A flaky photonic pigment, a preparation method and application thereof

Abstract

This invention discloses a sheet-like photonic pigment, its preparation method, and its application, comprising the following steps: mixing a SiO2 nanosphere dispersion with a polymerizable monomer and a charge promoter, evaporating and concentrating the mixture to self-assemble into a liquid photonic crystal; mixing the liquid photonic crystal with a photoinitiator and a crosslinking agent to obtain a photocurable, breakable liquid photonic crystal; confining the liquid photonic crystal between two sheets and photocuring it to form a photonic crystal film; and then breaking the photonic crystal film under external force to obtain a 150-200 μm micron-sized sheet-like photonic pigment. This invention uses silica nanospheres as the basic unit and a polymerizable monomer as the continuous phase. Under the action of a charge promoter, the electrostatic repulsion between the nanospheres is promoted, facilitating the spontaneous arrangement and assembly of the nanospheres in the non-polar polymerizable monomer to form a polymerizable liquid photonic crystal. The introduction of a crosslinking agent improves the brittleness of the photonic crystal structure film, directly pulverizing it to form a micron-sized sheet-like photonic pigment.

Description

Technical Field

[0001] This invention relates to the field of pigment preparation technology, specifically to a flake-shaped photonic pigment and its preparation method and application. Background Technology

[0002] With the continuous improvement of living standards, textiles, as one of the most common items in daily life, have become an entry point for people seeking uniqueness. Besides textile design, color is also a crucial factor. The most common coloring method used by humans is to apply chemical colorants such as dyes or pigments to items; this type of color is called chemical color. However, with the increasing awareness of environmental protection, the limitations of chemical colors are becoming more and more apparent. Inspired by nature, people have recognized another type of color—physical color (structural color). Photonic crystal structural color is an excellent example. Photonic crystals are crystalline materials formed by two or more media with different dielectric constants (refractive indices) arranged in a certain periodic pattern in space. They are usually constructed using nanospheres as structural units through colloidal self-assembly. In addition to the excellent color effects of chemical colors, this type of color also significantly reduces the discharge of dyeing and printing wastewater.

[0003] Current research on photonic crystal structured color textiles mostly involves directly assembling long-range ordered photonic crystal structured color coatings on the surface of various substrates. Although this method makes large-scale production of structured color textiles possible, the structural color coating and textiles are mostly bonded by weak forces such as van der Waals and hydrogen bonding. Furthermore, the ordered structure between nanospheres is also formed by these forces. Therefore, directly assembling long-range ordered photonic crystal structured color films on the surface of various substrates results in poor stability and makes it difficult to perform various complex patterning.

[0004] Besides directly assembling long-range ordered photonic crystal structure color films on substrates, as mentioned above, coloring can also be achieved using photonic crystal structure color pigments. Most research on these pigments focuses on constructing water-in-oil or oil-in-water pigments. However, these methods often suffer from low assembly efficiency (see patent CN119425548A) and poor crystallization. Furthermore, spherical photonic crystal structures have low structural orientation, resulting in lower color saturation and angle dependence of their structural colors (see patent CN110467783A). Currently, the preparation of publicly available sheet-like photonic pigments involves complex processes (see patent CN114164483A), high energy consumption (see patent CN118388995A), and the addition of traditional chemical pigments, which imposes a certain burden on the environment (see patent CN106609050A).

[0005] Therefore, developing structural color pigments that conform to green and sustainable development, have excellent optical properties, and are suitable for large-area coloring and pattern customization of textiles is an issue that needs to be addressed. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a sheet-like photonic pigment, its preparation method, and its application. It uses silica nanospheres as the basic unit and a high-boiling-point nonpolar polymerizable monomer as the continuous phase. Under the action of a charge promoter, electrostatic repulsion between the nanospheres is promoted, thereby facilitating the spontaneous arrangement and assembly of the nanospheres within the nonpolar polymerizable monomer to form a polymerizable liquid photonic crystal. By introducing a crosslinking agent into the system, the brittleness of the formed photonic crystal structure color film is effectively improved, allowing for direct pulverization to form a micron-sized sheet-like photonic crystal structure color pigment.

[0007] To address the aforementioned technical problems, the first aspect of this invention provides a method for preparing a flake-like photonic pigment, comprising the following steps:

[0008] S1. Mix the SiO2 nanosphere dispersion with polymerizable monomers and charge promoters to obtain a multi-component colloidal mixture;

[0009] S2. The multi-component colloidal mixture is evaporated and concentrated to remove the solvent in the mixture and self-assembled to obtain a liquid photonic crystal.

[0010] S3. The liquid photonic crystal is mixed with a photoinitiator and a crosslinking agent to obtain a photocurable, breakable liquid photonic crystal; wherein the crosslinking agent is selected from divinylbenzene, trivinylbenzene, and triallyl isocyanurate.

[0011] S4. The liquid photonic crystal is confined between two sheets and photocured to form a photonic crystal film. Then, the photonic crystal film is broken under external force to obtain micron-sized sheet-like photonic pigments of 150-200 μm.

[0012] This invention uses silica nanospheres as basic units, and prepares liquid photonic crystals by transferring silica nanospheres into a continuous phase composed of charge promoters and polymerizable monomers through an evaporation self-assembly method. Subsequently, photoinitiators and crosslinking agents are introduced into the system, and after confined assembly stabilization, photonic crystal structural color films are prepared by UV curing. Micron-sized sheet-like photonic pigments are then prepared under external force. This method is characterized by its simplicity, low cost, and ability to produce large quantities. Furthermore, the prepared sheet-like photonic pigments exhibit vibrant and bright colors and can be applied in various scenarios according to specific needs.

[0013] Furthermore, the solvent for the SiO2 nanosphere dispersion is ethanol.

[0014] Furthermore, the SiO2 nanospheres have a diameter of 180-260 nm and a PDI < 0.08.

[0015] Furthermore, the polymerizable monomer is selected from one or more of 2-phenylethyl acrylate, diethylene glycol monoethyl ether acrylate, and isooctyl acrylate.

[0016] Furthermore, the charge promoter is selected from one or more of propylene carbonate, ethylene carbonate, and dimethyl carbonate.

[0017] Furthermore, the photoinitiator is selected from one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and ethyl 2,4,6-trimethylbenzoylphenylphosphonate.

[0018] Furthermore, the volume fractions of each component in the multi-component colloidal mixture are as follows: 20-40 parts SiO2 nanospheres, 50-64 parts polymerizable monomers, 6-16 parts charge promoter; 1-3% of the mass of the polymerizable monomers by the photoinitiator, and 1-4% of the mass of the polymerizable monomers by the crosslinking agent.

[0019] Furthermore, the evaporation and concentration temperature is 60-70°C.

[0020] Furthermore, the photocuring conditions are: ultraviolet light power of 80-100 mW / cm². 2 The time is 10-30 seconds.

[0021] Furthermore, the gap between the two sheets is 30-40 μm.

[0022] The second aspect of the present invention provides a flake-shaped photonic pigment prepared by the preparation method described in the first aspect.

[0023] The third aspect of the present invention provides the application of the flake-shaped photonic pigment described in the first aspect in dyeing pastes.

[0024] The beneficial effects of this invention are:

[0025] This invention uses silica nanospheres as basic units and prepares liquid photonic crystals by transferring silica nanospheres into a continuous phase composed of charge promoters and polymerizable monomers through an evaporation self-assembly method. Using silica nanospheres as assembly intermediates, photopolymerization is combined to embed the photonic crystal structure formed by the arrangement of nanospheres in situ within a polymer matrix. When this photonic pigment is subsequently used in combination with resins and adhesives, the resins and adhesives cannot penetrate into the interior of the color-generating structure of the photonic crystal, and the photonic pigment can still maintain high color saturation.

[0026] This invention introduces a crosslinking agent into a polymeric liquid photonic crystal system, which can effectively enhance the degree of crosslinking of the polymeric system, thereby enhancing the brittleness of the resulting photonic crystal structure color film. The structure color photonic film can be pulverized under a small external force to obtain micron-sized sheet-like photonic pigments.

[0027] The method of this invention is characterized by simple operation, low cost, and mass production capability. At the same time, the prepared flake photonic pigments are bright and vivid in color and can be used in various scenarios according to needs. Attached Figure Description

[0028] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a macroscopic photograph of the liquid photonic crystal obtained in Example 1 of the present invention;

[0030] Figure 2 This is a photograph of the photonic crystal film obtained in Example 1 of the present invention;

[0031] Figure 3 This is a photograph of the sheet-like photonic pigment obtained in Example 1 of the present invention;

[0032] Figure 4 This is a macroscopic photograph of the liquid photonic crystal obtained in Example 2 of the present invention;

[0033] Figure 5 This is a photograph of the sheet-like photonic pigment obtained in Example 2 of the present invention;

[0034] Figure 6 This is a macroscopic photograph of the liquid photonic crystal obtained in Example 3 of the present invention;

[0035] Figure 7 This is a photograph of the photonic crystal film obtained in Example 3 of the present invention;

[0036] Figure 8 This is a photograph of the sheet-like photonic pigment obtained in Example 3 of the present invention;

[0037] Figure 9 This is a photograph of the sheet-like photonic pigment obtained in Example 4 of the present invention;

[0038] Figure 10 These are the reflection spectra of the flake-shaped photonic pigments obtained in Examples 1-4 of the present invention;

[0039] Figure 11These are optical photographs of the flake-shaped photonic pigments obtained in Examples 1-4 of the present invention, wherein i is Example 4, ii is Example 3, iii is Example 2, and iv is Example 1;

[0040] Figure 12 The mechanical tests of the photonic crystal films obtained in Examples 1-4 of this invention are as follows;

[0041] Figure 13 These are application examples of the present invention, specifically photos of photon pigments, where I is nail polish application and II is pattern creation.

[0042] Figure 14 Example 2 of the application of this invention is a photograph of a pattern created using photonic pigments that changes with angle.

[0043] Figure 15 This is a macroscopic photograph of the silica obtained in Comparative Example 1 assembled with polymerizable monomers;

[0044] Figure 16 This is a photograph of the photonic crystal film obtained in Comparative Example 2;

[0045] Figure 17 The mechanical test curve of the photonic crystal film obtained in Comparative Example 3 is shown.

[0046] Figure 18 The images and reflection spectra of the silica interface self-assembly, its corresponding photonic pigment, and its mixture with resin are shown in Comparative Example 4. Detailed Implementation

[0047] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] This embodiment relates to a method for preparing a flake-like photonic pigment, comprising the following steps:

[0049] S1. Mix the SiO2 nanosphere dispersion with polymerizable monomers and charge promoters to obtain a multi-component colloidal mixture;

[0050] S2. The multi-component colloidal mixture is evaporated and concentrated to remove the solvent in the mixture and self-assembled to obtain a liquid photonic crystal.

[0051] S3. The liquid photonic crystal is mixed with a photoinitiator and a crosslinking agent to obtain a photocurable, breakable liquid photonic crystal; wherein the crosslinking agent is selected from divinylbenzene, trivinylbenzene, and triallyl isocyanurate.

[0052] S4. The liquid photonic crystal is confined between two sheets and photocured to form a photonic crystal film. Then, the photonic crystal film is broken under external force to obtain micron-sized sheet-like photonic pigments of 150-200 μm.

[0053] This embodiment uses silica nanospheres as basic units, and prepares liquid photonic crystals by transferring silica nanospheres into a continuous phase composed of charge promoters and polymerizable monomers through an evaporation self-assembly method. Subsequently, photoinitiators and crosslinking agents are introduced into the system, and after confined assembly stabilization, photonic crystal structural color films are prepared by UV curing. Micron-sized sheet-like photonic pigments are then prepared under external force. This method is characterized by its simplicity, low cost, and ability to produce large quantities. Furthermore, the prepared sheet-like photonic pigments exhibit vibrant and bright colors and can be applied in various scenarios according to requirements.

[0054] In a preferred embodiment, the solvent of the SiO2 nanosphere dispersion is ethanol, the diameter of the SiO2 nanospheres is 180-260 nm, and the PDI is <0.08.

[0055] In a preferred embodiment, the polymerizable monomer is selected from one or more of 2-phenylethyl acrylate, diethylene glycol monoethyl ether acrylate, and isooctyl acrylate; the charge promoter is selected from one or more of propylene carbonate, ethylene carbonate, and dimethyl carbonate; and the photoinitiator is selected from one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and ethyl 2,4,6-trimethylbenzoylphenylphosphonate.

[0056] In a preferred embodiment, the volume fractions of each component in the multi-component colloidal mixture are as follows: 20-40 parts SiO2 nanospheres, 50-64 parts polymerizable monomers, 6-16 parts charge promoter; 1-3% of the mass of the polymerizable monomers by the photoinitiator, and 1-4% of the mass of the polymerizable monomers by the crosslinking agent.

[0057] In a preferred embodiment, the evaporation and concentration temperature is 60-70℃; the photocuring conditions are: ultraviolet light power of 80-100 mW / cm². 2 The time is 10-30 s; the gap between the two sheets is 30-40 μm.

[0058] Another embodiment of the present invention provides a flake-shaped photonic pigment prepared by the preparation method described in the above embodiments.

[0059] Another embodiment of the present invention provides the application of the flake photonic pigment described in the above embodiments in dyeing pastes.

[0060] Example 1

[0061] This embodiment provides a method for preparing a flake-shaped photonic pigment, including the following steps:

[0062] (1) Take 1 mL of an ethanol dispersion of silica (particle size 250 nm, PDI = 0.05), and add the polymerizable monomer 2-phenylethyl acrylate and the charge promoter propylene carbonate to it. The volumes of each component are as follows: silica 0.1 cm³ 3 148 μL of 2-phenylethyl acrylate and 38 μL of propylene carbonate were ultrasonically mixed and concentrated at 70 °C for 6 h to obtain a red liquid photonic crystal (see results). Figure 1 ).

[0063] (2) Add 1% by mass of the polymerizable monomer photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1% by mass of the polymerizable monomer crosslinking agent divinylbenzene to the liquid photonic crystal and mix in an ultrasonic bath at 100 kW for 10 min to obtain a polymerizable liquid photonic crystal.

[0064] (3) The polymerizable liquid photonic crystal described above was fixed between two glass slides (35 μm apart) with PET film attached using a confined assembly method, at 100 mW / cm 2 Curing under a UV curing lamp for 20 seconds solidified the liquid photonic crystal into a photonic crystal film (results are shown below). Figure 2 Under external force, the photonic crystal film was pulverized into 150 μm - 200 μm flake-like photonic pigments (results as follows). Figure 3 ).

[0065] Example 2

[0066] This embodiment provides a method for preparing a flake-shaped photonic pigment, including the following steps:

[0067] (1) Take 1 mL of an ethanol dispersion of silica (particle size 230 nm, PDI = 0.04), and add the polymerizable monomer diethylene glycol monoethyl ether acrylate and the charge promoter propylene carbonate to it. The mass of each component is as follows: silica 0.1 cm 3 148 μL of diethylene glycol monoethyl ether acrylate and 38 μL of propylene carbonate were ultrasonically mixed and concentrated at 70 °C for 6 h to obtain a yellow liquid photonic crystal (see results). Figure 4 ).

[0068] (2) Add 2% by mass of the polymerizable monomer photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 2% by mass of the polymerizable monomer crosslinking agent trivinylbenzene to the liquid photonic crystal, and mix in 100 kW of ultrasound for 10 min to obtain the polymerizable liquid photonic crystal.

[0069] (3) The polymerizable liquid photonic crystal described above was fixed between two glass slides (35 μm apart) with PET film attached using a confined assembly method, at 100 mW / cm 2 Curing under a UV curing lamp for 15 seconds solidified the liquid photonic crystal into a photonic crystal film. Under external force, the photonic crystal film was then pulverized into 150 μm-200 μm flake-like photonic pigments (results are shown below). Figure 5 ).

[0070] Example 3

[0071] This embodiment provides a method for preparing a flake-shaped photonic pigment, including the following steps:

[0072] (1) Take 1 mL of an ethanol dispersion of silica (particle size 200 nm, PDI = 0.06), and add the polymerizable monomer isooctyl acrylate and the charge promoter ethylene carbonate to it. The volumes of each component are as follows: silica 0.1 cm³ 3 148 μL of isooctyl acrylate and 38 μL of ethylene carbonate were ultrasonically mixed and concentrated at 70 °C for 8 h to obtain a green liquid photonic crystal (see results). Figure 6 ).

[0073] (2) Add 3% by mass of the polymerizable monomer photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 3% by mass of the polymerizable monomer crosslinking agent trivinylbenzene to the liquid photonic crystal and mix in an ultrasonic bath at 100 kW for 10 min to obtain a polymerizable liquid photonic crystal.

[0074] (3) The polymerizable liquid photonic crystal described above was fixed between two glass slides (35 μm apart) with PET film attached using a confined assembly method, at 100 mW / cm 2 Curing under a UV curing lamp for 10 seconds solidified the liquid photonic crystal into a photonic crystal film (results are shown below). Figure 7 Under external force, the photonic crystal film was pulverized into 150 μm - 200 μm flake-like photonic pigments (results as follows). Figure 8 ).

[0075] Example 4

[0076] This embodiment provides a method for preparing a flake-shaped photonic pigment, including the following steps:

[0077] (1) Take 1 mL of an ethanol dispersion of silica (particle size 180 nm, PDI = 0.02), and add the polymerizable monomer 2-phenylethyl acrylate and the charge promoter dimethyl carbonate to it. The volumes of each component are as follows: silica 0.1 cm³ 3 148 μL of 2-phenylethyl acrylate and 38 μL of dimethyl carbonate were ultrasonically mixed and concentrated at 60 °C for 8 h to obtain a blue liquid photonic crystal.

[0078] (2) Add 3% by mass of the polymerizable monomer photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 4% by mass of the polymerizable monomer crosslinking agent trivinylbenzene to the liquid photonic crystal, and mix in an ultrasonic bath at 100 kW for 10 min to obtain a polymerizable liquid photonic crystal.

[0079] (3) The polymerizable liquid photonic crystal described above was fixed between two glass slides (35 μm apart) with PET film attached using a confined assembly method, at 100 mW / cm 2 Curing under a UV curing lamp for 10 seconds solidified the liquid photonic crystal into a photonic crystal film. Under external force, the photonic crystal film was then pulverized into 150 μm-200 μm flake-like photonic pigments (results are shown below). Figure 9 ).

[0080] Figure 10 The reflection spectra of the flake-like photonic pigments obtained in Examples 1-4; Figure 11 Optical photographs of the flake-like photonic pigments obtained in Examples 1-4, wherein Figure 11 Example 4 corresponds to section i. Figure 11 Example 3 is shown in section ii. Figure 11 Example 2 is shown in section iii. Figure 11 Example 1 is shown in section iv. Figure 12 The mechanical tests of the photonic crystal films obtained in Examples 1-4 show that as the crosslinking agent increases, the force required for fracture decreases, indicating an increase in brittleness.

[0081] Application Example 1

[0082] The flake-like photonic pigments obtained in Examples 1-3 were respectively mixed with UV-curable monomers to obtain photonic pigments that can be used in UV-curable nail polishes, such as... Figure 13 As shown in Figure I. The flake-like photonic pigments obtained in Examples 1-4 were respectively mixed with UV-curable monomers and used as photonic pastes to create patterns. The results are shown in Figure I. Figure 13 Middle II.

[0083] Application Example 2

[0084] Using the flake-like photonic pigments of several colors from Examples 1-4 as photonic pastes to create patterns exhibits angle dependence while maintaining high color saturation, as shown in the following results. Figure 14 As shown, this is because the photonic crystal film constructed in this patent is a three-dimensional photonic crystal. The photonic band gap of a three-dimensional photonic crystal varies with direction. According to Bragg's law of diffraction, changing the angle of the incident light will change the optical path difference, causing a specific wavelength to be reflected at different angles, resulting in an angle-dependent structure.

[0085] Comparative Example 1

[0086] The difference between this comparative example and Example 1 is that no charge promoter is added in step (1), while other steps and parameters remain unchanged. The resulting liquid photonic crystal image is shown below. Figure 15 As shown, it is evident that liquid photonic crystals cannot be formed without charge promoters.

[0087] Comparative Example 2

[0088] The difference between this comparative example and Example 1 is that no polymerizable monomer is added in step (1), while other steps and parameters remain unchanged. The resulting photonic crystal film photograph is shown below. Figure 16 As shown, it can be seen that without polymerizable monomers, the film cannot be cured.

[0089] Comparative Example 3

[0090] The difference between this comparative example and Example 2 is that no crosslinking agent is added in step (2), while other steps and parameters remain unchanged. The mechanical properties of the obtained photonic crystal film are tested as follows: Figure 17 As shown, it can be seen that without the addition of a crosslinking agent, the force required to break the photonic crystal film is much greater than that in Example 2 with the addition of a crosslinking agent.

[0091] Comparative Example 4

[0092] This comparative example relates to a method for preparing a photonic crystal structured color pigment, comprising the following steps:

[0093] (1) Take 1 mL of 10 wt% silica ethanol dispersion and spread it on a glass slide. Allow it to self-assemble at 60°C. Repeat the above steps 2-3 times. After complete deposition, collect the obtained photon pigment and mix it with the resin.

[0094] Images of the obtained interface self-assembled products and photonic crystal powder, along with their reflectance spectra, are shown below. Figure 18 It can be seen that the photonic crystal assembled in the air has low color saturation, and the color disappears when it is mixed with resin as a sheet pigment.

[0095] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A method for preparing a flake-like photonic pigment, characterized in that, Includes the following steps: S1. Mix the SiO2 nanosphere dispersion with polymerizable monomers and charge promoters to obtain a multi-component colloidal mixture; S2. The multi-component colloidal mixture is evaporated, concentrated, and self-assembled to obtain a liquid photonic crystal. S3. The liquid photonic crystal is mixed with a photoinitiator and a crosslinking agent to obtain a photocurable, breakable liquid photonic crystal; wherein the crosslinking agent is selected from divinylbenzene, trivinylbenzene, and triallyl isocyanurate. S4. The liquid photonic crystal is confined between two sheets and photocured to form a photonic crystal film. Then, the photonic crystal film is broken under external force to obtain micron-sized sheet-like photonic pigments of 150-200 μm.

2. The method for preparing the flake-like photonic pigment as described in claim 1, characterized in that, The SiO2 nanospheres have a diameter of 180-260 nm and a PDI < 0.

08.

3. The method for preparing the flake-like photonic pigment as described in claim 1, characterized in that, The polymerizable monomer is selected from one or more of 2-phenylethyl acrylate, diethylene glycol monoethyl ether acrylate, and isooctyl acrylate.

4. The method for preparing the flake-like photonic pigment as described in claim 1, characterized in that, The charge promoter is selected from one or more of propylene carbonate, ethylene carbonate, and dimethyl carbonate.

5. The method for preparing the flake-like photonic pigment as described in claim 1, characterized in that, The photoinitiator is selected from one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and ethyl 2,4,6-trimethylbenzoylphenylphosphonate.

6. The method for preparing the flake-like photonic pigment as described in claim 1, characterized in that, The volume fractions of each component in the multi-component colloidal mixture are as follows: 20-40 parts SiO2 nanospheres, 50-64 parts polymerizable monomers, 6-16 parts charge promoter; 1-3% of the mass of the polymerizable monomers by photoinitiator, and 1-4% of the mass of the polymerizable monomers by crosslinking agent.

7. The method for preparing the flake-like photonic pigment as described in claim 1, characterized in that, The evaporation and concentration temperature is 60-70℃.

8. The method for preparing the flake-like photonic pigment as described in claim 1, characterized in that, The photocuring conditions are: ultraviolet light power of 80-100 mW / cm². 2 The time is 10-30 seconds.

9. A flake-shaped photonic pigment prepared by the preparation method according to any one of claims 1-8.

10. The application of the flake-shaped photonic pigment of claim 9 in dyeing paste.

Images