Shallow slot type graphic structure, colored three-dimensional image nano-printed product and preparation method

Abstract

The present application discloses a kind of shallow slot type graphic structure, a kind of colored stereoscopic image nano printing product and its preparation method.A kind of shallow slot type graphic structure includes: substrate layer, at least one hydrophobic graphic layer, nano pigment layer;The hydrophobic graphic layer includes at least one graphic unit, the graphic unit includes a plurality of micro-nano structures, the micro-nano structure is groove, or the micro-nano structure is provided with groove, or adjacent the micro-nano structure gap forms groove;Nano pigment layer is arranged in the groove, and the nano pigment layer includes nano pigment particles, the nano pigment particles are bonded with the surface of the groove by Van der Waals force, form interface adsorption, for presenting color.Due to interface adsorption, the groove does not need to fill, reduce the use of material, while the firmness of interface adsorption is greater, so shallow slot type groove can be made, and the thickness of hydrophobic graphic layer is smaller.And use nano pigment particles, rather than ink, avoid the use of organic solvent, reduce the risk of environmental pollution, meet the requirements of sustainable development.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nano-printing product design, in particular to a shallow groove type graphic structure and a preparation method, a colored three-dimensional image nano-printing product and a preparation method. BACKGROUND

[0002] In the existing field of packaging printing, the groove type structure is required to be high, and the groove type structure with specific depth and width is required to be filled with nano ink to realize color. In the case of shallow groove type structure, the ink is easy to fall off in the subsequent process, resulting in poor coloring.

[0003] In the existing three-dimensional imaging anti-counterfeiting technology, the multi-color effect of microlens imaging usually adopts the process of multiple UV replication of multi-layer microstructure combined with nano ink filling. Specifically, the realization of color depends on the filling of nano ink in the micrographic groove, and this method has high requirements for the depth and width of the groove, resulting in the need for each layer of micrographic structure to meet certain depth and width requirements. In this way, each replication of micrographic structure increases the overall thickness, making the cumulative thickness of multi-layer structure significantly increase. The increase in thickness will cause the imaging focal length to change, making it difficult to maintain clear imaging effect in a small focal length range, thereby limiting the precision and application range of microlens imaging. In the field of printing packaging, the color of the dynamic three-dimensional anti-counterfeiting image is single, the imaging contrast is not high, and the color display effect is poor, which is difficult to meet the requirements of high imaging contrast and saturation.

[0004] Traditional inks usually use petroleum-based resins as the main component, and add various organic solvents, pigments and additives. Although these inks have good printing performance, they release a large amount of volatile organic compounds (VOCs) during production and use, not only polluting the air, but also threatening human health. In addition, the ink in waste printed matter is difficult to degrade naturally, and may cause secondary pollution when landfill or incineration, further exacerbating environmental problems.

[0005] Chinese invention patent CN103236222B discloses a security film based on integrated imaging principle and having dynamic three-dimensional effect, which gives a relatively complex three-dimensional unit image array layer and sets a three-dimensional micro-nano structure, which is difficult to realize in actual production practice. At the same time, it is pointed out that the unit image is a single color image or a multi-color image; when the unit image is a multi-color image, it can be produced by single or multi-layer nano structure, or by using color-changing ink. However, in actual production, nano-level image production technology is not mature, and color-changing ink only changes with angle and cannot directly bring multiple images, especially images with specific color requirements. SUMMARY

[0006] Based on this, the present application provides a kind of shallow slot type graphics structure, comprising: substrate layer, at least one hydrophobic graphics layer, nano pigment layer;The hydrophobic graphics layer is arranged on one side of the substrate layer, the hydrophobic graphics layer includes at least one graphics unit, the graphics unit includes multiple micro-nano structures, the micro-nano structure is groove, or the micro-nano structure is provided with groove, or the gap between adjacent micro-nano structures forms groove;Nano pigment layer is arranged in the groove, the nano pigment layer includes nano pigment particles, the nano pigment particles are bonded with the surface of the groove by Van der Waals force, form interface adsorption, for presenting color.

[0007] In a feasible implementation mode, the thickness of the hydrophobic graphics layer is 0.5 μm-3 μm, and the material of the hydrophobic graphics layer is a hydrophobic material.

[0008] In a feasible implementation mode, the plurality of micro-nano structures are arranged according to Fresnel, for presenting a three-dimensional relief effect;Or the plurality of micro-nano structures are columnar lenses, for presenting a light and shadow effect.

[0009] In a feasible implementation mode, the width of the groove is 0.5 μm-10 μm, and the inner surface of the groove has roughness, for increasing the physical adsorption site of the nano pigment particles and preventing desorption.

[0010] In a feasible implementation mode, the greater the total area of the groove bottom in unit area, the deeper the color presented after the nano pigment layer is arranged in the groove.

[0011] In a feasible implementation mode, the nano pigment layer is uniformly adsorbed on the inner surface of the groove, and the thickness of the nano pigment layer is 0.5 μm-3 μm;The nano pigment particles have hydrophobicity, and the diameter is 1 nm-100 nm.

[0012] In a feasible implementation mode, the nano pigment layer in the groove of different graphics units in the same hydrophobic graphics layer is different, and different colors are presented.

[0013] In a feasible implementation mode, when there are multiple hydrophobic graphics layers, the nano pigment layer in the groove of the graphics unit in different hydrophobic graphics layers is different, and different hydrophobic graphics layers present different colors.

[0014] In a feasible implementation mode, the refractive index of adjacent hydrophobic graphics layers is different, and the refractive index difference is greater than 0.1.

[0015] In a feasible implementation mode, further comprising a dielectric layer, the dielectric layer covers the hydrophobic graphics layer and the nano pigment layer, the dielectric layer and the hydrophobic graphics layer have different refractive indexes, and the refractive index difference is greater than 0.5.

[0016] A preparation method of a shallow groove type graphic structure, comprising:

[0017] Step S1: providing a substrate layer, coating a glue layer on one side of the substrate layer;

[0018] Step S2: providing a graphic structure template, using the graphic structure template for imprinting, curing to form a hydrophobic graphic layer; providing an aqueous nano pigment mixed solution; filling the aqueous nano pigment mixed solution in graphic units of the hydrophobic graphic layer, and drying; after evaporation of water, nano pigment particles are left and are bonded to the groove surface through Van der Waals force to form a nano pigment layer;

[0019] Step S3: cleaning the side of the hydrophobic graphic layer away from the substrate layer, so that nano pigment particles attached to non-groove areas are cleaned, and drying.

[0020] In a feasible implementation, the step S3 further comprises recycling the cleaned liquid at the same time.

[0021] In a feasible implementation, when the hydrophobic graphic layer includes a plurality of graphic units, and different graphic units display different colors, the step S2 includes using a plurality of graphic structure templates to sequentially imprint in different areas to form a plurality of graphic units; filling different aqueous nano pigment mixed solutions in grooves of different graphic units, and drying; after evaporation of water, different nano pigment layers are formed in different graphic units to present different color effects.

[0022] In a feasible implementation, after the step S3, the method further comprises coating a glue layer on the side of the hydrophobic graphic layer away from the substrate layer, and repeating the steps S2 to S3 to obtain a hydrophobic graphic layer with multiple layers, each layer of the hydrophobic graphic layer filled with a nano pigment layer that presents different colors, and adjacent hydrophobic graphic layers have different refractive indexes, and the refractive index difference is greater than 0.1.

[0023] In a feasible implementation, before coating the glue layer on the side of the hydrophobic graphic layer away from the substrate layer, the method further comprises plating a medium layer, the medium layer covering the hydrophobic graphic layer and the nano pigment layer, the medium layer having a different refractive index from the hydrophobic graphic layer, and the refractive index difference is greater than 0.5.

[0024] A colored three-dimensional image nano-printed product, comprising: a substrate layer, at least one hydrophobic graphic layer, a nano pigment layer, and a microlens array layer;

[0025] The hydrophobic graphic layer is arranged on one side of the substrate layer, and the microlens array layer is arranged on the other side of the substrate layer.

[0026] The hydrophobic graphic layer comprises a plurality of graphic units; each graphic unit comprises a plurality of micro-nano structures, which are grooves; a nano pigment layer is arranged in the grooves, and the nano pigment layer comprises nano pigment particles for presenting colors; the nano pigment particles are bonded to the inner surface of the groove by Van der Waals force to form an interface adsorption.

[0027] The microlens array layer comprises a plurality of microlens units, which correspond to the graphic units one by one to form a stereoscopic display effect.

[0028] In a feasible implementation, the thickness of the hydrophobic graphic layer ranges from 0.5 μm to 3 μm, and the material of the hydrophobic graphic layer is a hydrophobic material.

[0029] In a feasible implementation, the width of the groove ranges from 0.5 μm to 10 μm, and the inner surface of the groove has roughness for increasing the physical adsorption sites of the nano pigment particles and preventing desorption.

[0030] In a feasible implementation, the nano pigment layer is uniformly adsorbed on the surface of the groove, the thickness of the nano pigment layer ranges from 0.5 μm to 3 μm, and the diameter of the nano pigment particles ranges from 1 nm to 100 nm.

[0031] In a feasible implementation, the nano pigment layers in the grooves of different regions in the same hydrophobic graphic layer are different, and present different colors.

[0032] In a feasible implementation, the nano pigment layers in the grooves of different hydrophobic graphic layers are different, and present different colors.

[0033] In a feasible implementation, the refractive indexes of adjacent hydrophobic graphic layers are different, and the refractive index difference is greater than 0.1.

[0034] In a feasible implementation, a medium layer is further included, the medium layer covers the hydrophobic graphic layer and the nano pigment layer, the refractive index of the medium layer is different from that of the hydrophobic graphic layer, and the refractive index difference is greater than 0.5.

[0035] In a feasible implementation, the thickness of the microlens array layer ranges from 1 μm to 20 μm, the aperture of the microlens unit ranges from 10 μm to 200 μm, the focal length ranges from 5 μm to 500 μm, and each graphic unit is within the focal depth range of the microlens unit.

[0036] In a feasible implementation, a coating layer is further arranged on the side of the microlens array layer away from the substrate layer, the coating layer is shaped according to the microlens array layer, and the thickness of the coating layer ranges from 10 nm to 40 nm.

[0037] A preparation method of a colored stereoscopic image nano-printed product, comprising:

[0038] Step S11: design parameters and arrangement of micro-lens units in the micro-lens array layer, and design images of graphic units in the hydrophobic graphic layer, so that the micro-lens units and the graphic units correspond one by one, and meet the requirement of presenting a stereoscopic image, to obtain a micro-lens template and a graphic layer structure template;

[0039] Step S21: provide a substrate layer, coat a glue layer on one side of the substrate layer, and obtain a micro-lens array layer after using the micro-lens template for pressing and curing; coat a glue layer on the other side of the substrate layer;

[0040] Step S31: obtain a hydrophobic graphic layer after using the graphic layer structure template for pressing and curing, fill the aqueous nano-pigment mixture in the structure groove on one side of the hydrophobic graphic layer, and dry; the nano-pigment particles left after evaporation of water are bonded to the surface of the groove through Van der Waals force, to form a nano-pigment layer;

[0041] Step S41: clean the side of the hydrophobic graphic layer away from the substrate layer, so that the nano-pigment particles attached to the non-groove area are cleaned, and dried.

[0042] In a feasible implementation, the step S11 further comprises, when there are multiple hydrophobic graphic layers, cutting the stereoscopic image according to the number of hydrophobic graphic layers, each part corresponding to one layer of hydrophobic graphic layer, to obtain a plurality of corresponding graphic layer structure templates.

[0043] In a feasible implementation, further comprising coating a glue layer on the side of the hydrophobic graphic layer away from the substrate layer, and repeating steps S31-S41 to form multiple hydrophobic graphic layers, and setting different nano-pigment layers on each of the hydrophobic graphic layers to present different color effects.

[0044] In a feasible implementation, before coating the glue layer on the side of the hydrophobic graphic layer away from the substrate layer, further comprising plating a medium layer, the medium layer covering the hydrophobic graphic layer and the nano-pigment layer, the medium layer having a different refractive index from the hydrophobic graphic layer, and the difference in refractive index being greater than 0.5.

[0045] In a feasible implementation, the step S31 further comprises using different graphic structure templates to press in different areas, filling different aqueous nano-particle pigments in the grooves in different graphics, and drying to present different color effects in different areas.

[0046] In a feasible implementation, the step S41 further comprises recycling the cleaned liquid at the same time.

[0047] The beneficial effects of the present application include:

[0048] 1. The shallow groove type graphic structure provided by the present application, wherein the micro-nano structure of the graphic unit is a groove, or a groove is arranged on the micro-nano structure, or a groove is formed between adjacent micro-nano structures, and the nano pigment particles are bonded to the surface of the groove through van der Waals force to form interface adsorption, thereby presenting color. Since it is interface adsorption, the groove does not need to be filled, reducing the use of materials, and the interface adsorption is more firm, so that a shallow groove type groove can be made, and the thickness of the hydrophobic graphic layer is small, being 0.5-3 microns. Nano color particles are used instead of ink, avoiding the use of organic solvents, reducing the risk of environmental pollution, meeting the requirements of sustainable development, and the dissolution process is simple and easy to control, without the need for complex equipment, with strong adaptability, facilitating application in different production environments, and also saving energy and material costs, improving the utilization rate of materials through an efficient dissolution process, and reducing overall production costs.

[0049] 2. The shallow groove type graphic structure provided by the present application can achieve various color effects by arranging multiple hydrophobic graphic layers, and can also display superimposed color effects in the projection overlap area of the micro-nano structure.

[0050] 3. The nano-printed product with colored stereoscopic images provided by the present application, wherein the micro-nano structure of the graphic unit is a groove, and the nano pigment particles are bonded to the surface of the groove through van der Waals force to form interface adsorption, thereby presenting color. Since it is interface adsorption, the groove does not need to be filled, reducing the use of materials, and the interface adsorption is more firm. Nano color particles are used instead of ink, avoiding the use of organic solvents, reducing the risk of environmental pollution, meeting the requirements of sustainable development, and the dissolution process is simple and easy to control, without the need for complex equipment, with strong adaptability, facilitating application in different production environments, and also saving energy and material costs, improving the utilization rate of materials through an efficient dissolution process, and reducing overall production costs.

[0051] 4. The nano-printed product with colored stereoscopic images provided by the present application, wherein the thickness of the hydrophobic graphic layer is small, so that the graphic units on the multiple hydrophobic graphic layers are all within the focal depth range of the microlens unit, each hydrophobic graphic layer presents a different color, thereby realizing a multi-color stereoscopic image.

[0052] 5. The nano-printed product with colored stereoscopic images provided by the present application, wherein a coating layer is arranged on the side of the microlens array layer away from the substrate layer, so as to realize a reflective type printed product, thereby enabling printing on one side of the hydrophobic graphic layer, solving the problem that a transmissive type printed product cannot be printed.

[0053] 6、The preparation method of a shallow groove type graphic structure and the preparation method of a colored three-dimensional image nano-printing product provided by the application, through the micro-nano structure groove to form a capillary channel, the mixed solution obtained after the mixing of the nano pigment particles and water, due to the capillary effect, the nano pigment particles flow and migrate to the groove surface with the mixed solution. When drying, the water evaporates outward from the groove, forming a capillary flow from the inside to the outside, continuously transporting the nano pigment particles into the groove, realizing dynamic replenishment and uniform coverage, at the same time, the nano pigment particles are limited in the groove, so that the liquid evaporation rate is homogenized in three-dimensional space, forming uniform deposition, and the geometric constraint of the groove breaks the coffee ring effect caused by traditional evaporation.

[0054] 7、The preparation method of a shallow groove type graphic structure and the preparation method of a colored three-dimensional image nano-printing product provided by the application, in the cleaning process, the nano pigment particles deposited in the non-groove area are cleaned out, at the same time, the cleaned liquid is recycled, which avoids the waste of nano pigment particles. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 A schematic diagram of a shallow groove type graphic structure provided by the first embodiment of the application;

[0056] Figure 2 A schematic diagram of a shallow groove type graphic structure provided by the first embodiment of the application;

[0057] Figure 3 A schematic diagram of a shallow groove type graphic structure provided by the first embodiment of the application;

[0058] Figure 4 A schematic diagram of a shallow groove type graphic structure provided by the first embodiment of the application;

[0059] Figure 5 A schematic diagram of a shallow groove type graphic structure provided by the first embodiment of the application;

[0060] Figure 6a 、 Figure 6b A schematic diagram of a shallow groove type graphic structure provided by the first embodiment of the application;

[0061] Figure 7 A flow chart of the preparation method of a shallow groove type graphic structure provided by the second embodiment of the application;

[0062] Figure 8 A schematic diagram of the preparation method of a shallow groove type graphic structure provided by the second embodiment of the application;

[0063] Figure 9 A schematic diagram of the preparation method of a shallow groove type graphic structure provided by the third embodiment of the application;

[0064] Figure 10 This is a schematic diagram of a method for preparing a shallow groove-type graphic structure according to Embodiment 4 of the present invention;

[0065] Figure 11 This is a schematic diagram of the structure of a colored three-dimensional image nanoprinted product provided in Embodiment 5 of the present invention;

[0066] Figure 12 This is a schematic diagram of the structure of a colored three-dimensional image nanoprinted product provided in Embodiment 5 of the present invention;

[0067] Figure 13 This is a schematic diagram of the structure of a colored three-dimensional image nanoprinted product provided in Embodiment 5 of the present invention;

[0068] Figure 14 This is a schematic diagram of a colored three-dimensional image nanoprinted product provided in Embodiment Six of the present invention;

[0069] Figure 15 This is a schematic diagram of a colored three-dimensional image nanoprinted product provided in Embodiment 7 of the present invention;

[0070] Figure 16 This is a schematic diagram of the imaging on the hydrophobic image layer of a colored three-dimensional image nanoprinted product provided in Embodiment 7 of the present invention.

[0071] Figure 17 This is a flowchart of a method for preparing a colored three-dimensional image nanoprinted product according to Embodiment 8 of the present invention. Detailed Implementation

[0072] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0073] Example 1, as Figures 1-4 As shown, this embodiment provides a shallow groove-type graphic structure, including a substrate layer 1, a hydrophobic graphic layer 2, and a nano-pigment layer 3. The hydrophobic graphic layer 2 is disposed on one side of the substrate layer 1. The hydrophobic graphic layer 2 includes at least one graphic unit 21, and the graphic unit includes a plurality of micro-nano structures 211. The micro-nano structures 211 are grooves 212, or grooves 212 are provided on the micro-nano structures 211, or grooves 212 are formed between adjacent micro-nano structures 211. The nano-pigment layer 3 is disposed in the groove 212. The nano-pigment layer 3 includes nano-pigment particles. The nano-pigment particles are bonded to the surface of the groove 212 by van der Waals forces to form an interface adsorption, which is used to present color.

[0074] In this embodiment, the thickness of the hydrophobic graphic layer 2 is in the range of 0.5-3 μm, and the thickness is 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, for example. The material of the hydrophobic graphic layer is a hydrophobic material, such as resin and the like. The hydrophobic graphic layer 2 comprises at least one graphic unit 21, and the graphic unit 21 comprises a plurality of micro-nano structures 211. The micro-nano structures 211 can be arranged according to the Fresnel law to present a three-dimensional relief structure. The micro-nano structures 211 can also be columnar lenses to present a light and shadow effect. The micro-nano structures 211 can be concave structures or convex structures. Figure 1 As shown in FIG. 2, the micro-nano structure 211 is a concave structure with a triangular cross section, and a groove 212 is arranged on the micro-nano structure 211. Figure 2 As shown in FIG. 3, the micro-nano structure 211 is a concave structure with a concave arc-shaped cross section. Since the arc-shaped structure is small, it can be used as the groove 212. Figure 3 As shown in FIG. 4, the micro-nano structure 211 is a convex structure with a convex arc-shaped cross section. The gap between adjacent micro-nano structures 211 forms a groove 212. The cross-sectional shape of the micro-nano structure can be triangular, arc-shaped, rectangular, etc. When the micro-nano structure is large, a groove needs to be arranged on the micro-nano structure. When the micro-nano structure itself is a small concave structure, it becomes a groove, and thus no groove needs to be arranged.

[0075] In this embodiment, the width of the groove 212 is narrow, and the width of the groove ranges from 0.5 μm to 10 μm. For example, the width of the groove is 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. The groove forms a capillary channel. After the mixture of the nano-pigment particles and water is obtained, the nano-pigment particles migrate to the surface of the groove along with the flow of the mixture due to the capillary effect. During drying, the water evaporates from the groove 212 to the outside, forming a capillary flow from the inside to the outside, continuously transporting the nano-pigment particles into the groove 212, achieving dynamic replenishment and uniform coverage, while the nano-pigment particles are confined in the groove 212, making the liquid evaporation rate uniform in three-dimensional space, forming uniform deposition, and the geometric constraint of the groove 212 breaks the coffee ring effect caused by traditional evaporation. The hydrophobic graphic layer 2 is made of a hydrophobic material, such as resin, etc., which has hydrophobicity. The nano-pigment particles also have hydrophobicity and are adsorbed on the surface of the groove through interaction. The hydrophobic effect reduces the interfacial energy and enhances the adsorption stability. The surface of the groove 212 has roughness and nano-level concave-convex, which can mechanically "lock" the nano-pigment particles and provide more physical adsorption sites for the nano-pigment particles, preventing the desorption of the nano-pigment layer 3 during drying. The greater the total area of the bottom of the groove 212 per unit area, the darker the color presented after the nano-pigment layer 3 is set. Therefore, the width and density of the groove can be adjusted to adjust the total area of the bottom of the groove per unit area to change the depth of the presented color. Since the nano-pigment layer 3 is uniformly adsorbed on the surface of the groove 212, the thickness of the nano-pigment layer 3 ranges from 0.5 μm to 3 μm. For example, the thickness is 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, or 3 μm. Therefore, the groove 212 can be a shallow groove, and the hydrophobic graphic layer can be made thinner. The nano-pigment particles have hydrophobicity, and the diameter of the nano-pigment particles ranges from 1 nm to 100 nm. The nano-pigment particles include carbon nano-particles, silver nano-particles, copper nano-particles, metal nano-particles, colored nano-pigment particles, etc., without being limited thereto.

[0076] In this embodiment, as Figure 4As shown, the hydrophobic graphic layer 2 comprises two graphic units 21 and 21', the micro-nano structures of the two graphic units are different, the micro-nano structure 211 in the graphic unit 21 is triangular in profile, and a groove 212 is arranged on the micro-nano structure, while the micro-nano structure 211' in the graphic unit 21' is a concave arc structure, and the micro-nano structure 211' is the groove 212'. The nano pigment particles in the nano pigment layer 3 in the groove 212 and the nano pigment layer 3' in the groove 212' are different, so that the two graphic units present different colors. In other embodiments, there can be three or more graphic units, and the micro-nano structures of the graphic units can be the same or different. The nano pigment layers in the grooves of different graphic units can be the same or different, without limitation.

[0077] In this embodiment, as shown in Figure 5 , two hydrophobic graphic layers 200 and 200' are arranged on the substrate layer 100, the micro-nano structure 201 on the hydrophobic graphic layer 200 is a concave arc structure, that is, a groove 202, and a nano pigment layer 300 is arranged in the groove 202, the hydrophobic graphic layer 200' is arranged on the side of the hydrophobic graphic layer 200 away from the substrate layer 100, when the hydrophobic graphic layer 200' is arranged, the hydrophobic graphic layer 200' also covers the nano pigment layer 300 in the groove 202, which fills the groove (shown in dark gray in the figure), and a nano pigment layer 300' is arranged in the groove 202' on the hydrophobic graphic layer 200', the nano pigment particles of the nano pigment layer 300 and the nano pigment layer 300' are different, and present different colors, and at the same time, in the area where the micro-nano structures of the two hydrophobic graphic layers overlap, a color is presented which is the superposition of the two colors. In other embodiments, there can be three or more layers. The refractive indexes of the hydrophobic graphic layers of adjacent two layers can be different, and the difference in refractive index is greater than 0.1, for example, the refractive index of one hydrophobic graphic layer is 1.5 UV glue, and the refractive index of the other hydrophobic graphic layer is 1.65 UV glue, the difference between the two is 0.15, in other embodiments, the difference in refractive index can be 0.2, 0.3, 0.5, etc., without limitation. Because the refractive indexes of the two are different, the light and shadow or the stereoscopic relief of the graphic units of different hydrophobic graphic layers are more obvious.

[0078] In this embodiment, as shown in Figures 6a-6b , when there are multiple hydrophobic graphic layers 200 and 200', a medium layer is also arranged, as shown in Figure 6a , the medium layer 400 covers the hydrophobic graphic layer 200 and the nano pigment layer 300, and the medium layer 400' covers the hydrophobic graphic layer 200' and the nano pigment layer 300'. As shown in Figure 6bAs shown, the medium layer 400 covers the hydrophobic graphic layer 200 and the nano pigment layer 300, and the medium layer can not be provided on the hydrophobic graphic layer and the nano pigment layer farthest from the substrate layer. The medium layer is contoured with the hydrophobic graphic layer and the nano pigment layer. The refractive index of the medium layer is different from that of the hydrophobic graphic layer, and the difference in refractive index is greater than 0.5. Exemplarily, the material of the medium layer is ZnS, and its refractive index is 2.38. The hydrophobic graphic layer is a UV glue layer with a refractive index of 1.5, and the difference in refractive index between the two is 0.88. In other embodiments, the difference in refractive index is 0.6, 0.7, 0.8, 0.9, 1, etc. without being limited thereto. The brightness can be further improved by increasing the medium layer.

[0079] The beneficial effects of the present embodiment include:

[0080] 1. The micro-nano structure of the graphic unit is a groove, or the micro-nano structure is provided with a groove, or the gap between adjacent micro-nano structures forms a groove. The nano pigment particles are bonded to the surface of the groove by van der Waals force, forming interfacial adsorption, thereby presenting color. Since it is interfacial adsorption, the groove does not need to be filled, reducing the use of materials. At the same time, the interfacial adsorption is more firm, so a shallow groove type groove can be made, and the thickness of the hydrophobic graphic layer is smaller, i.e. 0.5-3 μm. The use of nano color particles instead of ink avoids the use of organic solvents, reduces the risk of environmental pollution, meets the requirements of sustainable development, and the dissolution process is simple and easy to control, without the need for complex equipment, with strong adaptability, easy to apply in different production environments, and can save energy and material costs. Through the efficient dissolution process, the utilization rate of materials is improved, and the overall production cost is reduced.

[0081] 2. By providing multiple hydrophobic graphic layers, multiple color effects can be achieved. In the projection overlap area of the micro-nano structure, the superimposed color effect can also be displayed.

[0082] Embodiment two, Figures 7-8 A preparation method of a shallow groove type graphic structure is provided. The specific steps are as follows:

[0083] Step S1: providing a substrate layer, and coating a glue layer on one side of the substrate layer.

[0084] Exemplarily, as shown in Figure 8 As shown in a, a substrate layer 10 is provided, and a glue layer 20 is coated thereon. The material of the glue layer is, for example, a hydrophobic material such as UV glue.

[0085] Step S2: providing a graphic structure template, using the graphic structure template to imprint and solidify to form a hydrophobic graphic layer; providing a water-based nano pigment mixed solution; filling the water-based nano pigment mixed solution in the graphic unit of the hydrophobic graphic layer, and drying; after the water evaporates, the nano pigment particles left are bonded to the surface of the groove by van der Waals force to form a nano pigment layer.

[0086] For example, such as Figure 8 As shown in b, a graphic structure template is used to imprint and cure on the adhesive layer 20 to form a hydrophobic graphic layer 30. The area where the graphic structure is located is a graphic unit 31. There are multiple micro-nano structures 311 in the graphic unit 31. The micro-nano structure 311 is a recessed structure, which itself forms a groove 312. In other embodiments, grooves can also be set on the microstructure, or the gap between adjacent microstructures can form a groove. Figure 8 As shown in Figure c, an aqueous nano-pigment mixture 40, consisting of nano-pigment particles and water, is used to fill the graphic unit 31. The groove 312 forms a capillary channel, allowing the nano-pigment particles to migrate to the groove 312 along with the flow of the aqueous nano-pigment mixture 40. Figure 8 As shown in d, during the drying process, moisture evaporates from the groove 312 outwards, forming a capillary flow from the inside out, continuously transporting the nano-pigment particles into the groove 312 to achieve dynamic replenishment and uniform coverage. At the same time, the nano-pigment particles are confined within the groove 312, which makes the liquid evaporation rate uniform in three-dimensional space, forming a uniform deposition.

[0087] Step S3: Clean the side of the hydrophobic pattern layer away from the substrate layer to clean the nano-pigment particles attached to the non-groove structure area, and then dry it.

[0088] For example, after step S2 is completed, nano-pigment particles are also deposited in the non-groove areas of the graphic unit, therefore cleaning is required. Figure 8 As shown in Figure e, the nano-pigment particles on the surface of the non-grooved area are cleaned. Finally, as shown in Figure e... Figure 8 As shown in f, the material is then dried to obtain a nano-pigment layer 50. The nano-pigment particles in the nano-pigment layer 50 are bonded to the surface of the groove through van der Waals forces.

[0089] During cleaning, the nano-pigment particles deposited in the non-groove areas are washed out, and the cleaning liquid is recovered and recycled, thus avoiding the waste of nano-pigment particles.

[0090] The beneficial effects of this embodiment are as follows:

[0091] 1. Capillary channels are formed through grooves in a micro / nano structure. After mixing nano-pigment particles with water, the resulting mixture is transported to the surface of the grooves by capillary action. During drying, water evaporates from the grooves outward, forming a capillary flow from the inside out, continuously transporting the nano-pigment particles into the grooves, achieving dynamic replenishment and uniform coverage. At the same time, the nano-pigment particles are confined within the grooves, making the liquid evaporation rate uniform in three-dimensional space, forming a uniform deposition. The geometric constraint of the grooves breaks the coffee ring effect caused by traditional evaporation.

[0092] 2. During cleaning, the nano-pigment particles deposited in the non-groove areas are washed out, and the cleaning liquid is recovered and recycled, thus avoiding the waste of nano-pigment particles.

[0093] Example 3, Figure 9 Another method for preparing a shallow trench-type graphic structure provided by the present invention, when there are multiple graphic units in the same hydrophobic graphic layer and different graphic units display different colors, includes the following specific steps:

[0094] like Figure 9 As shown in Figure a, a substrate layer 10 is provided, on which an adhesive layer 20 is coated. The adhesive layer is made of a hydrophobic material, such as UV adhesive. Figure 9 As shown in b, a graphic structure template is used to imprint and cure on the adhesive layer 20 to obtain a graphic unit 31. The graphic unit 31 contains multiple micro / nano structures 311, which are recessed structures that themselves form grooves 312. Another graphic structure template is then used for imprinting and curing to obtain a graphic unit 32, which contains multiple micro / nano structures 321, which are recessed structures that themselves form grooves 322. In other embodiments, grooves can also be formed on the microstructures, or the gaps between adjacent microstructures can form grooves. Multiple graphic structure templates can also be used for imprinting. After all graphic structure templates are imprinted, a hydrophobic graphic layer 30 is obtained. Figure 9 As shown in Figure c, an aqueous nano-pigment mixture 40 (e.g., a mixture for representing red) is used to fill the area of ​​the graphic unit 31. Grooves 312 form capillary channels, and nano-pigment particles migrate to grooves 312 along with the flow of the aqueous nano-pigment mixture 40. Another different aqueous nano-pigment mixture 40' (e.g., a mixture for representing green) is used to fill the area of ​​the graphic unit 32, and nano-pigment particles migrate to grooves 322 along with the flow of the aqueous nano-pigment mixture 40'. Figure 9 As shown in d, during the drying process, moisture evaporates from grooves 312 and 322 outwards, forming a capillary flow from the inside out, continuously distributing and transporting the two types of nano-pigment particles into grooves 312 and 322, achieving dynamic replenishment and uniform coverage. At the same time, the nano-pigment particles are confined within the grooves, making the liquid evaporation rate uniform in three-dimensional space, forming a uniform deposition.

[0095] Nanoparticles are also deposited in the non-groove areas of graphic unit 31 and graphic unit 32, therefore cleaning is required. Figure 9 As shown in Figure e, the nano-pigment particles on the surface of the non-grooved area are cleaned. Finally, as shown in Figure e... Figure 9f, drying is performed again to obtain two nano pigment layers 50 and 50' of different colors, and the nano pigment particles in the nano pigment layers 50 and 50' are bonded to the groove surface by Van der Waals force. Thus, different colors are displayed in different graphic units.

[0096] The beneficial effect of the embodiment is that by filling different aqueous nano pigment mixtures in the grooves of different graphic units in the same layer of the hydrophobic graphic layer, different colors are displayed in different graphic units after drying and cleaning.

[0097] Embodiment Four, Figure 10 Another method for preparing a shallow groove type graphic structure provided by the present application is as follows: when there are multiple layers of hydrophobic graphic layers, different nano pigment layers are filled in the grooves of the microstructures in each layer of the hydrophobic graphic layer.

[0098] As shown in Figure 10 a, a substrate layer 10 is provided, and a glue layer 20 is coated on the substrate layer 10. The material of the glue layer is, for example, a hydrophobic material such as UV glue. As shown in Figure 10 b, a graphic structure template is used to perform imprinting on the glue layer 20, and curing is performed to form a hydrophobic graphic layer 30. The area where the graphic structure is located is a graphic unit 31, and the graphic unit 31 has multiple micro-nano structures 311. The micro-nano structures 311 are recessed structures, and the recessed structures themselves form grooves 312. In other embodiments, grooves can also be provided on the microstructures, or the gap between adjacent microstructures forms a groove. Figure 10 c, an aqueous nano pigment mixture 40 (for example, a mixture for presenting red) is used to fill the graphic unit 31 area. The grooves 312 form capillary channels, and the nano pigment particles flow and migrate to the grooves 312 along with the aqueous nano pigment mixture 40. As shown in Figure 10 d, drying is performed. During drying, water evaporates from the grooves 312 to the outside, forming a capillary flow from the inside to the outside, continuously distributing and transporting the two types of nano pigment particles into the grooves 312, achieving dynamic replenishment and uniform coverage. At the same time, the nano pigment particles are limited in the grooves, so that the liquid evaporation rate is uniformized in three-dimensional space, forming uniform deposition. There is also deposition of nano pigment particles in the non-groove area of the graphic unit 31, so cleaning is required. As shown in Figure 10 e, the nano pigment particles on the surface of the non-groove area are cleaned. As shown in Figure 10 f, drying is performed again to obtain a nano pigment layer 50. The nano pigment particles in the nano pigment layer 50 are bonded to the groove surface by Van der Waals force.

[0099] As shown in Figure 10 g, a glue layer 20' is coated on a layer of the hydrophobic graphic layer 30 away from the substrate layer. As shown in Figure 10h, another graphic structure template is used to imprint on the adhesive layer 20', and the hydrophobic graphic layer 30' is formed by curing. The graphic structure is a graphic unit 32, and the graphic unit 32 has a plurality of micro-nano structures 321, which are recessed structures and form grooves 322 by themselves. In other embodiments, grooves can also be provided on the micro-nano structures, or the gaps between adjacent micro-nano structures form grooves. As shown in Figure 10 i, an aqueous nano-pigment mixture 40' (for example, a mixture for presenting green) is used to fill the graphic unit 32 area. The grooves 322 form capillary channels, and the nano-pigment particles migrate to the grooves 322 along with the aqueous nano-pigment mixture 40'. As shown in Figure 10 j, drying is performed. Nano-pigment particles are also deposited in the non-groove area of the graphic unit 32, so cleaning is needed. As shown in Figure 10 k, the nano-pigment particles on the surface of the non-groove area are cleaned. As shown in Figure 10 l, drying is performed again to obtain a nano-pigment layer 50'. The nano-pigment layer 50 and the nano-pigment layer 50' present different colors.

[0100] The adjacent hydrophobic graphic layers 30 and 30' have different refractive indexes, and the difference in refractive indexes is greater than 0.1, so that the presented three-dimensional relief effect or light and shadow effect is clearer and more obvious.

[0101] In this embodiment, after the step shown in Figure 11-13 f, a medium layer can also be plated, which covers the hydrophobic graphic layer and the nano-pigment layer, and is shaped with the hydrophobic graphic layer and the nano-pigment layer. The medium layer has a different refractive index from the hydrophobic graphic layer, and the difference in refractive indexes is greater than 0.5. An adhesive layer is coated on the medium layer, and the preparation of the shallow groove type graphic structure is completed by steps 10g to 10l.

[0102] In other embodiments, there can be more layers of hydrophobic graphic layers, and different nano-pigment layers are provided in the grooves of each layer of hydrophobic graphic layers to present different color effects.

[0103] The beneficial effect of this embodiment is that different aqueous nano-pigment mixtures are filled in the grooves of the graphic units of different hydrophobic graphic layers, and after drying and cleaning, different colors are presented by different hydrophobic graphic layers. If the micro-nano structures have overlapping areas in different layers, the superimposed color effect is displayed.

[0104] Embodiment five, Figure 11 As shown in the figure, the present embodiment provides a colored three-dimensional image nano-printed product. As shown in Figure 11 As shown in the figure, it is a transmission type colored three-dimensional image nano-printed product, which comprises a substrate layer 1, at least one hydrophobic graphic layer 2, a nano-pigment layer 3, and a microlens array layer 4.

[0105] The hydrophobic graphic layer 2 is disposed on one side of the substrate layer 1, and the microlens array layer 4 is disposed on the other side of the substrate layer 1. The hydrophobic graphic layer 2 comprises a plurality of graphic units 21, Figure 12 The right side is an enlarged view of the graphic unit 21, which comprises a plurality of micro-nano structures 211, which are grooves; a nano pigment layer 3 is disposed in the groove, which comprises nano pigment particles for presenting color; the nano pigment particles are bonded to the inner surface of the groove by Van der Waals force to form interfacial adsorption. The microlens array layer 4 comprises a plurality of microlens units 41, which correspond to the graphic units 21 one by one to form a stereoscopic display effect.

[0106] In this embodiment, the thickness of the hydrophobic graphic layer 2 ranges from 0.5 μm to 3 μm, and the thickness is 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, and 3 μm, for example. The material of the hydrophobic graphic layer is a hydrophobic material, such as resin and the like.

[0107] In this embodiment, the width of the micro-nano structure 211, i.e. the groove, is relatively narrow, and the width of the groove ranges from 0.5 μm to 10 μm. For example, the width of the groove is 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. The groove forms a capillary channel. After the mixture of the nano-pigment particles and water is obtained, the nano-pigment particles migrate to the surface of the groove due to the capillary effect. During the drying process, the water evaporates from the groove 211 to the outside, forming a capillary flow from the inside to the outside, continuously transporting the nano-pigment particles into the groove 211, achieving dynamic replenishment and uniform coverage. At the same time, the nano-pigment particles are confined in the groove 211, making the evaporation rate of the liquid uniform in three-dimensional space, forming uniform deposition, and breaking the coffee ring effect caused by traditional evaporation. The hydrophobic graphic layer 2 is made of a hydrophobic material, such as resin, etc. The nano-pigment particles also have hydrophobicity, and are adsorbed on the surface of the groove through interaction. The hydrophobic effect reduces the interfacial energy and enhances the adsorption stability. The surface of the groove 211 has roughness and nano-level concave-convex structures, which can mechanically "lock" the nano-pigment particles, providing more physical adsorption sites for the nano-pigment particles and preventing the desorption of the nano-pigment layer 3 during the drying process. Since the nano-pigment layer 3 is uniformly adsorbed on the surface of the groove 211, the thickness of the nano-pigment layer 3 ranges from 0.5 μm to 3 μm. For example, the thickness is 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, or 3 μm. Therefore, the groove 211 can be a relatively shallow groove, and the hydrophobic graphic layer 2 can be made thinner. The nano-pigment particles have hydrophobicity, and the diameter of the nano-pigment particles ranges from 1 nm to 100 nm. The nano-pigment particles include carbon nano-particles, silver nano-particles, copper nano-particles, metal nano-particles, colored nano-pigment particles, etc. The same hydrophobic graphic layer 2 has a region A and a region B. The nano-pigment layer in the groove in the region A is different from the nano-pigment layer in the groove in the region B, thereby presenting different colors. In other embodiments, there can be more regions, and the nano-pigment layers in the grooves of different regions are different.

[0108] In this embodiment, on the same side of the substrate layer 1, a plurality of hydrophobic graphic layers can also be provided, as shown in FIG. 2B. The hydrophobic graphic layers 2, 2', and 2" are transmission type nano-printed products, and the nano-pigment layers in the grooves of the hydrophobic graphic layers 2, 2', and 2" are different, thereby presenting different colors. Figure 12 The groove of the hydrophobic graphic layer 2 is provided with a nano-pigment layer 3, and there is a cavity on the nano-pigment layer 3. When the adhesive layer of the hydrophobic graphic layer 2' is coated on the hydrophobic graphic layer 2, the cavity is filled. Therefore, if the refractive indexes of the adjacent two hydrophobic graphic layers are the same, the micro-nano structure is filled, as shown in FIG. 2C. Figure 13The enlarged view on the right side shows that the optical effect is obviously weakened. To this end, there are two methods to enhance the optical effect when there are multiple layers of hydrophobic graphic layers. One is that the refractive indexes of adjacent hydrophobic graphic layers are different, and the difference in refractive index is greater than 0.1, that is, the materials of the hydrophobic graphic layer 2 and the hydrophobic graphic layer 2' are different, for example, two UV glues with different refractive indexes are used. For example, the refractive index of one layer of hydrophobic graphic layer is 1.5, and the refractive index of the other side of the hydrophobic graphic layer is 1.65, and the difference between the two is 0.15. In other embodiments, the difference in refractive index can be 0.2, 0.3, 0.5, and the like. Another is to further provide a medium layer on the side of the hydrophobic graphic layer 2 away from the substrate layer 1, and the medium layer covers the hydrophobic graphic layer and the nano pigment layer, for example, the medium layer is shaped. The refractive index of the medium layer and the hydrophobic graphic layer is different, and the difference in refractive index is greater than 0.5. For example, the material of the medium layer is ZnS, and the refractive index is 2.38. The refractive index of the hydrophobic graphic layer is 1.5, and the difference between the two is 0.88. In other embodiments, the difference in refractive index is 0.6, 0.7, 0.8, 0.9, 1, and the like. By increasing the medium layer, the brightness can be further improved.

[0109] In this embodiment, the thickness of the microlens array layer is 1 μm-20 μm, the aperture of the microlens unit is 10 μm-200 μm, and the focal length is 5 μm-500 μm. Each hydrophobic graphic layer is within the focal depth range of the microlens unit.

[0110] In this embodiment, as shown in Figure 14 , it is a reflective type of colored stereoscopic image nano printing product. The plating layer 5 is shaped with the microlens array layer 4 and is provided on the side of the microlens array layer 4 away from the substrate layer 1. The thickness of the plating layer 5 is 10 nm-40 nm. For example, the thickness of the plating layer 5 is 10 nm, 20 nm, 30 nm, or 40 nm. The material of the plating layer is aluminum or chromium, or other materials with reflective function, to achieve the reflective effect. By providing the plating layer, a reflective type of nano printing product is formed. The reflective type of nano printing product can be printed on one side of the hydrophobic graphic layer, solving the problem that the transmissive type of printing product cannot be printed.

[0111] For example, a transmissive type of colored stereoscopic image nano printing product, the thickness of the substrate layer is 23 μm, the thickness of the microlens array layer is 7 μm, the aperture of the microlens unit is 25 μm, and the focal length is 30 μm. The thickness of the hydrophobic graphic layer is 2 μm.

[0112] For example, a reflective type of colored stereoscopic image nano printing product, the thickness of the substrate layer is 50 μm, the thickness of the microlens array layer is 11 μm, the aperture of the microlens unit is 104 μm, and the focal length is 67 μm. The thickness of the hydrophobic graphic layer is 2 μm.

[0113] The beneficial effects of the present embodiment are:

[0114] 1. The micro-nano structure of the graphic unit is a groove, and the nano pigment particles are bonded to the surface of the groove through van der Waals force to form interfacial adsorption, thereby presenting color. Since it is interfacial adsorption, the groove does not need to be filled, reducing the use of materials, and the interfacial adsorption is more firm, so a shallow groove type groove can be made, and the thickness of the hydrophobic graphic layer is smaller, 0.5-3μm. And using nano color particles instead of ink avoids the use of organic solvents, reduces the risk of environmental pollution, meets the requirements of sustainable development, and the dissolution process is simple and easy to control, without the need for complex equipment, strong adaptability, easy to apply in different production environments, can also save energy and material costs, improve the utilization rate of materials through efficient dissolution process, and reduce the overall production cost.

[0115] 2. Due to the small thickness of the hydrophobic graphic layer, the graphic units on the multi-layer hydrophobic graphic layer are within the focal depth range of the microlens unit, each layer of the hydrophobic graphic layer presents a different color, thereby realizing a multi-color stereoscopic image.

[0116] 3. By providing a coating layer on the side of the microlens array layer away from the base material layer, a reflective type of printed product can be achieved, thereby enabling printing on one side of the hydrophobic graphic layer, solving the problem of the inability to print on a transmissive type of printed product.

[0117] Embodiment six, Figures 15-16For example, a three-dimensional colored butterfly, the outermost area of the butterfly wing forms a three-dimensional image C1 in red, the inner area of the butterfly wing forms a three-dimensional image C3 in yellow, the spots on the butterfly wing form a three-dimensional image C2 in blue, and the entire outline of the butterfly forms a three-dimensional image C4 in black. The three-dimensional colored butterfly needs to be divided into four different three-dimensional images (C1, C2, C3, C4) according to different colors. Each three-dimensional image forms a plurality of graphic units on the corresponding hydrophobic graphic layer after passing through the microlens array 4. The red three-dimensional image C1 forms a plurality of graphic units on the hydrophobic graphic layer 2, and the micro-nano structure groove of the graphic unit adsorbs red nano pigment particles. The yellow three-dimensional image C3 forms a plurality of graphic units on the hydrophobic graphic layer 2', and the micro-nano structure groove of the graphic unit adsorbs yellow nano pigment particles. The blue three-dimensional image C2 forms a plurality of graphic units on the hydrophobic graphic layer 2'', and the micro-nano structure groove of the graphic unit adsorbs blue nano pigment particles. The black three-dimensional image C4 forms a plurality of graphic units on the hydrophobic graphic layer 2''', and the micro-nano structure groove of the graphic unit adsorbs black nano pigment particles. The graphic units of all hydrophobic graphic layers are within the focal depth range of the microlens unit. In other embodiments, the colored three-dimensional image can also be separated into red, green, and blue channels. The micro-nano structure groove of the three-layer hydrophobic graphic layer adsorbs red, green, and blue nano pigment particles, thereby realizing color. When the microlens unit parameters are determined, the final imaging resolution is also determined, and the pixel resolution in a single microlens unit is also determined. When there is only one layer of hydrophobic graphic layer, at least R, G, and B channels are needed to express the true color image, so one dimension of resolution is sacrificed. When three layers of hydrophobic graphic layers corresponding to R, G, and B channels are used, the resolution is not lost, and the accuracy is improved.

[0118] Embodiment seven, Figure 16 As shown in the figure, in this embodiment, the quadrangular pyramid is cut into four parts in the height direction, which are M1, M2, M3, and M4. After passing through the microlens array layer, the M1 part is imaged on the hydrophobic graphic layer 2, and the imaged image is as shown in Figure 16 a; the M2 part is imaged on the hydrophobic graphic layer 2', and the imaged image is as shown in Figure 16 b; the M3 part is imaged on the hydrophobic graphic layer 2'', and the imaged image is as shown in Figure 16 c; and the M4 part is imaged on the hydrophobic graphic layer 2''', and the imaged image is as shown in Figure 17 d. The colors of the nano pigment layers in the grooves in different hydrophobic graphic layers are different, thereby presenting a multi-colored three-dimensional image, including metallic colors such as gold and silver, black, gray, white, and color.

[0119] In the embodiment, the capillary phenomenon formed by the groove makes the nano pigment layer uniformly cover the groove surface, thereby greatly reducing the thickness of the hydrophobic graphic layer, ensuring that each hydrophobic graphic layer is within the focal depth range of the lens unit, and the stereoscopic image presented is clearer and the distortion is greatly reduced.

[0120] Embodiment eight, Figure 11 The application provides a preparation method of a colored stereoscopic image nano printing product, and the specific steps are as follows:

[0121] Step S11: parameters and arrangement of the microlens units in the microlens array layer are designed, and the images of the graphic units in the hydrophobic graphic layer are designed, so that the microlens units and the graphic units correspond to each other and meet the requirement of presenting a stereoscopic image, thereby obtaining a microlens template and a graphic layer structure template;

[0122] Specifically, the parameters of the microlens units include the aperture and focal length of the microlens units, and the arrangement mode of the microlens units includes array arrangement and the like.

[0123] Step S21: a substrate layer is provided, a glue layer is coated on one side of the substrate layer, a microlens array layer is obtained after the microlens template is used for pressing and curing; and a glue layer is coated on the other side of the substrate layer.

[0124] Step S31: a hydrophobic graphic layer is obtained after the graphic layer structure template is used for pressing and curing, the hydrophobic graphic layer is filled with the water-based nano pigment mixed solution in the groove on one side of the hydrophobic graphic layer, and drying is performed, so that the nano pigment particles left after evaporation of water are bonded to the groove surface through van der Waals force, thereby forming a nano pigment layer.

[0125] Specifically, there can be only one hydrophobic graphic layer, and only one kind of water-based nano pigment is filled in the groove of the hydrophobic graphic layer, or different graphic structure templates are used for pressing in different regions in one hydrophobic graphic layer, such as Figure 14 As shown in the figure, two regions A and B are included, the corresponding graphic structure template is used for pressing in the region A, the corresponding another graphic structure template is used for pressing in the region B, different water-based nano particles are filled in the grooves in different regions, and drying is performed, so that different color effects are presented in different regions.

[0126] Step S41: the side of the hydrophobic graphic layer away from the substrate layer is cleaned, so that the nano pigment particles attached to the non-groove region are cleaned, and drying is performed;

[0127] Specifically, after step S31 is completed, the nano pigment particles are deposited in the non-groove region of the graphic unit, and therefore cleaning is needed. When cleaning, the nano pigment particles deposited in the non-groove region are cleaned out, and the liquid after cleaning can be recycled, thereby avoiding waste of the nano pigment particles.

[0128] Specifically, in some embodiments, different color corresponding stereoscopic images are extracted according to the color of the stereoscopic image, and are corresponded to different hydrophobic graphic text layers. For example, Figure 15 For example, a stereoscopic color butterfly can be divided into different stereoscopic images C1, C2, C3 and C4 according to different colors. In other embodiments, three separate color stereoscopic images of red, blue and green can also be extracted from the stereoscopic color image.

[0129] Specifically, in some embodiments, the stereoscopic image is cut according to the number of hydrophobic graphic text layers, each part corresponds to a layer of hydrophobic graphic text layer, and a corresponding plurality of graphic text layer structure templates are prepared. For example, Figure 16 As shown, when there are four layers of hydrophobic graphic text layers, the four prisms are cut to obtain M1, M2, M3 and M4. The imaging image after the microlens unit of M1 is as shown in FIG. Figure 16 a, according to the figure, a graphic text layer structure template K1 is prepared. The imaging image after the microlens unit of M2 is as shown in FIG. Figure 16 b, according to the figure, a graphic text layer structure template K2 is prepared. The imaging image after the microlens unit of M3 is as shown in FIG. Figure 16 c, according to the figure, a graphic text layer structure template K3 is prepared. The imaging image after the microlens unit of M4 is as shown in FIG. ​ d, according to the figure, a graphic text layer structure template K4 is prepared.

[0130] The top M1 of the four prisms is closest to the base material layer 1, and the bottom M4 is farthest from the base material layer 1, so the hydrophobic graphic text layer 2 is obtained by using the graphic text layer structure template K1 for imprinting and curing first, filling the water-based nanometer pigment mixed solution in the structure groove on the side of the hydrophobic graphic text layer, and drying. After the evaporation of water, the nanometer pigment particles are bonded to the surface of the groove through Van der Waals force to form a nanometer pigment layer; the side of the hydrophobic graphic text layer away from the base material layer is cleaned, so that the nanometer pigment particles attached to the non-groove area are cleaned, and dried.

[0131] The adhesive layer is coated on the side of the hydrophobic graphic text layer 2 away from the base material layer 1, and the above-mentioned imprinting and curing are repeated using the graphic text layer structure template K2 to obtain the hydrophobic graphic text layer 2', which is filled, dried, cleaned, and dried again. Repeat until all four templates are completed, each of the hydrophobic graphic text layers has a different nanometer pigment layer, and different color effects are presented to obtain a nanometer printing product of a multi-color stereoscopic image. The refractive indices of adjacent hydrophobic graphic text layers are different, and the difference is greater than 0.1. In other embodiments, there can be 2, 3 or more hydrophobic graphic text layers.

[0132] In the embodiment, a medium layer is further coated on the side of the hydrophobic graphic layer away from the base layer before the adhesive layer is coated, the medium layer covers the hydrophobic graphic layer and the nano pigment layer, the medium layer has a different refractive index from the hydrophobic graphic layer, and the difference in refractive index is greater than 0.5.

[0133] The beneficial effects of the embodiment are:

[0134] 1. The capillary channel is formed by the groove of the micro-nano structure, and the mixed solution obtained after the mixing of the nano pigment particles and water flows to the surface of the groove due to the capillary effect. When drying, water evaporates from the groove to the outside, forming a capillary flow from the inside to the outside, continuously transporting the nano pigment particles into the groove, achieving dynamic replenishment and uniform coverage, and at the same time, the nano pigment particles are limited in the groove, so that the liquid evaporation rate is uniformized in three-dimensional space, forming uniform deposition, and the geometric constraint of the groove breaks the coffee ring effect caused by traditional evaporation.

[0135] 2. During cleaning, the nano pigment particles deposited in the non-groove area are cleaned out, and at the same time, the cleaned liquid is recycled, avoiding waste of nano pigment particles.

[0136] The same layer name in the above different products or embodiments does not mean that the material, composition, thickness or pattern and other related parameters are necessarily the same, and can be the same or different, and can be selected or made according to actual needs. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the present application.

[0137] In the drawings, the size and relative size of the layers and regions are exaggerated for clarity. It should be understood that when an element such as a layer, region or substrate is referred to as being "formed on", "disposed on" or "located on" another element, the element can be directly disposed on the other element, or there can be an intermediate element. Conversely, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there is no intermediate element.

[0138] In this paper, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of expressing the technical solution clearly and conveniently, and therefore cannot be understood as a limitation on the present application.

[0139] Any technical features in the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations are described, but it is understood that the scope of the present disclosure encompasses all possible combinations.

[0140] In this document, the terms "comprise", "contain", or any other variant thereof are intended to cover a non-exclusive inclusion, such that the process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed.

[0141] The above description is merely illustrative of the application and not restrictive thereof; the scope of the application should be determined solely by the appended claims.

Claims

1. A shallow trench texturing structure, characterized by, It comprises: The substrate layer, at least one hydrophobic graphic layer, and the nano pigment layer; the hydrophobic graphic layer is arranged on one side of the substrate layer, and the hydrophobic graphic layer comprises at least one graphic unit, the graphic unit comprises a plurality of micro-nano structures, the micro-nano structure is a groove, or the micro-nano structure is provided with a groove, or the gap between adjacent micro-nano structures forms a groove; the nano pigment layer is arranged in the groove, the nano pigment layer comprises nano pigment particles, the nano pigment particles are bonded to the surface of the groove by Van der Waals force to form an interface adsorption, and the interface adsorption is used for presenting color; The width of the groove ranges from 0.5 μm to 10 μm, and a capillary channel is formed; The surface of the groove has roughness, and nano-level concave-convex structures exist; The nano pigment particles have hydrophobicity; The preparation method of the shallow groove type graphic structure comprises: Step S1: providing a substrate layer, coating a glue layer on one side of the substrate layer; step S2: providing a graphic structure template, using the graphic structure template to imprint and solidify to form a hydrophobic graphic layer; providing an aqueous nano pigment mixed solution; filling the aqueous nano pigment mixed solution into the graphic unit of the hydrophobic graphic layer, and drying; after the evaporation of water, the nano pigment particles remaining are bonded to the surface of the groove by Van der Waals force to form a nano pigment layer; step S3: cleaning the side of the hydrophobic graphic layer away from the substrate layer, so that the nano pigment particles attached to the non-groove area are cleaned, and drying.

2. The shallow trench texturing structure of claim 1, wherein, The thickness of the hydrophobic graphic layer ranges from 0.5 μm to 3 μm, and the material of the hydrophobic graphic layer is a hydrophobic material.

3. The shallow trench texturing structure of claim 1, wherein, A plurality of the micro-nano structures are arranged according to Fresnel, and are used for presenting a three-dimensional relief effect; or the plurality of the micro-nano structures are columnar lenses, and are used for presenting a light and shadow effect.

4. The shallow trench texturing structure of claim 1, wherein, The inner surface of the groove has roughness, which is used for increasing the physical adsorption sites of the nano pigment particles and preventing desorption.

5. The shallow trench texturing structure of claim 1, wherein, The greater the total area of the groove bottom in a unit area, the deeper the color presented after the nano pigment layer is arranged in the groove.

6. The shallow trench texturing structure of claim 1, wherein, The nano pigment layer is uniformly adsorbed on the inner surface of the groove, the thickness of the nano pigment layer is 0.5 μm to 3 μm, and the diameter of the nano pigment particles is 1 nm to 100 nm.

7. The shallow trench texturing structure of claim 1, wherein, The nano pigment layers in the grooves of different graphic units in the same hydrophobic graphic layer are different, and different colors are presented.

8. The shallow trench texturing structure of claim 1, wherein, When there are multiple hydrophobic graphic layers, the nano pigment layers in the grooves of graphic units in different hydrophobic graphic layers are different, and different hydrophobic graphic layers present different colors.

9. The shallow trench texturing structure of claim 8, wherein, The refractive indexes of adjacent hydrophobic graphic layers are different, and the difference between the refractive indexes is greater than 0.

1.

10. The shallow trench texturing structure of claim 8, wherein, Further comprising a medium layer, the medium layer covers the hydrophobic graphic layer and the nano pigment layer, the refractive index of the medium layer is different from that of the hydrophobic graphic layer, and the difference between the refractive indexes is greater than 0.

5.

11. A method for manufacturing the shallow trench pattern structure according to any one of claims 1 to 10, characterized by, Step S1: providing a substrate layer, coating a glue layer on one side of the substrate layer; Step S2: providing a graphic structure template, using the graphic structure template to imprint and solidify to form a hydrophobic graphic layer; The water-based nano pigment mixture is provided; the water-based nano pigment mixture is filled in the graphic unit of the hydrophobic graphic layer, and is dried; after the water evaporates, the nano pigment particles remain and are bonded to the surface of the groove through Van der Waals force to form a nano pigment layer; step S3: cleaning the side of the hydrophobic graphic layer away from the substrate layer, so that the nano pigment particles attached to the non-groove area are cleaned, and are dried.

12. The method for preparing the shallow groove-type graphic structure as described in claim 11, characterized in that, In the step S3, the cleaned liquid is also recycled at the same time.

13. The method for preparing the shallow groove-type graphic structure as described in claim 11, characterized in that, When the hydrophobic graphic layer includes a plurality of graphic units, and different graphic units display different colors, the step S2 includes using a plurality of graphic structure templates to sequentially imprint different areas to form a plurality of graphic units; different water-based nano pigment mixtures are filled in the grooves of different graphic units, and are dried; after the water evaporates, different nano pigment layers are formed in different graphic units to present different color effects.

14. The method for preparing the shallow groove-type graphic structure as described in claim 11, characterized in that, After the step S3, a glue layer is coated on the side of the hydrophobic graphic layer away from the substrate layer, and the steps S2 to S3 are repeated to obtain a hydrophobic graphic layer with multiple layers, each layer of the hydrophobic graphic layer filled with a nano pigment layer presenting different colors, and the refractive indexes of adjacent hydrophobic graphic layers are different, and the refractive index difference is greater than 0.

1.

15. The method for preparing the shallow groove-type graphic structure as described in claim 14, characterized in that, Before coating the glue layer on the side of the hydrophobic graphic layer away from the substrate layer, a medium layer is plated, the medium layer covers the hydrophobic graphic layer and the nano pigment layer, the refractive index of the medium layer is different from that of the hydrophobic graphic layer, and the refractive index difference is greater than 0.

5.

16. A colored stereoscopic image nano-printed article, characterized in that, Comprise: a substrate layer, at least one hydrophobic graphic layer, a nano pigment layer, and a microlens array layer; the hydrophobic graphic layer is arranged on one side of the substrate layer, and the microlens array layer is arranged on the other side of the substrate layer; the hydrophobic graphic layer includes a plurality of graphic units; the graphic unit includes a plurality of micro-nano structures, the micro-nano structure is a groove; the nano pigment layer is arranged in the groove, the nano pigment layer includes nano pigment particles for presenting color; the nano pigment particles are bonded to the inner surface of the groove through Van der Waals force to form interfacial adsorption; the microlens array layer includes a plurality of microlens units, the microlens unit corresponds to the graphic unit one by one to form a stereoscopic display effect; the width of the groove ranges from 0.5 μm to 10 μm, and a capillary channel is formed; the surface of the groove has roughness and exists nano-level concave-convex; the nano pigment particles have hydrophobicity; Step S11: design the parameters and arrangement of the microlens units in the microlens array layer, design the images of the graphic units in the hydrophobic graphic layer, so that the microlens units and the graphic units correspond one by one, meet the requirement of presenting a stereoscopic image, and prepare a microlens template and a graphic layer structure template; Step S21: provide a substrate layer, coat a glue layer on one side of the substrate layer, use the microlens template to perform imprinting and curing to obtain a microlens array layer; coat a glue layer on the other side of the substrate layer; Step S31: use the graphic layer structure template to perform imprinting and curing to obtain a hydrophobic graphic layer, fill the aqueous nano-pigment mixture in the structure groove on one side of the hydrophobic graphic layer, and dry; after the water evaporates, the nano-pigment particles are bonded to the surface of the groove through Van der Waals force to form a nano-pigment layer; Step S41: clean the side of the hydrophobic graphic layer away from the substrate layer, so that the nano-pigment particles attached to the non-groove area are cleaned, and dried.

17. The nanoimprint article of claim 16, wherein, The thickness of the hydrophobic graphic layer ranges from 0.5 μm to 3 μm, and the material of the hydrophobic graphic layer is a hydrophobic material.

18. The nanoimprint article of claim 16, wherein, The inner surface of the groove has roughness, which increases the physical adsorption sites of the nano-pigment particles and prevents desorption.

19. The nanoimprint article of claim 16, wherein The nano-pigment layer is uniformly adsorbed on the surface of the groove, the thickness of the nano-pigment layer is 0.5 μm to 3 μm, and the diameter of the nano-pigment particles is 1 nm to 100 nm.

20. The nanoimprint article of claim 16, wherein The nano-pigment layers in the grooves of different regions in the same hydrophobic graphic layer are different, presenting different colors.

21. The nanoimprint article of claim 16, wherein, The nano-pigment layers in the grooves of different hydrophobic graphic layers are different, presenting different colors.

22. The nanoimprint article of claim 21, wherein, The refractive indices of adjacent hydrophobic graphic layers are different, and the difference in refractive index is greater than 0.

1.

23. The nanoimprint article of claim 21, wherein, Further comprising a medium layer covering the hydrophobic graphic layer and the nano-pigment layer, the refractive index of the medium layer is different from that of the hydrophobic graphic layer, and the difference in refractive index is greater than 0.

5.

24. The nanoimprint article of claim 16, wherein The thickness of the microlens array layer is 1 μm to 20 μm, the aperture of the microlens unit is 10 μm to 200 μm, the focal length is 5 μm to 500 μm, and each graphic unit is within the focal depth range of the microlens unit.

25. The nanoimprint article of claim 16, wherein The side of the microlens array layer away from the substrate layer is further provided with a coating layer, the coating layer is shaped with the microlens array layer, and the thickness of the coating layer is 10 nm to 40 nm.

26. A method of producing a colored stereoscopic image nanoimprint article according to any one of claims 16-25, characterized in that, Comprise: Step S11: design the parameters and arrangement of the microlens units in the microlens array layer, design the images of the graphic units in the hydrophobic graphic layer, so that the microlens units and the graphic units correspond one by one, meet the requirement of presenting a stereoscopic image, and prepare a microlens template and a graphic layer structure template; Step S21: provide a substrate layer, coat a glue layer on one side of the substrate layer, use the microlens template to perform imprinting and curing to obtain a microlens array layer; coat a glue layer on the other side of the substrate layer; Step S31: use the graphic layer structure template to perform imprinting and curing to obtain a hydrophobic graphic layer, fill the aqueous nano pigment mixture into the structure grooves on one side of the hydrophobic graphic layer, and dry; after the water evaporates, the nano pigment particles left are bonded to the groove surface through Van der Waals force to form a nano pigment layer; Step S41: clean the side of the hydrophobic graphic layer away from the substrate layer, so that the nano pigment particles attached to the non-groove area are cleaned, and dried.

27. The method for preparing nanoprinted articles as described in claim 26, characterized in that, The step S11 further comprises, when there are multiple hydrophobic graphic layers, according to the number of hydrophobic graphic layers, cutting the stereoscopic image, each part corresponding to a layer of hydrophobic graphic layer, and preparing a corresponding multiple graphic layer structure templates.

28. The method for preparing nanoprinted articles as described in claim 27, characterized in that, Further comprising coating a glue layer on the side of the hydrophobic graphic layer away from the substrate layer, repeating steps S31-S41 to form multiple hydrophobic graphic layers, and setting nano pigment layers on each of the hydrophobic graphic layers to present different color effects.

29. The method for preparing nanoprinted articles as described in claim 28, characterized in that, Before coating the glue layer on the side of the hydrophobic graphic layer away from the substrate layer, further comprising plating a medium layer, the medium layer covering the hydrophobic graphic layer and the nano pigment layer, the medium layer having a different refractive index from the hydrophobic graphic layer, and the refractive index difference being greater than 0.

5.

30. The method for preparing nanoprinted articles as described in claim 26, characterized in that, The step S31 further comprises using different graphic structure templates to perform imprinting in different areas, filling different aqueous nano pigment into the grooves in different graphics, and drying to present different color effects in different areas.

31. The method for preparing nanoprinted articles as described in claim 26, characterized in that, The step S41 further comprises recycling the cleaned liquid at the same time.

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