Color-changing material based on angle color-changing mechanism of sauna multilayer structure and preparation method of color-changing material

Abstract

The invention relates to an angle color changing model based on a papilionics concave multilayer structure, which comprises model units arranged in an array mode, each model unit comprises a color information layer and a transparent layer, and the transparent layer covers the color information layer; the color information layer comprises a rectangular thin layer, a center hole position is formed in the geometric center position of the rectangular thin layer, the rectangular thin layer is divided into an even number of blocks, the blocks are filled with pigment colors, and the rectangular thin layer at least comprises two different pigment colors; the transparent layer is recessed from the surface to the central hole position of the rectangular thin layer to form a three-dimensional recessed space, the recessed space comprises a plurality of inclined planes, and the inclined planes are radially arranged in the direction away from the center by taking the central hole position as the center; the included angle between the inclined plane and the rectangular thin layer is 45-75 degrees; and the ratio of the total thickness of the transparent layer to the width of the rectangular thin layer is 0.75-1.2. Based on the model, a papilio simulation angle color-changing material can be prepared in combination with a full-color 3D printing technology, and simulation of dynamic colors of a papilio sunken multilayer structure under a macroscopic view angle is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of new materials, and in particular to a color-changing material based on the angle color-changing mechanism of a swallowtail butterfly concave multilayer structure and a preparation method thereof. Background Art

[0002] Colors can be divided into structural colors, pigment colors, and combined colors. The mechanisms of these two colors are different, but both can make objects appear in specific colors. Structural colors are colors produced by pure physical structures without any pigment factors. Pigment colors are colors produced based on the absorption or dispersion of light by pigments. Combined colors are biological forms that are a combination of pigment colors and structural colors. Among them, structural colors have many advantages that post-pigment colors do not have. Compared with pigment colors that are easily affected by the environment and change, structural colors are usually composed of simple physical structures. As long as their own physical structure is not destroyed, their colors will not diminish. Structural colors not only have high brightness and high saturation, but also usually have iridescent effects. Structural colors do not rely on chemical substances such as toxic pigments, and are environmentally friendly.

[0003] At present, the preparation methods of single structural color materials can be divided into the following according to the optical principle of structural color: ① Rainbow film, titanium alloy anodized film, color-changing pearlescent powder, electroplating fantasy color, etc. involved in multilayer thin film interference. ② Laser direct writing, photolithography, CNC machining, etc. involved in grating diffraction. ③ Cu2O sphere Mie scattering structural color coloring involved in scattering. ④ Dichroic glass, polarization display, etc. involved in polarized light. ⑤ Photonic crystal structural color fiber, photonic crystal structural color fabric, photonic crystal pigment, 3D printing preparation of graphic photonic crystals, etc. involved in photonic crystals. ⑥ Use natural biological materials to bond structural colors, etc. In order to obtain precise color effects, the preparation of the above-mentioned single structural color materials requires precise control of the microstructure morphology of the material, which not only requires high-precision operation, but also needs to be carried out under extremely stable environmental conditions. During the preparation process, continuous optimization is required to achieve high consistency and repeatability of color, which not only requires high-precision equipment, but also places very high demands on the professional knowledge and practical experience of designers or operators. These factors limit the effective preparation and widespread application of structural color dynamic color-changing materials, and according to the existing technology, it is difficult to achieve color simulation and color control for specific purposes using the currently easily available color-changing materials.

[0004] Lan Cuiqin, He Shuang and others found in the article "Research on Design Innovation Methods of Learning from Nature - Exploration of Digital Biological Design Paths" that leopard chameleons change colors by actively adjusting the guanine nanocrystal lattice in the iris cells of the epidermis and dermis. Based on this inspiration, industry researchers can combine the bottom color information layer with the upper transparent crystal layer (which plays a refractive role) and adjust the crystal structure to obtain the dynamic change effect of color under the influence of light refraction of different crystal structures. In addition, the structural color on the wings of swallowtail butterflies usually has very high brightness and saturation. This high brightness and saturation is due to the fact that its micro-nano structure can efficiently control the interference, diffraction and scattering of light. For example, the wings of Morphobutterflies show a strong blue luster in the sun, which is very bright and has a metallic texture. With people's continuous pursuit of quality of life, simulation materials based on the color mechanism of butterfly wings are becoming more and more popular and concerned in the fields of mobile terminals, automobile production, clothing manufacturing, etc. However, how to model and optimize model parameters to obtain a color structure model with the optimal color effect of simulating swallowtail butterfly wings is still the problem that needs to be solved first. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a color-changing material based on the angular color-changing mechanism of the Papilio butterfly sunken multilayer structure and a preparation method thereof. By constructing an angular color-changing model of the Papilio butterfly sunken multilayer structure and optimizing the model structure parameters, a color structure model with optimal color effect is obtained, and the Papilio butterfly simulation material is prepared in combination with the Stratasys 3D inkjet voxel printing technology, thereby realizing the simulation of the dynamic color of the Papilio butterfly sunken multilayer structure from a macroscopic perspective.

[0007] (II) Technical solution

[0008] In a first aspect, the present invention provides an angle color-changing model based on a Papilio concave multilayer structure, comprising: a plurality of model units arranged in an array, each model unit comprising a color information layer and a transparent layer, the transparent layer covering and bonding the color information layer; the color information layer comprising a rectangular thin layer, a central hole being provided at a geometric center position of the rectangular thin layer; the rectangular thin layer being divided into an even number of blocks, the blocks being filled with pigment colors, the pigment colors on the rectangular thin layer comprising at least two different pigment colors;

[0009] The transparent layer is recessed from the surface toward the central hole of the rectangular thin layer to form a three-dimensional recessed space, and the three-dimensional recessed space includes a plurality of inclined surfaces, each of which is radially arranged away from the center with the central hole as the center, and the recessed space is centrally symmetrical with an axis vertical to and passing through the central hole; the angle between the inclined surface connected to the rectangular thin layer and the plane where the rectangular thin layer is located is 45°-75°; wherein the ratio of the total thickness of the transparent layer to the width of the rectangular thin layer is 0.75-1.2.

[0010] In this application, no material is filled in the recessed space. In this application, the transparent layer and the recessed space together play a refractive role, and the recessed space extends all the way to the central hole, and the interior of the central hole is empty. Therefore, the depth of the recessed space is consistent with the height of the model unit.

[0011] According to a preferred embodiment of the present invention, in the model unit, the aspect ratio of the rectangular thin layer is 1:0.95-1.05 (preferably a square, i.e., the aspect ratio is 1:1), the length and width of the model unit are 2.5mm-6mm; the height of the model unit is 2.13mm-7.35mm; the thickness of the rectangular thin layer is 0.25mm-0.6mm; the angle between the inclined surface connected to the rectangular thin layer and the plane where the rectangular thin layer is located is 60°-75°. The height of the transparent layer is the height of the model unit minus the thickness of the rectangular thin layer, and the height of the transparent layer is 1.88mm-6.75mm.

[0012] The size of the model unit reaches a macroscopic size, which can simulate the dynamic color of the concave multilayer structure of the Papilio genus from a macroscopic perspective. The size and proportion of the model unit mentioned above can ensure that the 3D printed color-changing material has a good angle color-changing effect and color-developing smoothness. In practical applications, it can be adjusted according to the color-developing effect. While ensuring the aforementioned ratio and slope angle, if the 3D printing equipment and technology allow, a smaller model unit size can also be used, but the minimum should not be less than 2mm, otherwise the color-changing effect of the molding material will be poor.

[0013] According to a preferred embodiment of the present invention, the angle between the inclined surface connected to the rectangular thin layer and the plane where the rectangular thin layer is located is 60°-75°, preferably 63° or 70°.

[0014] According to a preferred embodiment of the present invention, the area of ​​the central hole occupies 4 / 64-9 / 64 of the area of ​​the rectangular thin layer, and the interior of the central hole is empty or filled with transparent material.

[0015] According to a preferred embodiment of the present invention, the rectangular thin layer of the color information layer is divided into two blocks by a diagonal line, and the two blocks are filled with different pigments; or the rectangular thin layer of the color information layer is divided into two blocks by a midline of a side, and the two blocks are filled with different pigments. For example, one block is filled with dark blue, and the other block is filled with light blue.

[0016] According to a preferred embodiment of the present invention, the rectangular thin layer of the color information layer is divided into four blocks by two intersecting diagonal lines, and the four blocks are filled with two pigments in an interlaced manner; or the rectangular thin layer of the color information layer is divided into four blocks by the midlines of two adjacent sides, and the four blocks are filled with two pigments in an interlaced manner. For example, the first block is filled with dark blue, the second block adjacent to it is filled with light blue, the third block adjacent to the second block is filled with dark blue, and the fourth block adjacent to it is filled with light blue.

[0017] In practical applications, the distribution and proportion of the transparent layer and the color information layer in the model unit can be optimized and adjusted. Through optimization and adjustment, the interaction of light between different layers can be further accurately controlled to achieve the purpose of simulating the angular color change phenomenon of the concave multi-layer structure.

[0018] According to a preferred embodiment of the present invention, in the angular color-changing model based on the Papilio concave multi-layer structure, multiple model units are continuously arranged in an array in a manner that blocks with the same color in the color information layer are adjacent; or, multiple model units are continuously arranged in an array in a manner that blocks with different colors in the color information layer are adjacent.

[0019] According to a preferred embodiment of the present invention, the transparent layer is only one layer, and the transparent layer is recessed from the surface toward the central hole of the rectangular thin layer to form a concave space in the shape of a quadrangular pyramid, the four faces of the concave space are isosceles trapezoidal slopes, the angle between the slope and the horizontal plane where the rectangular thin layer is located is 45°-75° (preferably 60-75°), and the center of the bottom surface of the concave space is aligned with the central hole of the rectangular thin layer in the vertical direction. Preferably, when the aspect ratio of the rectangular thin layer is 1:1, the concave space is in the shape of a regular quadrangular pyramid.

[0020] In some embodiments of the present invention, the transparent layer includes a plurality of stacked sub-layers, each of which has a recessed space formed in the middle, and the order from bottom to top is arranged in the following manner: the first sub-layer is recessed from the surface toward the central hole of the rectangular thin layer to form a first recessed space in the shape of a quadrangular pyramid; the second sub-layer is recessed from the surface toward the first recessed space to form a second recessed space in the shape of a quadrangular pyramid, and according to this rule, the nth sub-layer is recessed from the surface toward the n-1th recessed space to form an nth recessed space in the shape of a quadrangular pyramid; the angles between the surrounding slopes of the recessed spaces of each sub-layer and the horizontal plane where the rectangular thin layer is located are the same or different.

[0021] In some embodiments of the present invention, the side wall of the recessed space is a convex octagonal cone or a cross, and the horizontal cross section of the recessed space is a convex octagon or a cross composed of twelve sides. And the inclined surface of the recessed space is composed of multiple connected inclined surfaces from the bottom to the top, and the inclined angles of each connected inclined surface and the color information layer are different or the same. In this embodiment, the number of inclined surfaces is large, and the molded color-changing material can reflect more colors. Under the conception of the scheme of the present invention, the specific shape of the model unit can be selected according to the desired effect of the material.

[0022] In a second aspect, the present invention provides a method for preparing a color-changing material based on the angle color-changing mechanism of the swallowtail butterfly concave multilayer structure, which comprises the following steps:

[0023] The angular color-changing model based on the multi-layer structure of the Papilio genus recessed as described in any of the above embodiments is modeled; then, the color information layer is printed with a colored photosensitive polymer material, and the transparent layer is printed with a transparent photosensitive polymer material using the Stratasys 3D inkjet voxel printing technology; after printing, the color-changing material is cured under UV light to obtain the angular color-changing mechanism of the multi-layer structure of the Papilio genus recessed.

[0024] In a third aspect, the present invention provides a color-changing material based on the angle color-changing mechanism of the swallowtail butterfly concave multilayer structure, which is prepared by the above preparation method. The refractive index of the transparent photosensitive polymer material is preferably 1.55-1.60 (preferably 1.56).

[0025] (III) Beneficial effects

[0026] The present invention obtains a color structure model with optimal color effect by constructing an angular color-changing model based on the concave multilayer structure of Papilio genus and optimizing the model structure parameters. The Papilio simulation material is prepared by combining the Stratasys 3D inkjet voxel printing technology, and the simulation of the dynamic color of the concave multilayer structure of Papilio genus is realized from a macroscopic perspective.

[0027] The present invention simplifies and designs the transparent layer structure, including the thickness of the transparent layer (the ratio of the width of the rectangular thin layer) and the shape of the recessed space, so as to achieve the effect of affecting the propagation path of light in the multi-layer structure. By simplifying the multi-layer recessed structure, the technical difficulty of preparing the angle-chromic material is reduced, and the material consumption is also reduced.

[0028] The present invention uses photosensitive materials for printing, thereby enabling the use of easily available and inexpensive materials to achieve color simulation and color control of the dynamic colors of the Papilio concave multilayer structure.

[0029] The present invention can print within a model unit size range of 6mm-2.5mm, does not require precise control of the material microstructure morphology, and has low operating precision requirements. Compared with the current preparation technology of single structural color materials, the present invention prepares color-changing materials based on the angle color-changing mechanism of the swallowtail butterfly concave multilayer structure, which does not need to be carried out under extremely stable environmental conditions. The preparation process is simple and easy to control, with high repeatability and consistency. Through the technology of the present invention, the dynamic angle color-changing simulation materials of the genus Swallowtail are further promoted and applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This study is an analysis of the differences in color and angular color change of the multi-layer depressed structural color of the genus Papilio.

[0031] Figure 2 The present invention is a construction process of the angular color change model based on the concave multi-layer structure of Papilio genus.

[0032] Figure 3 This is a schematic structural diagram of a model unit in the angular color-changing model based on the Papilio concave multi-layer structure constructed in Example 1.

[0033] Figure 4 According to Example 1 Figure 3 The constructed model was produced using a photo of a color-changing material produced using Stratasys full-color 3D printing.

[0034] Figure 5 These are two different color layouts of the color information layer in the model unit of Example 3.

[0035] Figure 6 The model units of Example 3 are arrayed in two different ways.

[0036] Figure 7 This is a schematic diagram showing that the transparent layer in Example 4 is composed of a plurality of transparent layer sub-layers stacked together.

[0037] Figure 8 This is a schematic diagram showing that the recessed space of the transparent layer in Example 5 is in the shape of a convex octahedral cone or a cross. DETAILED DESCRIPTION

[0038] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0039] Example 1

[0040] This embodiment constructs an angular color change model based on the concave multi-layer structure of the Papilio genus. The model construction process is as follows: the microscopic structure data of the structural color scales of the Little Angel Papilio, the Paradise Papilio, and the Green Band Papilio in the typical multi-layer concave structure with iridescence phenomenon of the Papilio genus are summarized, and the reasons for the differences in color and angular color change of the multi-layer concave structural color of the Papilio genus are compared and analyzed. The analysis results are as follows: Figure 1 . The scales of the swallowtail butterfly are in the micron level, and the iridescent scales are composed of two forms: structural color scales and structural color scales + pigment color scales. The refractive index of the chitin layer is 1.56, the thickness of the air layer is 100-150nm, and the refractive index of the air layer (there will be some cuticle structures in the middle of the air layer) is 1.1-1.2, which is greater than the refractive index of pure air. There are a large number of depressions on the scales, with an inclination angle of 30-45°, a diameter of 4-6μm, and a depth of 1.5-2μm. The number of chitin layers is 7-11. Obviously, this natural multi-layer depression structure of the genus Papilio is too complex. Directly modeling the actual morphology of the iridescent scales of the genus Papilio will make the preparation of color-changing simulation materials extremely difficult and costly, and it cannot be used for production application and development.

[0041] In order to transform the angle color-changing principle of Papilio into an industrially applicable color-changing material and simulate the color-changing effect of Papilio, the present invention constructs a preliminary three-dimensional model based on the multi-layer sunken structure prototype of Papilio green-banded. Then, the preliminary three-dimensional model is adjusted as follows to obtain an angle color-changing model based on the sunken multi-layer structure of Papilio.

[0042] Step 1: Build a 3D model based on the multi-layered concave structure prototype of the green-banded Papilio emeraldii, and obtain the following Figure 2 (a) is a multiple connected concave multi-layer structure model; the concave multi-layer structure model includes several transparent layers, a concave space structure in the middle of the transparent layer, and multiple transparent layers are stacked on top of a bottom supporting layer, and the bottom supporting layer has color information.

[0043] Step 2: Disassemble the above multiple connected concave multi-layer structure models to obtain Figure 2 The single multi-layer depression shown in (b) is combined with a color-changing model, and the 45° inclined portion of the bottom side wall of the depression multi-layer structure is filled with a transparent layer.

[0044] Step 3: Simplify the structure of a single multi-layer concave combined color-changing model, reduce the number of bottom support layers and transparent layers, and obtain a single single-layer concave combined color-changing model. According to the diffraction grating principle formed by the array arrangement of multiple concave structures, the single single-layer concave combined color-changing model is arranged in an array to obtain the following: Figure 2 The combination of multiple single-layer depressions combined with color-changing models shown in (c). By simplifying the multi-layer depression structure, the difficulty and cost of preparing the angle-changing material can be reduced, and the model structure is arranged in an array using the diffraction grating principle formed by the array arrangement of multiple depression structures to achieve the angle-changing phenomenon.

[0045] Step 4: Fill the bottom support layer with color blocks to obtain a color information layer. Figure 2 The multiple single-layer concave combined color-changing model array shown in (d) is finally adjusted to adjust the aspect ratio of the color information layer so that the angle color-changing phenomenon of the multiple single-layer concave combined color-changing model is coherent and natural. The final effect is as follows Figure 2 As shown in (e).

[0046] Combination Figure 3 As shown, Figure 2 (e) is an enlarged view of a model unit 10 in the angle color-changing model based on the recessed multilayer structure of the Papilio genus. The model unit 10 includes a color information layer 11 and a transparent layer 12. The transparent layer 12 covers the color information layer 11. The color information layer 11 is composed of a rectangular thin layer and a pigment color. A central hole 110 is provided at the geometric center of the rectangular thin layer. Among them, the area of ​​the central hole 110 accounts for 4 / 64-9 / 64 of the area of ​​the rectangular thin layer, and the interior of the central hole is empty. The transparent layer 12 is recessed from the surface toward the central hole 110 of the rectangular thin layer to form a recessed space in the shape of a quadrangular pyramid, and the four faces of the recessed space are isosceles trapezoidal inclined planes 120, and the angle between the inclined plane 120 and the horizontal plane where the rectangular thin layer is located is 45°-75°. The recessed space is a centrally symmetrical body figure with an axis vertical to and passing through the central hole 110. The center of the bottom surface of the concave space is connected to the central hole 110 of the rectangular thin layer, and the depth of the concave space is consistent with the thickness of the outer contour of the model unit 10. The rectangular thin layer is divided into an even number of blocks, and the blocks are filled with pigments. The pigments on the rectangular thin layer include at least two different pigments. For example, Figure 3 As shown in (a), (b) and (c), the rectangular thin layer of the color information layer 11 is divided into two blocks by a diagonal line, one block is filled with dark blue, and the other block is filled with light blue. Figure 3 As shown in (d), the rectangular thin layer of the color information layer 11 is divided into two blocks by the middle line of one side, and the two blocks are filled with different pigments. When the rectangular thin layer is filled with pigments, the color information layer 11 is obtained.

[0047] The concave space in the middle of the transparent layer 12 includes a plurality of inclined surfaces 121, the number of which is an even number, and each inclined surface 121 is arranged radially away from the center with the central hole as the center, and the angle between the inclined surface 121 and the plane where the rectangular thin layer is located is 45°-75°. For example, Figure 3 (a) The angle between the inclined surface 121 and the rectangular thin layer is 45°, Figure 3 (b) The angle between the inclined surface 121 and the rectangular thin layer is 63°, Figure 3 (c) The included angle between the inclined surface 121 and the rectangular thin layer is 70°.

[0048] Further, by comparing the effect of the angle of the bevel 121 of the three-dimensional recessed space on the angle color change effect, the results show that when the angle of the bevel 121 is in the range of 60°-75°, the angle color change effect is better and the smoothness of the angle color change is better. Therefore, it is preferred to make the angle of the bevel of the three-dimensional recessed space relative to the rectangular body thin layer between 60°-75°. When the angle of the bevel 121 is fixed at 63°, the effect of the ratio of the height of the transparent layer 12 to the side length of the rectangular body thin layer on the angle color change effect is compared. The results show that the ratio of the height of the transparent layer 12 to the side length of the rectangular body thin layer is in the range of 0.75-1.2, the angle color change effect is better, and the smoothness of the angle color change is better. After the bevel angle or the thickness (height) of the transparent layer is further increased, the angle color change of the color-changing material prepared thereby becomes non-smooth.

[0049] In order to simulate the dynamic color of the concave multilayer structure of the Papilio genus from a macroscopic perspective, the size of the model unit 10 is optimized, and the aspect ratio of the rectangular thin layer is finally determined to be 1:0.95-1.05, preferably a square, and the side length is 2.5mm-6mm. The concave space in the middle of the transparent layer 12 is not filled with any material, and it plays a refraction and diffraction grating role with the transparent layer to achieve the angular color change effect of simulating the wings of the Papilio genus. The thickness of the transparent layer 12 ranges from 1.88mm to 6.75mm, and the thickness of the color information layer 11 is 0.25mm-0.6mm. There is no special restriction on the thickness of the color information layer 11, as long as it can be printed by 3D and carry the pigment color information. The length and width of the entire model unit 10 are consistent with the rectangular thin layer, and the height of the model unit 10 is 2.13mm-7.35mm. By comparing the 3D printing effects of model units designed with different size ranges and ratios, the color-changing material finally printed out by the model unit that meets the above range has the best angle color-changing effect and the best smoothness of the angle color-changing effect, while the specific shape of the recessed space can have different deformations.

[0050] When the size of the model unit 10 is too small compared to the above range, the difficulty of preparing the angle-chromic material will increase exponentially, the precision requirement will be too high, the preparation process will be difficult to control, and the product color rendering effect will be poor; and when the scale of the model unit 10 exceeds the above range, it will lead to the smoothness of the angle color change phenomenon, the angle color change effect will be poor, and the color rendering will be obviously discontinuous. In practical applications, it can be adjusted within this range according to the color rendering effect. In practical applications, the distribution and proportion of the transparent layer 12 and the color information layer 11 in the model unit can also be optimized and adjusted. Through optimization and adjustment, the interaction between the light in different layers can be further accurately controlled to achieve the purpose of simulating the angle color change phenomenon of the concave multi-layer structure.

[0051] Example 2

[0052] This embodiment provides a method for preparing a color-changing material based on the angle color-changing mechanism of the swallowtail butterfly concave multilayer structure, which comprises the following steps:

[0053] (1) According to Example 1 Figure 3 The model units 10 shown in (a), (b) and (c) are modeled and arrayed to obtain an angle color-changing model based on the multi-layer structure of the Papilio genus. Among them, the aspect ratio of the rectangular thin layer (color information layer 11) is 1:1, the side length is 4 mm, the angles between the inclined surface of the concave space and the color information layer 11 are 45°, 63° and 70° respectively, the thickness of the transparent layer 12 is 1.5 mm, 3.0 mm, 4.5 mm, and the thickness of the color information layer 11 is 0.4 mm.

[0054] (2) Stratasys full-color 3D printing technology was used to print the dark blue and light blue parts of the color information layer 11 with colored photosensitive polymer materials, and to print the transparent layer 12 with a transparent photosensitive polymer material with a refractive index of 1.56. After 3D printing, the material was irradiated with 500W UV light for 3 minutes to cure and fix the shape, thereby obtaining a color-changing material based on the angle color-changing mechanism of the swallowtail butterfly concave multilayer structure. The solid photo of the prepared color-changing material is shown in FIG. Figure 4 As shown in (a), (b) and (c).

[0055] Example 3

[0056] The angle color-changing model based on the concave multilayer structure of Papilio genus finally constructed in this embodiment is different from that in embodiment 1, and the main difference is that the rectangular thin layer of the color information layer 11 is divided into four blocks. The four blocks are respectively filled with different pigments or the four blocks are filled with two pigments in an alternating manner.

[0057] like Figure 5As shown in (a), the rectangular thin layer of the color information layer 11 of the model unit 10 is evenly divided into four blocks by two diagonal lines, the first block is filled with dark blue, the second block adjacent to it is filled with light blue, the third block adjacent to the second block is filled with dark blue, and the fourth block adjacent to it is filled with light blue. Figure 5 As shown in (b), the rectangular thin layer of the color information layer 11 of the model unit 10 is evenly divided into four blocks by two diagonal lines. The first block is filled with dark blue, the second block adjacent to it is filled with light blue, the third block adjacent to the second block is filled with dark blue, and the fourth block adjacent to it is filled with light blue.

[0058] In getting Figure 5 After the model unit 10 shown in (b), the array arrangement of the model unit 10 includes two types: Figure 6 As shown in (a), the blocks with the same color in the color information layer 11 are arranged in an array in a continuous manner; or Figure 6 As shown in (b), blocks with different colors on the color information layer are arranged in an array in a continuous manner, which can be adjusted according to the angle color change effect.

[0059] In other embodiments, among the above four blocks, 3 / 4 of the blocks may be filled with one pigment color, and the remaining 1 / 4 may be filled with another pigment color. Specifically, different pigment colors may be filled in a designed proportion according to the color rendering effect.

[0060] In other embodiments, the rectangular thin layer of the color information layer 11 can be further divided into 8 or even 16 blocks, which are arranged radially from the center to the outside with respect to the central hole 110 of the rectangular thin layer, and the blocks are filled with two pigment colors in an alternating manner.

[0061] Example 4

[0062] The angular color-changing model based on the Papilio concave multi-layer structure finally constructed in this embodiment is different from that in Embodiment 1, and the main difference is that the number of transparent layers 12 is different.

[0063] like Figure 7 As shown in (a), in this embodiment, the transparent layer 12 includes a plurality of stacked sub-layers 121, and the ratio of the total height of the transparent layer to the side length of the rectangular thin layer is in the range of 0.75-1.2, and the side length of a single model unit 10 is controlled to be 6mm-2.5mm (consistent with the length and width of the bottom color information layer 11). Figure 7As shown in (a), the slope of the recessed space in this embodiment is multi-stage, and the angle of each slope is the same or different. At this time, the middle of each sub-layer 121 in the transparent layer 12 forms a recessed space, and the order from bottom to top is arranged in the following manner: the first sub-layer is recessed from the surface toward the central hole 110 of the rectangular thin layer to form a first recessed space in the shape of a quadrangular pyramid; the second sub-layer is recessed from the surface toward the first recessed space to form a second recessed space in the shape of a quadrangular pyramid. According to this rule, the third sub-layer is recessed from the surface toward the second recessed space to form a third recessed space in the shape of a quadrangular pyramid. Among them, the angles of the surrounding slopes of the recessed space of each sub-layer and the horizontal plane where the rectangular thin layer is located are different. When the angles of the surrounding slopes of the recessed space of each sub-layer and the horizontal plane where the rectangular thin layer is located are the same, these stacked sub-layers 12 can be regarded as a continuous layer of transparent layer 12.

[0064] When the ratio of the total thickness of the transparent layer of the model unit 10 to the color information layer 11 is set to 1.2, the angle between the inclined surface of the first sub-layer corresponding to the concave space and the color information layer 11 is set to 75°, and the color information layer 11 is a square with a side length of 5.6 mm, the color of the pigment of the color information layer 11 is as follows: Figure 7 (a) is arranged in the manner of Example 2. After the photosensitive material is 3D printed, the color development effect of the material is as follows Figure 7 If the ratio of the total thickness of the transparent layer to the color information layer 11 or the angle of the bevel is further increased, the angular color change effect of the material will be delayed.

[0065] Example 5

[0066] This embodiment is different from the angle color changing model based on the concave multilayer structure of Papilio genus finally constructed in the embodiment 1, and the main difference is that the three-dimensional shape of the concave space in the middle of the transparent layer 12 is different. Figure 8 As shown in (b), the side wall of the recessed space is a convex octagonal cone, the horizontal cross-section of the recessed space is an octagon, and the transparent layer 12 of the model unit 10 has four sharp corners.

[0067] like Figure 8 As shown in (a), the three-dimensional shape of the recessed space in the middle of the transparent layer 12 is a "cross shape", and the horizontal cross section of the recessed space is a cross shape composed of twelve sides. The four sharp corners of the transparent layer 12 are respectively cut by a plane with an angle of about 2-5° with the horizontal plane, forming an inclined plane with an angle of 2-5° with the horizontal plane. When the cross-shaped recessed space is at the bottom, the width of its cross surface is the smallest and gathers into two cross-intersecting line segments. From the bottom to the top, the width of the cross surface increases gradually as it approaches the top of the recessed space. Therefore, as Figure 8 The model unit shown in (a) has a concave space which is a three-dimensional shape composed of a number of crosses that are gradually enlarged from bottom to top.

[0068] Material molding effect: When the angle between the slope of the recessed space of the model unit and the color information layer 11 is set to 63°, the ratio of the total thickness of the transparent layer 12 to the color information layer 11 is set to 0.84, and the color information layer 11 is a square with a side length of 4 mm, the color of the pigment of the color information layer 11 is as follows: Figure 8 According to the method of Example 2, after the photosensitive material is 3D printed, the color development effects of the material are as follows: Figure 8 As shown in (c) and (d). As can be seen from the figure, compared with the above-mentioned embodiments, the number of inclined surfaces of the concave space around the central hole is generally an even number, and the three-dimensional shape of the concave space is a central symmetric body. The more inclined surfaces there are, the more colors are reflected. The angle color change effect is slightly worse than that of Example 1, but at the same time, this embodiment can give the material a crystal clear look while making the material have the angle color change of the simulated swallowtail butterfly. In production applications, the specific model unit shape can be selected according to the color development needs of the product.

[0069] In other embodiments, the transparent layer 12 is recessed toward the central hole 110 of the rectangular thin layer to form a recessed space in the shape of a convex octahedron or a cross, and the slope of the recessed space is composed of multiple connected slopes from the bottom to the top, and the inclination angle between each connected slope and the color information layer 11 is different or the same.

[0070] In summary, in view of the difficulty in preparing a single structural color material with an angle color-changing effect, high operating precision, strong professional requirements, and the current situation where high-precision equipment and expensive materials are difficult to obtain, the present invention constructs an angle color-changing model based on the Papilio genus recessed multilayer structure, plans the layout of the color information layer 11, adjusts the thickness of the transparent layer 12 and the shape and parameters of the recessed space, and realizes the simulation of the angle color-changing phenomenon of the Papilio genus recessed multilayer structure. The main contents of the present invention include digital model construction, model structure parameter optimization, and an integrated preparation technology for simulating the dynamic angle color-changing material of the Papilio genus recessed structure based on full-color 3D printing. Among them, the color phenomenon of the dynamic change of the structural color of the Papilio genus recessed multilayer structure is simulated by planning the layout of the color information layer 11. The model design of the color information layer 11 takes into account the mixing and superposition optical effects of the pigment color and the transparent layer 12 when the color array is arranged, so as to realize the simulation of the color-changing phenomenon at a specific angle. Compared with the prototype of the multi-layer concave structure of the Papilio genus, the thickness of the transparent layer 12 and the shape of the concave space that play an optical effect are simplified and redesigned during the modeling process to achieve the effect of affecting the propagation path of light in the multi-layer structure, and the length and width of the model unit are expanded to the range of 2.5mm-6mm, which greatly reduces the technical difficulty and reduces material consumption. In addition, in the aforementioned embodiments, the model unit with a concave space in the shape of a quadrangular pyramid constructed in Embodiments 1-2, the color-changing material formed by 3D printing has the best angle color-changing effect, especially when the bevel angle is 60-70 degrees, the angle color-changing effect of the material is the smoothest.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features therein may be replaced by equivalents. These modifications or replacements, or the technical features in the above embodiments may be combined in the manner described in the embodiments if they do not conflict with each other, and these modifications, replacements or combinations do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An angular color change model based on the concave multi-layer structure of Papilio genus, characterized in that: It includes: A plurality of model units are arranged in an array, each model unit comprises a color information layer and a transparent layer, the transparent layer is covered and combined on the color information layer; the color information layer comprises a rectangular thin layer, a central hole is provided at the geometric center of the rectangular thin layer; the rectangular thin layer is divided into an even number of blocks, the blocks are filled with pigment colors, and the pigment colors on the rectangular thin layer include at least two different pigment colors; The transparent layer is recessed from the surface toward the central hole of the rectangular thin layer to form a three-dimensional recessed space, and the three-dimensional recessed space includes a plurality of inclined surfaces, each of which is radially arranged away from the center with the central hole as the center, and the recessed space is centrally symmetrical with an axis vertical to and passing through the central hole; the angle between the inclined surface connected to the rectangular thin layer and the plane where the rectangular thin layer is located is 45°-75°; wherein, the ratio of the total thickness of the transparent layer to the width of the rectangular thin layer is in the range of 0.75-1.

2.

2. The angle color changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: In the model unit, the aspect ratio of the rectangular thin layer is 1:0.95-1.05, the length and width of the model unit are 2.5mm-6mm, the height of the model unit is 2.13mm-7.35mm, and the thickness of the rectangular thin layer is 0.25mm-0.6mm; the angle between the inclined surface connected to the rectangular thin layer and the plane where the rectangular thin layer is located is 60°-75°.

3. The angular color-changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: The number of the inclined surfaces is an even number, the area of ​​the central hole occupies 4 / 64-9 / 64 of the area of ​​the rectangular thin layer, and the interior of the central hole is empty.

4. The angular color-changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: The rectangular thin layer of the color information layer is divided into two blocks by a diagonal line, and the two blocks are filled with different pigments respectively; or the rectangular thin layer of the color information layer is divided into two blocks by a midline of a side, and the two blocks are filled with different pigments respectively.

5. The angle color changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: The rectangular thin layer of the color information layer is divided into four blocks by two intersecting diagonal lines, and the four blocks are filled with two pigment colors in an alternating manner; or the rectangular thin layer of the color information layer is divided into four blocks by the midlines of two adjacent sides, and the four blocks are filled with two pigment colors in an alternating manner.

6. The angle color changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: In the angular color-changing model based on the Papilio concave multi-layer structure, multiple model units are arranged in an array in a continuous manner with adjacent blocks of the color information layer having the same color; or, multiple model units are arranged in an array in a continuous manner with adjacent blocks of the color information layer having different colors.

7. The angular color-changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: The transparent layer is only one layer, and the transparent layer is recessed from the surface toward the central hole of the rectangular thin layer to form a recessed space in the shape of a quadrangular pyramid. The four faces of the recessed space are isosceles trapezoidal slopes, and the angle between the slope and the horizontal plane where the rectangular thin layer is located is 45°-75°. The center of the bottom surface of the recessed space is aligned with the central hole of the rectangular thin layer in the vertical direction.

8. The angle color changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: The transparent layer comprises a plurality of stacked sub-layers, each of which has a concave space formed in the middle, and the order from bottom to top is arranged in the following manner: the first sub-layer is concave from the surface toward the central hole of the rectangular thin layer to form a first concave space in the shape of a quadrangular pyramid; The second sublayer is recessed from the surface toward the first recessed space to form a second recessed space in the shape of a quadrangular pyramid. According to this rule, the nth transparent layer is recessed from the surface toward the n-1th recessed space to form the nth recessed space in the shape of a quadrangular pyramid. The angles between the four surrounding slopes of the recessed space of each sublayer and the horizontal plane where the rectangular thin layer is located are the same or different.

9. The angle color changing model based on the Papilio concave multilayer structure according to claim 1, characterized in that: The side wall of the recessed space is a convex octagonal cone or a cross, and the horizontal section of the recessed space is a convex octagon or a cross composed of twelve sides.

10. A method for preparing a color-changing material based on the angle color-changing mechanism of the swallowtail butterfly concave multilayer structure, characterized in that: The steps include: Modeling is performed according to the angle color-changing model based on the concave multilayer structure of Papilio genus according to any one of claims 1 to 9; then, the color information layer is printed with a colored photosensitive polymer material and the transparent layer is printed with a transparent photosensitive polymer material using Stratasys 3D inkjet voxel printing technology; After printing is completed, it is cured under UV light to obtain the color-changing material based on the angle color-changing mechanism of the swallowtail butterfly concave multi-layer structure.

11. A color-changing material based on the angle color-changing mechanism of the swallowtail butterfly concave multilayer structure, characterized in that: The material is prepared by the preparation method of claim 10; the refractive index of the transparent photosensitive polymer material is 1.55-1.60.

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