1:0.5-2.

[0061] A method for preparing a natural gemstone fluorescent anti-counterfeiting ink component comprises the following steps:

[0062] (1) Pre-dispersing the natural gemstone fluorescent pigment and part of the solvent at a rotation speed of 200-500 rpm for 10-30 minutes;

[0063] (2) adding the binder and the remaining solvent, stirring at 500-800 rpm for 30-60 minutes at 40-60°C to form a homogeneous matrix;

[0064] (3) Add filler and stabilizer in 3-5 batches, with an interval of 5-10 minutes between each batch, and stir until the system viscosity reaches 5000-10000 cP;

[0065] (4) The mixture was ground 2-4 times by a three-roll mill, filtered through a 100-200 mesh sieve, and aged for 24-48 hours.

[0066] Wherein, the inter-roller pressure of the three-roll mill in step (4) is 0.2-0.5 MPa, and the temperature is controlled at 25-35°C.

[0067] An anti-counterfeiting verification method, using any of the gemstone fluorescent anti-counterfeiting ink pads to form an imprint on a substrate, and achieving authenticity identification through the following steps:

[0068] (a) Observation of the imprinted area under 365 nm UV light;

[0069] (b) Fluorescence emission spectrum testing: authentic gemstones should show characteristic fluorescence peaks corresponding to the fluorescent pigments used in natural gemstones;

[0070] (c) The relative fluorescence intensity of the genuine product in the 450-650nm band is ≥80cd / m 2 .

[0071] The half-maximum width of the characteristic fluorescence peak in step (b) is ≤35 nm, and the similarity with the standard fluorescence spectrum of the corresponding natural gemstone is ≥90%.

[0072] The above description of the present invention and its embodiments is non-limiting. In short, if a person skilled in the art is inspired by the above description and designs a similar structure and embodiment to the technical solution without departing from the purpose of the present invention, they should fall within the scope of protection of the present invention.

Claims

1. A natural gemstone fluorescent anti-counterfeiting ink component, characterized by: The following components are included in mass percentage: Natural gemstone fluorescent pigment 5-30% Adhesive 20-50% Filler 10-40% Stabilizer 0.5-5% Solvent residue; The natural gem fluorescent pigment is crushed and sieved natural fluorescent gem particles with a particle size range of 1-50 μm, which emit visible fluorescence of 400-700 nm under ultraviolet light excitation.

2. The natural gemstone fluorescent anti-counterfeiting ink component according to claim 1, characterized in that: The natural fluorescent gemstone is selected from at least one of ruby, sapphire, diamond and fluorite having a fluorescent effect, and its fluorescent color corresponds to the type of gemstone.

3. The natural gemstone fluorescent anti-counterfeiting ink component according to claim 1, characterized in that: The adhesive is at least one of acrylic resin, nitrocellulose or rosin-modified phenolic resin.

4. The natural gemstone fluorescent anti-counterfeiting ink component according to claim 1, characterized in that: The filler is at least one of silicon dioxide, calcium carbonate or kaolin, and its particle size is less than 1 / 2 of the natural gem fluorescent pigment.

5. The natural gemstone fluorescent anti-counterfeiting ink component according to claim 1, characterized in that: The stabilizer is a compound system of a hindered amine light stabilizer and a metal chelating agent, and the compounding mass ratio is 1:0.5-2.

6. A method for preparing a natural gemstone fluorescent anti-counterfeiting ink component, characterized in that: The following steps are involved: (1) Pre-dispersing the natural gemstone fluorescent pigment and part of the solvent at a rotation speed of 200-500 rpm for 10-30 minutes; (2) adding the binder and the remaining solvent, stirring at 500-800 rpm for 30-60 minutes at 40-60°C to form a homogeneous matrix; (3) Add filler and stabilizer in 3-5 batches, with an interval of 5-10 minutes between each batch, and stir until the system viscosity reaches 5000-10000 cP; (4) The mixture was ground 2-4 times by a three-roll mill, filtered through a 100-200 mesh sieve, and aged for 24-48 hours.

7. The method for preparing a natural gemstone fluorescent anti-counterfeiting ink component according to claim 6, characterized in that: The pressure between the rollers of the three-roll mill in step (4) is 0.2-0.5 MPa, and the temperature is controlled at 25-35°C.

8. An anti-counterfeiting verification method, characterized in that: The gem fluorescent anti-counterfeiting ink pad according to any one of claims 1 to 5 is used to form an imprint on a substrate, and the authenticity is identified by the following steps: (a) Observation of the imprinted area under 365 nm UV light; (b) Fluorescence emission spectrum testing: authentic gemstones should show characteristic fluorescence peaks corresponding to the fluorescent pigments used in natural gemstones; (c) The relative fluorescence intensity of the genuine product in the 450-650nm band is ≥80cd / m 2 .

9. The anti-counterfeiting verification method according to claim 8, characterized in that: The half-maximum width of the characteristic fluorescence peak in step (b) is ≤35 nm, and the similarity with the standard fluorescence spectrum of the corresponding natural gemstone is ≥90%.