Structural chromogenic functional film

Abstract

The utility model relates to the field of films, in particular to a structural chromogenic functional film, which comprises a structural chromogenic layer. The structural chromogenic layer is a resin layer comprising nano-structural chromogenic particles; and the structural chromogenic functional film is a film layer with ductility. According to the utility model, the nano-structure color-producing particles are dispersed in the resin layer, so that the nano-structure color-producing particles for color development can still be relatively uniformly distributed in the structural color-producing functional film at effective intervals even if the structural color-producing functional film is extended and stretched in the subsequent use process; therefore, sufficient scattering intensity is guaranteed, the color development uniformity of the functional film is greatly improved, and meanwhile, the problem of chromatic aberration of the structural chromogenic functional film before and after stretching is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of film, in particular to a structural color function film. BACKGROUND

[0002] At present, the decorative film on the market is mainly color-changing film, which can present different colors and effects on the surface of the decorated object. However, the colors of the color-changing film on the market are still realized by traditional colored dyes or pigments, which cannot avoid the problems of high production cost, complex production process, serious pollution and poor sun resistance.

[0003] In order to solve the above problems, people began to rely on nano-structured color-producing materials to provide bright appearance effects. Nano-structured color production is the color produced by the interaction between the micro-physical structure of nano-materials and visible light. This interaction includes scattering, interference or diffraction, etc. At present, nano-structured color-producing materials are directly arranged on the surface of the structure that needs to be colored, and other film layers are used for protection. However, such nano-film layers have poor color development effect in functional film layers that need to be stretched and deformed to a certain extent, and often have problems such as uneven color development and color deviation.

[0004] Therefore, how to solve the problem of uneven color development and color deviation of nano-structured color-producing materials in the process of deformation of the film layer is a problem that needs to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims to provide a structural color function film to solve the problem of uneven color development and color deviation of nano-structured color-producing materials in the process of deformation of the film layer in the prior art.

[0006] To solve the above technical problems, the utility model provides a structural color function film, which comprises a structural color layer.

[0007] The structural color layer is a resin layer comprising nano-structured color-producing particles.

[0008] The structural color function film is a film layer with ductility.

[0009] Optionally, in the structural color function film, when the structural color function film is stretched to a target elongation rate, the corresponding color difference value of the structural color function film is less than a preset tolerance color difference value.

[0010] Optionally, in the structural color function film, a base color layer is arranged below the structural color layer.

[0011] Optionally, in the structural color functional film, when the structural color functional film is stretched to a target elongation, the distance between the nano-structured color particles in the structural color layer is not more than the particle size of the nano-structured color particles.

[0012] Optionally, in the structural color functional film, the nano-structured color particles comprise an organic group covering layer.

[0013] Optionally, in the structural color functional film, the resin layer comprises at least one of a polyvinyl chloride resin layer, a polyurethane resin layer, a polyacrylate resin layer, and a fluororesin layer.

[0014] Optionally, in the structural color functional film, the nano-structured color particles comprise at least one of Cu2O particles, CuO particles, SiO2 particles, Al2O3 particles, ZrO2 particles, V2O5 particles, ZnO particles, CaS particles, CuS particles, Cu2S particles, CdS particles, CeO2 particles, ZnS particles, and TiO2 particles.

[0015] Optionally, in the structural color functional film, the particle size of the nano-structured color particles ranges from 100 nm to 700 nm, inclusive, and the particle size distribution index of the nano-structured color particles is not less than 95%.

[0016] The structural color functional film provided by the utility model, comprising a structural color layer; the structural color layer is a resin layer comprising nano-structured color particles; the structural color functional film is a film layer with ductility. The utility model disperses the nano-structured color particles in the resin layer, guarantees that even if the structural color functional film is stretched during subsequent use, the nano-structured color particles for color development can still be relatively uniformly and effectively distributed in the structural color functional film, so as to ensure that sufficient scattering intensity is obtained, thereby greatly improving the color development uniformity of the functional film and greatly improving the color difference problem of the structural color functional film before and after stretching. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0018] Figure 1 It is a structural schematic view of one specific embodiment of the structural color functional film provided by the utility model;

[0019] Figure 2A partial structure schematic view of one specific embodiment of the structural color-producing functional film provided by the utility model is provided.

[0020] Figure 3 A flowchart of one specific embodiment of the manufacturing method of the structural color-producing functional film provided by the utility model is provided.

[0021] In the figure, 10 is a structural color-producing layer, 20 is a base color layer, 30 is a transparent layer, 11 is a resin, and 12 is a nano-structural color-producing particle. Specific Embodiment

[0022] To make the person in the technical field better understand the utility model scheme, the utility model is further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] The core of the utility model is to provide a structural color-producing functional film, a structure schematic view of one specific embodiment of which is shown as Figure 1 The structural color-producing layer 10 is a resin layer comprising nano-structural color-producing particles 12.

[0024] The structural color-producing layer 10 is a resin layer comprising nano-structural color-producing particles 12.

[0025] The structural color-producing functional film is a film layer with ductility.

[0026] The nano-structural color-producing particles 12 are suspended in the resin layer, and of course, the more uniform the distribution of the nano-structural color-producing particles 12 in the resin layer is, the better.

[0027] As one specific embodiment, a base color layer 20 is arranged below the structural color-producing layer 10.

[0028] The base color layer 20 cooperates with the structural color-producing layer 10 to enhance the hiding effect of the structural color-producing functional film and improve the color development effect of the structural color-producing functional film. The base color layer 20 can be a black layer or a white layer or a color layer, which is not limited in the utility model. More preferably, the base color layer 20 is at least any one of a solid color layer, an effect layer, and an effect solid color layer.

[0029] Further, when the structural color-producing functional film is stretched to a target elongation rate, the corresponding color difference value of the structural color-producing functional film is less than a preset tolerance color difference value.

[0030] The change in color difference value is the color difference value of the structural color-producing functional film before and after stretching to the target elongation rate. In the preferred embodiment, the color difference value of the structural color-producing functional film before and after stretching is further limited to be within a reasonable range (less than the tolerance color difference value), so that the color development of the structural color-producing functional film does not change significantly even after stretching, thereby improving the color development stability of the structural color-producing functional film. Preferably, the tolerance color difference value is not greater than 3.

[0031] Further, when the structural color-producing functional film is stretched to the target elongation rate, the spacing of the nanostructured color-producing particles 12 in the structural color-producing layer 10 is not greater than the particle size of the nanostructured color-producing particles 12.

[0032] The target elongation rate is not greater than 500%.

[0033] The target elongation rate should be set according to the elongation rate of the structural color-producing functional film during use, i.e., the target elongation rate is the working elongation rate of the structural color-producing functional film, so that even if the structural color-producing functional film is stretched during use, the spacing of the nanostructured color-producing particles 12 is still not greater than the particle size of the nanostructured color-producing particles 12. Under this condition, the near-neighbor effect can occur between particles, the scattering intensity increases, and better color development is achieved. Of course, there are other similar effects, such as when the particles are arranged periodically, a photonic band gap can be formed, thereby preventing the propagation of light of certain frequencies and producing specific colors. When the particles are arranged randomly and disorderly, the nano-particles can scatter through multiple paths to produce a wide range of colors.

[0034] Further, the nanostructured color-producing particles 12 include an organic group covering layer.

[0035] Since the nanostructured color-producing particles 12 are inorganic compound structures and have a relatively high density, it has been difficult to uniformly disperse them in a high-molecular coating liquid for a long time. In order to further increase the uniform dispersion of the nanostructured color-producing particles 12 in the coating liquid and prevent the nanostructured color-producing particles 12 from settling in the coating liquid, the surface of the nanostructured color-producing particles 12 is chemically modified in the preferred embodiment to coat the surface with an organic group, thereby improving the compatibility of the nanostructured color-producing particles 12 with the resin 11 and further enhancing the uniform dispersion of the nanostructured color-producing particles 12 in the coating liquid. The nanostructured color-producing particles 12 can effectively prevent the settling of the nanostructured color-producing particles 12 from affecting the color realization effect during storage and processing. The dispersion and distribution of the nanostructured color-producing particles 12 in the resin 11 is shown in Figure 2

[0036] As a specific embodiment, the resin layer includes at least one of a polyvinyl chloride resin layer, a polyurethane resin layer, a polyacrylate resin layer, and a fluororesin layer.​

[0037] and / or

[0038] The nanostructured chromogenic particles 12 comprise at least one of Cu2O particles, CuO particles, SiO2 particles, Al2O3 particles, ZrO2 particles, V2O5 particles, ZnO particles, CaS particles, CuS particles, Cu2S particles, CdS particles, CeO2 particles, ZnS particles, TiO2 particles;

[0039] and / or

[0040] The nanostructured chromogenic particles 12 have a particle size in the range of 100 nm to 700 nm, inclusive, and a particle size distribution index of not less than 95%.

[0041] The above-mentioned materials and data ranges are the best ranges after a large number of theoretical calculations and actual tests, of course, appropriate adjustments can be made according to the actual situation, which will not be described here in detail.

[0042] As the nanostructured chromogenic particles 12 that can produce structural chromogenic, the basis for its ability to produce color lies in that the nanoparticles as the structural unit have strong electromagnetic resonance characteristics. According to Mie scattering theory, the scattering intensity of a single dielectric nanoparticle depends on its electric and magnetic resonance coefficients, which are influenced by the refractive index of the nanomaterial itself. Specifically, these coefficients depend on the refractive index of the particle sphere, the refractive index of the medium, and the wavelength of the incident light and the size of the dielectric particle sphere. The higher the refractive index, the stronger the electromagnetic resonance. Silicon is a common dielectric nanomaterial and has been extensively studied due to its high refractive index (n>3). Studies have reported that silicon nanoparticles of different diameters exhibit strong electromagnetic resonance effects in the visible light region. In the resonance scattering of silicon nanoparticles, magnetic dipoles and electric dipoles are dominant. The lowest order peak in the scattering spectrum corresponds to the magnetic dipole mode, showing significant size dependence, and the position of the reflection peak is approximately related to the diameter of the microsphere as λ=nd, where λ represents the position of the reflection peak, n is the refractive index of the nanostructured chromogenic particles 12, and d is the diameter of the nanostructured chromogenic particles 12.

[0043] Although there are many studies on silicon dielectric nanoparticles, the preparation of silicon nanoparticles depends on laser etching, chemical vapor deposition and other methods. These methods are expensive and have long preparation cycles, resulting in high cost and low efficiency. Unlike silicon dielectric nanoparticles, dielectric nanospheres with a medium refractive index (1.7 < n < 3.0), such as TiO2, Cu2O, CdS, ZnS and ZnO, can be synthesized in batches by chemical methods, which has become a new direction for current research on the electromagnetic resonance of dielectric nanoparticles. Theoretical calculations show that when the diameter of the dielectric nanosphere with a medium refractive index is greater than 200 nm, it has a strong magnetic resonance effect. In addition, unlike high-refractive-index dielectric nanospheres, the electric dipole and magnetic dipole resonances of medium-refractive-index nanospheres are overlapping. This scattering characteristic is further verified in the study of the scattering characteristics of various microspheres, such as TiO2 and Cu2O nanosphere particles. The measured scattering spectrum of Cu2O nanosphere particles is similar to the calculated scattering spectrum of medium-refractive-index nanospheres (n ~ 2.7). At the same time, with the increase of the diameter, the scattering peaks of these Cu2O nanosphere particles show a significant red shift. Similarly, TiO2 nanospheres also show the same trend, which can be used to select the material of the nanometer structure color-producing particles 12 in the utility model.

[0044] Therefore, dielectric nanosphere particles with a medium refractive index (1.7 < n < 3) have more application advantages due to their low cost and easy availability. The utility model selects dielectric nanometer structure color-producing particles 12 (Cu2O particles, CuO particles, SiO2 particles, Al2O3 particles, ZrO2 particles, V2O5 particles, ZnO particles, CaS particles, CuS particles, Cu2S particles, CdS particles, CeO2 particles, ZnS particles, TiO2 particles, etc.) with a medium refractive index, and controls the particle size of the nanometer color-producing material to realize the scattering of visible light of different wavelengths and adjust the different color presentation of the decorative film.

[0045] More preferably, the surface of the structure color-producing layer 10 is further provided with a transparent layer 30; the transparent layer 30 can be a bright transparent layer 30 or a matte transparent layer 30; the transparent layer 30 can be a colorless transparent layer 30 or a colored transparent layer 30.

[0046] Preferably, the target breaking elongation of the structure color-producing functional film is 100% to 500%; more preferably, the breaking elongation of the structure color-producing functional film is 200% to 400%.

[0047] The structural coloration functional film provided by the utility model, including structural coloration layer 10, the structural coloration layer 10 is the resin layer including nano structural coloration particle 12, the structural coloration functional film is the film layer with ductility, the utility model discloses by the nano structural coloration particle 12 is dispersed in the resin layer, guarantees the subsequent use process, even if the structural coloration functional film is stretched, the nano structural coloration particle 12 for color development still can be relatively evenly and distance effectively distributed in the structural coloration functional film, to ensure that enough scattering intensity is obtained to greatly improve the color development uniformity of functional film, and the color difference problem of structural coloration functional film before and after stretching is greatly improved.

[0048] The utility model further provides a kind of manufacturing method of structural coloration functional film, the flow schematic diagram of one specific embodiment as shown in Figure 3 It is called specific embodiment two, including:

[0049] S101: nano structural coloration particle 12, resin 11 and diluent are mixed, and structural coloration coating liquid is obtained.

[0050] S102: the structural coloration coating liquid is coated on substrate.

[0051] S103: the substrate coated with the structural coloration coating liquid is heat treated, and structural coloration functional film including structural coloration layer 10 is obtained;The structural coloration functional film is the film layer with ductility.

[0052] It should be noted that the substrate in this step can be the internal structure of the structural coloration functional film, and is retained after the heat treatment step, such as the substrate can be the base color layer 20, of course, the substrate can not be part of the structural coloration functional film, and the structural coloration layer 10 can be removed from the substrate after completing heat treatment.

[0053] The manufacturing method of structural coloration functional film in the specific embodiment corresponds to the structural coloration functional film in the foregoing, and the technical details are referred to the foregoing, and the utility model will not be repeated here.

[0054] Preferably, the nano structural coloration particle 12, resin 11 and diluent are mixed to obtain the structural coloration coating liquid, including:

[0055] Nano structural coloration particle 12, resin 11, additive and diluent are mixed to obtain structural coloration coating liquid;The additive includes at least one of plasticizer, heat stabilizer, light absorber, light stabilizer, leveling agent, dispersing agent, tackiness and viscosity reducing additive.

[0056] In the preferred embodiment, the above-mentioned auxiliary agent is mixed with the diluent together with the nanostructured color-producing particles 12 and the resin 11 to achieve better mixing effect. The type of auxiliary agent can be selected according to actual conditions.

[0057] As a preferred embodiment, the mixing of the nanostructured color-producing particles 12, the resin 11 and the diluent to obtain the structural color-producing coating solution includes:

[0058] A1: mixing and dispersing the nanostructured color-producing particles 12 with a first diluent to obtain a first mixture; the first diluent is a polar diluent.

[0059] The first diluent includes at least one of alkyl alcohol, alkyl ketone, water, DMF (N,N-dimethylformamide), DMAc (N,N-dimethylacetamide), NMP (N-methyl pyrrolidone), THF (tetrahydrofuran).

[0060] The nanostructured color-producing particles 12 have better compatibility with the polar diluent, and the nanostructured color-producing particles 12 can achieve better dispersibility after being mixed with the polar diluent, i.e., more uniform dispersion.

[0061] A2: mixing and dispersing the resin 11 with a second diluent to obtain a second mixture.

[0062] The second diluent includes at least one of alkyl ester, alkyl-substituted benzene, alkyl ketone, and organic ether.

[0063] A3: mixing and dispersing the first mixture with the second mixture to obtain a structural color-producing coating solution.

[0064] In the preferred embodiment, the nanostructured color-producing particles 12 are not directly mixed with the resin 11 and the diluent, but a separate dispersion of the nanostructured particles 12 is first prepared. The purpose is to disperse the nanostructured particles in a uniform and non-aggregated state in the solution, and then disperse them into the resin 11 coating solution, which is beneficial to the formation of a uniform and non-aggregated dispersion state of the nanospheres in the overall resin 11 coating solution.

[0065] Further, before mixing the nanostructured color-producing particles 12, the resin 11 and the diluent to obtain the structural color-producing coating solution, it further includes:

[0066] An organic group covering layer is provided on the surface of the nanostructured color-producing particles 12 through chemical coupling agent modification and / or adsorption modification and / or self-assembly modification.

[0067] In the preferred embodiment, the organic group covering layer is arranged on the surface of the nanostructured color-producing particles 12 by at least one of the three surface modification methods described above. By introducing new functional groups (such as alkyl, fluorine, amino, epoxy, etc.) on the surface, the chemical properties of the nanospheres are changed, and the compatibility between the nanospheres and the resin 11 is improved, thereby improving the dispersion performance of the nanospheres in the coating liquid. Further, it is preferred that the organic group covering layer is arranged by chemical coupling agent modification. The chemical coupling agent modification is achieved by the reaction of silane coupling agent with -OH and -SH on the surface of the nanospheres to form covalent bonds or hydrogen bonds, thereby introducing new functional groups on the surface. The chemical coupling agent modification is easy to operate, and the number of functional groups connected to the surface of the nanostructured color-producing particles 12 can be controlled by controlling the amount of coupling agent added.

[0068] As another preferred embodiment, before mixing the nanostructured color-producing particles 12, the resin 11, and the diluent to obtain the structural color-producing coating liquid, the following steps are further included:

[0069] B1: calculating the volume ratio of the nanostructured color-producing particles 12 to the resin 11 when the ratio of the spacing of the nanostructured color-producing particles 12 to the particle size of the nanostructured color-producing particles 12 is a first predetermined value; the product of the first predetermined value and the target elongation of the structural color-producing functional film does not exceed 1.

[0070] B2: determining the mass ratio of the nanostructured color-producing particles 12 to the resin 11 according to the density of the nanostructured color-producing particles 12, the density of the resin 11, and the volume ratio.

[0071] Since the target volume ratio is known, and the density of the nanostructured color-producing particles 12 and the density of the resin 11 are also known, the mass ratio of the nanostructured color-producing particles 12 to the resin 11 at the volume ratio can be calculated.

[0072] Correspondingly, the mixing of the nanostructured color-producing particles 12, the resin 11, and the diluent to obtain the structural color-producing coating liquid includes:

[0073] B3: mixing the diluent, the nanostructured color-producing particles 12 meeting the mass ratio, and the resin 11 to obtain the structural color-producing coating liquid.

[0074] From the foregoing description of the structural color functional film, the first preset value corresponds to the target elongation rate, in other words, according to the limitation given in this step, even if the structural color functional film is stretched to the target elongation rate, the spacing between adjacent nano-structured color particles 12 will not exceed the particle size of the structural color particles. The target elongation rate is calculated by the volume and density, and then the raw materials in production are adjusted according to the mass ratio, which can greatly simplify the preparation process and improve the production efficiency.

[0075] Specifically, the volume fraction of the nano-structured color particles 12 in the structural color functional film can be calculated, that is, the ratio of the volume of the nano-structured color particles 12 to the volume of the cube formed by the particle size of the nano-structured color particles 12 + the spacing between the nano-structured color particles 12; Specifically, the maximum volume fraction is achieved when the spacing between the nano-structured color particles 12 is 0, and the minimum volume fraction is achieved when the spacing between the nano-spheres is equal to the diameter of the nano-spheres. Specifically, it can be estimated by the following formulas (1) to (3):

[0076] Φ = V ball / V cube ; (1)

[0077] V ball = 4πr 3 / 3; (2)

[0078] V cube = (2r + l) 3 ; (3)

[0079] Wherein Φ represents the volume fraction of the nano-structured color particles 12 in the structural color functional film; V ball represents the volume of the nano-structured color particles 12; V cube represents the volume of a single nano-structured color particle 12 in spatial distribution; r represents the radius of the nano-structured color particles 12; l represents the spacing between the nano-structured color particles 12; When l is 0, the volume fraction of the nano-structured color particles 12 in the structural color functional film reaches the maximum value; When l = 2r, the volume fraction of the nano-structured color particles 12 in the structural color functional film reaches the theoretical minimum value;

[0080] Further, the diluent is selected to have a mixed diluent with a boiling point gradient to control the evaporation speed of the diluent during the drying process of the coating liquid to obtain a dry paint film with uniform distribution of nanostructured color-developing particles 12; further, the drying temperature of the color-developing coating liquid in the preparation of the paint film is also designed in a gradient manner to further optimize the drying speed of the coating liquid to obtain a dry paint film with uniform distribution of nanostructured color-developing particles 12; the color-developing coating liquid has uniform three-dimensional spatial distribution of nanostructured color-developing particles 12 in the state of the coating liquid and the dry paint film formed after drying of the coating liquid, and therefore can exhibit uniform color and appearance in normal and stretched states.

[0081] The manufacturing method of the structural color-developing functional film provided by the utility model, through mixing nanostructured color-developing particles 12, resin 11 and diluent, obtains a structural color-developing coating liquid; the structural color-developing coating liquid is coated on a substrate; the substrate coated with the structural color-developing coating liquid is heat treated to obtain a structural color-developing functional film including a structural color-developing layer 10; the structural color-developing functional film is a film layer with ductility. The utility model disperses nanostructured color-developing particles 12 in a resin layer, guarantees that even if the structural color-developing functional film is stretched during subsequent use, the nanostructured color-developing particles 12 for color development can still be relatively uniformly and effectively distributed in the structural color-developing functional film to ensure that sufficient scattering intensity is obtained, thereby greatly improving the color development uniformity of the functional film and greatly improving the color difference problem of the structural color-developing functional film before and after stretching.

[0082] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other. For the device disclosed by the embodiment, since it corresponds to the method disclosed by the embodiment, the description is relatively simple, and the related parts can be referred to the method part.

[0083] The utility model discloses a kind of structural color-developing functional coating liquids, including diluent, nanostructured color-developing particles and resin. The structural color-developing functional coating liquid can also add corresponding functional additives according to actual demand, the aid includes at least one of plasticizer, heat stabilizer, light absorber, light stabilizer, leveling agent, dispersing agent, tackifying and viscosity-reducing aid, the utility model does not limit here. The structural color-developing functional coating liquid provided by the utility model can obtain the structural color-developing functional film in the foregoing text after processing, specific mode can refer to the manufacturing method of structural color-developing functional film in the foregoing text, the structural color-developing functional coating liquid in this specific embodiment can be considered as the structural color-developing coating liquid in the manufacturing method of the structural color-developing functional film, please refer to the foregoing text, the utility model does not repeat here.

[0084] The following gives several specific examples of manufacturing methods for the structural color-producing functional film,

[0085] Example 1, preparation of a structural color-producing PVC coating solution;

[0086] Nano cuprous oxide 50 g, isopropyl alcohol 100 g; the nano cuprous oxide and isopropyl alcohol are weighed according to the above ratio, then the nano cuprous oxide is added to the isopropyl alcohol, and ultrasonic mixing is uniformly obtained to obtain a first mixture solution;

[0087] PVC paste resin 100 g, plasticizer 40 g, heat stabilizer 5 g, light stabilizer 1.5 g, xylene 20 g, isopropyl acetate 30 g, first mixture 120 g; the above compositions except the first mixture are weighed according to the ratio, mixed and stirred at 200 r / min for 2 h, so as to be fully mixed, then the above first mixture is added according to the ratio, and then mixed and stirred at 200 r / min for 1 h, to obtain a nano structural color-producing coating solution.

[0088] Example 2, surface modification of a structural color-producing nanosphere;

[0089] Nano cuprous oxide 5 g, silane coupling agent (3-aminopropyl triethoxysilane) 1.48 g, toluene 50 mL, deionized water 3.5 mL; the silane coupling agent 3-aminopropyl triethoxysilane is added to toluene, mixed uniformly, and then deionized water is added to obtain a mixed solution; the nano cuprous oxide is dispersed into the above mixed solution during mechanical stirring, and stirring is continued for 5 h; suction filtration, water washing, and drying at 100℃ are performed; and the modified nano particles are obtained.

[0090] Example 3, preparation process of a color-changing functional film;

[0091] The PVC transparent layer 30 paint is uniformly coated on the substrate film, after baking in an oven at 80℃ for 2 min, the oven is gradiently heated to 200℃ and kept at 200℃ for 3 min, and then cooled, to obtain the coating of the transparent layer 30. The coating method can be selected from the group consisting of blade coating, roller coating, and spraying, and the specific coating method is not limited; the coating thickness is set according to different requirements.

[0092] The structural color-producing layer paint is uniformly coated on the surface of the above transparent layer 30, after baking in an oven at 80℃ for 2 min, the oven is gradiently heated to 200℃ and kept at 200℃ for 3 min, and then cooled, to obtain the structural color-producing layer containing the transparent layer. The coating method can be selected from the group consisting of blade coating, roller coating, and spraying, and the specific coating method is not limited; the coating thickness is set according to different requirements.

[0093] According to the need, the prepared white, black, color or special effect PVC base color paint is uniformly coated on the surface of the above structure color layer, and after 80℃ oven baking for 2min, the oven gradient is raised to 200℃ and kept at 200℃ for 3min, and then cooled, so that the base film containing the structure color functional film 20 is obtained. The white, black, color or special effect base color is selected according to different target color scheme and presentation effect; the coating method can be selected as scraping, rolling, spraying, and the specific coating method is not limited; the coating thickness is set according to different requirements.

[0094] Table 1 is the preparation data of the structure color functional film with different colors, which can be referred to.

[0095] Table 1

[0096] SEQ ID NO Color effect Nanomaterial type Nanoparticle size (nm) Nanoparticle concentration Transparent layer effect Transparent layer thickness (pm) Structural color layer thickness (pm) Base color layer Base color layer thickness (pm) 1 High gloss green [Cu2O] 210 13% High gloss transparent 20 20 Black 90 2 Matte green [Cu2O] 210 13% Matte transparent 20 20 Black 90 3 High gloss orange [Cu2O] 210 13% Red transparent 20 20 Black 90 4 Light green [Cu2O] 210 13% High gloss transparent 20 20 White 90 5 Cyan [Cu2O] 210 13% High gloss transparent 20 20 Blue 90 6 Metallic effect green [Cu2O] 210 13% High gloss transparent 20 20 Metallic black 90 7 High gloss blue ZnS 240 9% High gloss transparent 20 20 Black 90 8 High gloss red CeO2 350 9% High gloss transparent 20 20 Black 90 9 High gloss purple [Cu2O] 250 12% High gloss transparent 20 20 Black 90 10 High gloss purple ZnO 260 18% High gloss transparent 20 20 Black 90 11 High gloss orange [Cu2O] 270 13% High gloss transparent 20 20 Black 90 12 High gloss green ZnS 240 / 265=2 / 1 9% High gloss transparent 20 20 Black 90 13 High gloss green Modifying Cu2O 210 13% High gloss transparent 20 20 Black 90

[0097] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0098] The structure color functional film provided by the present application is described in detail above. In this paper, specific examples are applied to explain the principle and implementation mode of the present application. The above embodiment is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A structured chromogenic functional film, characterized by, The structural color-producing layer comprises nanostructured color-producing particles. The structural color-producing layer comprises a resin layer comprising nanostructured color-producing particles. The structural color-producing functional film is a film layer with ductility.

2. The structured chromogenic functional film according to claim 1, wherein When the structural color-producing functional film is stretched to a target elongation, the corresponding color difference value of the structural color-producing functional film is less than a preset tolerance color difference value.

3. The structured chromogenic functional film according to claim 2, wherein When the structural color-producing functional film is stretched to a target elongation, the spacing of the nanostructured color-producing particles in the structural color-producing layer does not exceed the particle size of the nanostructured color-producing particles.

4. The structured chromogenic functional film according to claim 1, wherein A base color layer is arranged below the structural color-producing layer.

5. The structured chromogenic functional film according to claim 1, wherein The nanostructured color-producing particles comprise an organic group covering layer.

6. The structured chromogenic functional film according to claim 1, wherein The resin layer comprises at least one of a polyvinyl chloride resin layer, a polyurethane resin layer, a polyacrylate resin layer, and a fluororesin layer.

7. The structured chromogenic functional film according to claim 1, wherein The particle size of the nanostructured color-producing particles ranges from 100 nm to 700 nm, inclusive; and the particle size distribution index of the nanostructured color-producing particles is not less than 95%.

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