Invisible anti-counterfeiting ceramic tile and preparation method thereof

Abstract

The invention discloses an invisible anti-counterfeiting ceramic tile and a preparation method thereof. The invisible anti-counterfeiting ceramic tile sequentially comprises a green body, a cover glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer from bottom to top, the invisible anti-counterfeiting code layer is formed by ink-jet printing of ceramic ink containing an invisible color-changing material, and the invisible color-changing material is a photoluminescent material doped with rare earth elements. According to the invention, the invisible anti-counterfeiting code is arranged in the glaze layer and is not easy to wear after being sintered at high temperature; and the pattern of the pattern decoration layer is not influenced. Meanwhile, the invisible anti-counterfeiting code adopts a rare earth element doped photoluminescent material as an invisible color-changing material, is invisible under the irradiation of visible light or common light, and shows a color development effect only under the irradiation of light with a specific wavelength. The invisible color-changing material disclosed by the invention has a good fluorescence concentration effect, and can effectively reduce the coverage effect of dark color, so that invisible codes can be clearly displayed on dark-color bricks, and the application range of the invisible anti-counterfeiting codes is greatly widened.

Description

Technical Field

[0001] The invention belongs to the technical field of building ceramics, and in particular relates to an invisible anti-counterfeiting ceramic tile and a preparation method thereof. Background Art

[0002] With the continuous development of the building ceramics industry and the continuous growth of ceramic tile production, in order to prevent the emergence of counterfeiting and channeling, and to maintain the brand image of ceramic companies, ceramic companies often print anti-counterfeiting labels or bottom labels on their products. Traditional anti-counterfeiting labels are generally printed on the finished ceramic tiles or on the bottom of a layer of QR code or digital code, but this anti-counterfeiting label is easy to wear, and it is difficult to trace the source of the product after use, so it is difficult to achieve the purpose of anti-counterfeiting; another anti-counterfeiting method is the bottom label. On the one hand, some ceramic tiles (such as ceramic rock slabs) are difficult to achieve a pressed bottom label, and on the other hand, the bottom label is very easy to imitate, so it is also difficult to achieve the purpose of true anti-counterfeiting.

[0003] Therefore, there is an urgent need to develop a new anti-counterfeiting method for ceramic tiles, which will not affect the decorative effect of the ceramic tiles, will not be worn during use, and will not be easily imitated, so as to better play the anti-counterfeiting role. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides an invisible anti-counterfeiting ceramic tile and a preparation method thereof. The invisible anti-counterfeiting ceramic tile will not be worn during use and is not easy to be imitated while ensuring the decorative effect, and is applicable to both light-colored and dark-colored ceramic tiles.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides an invisible anti-counterfeiting ceramic tile, which includes, from bottom to top, a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer; the invisible anti-counterfeiting code layer is inkjet printed by ceramic ink containing invisible color-changing material, and the invisible color-changing material is a photoluminescent material doped with rare earth elements.

[0006] Specifically, the invisible anti-counterfeiting ceramic tile of the present invention sets the invisible anti-counterfeiting code in the glaze layer, and after high-temperature firing, it is not easy to be worn under the protection of the outer transparent dry granular glaze. At the same time, the invisible anti-counterfeiting code of the present invention adopts a photoluminescent material doped with rare earth elements as an invisible color-changing material. The invisible color-changing material is transparent after high-temperature firing, and is invisible under the irradiation of visible light or ordinary light (such as fluorescent lamps, LED lamps, etc.). It only shows a color-developing effect under the irradiation of light of a specific wavelength (such as ultraviolet light). Therefore, the invisible anti-counterfeiting code layer of the present invention will not affect the pattern of the pattern decoration layer, and has a good anti-counterfeiting effect.

[0007] In some embodiments of the present invention, the invisible color-changing material is selected from at least one of lanthanum-doped europium oxide, bismuth-europium-doped yttrium oxide, europium-doped strontium aluminate, and europium-doped zinc gallate.

[0008] Specifically, dark colors, especially black ceramic tiles, have a certain covering effect on the color development of photoluminescent materials, resulting in poor color development or even failure to develop color. The present invention uses photoluminescent materials doped with rare earth elements as raw material components of invisible anti-counterfeiting codes, wherein: photoluminescent materials doped with rare earth elements lanthanum, europium, and bismuth, such as lanthanum doped europium oxide, bismuth europium doped yttrium oxide, europium doped strontium aluminate, and europium doped zinc gallate, have good fluorescence concentration effects. The doped photoluminescent materials have a higher luminous intensity than traditional photoluminescent materials, such as rare earth oxides such as europium oxide and yttrium oxide, under the irradiation of light of a specific wavelength of 320-385nm, so that the color development of the prepared invisible anti-counterfeiting code is brighter and clearer. Therefore, the present invention uses a specific invisible color-changing material, which can effectively reduce the covering effect of dark colors, so that the invisible anti-counterfeiting code can also be displayed more clearly on dark bricks, greatly broadening the scope of application of the invisible anti-counterfeiting code.

[0009] In some embodiments of the present invention, the particle size of the invisible color-changing material is 2000-3000 mesh. The invisible color-changing material with a fine particle size is more conducive to the clarity and brightness of the color display.

[0010] In some embodiments of the present invention, the doping amount of the rare earth element is 0.3-1 wt %.

[0011] In some embodiments of the present invention, the content of the invisible color-changing material in the ceramic ink is 10-50 wt %.

[0012] Specifically, in order to ensure the clarity and recognizability of the invisible anti-counterfeiting code on each ceramic tile, the content of invisible color-changing materials in the ceramic ink must be strictly controlled to ensure that the invisible anti-counterfeiting codes printed on ceramic tiles of different colors can be clearly displayed under 320-385nm light, so as to facilitate the subsequent reading and identification of relevant information of the invisible anti-counterfeiting code by scanning the code.

[0013] In some embodiments of the present invention, the invisible anti-counterfeiting code layer contains a QR code.

[0014] In some embodiments of the present invention, the invisible anti-counterfeiting code layer further contains a trademark (logo) and / or a digital code, and the digital code is consistent with the digital information obtained by reading the two-dimensional code.

[0015] In some embodiments of the present invention, the side of the invisible anti-counterfeiting ceramic tile is printed with a side digital code, and the side digital code is consistent with the digital information obtained by identifying the two-dimensional code, that is, the side digital code is the same as the digital code contained in the invisible anti-counterfeiting code. The side digital code is more convenient for tracing the source of later products.

[0016] Specifically, the logo, QR code and digital code can be automatically generated by the equipment, and then printed on the ceramic tiles by inkjet printing. Each ceramic tile has an independent corresponding QR code and digital code, that is, one brick and one code, which can realize anti-counterfeiting and traceability of each ceramic tile.

[0017] The second aspect of the present invention provides a method for preparing the invisible anti-counterfeiting ceramic tile, comprising the following steps:

[0018] The surface of the blank is sequentially coated with glaze, inkjet printed patterns and invisible anti-counterfeiting codes; transparent dry particles are then dry-applied and shaping glue is sprayed to sequentially form a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer; after drying and firing, the invisible anti-counterfeiting code ceramic tile is obtained.

[0019] Specifically, since the inks for the inkjet printed pattern and the invisible anti-counterfeiting code are both oily, and the ink for the inkjet printed invisible anti-counterfeiting code has a high solid content and strong oiliness; if the outer transparent glaze is applied by conventional wet glazing, it is easy to cause serious ink discharge in the printed area of ​​the invisible anti-counterfeiting code, forming obvious sinking defects. In view of this, the present invention adopts dry application of transparent dry particles, which can effectively prevent defects caused by ink discharge in the invisible anti-counterfeiting code area.

[0020] In some embodiments of the present invention, the particle size of the transparent dry particles is 300-2500 mesh.

[0021] In some embodiments of the present invention, the grayscale of the invisible anti-counterfeiting code is ≥ 20%.

[0022] Specifically, the grayscale of the invisible anti-counterfeiting code is determined by the amount of ink used in inkjet printing. If the grayscale is too low, the invisible anti-counterfeiting code will be difficult to identify. In addition, there are certain differences in the grayscale of invisible anti-counterfeiting codes printed on ceramic tiles of different colors. For example, light-colored ceramic tiles can print anti-counterfeiting codes with lower grayscale, which can also be more obvious, but dark-colored ceramic tiles, especially black ceramic tiles, need to print invisible anti-counterfeiting codes with higher grayscale. Therefore, by controlling the grayscale of the invisible anti-counterfeiting code inkjet printing, the color rendering effect of the invisible anti-counterfeiting code can be guaranteed to meet the application requirements of ceramic tiles of different colors.

[0023] In some embodiments of the present invention, the maximum sintering temperature is 1100-1250°C.

[0024] In some embodiments of the present invention, the preparation method further includes the step of printing a side digital code on the side of the fired invisible anti-counterfeiting ceramic tile, and the side digital code is consistent with the digital information obtained by reading the two-dimensional code in the invisible anti-counterfeiting code.

[0025] Specifically, the invisible anti-counterfeiting QR code on the surface of the ceramic tile can be photographed by a camera and read by the device, and then the relevant information read (including product information, digital code, etc.) can be automatically entered, and then the read digital code can be printed on the side of the ceramic tile. In the later use process, the information recognized by the device can be associated with the product, realizing anti-counterfeiting and facilitating traceability, achieving the purpose of preventing counterfeiting and channeling.

[0026] The present invention has no special requirements for the components of the green body, the glaze and the transparent dry particles, and the green body, the glaze and the transparent dry particles of ordinary ceramic tiles can be used.

[0027] Compared with the prior art, the above technical solution of the present invention has at least the following technical effects or advantages:

[0028] (1) The invisible anti-counterfeiting ceramic tile of the present invention includes a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer from bottom to top, that is, the invisible anti-counterfeiting code is set in the glaze layer, and after high-temperature firing, it is not easy to be worn under the protection of the outer layer of transparent dry particle glaze. At the same time, the invisible anti-counterfeiting code uses a photoluminescent material doped with rare earth elements as an invisible color-changing material. The invisible color-changing material is transparent after high-temperature firing and is invisible under the irradiation of visible light or ordinary light. It only shows a color-developing effect under the irradiation of light with a specific wavelength, so it will not affect the pattern of the pattern decoration layer. In addition, the invisible color-changing material of the present invention has a good fluorescence concentration effect, which can effectively reduce the covering effect of dark colors, so that the invisible code can also be displayed more clearly on dark bricks, greatly broadening the scope of application of the invisible anti-counterfeiting code.

[0029] (2) When preparing the invisible anti-counterfeiting ceramic tile of the present invention, transparent dry particles are applied by dry method and are shaped by glue, which effectively prevents defects caused by ink sinking due to heavy oiliness of the pattern decoration layer and the invisible anti-counterfeiting code layer.

[0030] (3) The invisible anti-counterfeiting ceramic tile of the present invention has an invisible anti-counterfeiting code on its surface that can be photographed by a camera and read by a device, and then the read product-related information can be automatically entered. After the product is shipped out, the product-related information recognized by the device can be associated with the product, so that each piece of ceramic tile has an independent QR code. Even if the ceramic tile is laid, it can be identified by the invisible anti-counterfeiting code on its brick surface. The relevant information read by the QR code of the corresponding product can also be printed on the side of the ceramic tile, carton packaging and wooden pallet, so as to achieve anti-counterfeiting and convenient traceability, and achieve the purpose of preventing counterfeiting and channeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The actual pictures of the invisible anti-counterfeit ceramic brick prepared in Example 1 before and after irradiation with ultraviolet light (the left picture is the brick surface without ultraviolet light irradiation, and the right picture is the brick surface under ultraviolet light irradiation);

[0032] Figure 2 The actual pictures of the invisible anti-counterfeit ceramic brick prepared in Example 2 before and after irradiation with ultraviolet light (the left picture is the brick surface without ultraviolet light irradiation, and the right picture is the brick surface under ultraviolet light irradiation);

[0033] Figure 3 The actual pictures of the invisible anti-counterfeit ceramic brick prepared in Example 3 before and after irradiation with ultraviolet light (the left picture is the brick surface without ultraviolet light irradiation, and the right picture is the brick surface under ultraviolet light irradiation);

[0034] Figure 4 The actual pictures of the invisible anti-counterfeiting ceramic brick prepared in Comparative Example 1 before and after irradiation with ultraviolet light (the left picture is the brick surface without ultraviolet light irradiation, and the right picture is the brick surface under ultraviolet light irradiation);

[0035] Figure 5 The actual pictures of the invisible anti-counterfeiting ceramic brick prepared in Comparative Example 2 before and after irradiation with ultraviolet light (the left picture shows the brick surface without ultraviolet light irradiation, and the right picture shows the brick surface with ultraviolet light irradiation);

[0036] Figure 6 These are actual pictures of the invisible anti-counterfeit ceramic tiles prepared in Comparative Example 3 before and after irradiation with ultraviolet light (the left picture shows the tile surface without ultraviolet light irradiation, and the right picture shows the tile surface with ultraviolet light irradiation). DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with the examples, so that the technical personnel of the relevant technical field can understand the present invention. It is necessary to point out here that the examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. The non-essential improvements and adjustments made to the present invention by the skilled person in the relevant field according to the above invention content should still belong to the scope of protection of the present invention. At the same time, the raw materials mentioned below that are not described in detail are all commercially available products; the process steps or preparation methods that are not mentioned in detail are all process steps or preparation methods known to those skilled in the art.

[0038] The chemical composition of the glaze used in the following examples and comparative examples includes, by weight percentage: 56% SiO2, 32% Al2O3, 0.5% Fe2O3, 1% CaO, 1% MgO, 2% K2O, 4% Na2O, and 3.5% loss on ignition. The transparent dry granules are the transparent dry granules of Yidajia Ceramic Glaze Co., Ltd.

[0039] Example 1

[0040] The utility model discloses an invisible anti-counterfeiting ceramic tile, which comprises, from bottom to top, a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer.

[0041] The invisible anti-counterfeiting code layer is formed by inkjet printing of ceramic ink containing invisible color-changing materials. The raw material components of the ceramic ink include, by weight percentage: 30% of lanthanum-doped europium oxide with a particle size of 2000-3000 mesh (the doping amount of lanthanum is 0.5wt%), 62% of diisooctyl adipate, 5% of isopropanol; and 3% of Qianyou superdispersant AKN-298. A method for preparing invisible anti-counterfeiting ceramic tiles comprises the following steps:

[0042] (1) Applying a glaze on the surface of the body in sequence and spraying a light-colored pattern; then using the ceramic ink containing the invisible color-changing material to inkjet print a trademark (OCEANO), a two-dimensional code and a digital code, the digital code being consistent with the digital code information obtained by recognizing the two-dimensional code; then applying transparent dry particles (with a particle size of 1500 meshes) by a dry method, spraying a shaping glue, and sequentially forming a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer (with a grayscale of 30%) and a transparent dry particle layer, drying, and firing at 1150° C. for 60 minutes to obtain a ceramic tile containing an invisible anti-counterfeiting code;

[0043] (2) Print a side digital code on the side of the ceramic tile obtained in step (1), and the side digital code is the same as the digital code in the invisible anti-counterfeiting code layer, so as to obtain the invisible anti-counterfeiting ceramic tile of this embodiment. The ceramic tile has no obvious invisible anti-counterfeiting code imprint defect on the tile surface under visible light, see Figure 1 Left picture.

[0044] The invisible anti-counterfeiting ceramic tile prepared in Example 1 was irradiated with a 365nm ultraviolet lamp on the invisible anti-counterfeiting code on the tile surface. The trademark (OCEANO), the two-dimensional code and the digital code in the invisible anti-counterfeiting area were bright and clear; the two-dimensional code had high brightness and could be clearly identified. Figure 1 Right picture.

[0045] Example 2

[0046] The utility model discloses an invisible anti-counterfeiting ceramic tile, which comprises, from bottom to top, a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer.

[0047] The invisible anti-counterfeiting code layer is formed by inkjet printing of ceramic ink containing invisible color-changing material. The raw material components of the ceramic ink include, by weight percentage: 40% of europium-doped strontium aluminate with a particle size of 2000-3000 mesh (the europium doping amount is 0.5wt%), 63% of isooctyl laurate, 3% of isopropyl alcohol; and 4% of Qianyou super dispersant AKN-298.

[0048] A method for preparing invisible anti-counterfeiting ceramic tiles comprises the following steps:

[0049] (1) Applying a glaze on the surface of the body in sequence and spraying a dark pattern; then using the ceramic ink containing the invisible color-changing material to inkjet print a trademark (OCEANO), a two-dimensional code and a digital code, the digital code being consistent with the digital code information obtained by recognizing the two-dimensional code; then applying transparent dry particles (with a particle size of 1000 meshes) by a dry method, spraying a shaping glue, and sequentially forming a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer (with a grayscale of 40%) and a transparent dry particle layer, drying, and firing at 1200° C. for 60 minutes to obtain a ceramic tile containing an invisible anti-counterfeiting code;

[0050] (2) Printing a side digital code on the side of the ceramic tile obtained in step (1), and the side digital code is the same as the digital code in the invisible anti-counterfeiting code layer, to obtain the invisible anti-counterfeiting ceramic tile of this embodiment, which has no obvious invisible anti-counterfeiting code imprint defect on the tile surface under visible light, see Figure 2 Left picture.

[0051] The invisible anti-counterfeiting ceramic tile prepared in Example 2 was irradiated with a 365nm ultraviolet lamp on the invisible anti-counterfeiting code on the tile surface. The trademark (OCEANO), the two-dimensional code and the digital code in the invisible anti-counterfeiting area were bright and clear; the two-dimensional code had high brightness and could be clearly identified. Figure 2 Right picture.

[0052] Example 3

[0053] The utility model discloses an invisible anti-counterfeiting ceramic tile, which comprises, from bottom to top, a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer.

[0054] Among them: the invisible anti-counterfeiting code layer is formed by inkjet printing of ceramic ink containing invisible color-changing material, and the raw material components of the ceramic ink include, by weight percentage: 30% of europium-doped zinc gallate with a particle size of 2000-3000 mesh (the europium doping amount is 0.5wt%), 64% of isooctyl laurate, 3% of isopropyl alcohol; 3% of Qianyou super dispersant AKN-298.

[0055] A method for preparing invisible anti-counterfeiting ceramic tiles comprises the following steps:

[0056] (1) Applying a glaze on the surface of the body in sequence and spraying a brown-black pattern; then using the ceramic ink containing the invisible color-changing material to inkjet print a trademark (OCEANO), a two-dimensional code and a digital code, the digital code being consistent with the digital code information obtained by recognizing the two-dimensional code; then applying transparent dry particles (with a particle size of 500 meshes) by a dry method, spraying a shaping glue, and sequentially forming a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer (with a grayscale of 50%) and a transparent dry particle layer, drying, and firing at 1150° C. for 60 minutes to obtain a ceramic tile containing an invisible anti-counterfeiting code;

[0057] (2) Printing a side digital code on the side of the ceramic tile obtained in step (1), and the side digital code is the same as the digital code in the invisible anti-counterfeiting code layer, to obtain the invisible anti-counterfeiting ceramic tile of this embodiment, which has no obvious invisible anti-counterfeiting code imprint defect on the tile surface under visible light, see Figure 3 Left picture.

[0058] The invisible anti-counterfeiting ceramic tile prepared in Example 3 was irradiated with a 365nm ultraviolet lamp on the invisible anti-counterfeiting code on the tile surface. The trademark (OCEANO), the two-dimensional code and the digital code in the invisible anti-counterfeiting area were bright and clear; the two-dimensional code had high brightness and could be clearly identified. Figure 3 Right picture.

[0059] Comparative Example 1

[0060] The difference between Comparative Example 1 and Example 1 is that the invisible color-changing material is europium oxide.

[0061] The utility model discloses an invisible anti-counterfeiting ceramic tile, which comprises, from bottom to top, a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer.

[0062] The invisible anti-counterfeiting code layer is formed by inkjet printing of ceramic ink containing invisible color-changing material. The raw material components of the ceramic ink include, by weight percentage: 30% of europium oxide with a particle size of 2000-3000 mesh, 62% of diisooctyl adipate, 5% of isopropyl alcohol, and 3% of Qianyou super dispersant AKN-298.

[0063] A method for preparing invisible anti-counterfeiting ceramic tiles comprises the following steps:

[0064] (1) Applying a glaze on the surface of the body in sequence and spraying a light-colored pattern; then using the ceramic ink containing the invisible color-changing material to inkjet print a trademark (OCEANO), a two-dimensional code and a digital code, the digital code being consistent with the digital code information obtained by recognizing the two-dimensional code; then applying transparent dry particles (with a particle size of 1500 meshes) by a dry method, spraying a shaping glue, and sequentially forming a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer (with a grayscale of 30%) and a transparent dry particle layer, drying, and firing at 1150° C. for 60 minutes to obtain a ceramic tile containing an invisible anti-counterfeiting code;

[0065] (2) Printing a side digital code on the side of the ceramic tile obtained in step (1), and the side digital code is the same as the digital code in the invisible anti-counterfeiting code layer, to obtain the invisible anti-counterfeiting ceramic tile of this comparative example, which has no obvious invisible anti-counterfeiting code imprint defect on the tile surface under visible light, see Figure 4 Left picture.

[0066] The invisible anti-counterfeiting ceramic tile prepared in Comparative Example 1 was irradiated with a 365nm ultraviolet lamp on the invisible anti-counterfeiting code on the tile surface. The trademark (OCEANO), the QR code and the digital code in the invisible anti-counterfeiting area were clearly displayed; the brightness of the QR code was low and it could be recognized, but the recognition sensitivity was poor. Figure 4 Right picture.

[0067] Comparative Example 2

[0068] The difference between Comparative Example 2 and Comparative Example 1 is that the pattern decoration layer is brown-black.

[0069] The utility model discloses an invisible anti-counterfeiting ceramic tile, which comprises, from bottom to top, a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer.

[0070] The invisible anti-counterfeiting code layer is formed by inkjet printing of ceramic ink containing invisible color-changing material. The raw material components of the ceramic ink include, by weight percentage: 30% of europium oxide with a particle size of 2000-3000 mesh, 62% of diisooctyl adipate, 5% of isopropyl alcohol, and 3% of Qianyou super dispersant AKN-298.

[0071] A method for preparing invisible anti-counterfeiting ceramic tiles comprises the following steps:

[0072] (1) Applying a glaze on the surface of the body in sequence and spraying a brown-black pattern; then using the ceramic ink containing the invisible color-changing material to inkjet print a trademark (OCEANO), a two-dimensional code and a digital code, the digital code being consistent with the digital code information obtained by identifying the two-dimensional code; then applying transparent dry particles (with a particle size of 1500 meshes) by a dry method, spraying a shaping glue, and sequentially forming a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer (with a grayscale of 30%) and a transparent dry particle layer, drying, and firing at 1150° C. for 60 minutes to obtain a ceramic tile containing an invisible anti-counterfeiting code;

[0073] (2) Printing a side digital code on the side of the ceramic tile obtained in step (1), and the side digital code is the same as the digital code in the invisible anti-counterfeiting code layer, to obtain the invisible anti-counterfeiting ceramic tile of this comparative example, which has no obvious invisible anti-counterfeiting code imprint defect on the tile surface under visible light, see Figure 5 Left picture.

[0074] The invisible anti-counterfeiting ceramic tile prepared in Comparative Example 2 was irradiated with a 365nm ultraviolet lamp on the invisible anti-counterfeiting code on the tile surface. The trademark (OCEANO) and the digital code in the invisible anti-counterfeiting area failed to appear; and the QR code was blurred and could not be identified. Figure 5 Right picture.

[0075] Comparative Example 3

[0076] The difference between Comparative Example 3 and Example 1 is that the transparent dry particle layer is applied by wet spraying.

[0077] The utility model discloses an invisible anti-counterfeiting ceramic tile, which comprises, from bottom to top, a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer.

[0078] The invisible anti-counterfeiting code layer is formed by inkjet printing of ceramic ink containing invisible color-changing material. The raw material components of the ceramic ink include, by weight percentage: 30% lanthanum-doped europium oxide with a particle size of 2000-3000 mesh (the doping amount of lanthanum is 0.5wt%), 62% diisooctyl adipate, 5% isopropanol; 3% Qianyou super dispersant AKN-298.

[0079] A method for preparing invisible anti-counterfeiting ceramic tiles comprises the following steps:

[0080] (1) Applying a glaze on the surface of the body in sequence and spraying a light gray pattern; then using the ceramic ink containing the invisible color-changing material to inkjet print a trademark (OCEANO), a two-dimensional code and a digital code, the digital code being consistent with the digital code information obtained by identifying the two-dimensional code; then using a wet method to spray a transparent dry particle (particle size of 1500 mesh) suspension to sequentially form a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer (grayscale of 30%) and a transparent dry particle layer, drying, and sintering at 1150° C. for 60 minutes to obtain a ceramic tile containing an invisible anti-counterfeiting code;

[0081] (2) Printing a side digital code on the side of the ceramic tile obtained in step (1), and the side digital code is the same as the digital code in the invisible anti-counterfeiting code layer, to obtain the invisible anti-counterfeiting ceramic tile of this comparative example, which has an obvious two-dimensional code imprint depression defect visible on the brick surface under visible light, see Figure 6 Left picture.

[0082] The invisible anti-counterfeiting ceramic tile prepared in Comparative Example 3 was irradiated with a 365nm ultraviolet lamp on the invisible anti-counterfeiting code on the tile surface. The trademark (OCEANO) in the invisible anti-counterfeiting area failed to appear, the digital code was not clear, and the QR code was blurred and could not be recognized. Figure 6 Right picture.

[0083] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, without having to go through creative labor. Therefore, simple improvements made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the protection scope of the present invention. The above embodiments are preferred embodiments of the present invention, and all processes similar to the present invention and equivalent changes made should belong to the protection scope of the present invention.

Claims

1. An invisible anti-counterfeiting ceramic tile, characterized in that: From bottom to top, it includes a body, a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer. The invisible anti-counterfeiting code layer is inkjet printed with ceramic ink containing invisible color-changing material, and the invisible color-changing material is a photoluminescent material doped with rare earth elements.

2. The invisible anti-counterfeiting ceramic tile according to claim 1, characterized in that: The invisible color-changing material is selected from at least one of lanthanum-doped europium oxide, bismuth-europium-doped yttrium oxide, europium-doped strontium aluminate, and europium-doped zinc gallate; and / or the particle size of the invisible color-changing material is 2000-3000 mesh.

3. The invisible anti-counterfeiting ceramic tile according to claim 1 or 2, characterized in that: In the invisible color-changing material, the doping amount of the rare earth element is 0.3-1wt%.

4. The invisible anti-counterfeiting ceramic tile according to claim 1, characterized in that: The content of the invisible color-changing material in the ceramic ink is 10-50wt%.

5. The invisible anti-counterfeiting ceramic tile according to claim 1, characterized in that: The invisible anti-counterfeiting code layer contains a two-dimensional code.

6. The invisible anti-counterfeiting ceramic tile according to claim 5, characterized in that: A side digital code is printed on the side of the invisible anti-counterfeiting ceramic tile, and the side digital code is consistent with the digital information obtained by identifying the two-dimensional code.

7. A method for preparing the invisible anti-counterfeiting ceramic tile according to any one of claims 1 to 6, characterized in that: The following steps are involved: The surface of the blank is sequentially coated with glaze, inkjet printed patterns and invisible anti-counterfeiting codes; transparent dry particles are then dry-applied and shaping glue is sprayed to sequentially form a glaze layer, a pattern decoration layer, an invisible anti-counterfeiting code layer and a transparent dry particle layer; after drying and firing, the invisible anti-counterfeiting ceramic tile is obtained.

8. The method for preparing invisible anti-counterfeit ceramic tiles according to claim 7, characterized in that: The particle size of the transparent dry particles is 300-2500 meshes.

9. The method for preparing invisible anti-counterfeiting ceramic tiles according to claim 7, characterized in that: The grayscale of the invisible anti-counterfeiting code is ≥20%.

10. The method for preparing invisible anti-counterfeit ceramic tiles according to claim 7, characterized in that: The maximum sintering temperature is 1100-1250°C.

Images