CN114664171A - A magnetic infrared anti-counterfeiting pigment - Google Patents

Abstract

The application discloses a magnetic infrared anti-counterfeiting pigment. The magnetic infrared anti-counterfeiting pigment comprises: the first infrared reflection layer, the magnetic layer and the second infrared reflection layer are sequentially stacked, wherein the thickness of the first infrared reflection layer and/or the second infrared reflection layer is 1500 angstroms to 10000 angstroms, and the thickness of the magnetic layer is as follows: 1000-30000 angstroms. The magnetic infrared anti-counterfeiting pigment has the advantages of simple structure, low cost, magnetic property, anti-counterfeiting combination and stable pure-color structural color.

Description

A magnetic infrared anti-counterfeiting pigment

technical field

The present application relates to the technical field of optical anti-counterfeiting, in particular to a magnetic infrared anti-counterfeiting pigment.

Background technique

In recent years, with the development of anti-counterfeiting technology, a variety of color-changing and special synthetic materials have gradually emerged. Color-changing materials are widely used in traditional visual anti-counterfeiting technology, and more and more invisible anti-counterfeiting technologies are added to color-changing materials, such as infrared anti-counterfeiting and magnetic anti-counterfeiting.

However, the existing anti-counterfeiting pigments have a single effect, and are easily replaced and imitated, and cannot form an effective anti-counterfeiting effect.

SUMMARY OF THE INVENTION

The present application provides a magnetic infrared anti-counterfeiting pigment to solve the technical problem in the prior art that the anti-counterfeiting pigment has a single effect, is easily replaced and imitated, and cannot form an effective anti-counterfeiting effect.

In order to solve the above-mentioned technical problems, a technical solution adopted in the present application is to provide a magnetic infrared anti-counterfeiting pigment, the magnetic infrared anti-counterfeiting pigment comprises: a first infrared reflection layer, a magnetic layer and a second infrared reflection layer arranged in sequence, wherein , the thickness of the first infrared reflection layer and/or the second infrared reflection layer is 1500 angstroms-10000 angstroms, and the thickness of the magnetic layer is: 1000 angstroms-30000 angstroms.

Further, the magnetic infrared anti-counterfeiting pigment has a first feature, and the first feature is that the magnetic infrared anti-counterfeiting pigment has characteristic absorption in an interval with a wavelength greater than 1500 nm and less than 2300 nm, and the magnetic infrared anti-counterfeiting pigment has an interval of 800 nm. -1500nm and 2300nm-36000nm infrared band reflectivity is greater than 80%.

Further, the magnetic infrared anti-counterfeiting pigment has a second feature, and the second feature is that the saturation magnetic susceptibility per unit mass of the magnetic infrared anti-counterfeiting pigment is greater than 1000 m ³ /kg.

Further, the first feature and the second feature are combined by a preset algorithm to form a third feature, and the third feature is used for specific identification.

Further, the material of the magnetic layer includes at least one of iron, nickel, cobalt, gadolinium, terbium, dysprosium and erbium, or an alloy of at least both.

Further, the material of the first infrared reflection layer and/or the second infrared reflection layer may include a material with a refractive index not greater than 1.65 and/or a material with a refractive index greater than 1.65, and the material with a refractive index not greater than 1.65 Including: silica, alumina, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride, lithium fluoride polystyrene, polyethylene , polymethyl methacrylate, polyamideimide, polyperfluoroethylene propylene, tetrafluoroethylene, chlorotrifluoroethylene, cellulose propionate, cellulose acetate, cellulose acetate butyrate, methyl pentene polymer , homopolyoxymethylene, acrylic resin, nitrocellulose, ethyl cellulose, polypropylene, polysulfone, polyethersulfone, mica, heteroisomorphic polymer, polybutene, ionomer, acrylic copolymer, Thermoplastic, styrene butadiene, polyvinyl chloride, urea formaldehyde, styrene acrylonitrile or polycarbonate; the materials with a refractive index greater than 1.65 include: lanthanum titanate, titanium pentoxide, niobium pentoxide, zinc sulfide, oxide Zinc, zirconia, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, triiron tetroxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide , magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide or tungsten trioxide.

Further, the magnetic infrared anti-counterfeiting pigment has a flake structure or a photonic crystal structure.

The beneficial effects of the present application are: different from the situation in the prior art, the magnetic infrared anti-counterfeiting pigment of the present application comprises: a first infrared reflection layer, a magnetic layer and a second infrared reflection layer which are stacked in sequence, wherein the first infrared reflection layer And/or the thickness of the second infrared reflection layer is 1500 angstroms-10000 angstroms, and the thickness of the magnetic layer is: 1000 angstroms-30000 angstroms. The magnetic infrared anti-counterfeiting pigment of the present application has the advantages of simple structure, easy preparation and low cost; in addition, the magnetic infrared anti-counterfeiting pigment of the present application combines magnetic anti-counterfeiting and infrared invisible anti-counterfeiting, has relatively stable solid color structural color, and the color development of the pigment Good performance, high color uniformity.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present application. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of an embodiment of the magnetic infrared anti-counterfeiting pigment provided by the present application.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is particularly pointed out that the following examples are only used to illustrate the present application, but do not limit the scope of the present application. Likewise, the following embodiments are only some of the embodiments of the present application but not all of the embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The orientation or positional relationship indicated by the terms "inside" and "outside" in the description and claims of the present application and the above-mentioned drawings is based on the orientation or positional relationship shown in the drawings, or is based on the usual placement of the product in use when the application is used. The orientation or positional relationship is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present application. limit.

In addition, the terms "first", "second", etc. (if present) in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. . It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion.

Certain nano-sheet magnetic materials with stable performance, good surface state and uniformity can be regarded as high-quality information recording materials when they have a high saturation magnetic susceptibility per unit mass. Combined with infrared characteristics and visible light color characteristics, flake magnetic pigments with multiple anti-counterfeiting properties can be formed. That is, the magnetic pigment can not only perform information recording and reading, infrared feature recognition, but also have the function of color decoration. Based on the above concept, the present application provides a magnetic infrared anti-counterfeiting pigment, which aims to solve the composite application of adding multiple anti-counterfeiting to pure color pigments.

As shown in FIG. 1, FIG. 1 is a schematic structural diagram of an embodiment of a magnetic infrared anti-counterfeiting pigment provided by the present application. The magnetic infrared anti-counterfeiting pigment 10 includes: a first infrared reflection layer 11, a magnetic layer 12 and a The second infrared reflection layer 13 . That is, the outer layer material of the magnetic infrared anti-counterfeiting pigment 10 of the present application uses an infrared reflective material, and the intermediate layer uses a magnetic material.

The thickness of the first infrared reflection layer 11 and/or the second infrared reflection layer 13 is 1500 angstroms to 10000 angstroms, for example, the thickness of the first infrared reflection layer 11 and/or the second infrared reflection layer 13 Angstroms, 1700 Angstroms, 1800 Angstroms, 2000 Angstroms, 3000 Angstroms, 4000 Angstroms, 5000 Angstroms, 7000 Angstroms, 8000 Angstroms or 10000 Angstroms, etc. Specific settings can be selected according to actual needs.

The thickness of the magnetic layer 12 is 1000 angstroms to 30000 angstroms. For example, the thickness of the magnetic layer 12 can be 1000 angstroms, 2000 angstroms, 3000 angstroms, 4000 angstroms, 5000 angstroms, 7000 angstroms, 8000 angstroms, 10000 angstroms, 20000 angstroms or 30000 angstroms. Ai et al. Specific settings can be selected according to actual needs.

The magnetic infrared anti-counterfeiting pigment 10 provided by the present application has a simple structure, is easy to prepare, and has a low cost. Through the above arrangement, the appearance of the magnetic infrared anti-counterfeiting pigment 10 is shown as a solid color, with good color development and high color uniformity, and the tiling property of the pigment can be improved. In addition, the magnetic infrared anti-counterfeiting pigment 10 of the present application is highly reflective to the infrared band, has a specific magnetic signal, and has multiple anti-counterfeiting effects.

Further, the material of the first infrared reflection layer 11 and/or the second infrared reflection layer 13 may include a material with a refractive index not greater than 1.65 and/or a material with a refractive index greater than 1.65. Specifically, materials with a refractive index not greater than 1.65 include: silica, alumina, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride , lithium fluoride polystyrene, polyethylene, polymethyl methacrylate, polyamideimide, polyperfluoroethylene propylene, tetrafluoroethylene, chlorotrifluoroethylene, cellulose propionate, cellulose acetate, butyl acetate Acid cellulose, methyl pentene polymer, homopolyoxymethylene, acrylic resin, nitrocellulose, ethyl cellulose, polypropylene, polysulfone, polyethersulfone, mica, heteromorphic polymer, polybutene, Ionomer, acrylic copolymer, thermoplastic, styrene butadiene, polyvinyl chloride, urea formaldehyde, styrene acrylonitrile or polycarbonate.

Further, materials with a refractive index greater than 1.65 include: lanthanum titanate, titanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, oxide Cerium, yttrium oxide, europium oxide, iron oxide, ferric oxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, nitride Silicon, silicon monoxide, selenium trioxide, tin oxide or tungsten trioxide.

Further, the material of the magnetic layer 12 in the present application may include at least one of iron, nickel, cobalt, gadolinium, terbium, dysprosium and erbium, or an alloy of at least both. For example, the material of the magnetic layer 12 may include an iron-nickel-cobalt alloy, or the material of the magnetic layer 12 may include a cobalt-gadolinium alloy or the like.

Further, the magnetic infrared anti-counterfeiting pigment 10 can be prepared by chemical vapor deposition method, sputtering method, solution coating method, electron beam evaporation method, ion plating method, dipping method, chemical synthesis, sintering or spraying method. The above-mentioned specific preparation method is a category that can be understood by those skilled in the art, and will not be described in detail here.

Further, the magnetic infrared anti-counterfeiting pigment 10 of the present application is highly reflective to the infrared band, and has a specific magnetic signal. The value of the magnetic index can be tested with a special instrument, and a specific algorithm can be used to cooperate with the infrared test data, and encrypted and decrypted by a key to achieve specific identification. Optionally, the magnetic index may include saturation susceptibility per mass.

Specifically, the magnetic infrared anti-counterfeiting pigment 10 has a first feature. The first feature is that the magnetic infrared anti-counterfeiting pigment 10 has characteristic absorption in the range of wavelengths greater than 1500 nm and less than 2300 nm, and the magnetic infrared anti-counterfeiting pigment 10 has a range of 800nm-1500nm and The reflectivity in the infrared band of 2300nm-36000nm is greater than 80%. That is, the magnetic infrared anti-counterfeiting pigment 10 is highly reflective to the infrared wavelength band.

The magnetic infrared anti-counterfeiting pigment 10 also has a second feature. For example, the second feature is that the saturation magnetic susceptibility per unit mass of the magnetic infrared anti-counterfeiting pigment 10 is greater than 1000 m ³ /kg.

The first feature and the second feature of the above-mentioned magnetic infrared anti-counterfeiting pigment 10 are combined through a preset algorithm to form a third feature, which can be used for specific identification to improve the anti-counterfeiting effect of the pigment. In a specific embodiment, the characteristic absorption spectrum and characteristic magnetic index of the pigment are normalized and fitted, and a database can be established qualitatively and quantitatively after fitting. for specific identification. In other embodiments, the first feature and the second feature may also be combined by other algorithms to perform specific identification, which will not be listed here. Therefore, the magnetic infrared anti-counterfeiting pigment 10 of the present application has a better anti-counterfeiting effect.

In this embodiment, the magnetic infrared anti-counterfeiting pigment 10 can be fabricated into a sheet-like structure. In other embodiments, the magnetic infrared anti-counterfeiting pigment 10 can also be made into a photonic crystal or a pearlescent magnetic pigment, so that the same characteristic effect can also be achieved.

In summary, the magnetic infrared anti-counterfeiting pigment 10 of the present application is a combination of a magnetic pigment and an infrared high-reflection pigment. The magnetic infrared anti-counterfeiting pigment 10 has a simple structure, is easy to prepare, and has low cost, and can realize the combination of magnetic and infrared anti-counterfeiting. , to improve the anti-counterfeiting effect of the pigment, and has a stable solid color structural color.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied to other related technologies Fields are similarly included within the scope of patent protection of this application.

Claims (7)

1. A magnetic infrared anti-counterfeiting pigment is characterized by comprising:

the infrared reflection device comprises a first infrared reflection layer, a magnetic layer and a second infrared reflection layer which are sequentially stacked, wherein the thickness of the first infrared reflection layer and/or the second infrared reflection layer is 1500-10000 angstroms, and the thickness of the magnetic layer is as follows: 1000 angstroms to 30000 angstroms.

2. The magnetic infrared anti-counterfeiting pigment according to claim 1, wherein the magnetic infrared anti-counterfeiting pigment has a first characteristic that the magnetic infrared anti-counterfeiting pigment has characteristic absorption in an interval with a wavelength of more than 1500nm and less than 2300nm, and the magnetic infrared anti-counterfeiting pigment has a reflectivity of more than 80% in infrared bands with an interval of 800nm to 1500nm and 2300nm to 36000 nm.

3. The magnetic infrared security pigment of claim 2, wherein the magnetic infrared security pigment has a second characteristic that the magnetic infrared security pigment has a saturation magnetic susceptibility per unit mass of more than 1000m³/kg。

4. A magnetic infrared security pigment according to claim 3, wherein the first feature and the second feature are combined by a predetermined algorithm to form a third feature, and the third feature is used for specific identification.

5. A magnetic infrared security pigment according to claim 1, wherein the material of the magnetic layer comprises at least one of iron, nickel, cobalt, gadolinium, terbium, dysprosium, and erbium, or an alloy of at least two thereof.

6. A magnetic infrared anti-counterfeiting pigment according to claim 1, characterized in that the material of the first infrared reflecting layer and/or the second infrared reflecting layer comprises a material with a refractive index of not more than 1.65 and/or a material with a refractive index of more than 1.65,

the material having a refractive index of not more than 1.65 includes: silica, alumina, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride, lithium fluoride polystyrene, polyethylene, polymethyl methacrylate, polyamideimide, polyperfluoroethylpropylene, tetrafluoroethylene, chlorotrifluoroethylene, cellulose propionate, cellulose acetate butyrate, methylpentene polymer, homopolyformaldehyde, acrylic resin, cellulose nitrate, ethyl cellulose, polypropylene, polysulfone, polyethersulfone, mica, a heteroisomorphous polymer, polybutene, an ionomer, an acrylic copolymer, a thermoplastic, styrene butadiene, polyvinyl chloride, urea formaldehyde, styrene acrylonitrile, or a polycarbonate;

the material having a refractive index greater than 1.65 comprises: lanthanum titanate, trititanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, triiron tetroxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide, or tungsten trioxide.

7. The magnetic infrared anti-counterfeiting pigment according to claim 1, wherein the magnetic infrared anti-counterfeiting pigment is of a flake structure or a photonic crystal structure.

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