Dye bath composition for photonic crystal pigment and coloring method thereof

Abstract

The invention belongs to the technical field of materials, and particularly relates to a dye bath composition for a photonic crystal pigment and a coloring method of the dye bath composition. The dye bath composition for the photonic crystal pigment comprises water, an organic solvent, a surfactant and a solvent dye. The dye bath composition can permeate into a gap layer of the photonic crystal pigment, so that secondary coloring of the photonic crystal pigment is realized, and the photonic crystal pigment is endowed with stronger covering power and richer multi-angle colors. The invention also provides a secondary coloring method for the photonic crystal pigment by using the dye bath composition for the photonic crystal pigment, and the coloring method has the advantages of high coloring efficiency, uniform coloring and simple operation, and can realize rapid and large-batch coloring treatment in industry.

Description

Technical Field

[0001] The invention belongs to the technical field of materials, and in particular relates to a dye bath composition for photonic crystal pigments and a coloring method thereof. Background Art

[0002] The colors of substances are mainly divided into chemical colors and structural colors. Chemical colors are produced by pigments in substances through chromophores, while structural colors are achieved through internal microstructures. Structural colors are ubiquitous in nature, such as butterfly wings and peacock feathers. When the internal microstructure of a substance is disordered, light is mainly scattered; when the internal microstructure of a substance is orderly arranged, diffraction or interference (Bragg diffraction) mainly occurs, forming structural colors. Through further design, a refractive index difference is formed in the microstructure, and structural colors that vary with angle can be obtained, which are so-called rainbow colors (colorful).

[0003] The rainbow colors produced by the Bragg diffraction principle are used to make colorful films, which have many advantages such as bright colors and environmental friendliness, and are widely used in the fields of decoration and packaging. The technologies that can be used to make colorful films include multi-layer coating, multi-layer co-extrusion, liquid crystal polymerization, photonic crystals, nanoimprinting, laser, etc.

[0004] Among them, photonic crystals are formed by three-dimensional orderly arrangement of microspheres. When light is incident on photonic crystals, due to the periodic structure of photonic crystals, the light diffracts or interferes, thereby reflecting light of a specific wavelength, which is Bragg reflection. At the same time, as the size of the microspheres and the distance of the lattice change, photonic crystals can reflect light from ultraviolet to infrared bands. When the reflected wavelength is within the visible light range, it can produce dazzling colors as a structural color; as the refractive index of the microsphere material and the number of layers of the periodic structure change, the reflectivity changes. The microspheres are processed onto a film and crystallized through self-assembly, bending-induced oscillation shear and other technologies to form a colorful film (photonic crystal film).

[0005] Adding oligomers and monomers to the microsphere emulsion to fill the gaps between the microspheres, and adding a photoinitiator to initiate the cross-linking of the oligomers and monomers, the crystallization arrangement of the microspheres is fixed, thereby obtaining a photonic crystal film (such as Chinese invention patent CN111363393B). After crushing, photonic crystal pigments can be obtained.

[0006] Photonic crystal pigments, due to their microsphere material and crystallized arrangement, can form a narrow and deep reflection spectrum curve, thus having high saturation and high transmittance that ordinary pigments or dyes do not have. Correspondingly, high transmittance also brings the disadvantages of low reflectivity and low hiding power. Therefore, in the fields of inks, coatings, plastics, etc., if photonic crystal pigments are simply mixed with organic pigments and dyes with strong hiding power, the color of the photonic crystal pigment will often be covered by the pigment, thus failing to fully present its colorful appearance. Summary of the invention

[0007] In view of the shortcomings of the prior art, the first object of the present invention is to provide a dye bath composition for photonic crystal pigments. The pigment in the dye bath composition can penetrate into the interstitial layer of the photonic crystal pigment in the presence of water, solvent and surfactant, forming a more complex superposition of photonic crystal, Bragg diffraction and dye absorption color, thereby achieving secondary coloring of the photonic crystal pigment, giving the photonic crystal pigment stronger covering power and richer multi-angle colors.

[0008] The second object of the present invention is to provide a method for coloring a dye bath composition for photonic crystal pigments, which has the advantages of high coloring efficiency, uniform coloring and simple operation.

[0009] To achieve the first objective of the present invention, the present invention adopts the following technical solutions:

[0010] A dye bath composition for photonic crystal pigment comprises water, an organic solvent, a surfactant and a solvent dye.

[0011] Preferably, the dye bath composition for photonic crystal pigments comprises the following components in parts by mass: 20-80 parts of water, 20-80 parts of organic solvent, 0.1-1 part of surfactant and 0.1-5 parts of solvent dye.

[0012] Preferably, the surfactant includes at least one of anionic surfactant, cationic surfactant and nonionic surfactant.

[0013] More preferably, the surfactant includes at least one of an alkylphenol polyoxyethylene ether nonionic surfactant and a fluorocarbon nonionic surfactant.

[0014] More preferably, the surfactant is an alkylphenol polyoxyethylene ether nonionic surfactant, including nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, dodecyl polyoxyethylene ether, dinonylphenol polyoxyethylene ether and the like.

[0015] Most preferably, the surfactant is polyethylene glycol octylphenyl ether.

[0016] Preferably, the mass ratio of the solvent dye to the surfactant is greater than 1:1.

[0017] Preferably, the organic solvent includes at least one of ethanol, ethylene glycol, propylene glycol, glycerol, ethylene glycol methyl ether, propylene glycol methyl ether, ethylene glycol butyl ether, dimethylformamide, dimethylacetamide, and N-methylpyrrolidone.

[0018] Preferably, the solvent dye includes at least one of metal complex dyes, anthraquinone dyes, azo dyes, phthalocyanine dyes, quinoline dyes, pyrene dyes, cyanine dyes, indigo dyes, nitroso dyes, nitro dyes, sulfur dyes, aromatic methane dyes, quinone imine dyes, hydroxycopper dyes and flavonoid dyes.

[0019] To achieve the second purpose of the present invention, the present invention provides a secondary coloring method for photonic crystal pigments (i.e., a coloring method using the above-mentioned dye bath composition for photonic crystal pigments), comprising the following steps: adding the photonic crystal pigment to the above-mentioned dye bath composition for photonic crystal pigments for coloring treatment, followed by filtering, washing and drying, thereby achieving secondary coloring treatment of the photonic crystal pigments.

[0020] Specifically, the above method comprises the following steps:

[0021] Step 1: Mixing and stirring water, an organic solvent, a surfactant and a solvent dye to dissolve, to prepare the dye bath composition for the photonic crystal pigment;

[0022] Step 2: raising the temperature of the prepared photonic crystal pigment dye bath composition to a certain temperature; under stirring conditions, placing the photonic crystal pigment into the heated dye bath composition for secondary coloring; and then filtering, washing and drying to obtain a secondary colored photonic crystal pigment.

[0023] Preferably, the temperature of the dye bath composition for photonic crystal pigment is controlled to 25-99° C. before adding the photonic crystal pigment.

[0024] Preferably, the photonic crystal pigment is added to the dye bath composition and subjected to coloring treatment for 20-30 minutes.

[0025] Preferably, the photonic crystal pigment is a composition of orderly arranged nano-microspheres with gaps filled by acrylic polymers. The photonic crystal pigment can be prepared by some disclosed technologies in the art, such as the method disclosed in Chinese patent application CN117534796A.

[0026] Further preferably, the nano-microspheres are selected from at least one of polymer microspheres, inorganic microspheres and polymer-inorganic composite microspheres; the polymer microspheres include at least one of polystyrene microspheres and core-shell structure polymer microspheres; the inorganic microspheres include at least one of silicon dioxide, titanium dioxide, ferrosoferric oxide and zinc sulfide;

[0027] The average particle size of the nano-microspheres is 100-400 nm, and the polydispersity index PDI is less than 0.15;

[0028] The acrylate polymer is polymerized by heat initiation or light initiation through at least one acrylate selected from (meth)acrylate monomers and (meth)acrylate oligomers.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] 1. The present invention provides a dye bath composition for photonic crystal pigments. The pigment in the dye bath composition can penetrate into the interstitial layer of the photonic crystal pigment in the presence of water, solvent and surfactant, forming a more complex superposition of photonic crystal, Bragg diffraction and dye absorption color, thereby realizing secondary coloring of the photonic crystal pigment, giving the photonic crystal pigment stronger covering power and richer multi-angle colors.

[0031] 2. The present invention also provides a method for secondary coloring of photonic crystal pigments using the dye bath composition for photonic crystal pigments. The coloring method has the advantages of high coloring efficiency, uniform coloring, and simple operation, and can achieve rapid and large-scale coloring processing in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a 500-fold microscope image of the black-green-blue photonic crystal pigment prepared in Example 1;

[0033] Figure 2 This is a 500-fold microscope image of the photonic crystal pigment prepared in Comparative Example 1;

[0034] Figure 3 This is a physical picture of the photonic crystal pigment with black, green and blue colors prepared in Example 1;

[0035] Figure 4 This is a physical picture of the photonic crystal pigment prepared in Comparative Example 1.

[0036] Figure 5 This is a physical picture of the photonic crystal pigment prepared in Comparative Example 2.

[0037] Figure 6 This is a physical picture of the photonic crystal pigment prepared in Comparative Example 3. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the examples and drawings, but the embodiments of the present invention are not limited thereto. The raw materials involved in the present invention can be purchased directly from the market. For process parameters not particularly noted, conventional techniques can be used.

[0039] The embodiment of the present invention provides a photonic crystal composition, which preferably includes the following components in parts by weight: 20-80 parts of water; 20-80 parts of organic solvent; 0.1-1 part of surfactant; and 0.1-5 parts of solvent dye.

[0040] The surfactant can be at least one of anionic surfactant, cationic surfactant and nonionic surfactant, preferably at least one of alkylphenol polyoxyethylene ether nonionic surfactant and fluorocarbon nonionic surfactant, more preferably alkylphenol polyoxyethylene ether nonionic surfactant, including nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, dodecyl polyoxyethylene ether, dinonylphenol polyoxyethylene ether, etc. The surfactant can make the dye penetrate into the interstitial layer of the photonic crystal pigment more effectively. It is found through experiments that the effect of nonionic surfactant is better. In the embodiment of the present invention, polyethylene glycol octyl phenyl ether is used as an example, but it is not limited to polyethylene glycol octyl phenyl ether to achieve the purpose of the present invention.

[0041] The mass fraction of the surfactant is 0.1-1 part, for example, in a specific embodiment, it can be 0.1 part, 0.2 part, 0.5 part, 1 part, etc. When the surfactant is used in the above amount range, it can better cooperate with the solvent dye to achieve secondary coloring of the photonic crystal pigment.

[0042] The organic solvent is preferably an organic solvent miscible with water. As examples, the present invention cites ethanol, ethylene glycol, propylene glycol, glycerol, ethylene glycol methyl ether, propylene glycol methyl ether, ethylene glycol butyl ether, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, etc. Other organic solvents commonly used in the art that are miscible with water can also achieve the purpose of the present invention and should also belong to the protection scope of the present invention. The ratio of organic solvent to water does not have a key influence on the effect of the dye bath composition. It is possible to select a combination of more water than organic solvent, more organic solvent than water, or an equivalent amount of the two.

[0043] The solvent dyes include metal complex dyes, anthraquinone dyes, azo dyes, phthalocyanine dyes, quinoline dyes, pyrene dyes, cyanine dyes, indigo dyes, nitroso dyes, nitro dyes, sulfur dyes, aromatic methane dyes, quinone imine dyes, hydroxycopper dyes, flavonoid dyes, etc., and the mass ratio of the solvent dyes to the surfactant is greater than 1:1 to ensure that the photonic crystal pigment can be better secondary colored.

[0044] An embodiment of the present invention also provides a method for secondary coloring of a photonic crystal pigment. Specifically, it is a method for secondary coloring of a photonic crystal pigment using the above-mentioned dye bath composition for photonic crystal pigments, comprising the following steps: adding the photonic crystal pigment to the above-mentioned dye bath composition for photonic crystal pigments for coloring treatment, and then filtering, washing and drying, thereby achieving secondary coloring treatment of the photonic crystal pigment.

[0045] Photonic crystal pigment is a physical color phenomenon produced by the interaction between natural light and the internal microstructure of a substance. It is different from traditional dyes and pigments, and its color comes from the micro-nano scale structure in the photonic crystal, so it is called structural color. Because photonic crystal pigment has high light transmittance, when photonic crystal pigment is mixed with organic pigment or dye for color adjustment, the color of photonic crystal pigment is easily covered, affecting the final appearance effect. The above-mentioned dye bath composition provided by the present invention can, at an appropriate temperature (room temperature or appropriate heating), allow solvent dyes to penetrate into the photonic crystal pigment gap layer, forming a more complex photonic crystal and Bragg diffraction and dye absorption color superposition, thereby realizing the secondary coloring of photonic crystal pigment, overcoming the problem that the color of photonic crystal pigment is easily covered. Because solvent dyes penetrate into the gap layer of photonic crystal pigment, the photonic crystal pigment after secondary coloring not only maintains the characteristics of structural color, but also has stronger covering power and richer multi-angle color.

[0046] Based on the secondary coloring mechanism of the dye bath composition of the present invention (the solvent dye penetrates into the interstitial layer of the photonic crystal pigment to form a more complex superposition of the photonic crystal reflection color and the dye absorption color), the photonic crystal pigment of the present invention is preferably a composition formed by orderly arrangement of nano-microspheres and filling the gaps with acrylic polymers. This type of photonic crystal is mainly composed of microspheres and interstitial layers supporting the microspheres. The microspheres are mainly composed of polystyrene, acrylic, etc., and Bragg diffraction is formed by the orderly arrangement and crystallization of the microspheres to produce color; the interstitial layer used is generally filled with acrylic polymers to maintain the stability of the crystal so that the photonic crystal pigment will not collapse during secondary coloring.

[0047] The photonic crystal pigment of the present invention can be prepared by some public technologies in the art, such as Chinese patent application CN117534796A. Preferably, the nano-microspheres are selected from polymer microspheres, inorganic microspheres and polymer-inorganic composite microspheres, etc.; the polymer microspheres include at least one of polystyrene microspheres and core-shell structure polymer microspheres, and the inorganic microspheres include at least one of silicon dioxide, titanium dioxide, ferroferric oxide and zinc sulfide; the average particle size of the nano-microspheres is 100-400nm, and the polydispersity index PDI is less than 0.15; the acrylate polymer is formed by thermal initiation or photoinitiation polymerization of acrylate selected from at least one of (meth) acrylate monomers and (meth) acrylate oligomers.

[0048] Table 1 Types of raw materials used in Examples 1-5

[0049] Raw material type Material Name Product Model Remark Nonionic surfactants Polyethylene glycol octylphenyl ether X-100 Produced in Hai'an Petrochemical Plant, Jiangsu Province Metal complex dyes Solvent Black 34 B-10 Produced by Nantong Zhengyan New Material Technology Co., Ltd. Anthraquinone dyes Solvent Violet 36 3R GRAN Produced by Germany LANXESS Chemical (China) Co., Ltd. Azo dyes Solvent Red 195 Solvaperm Red G Produced by Clariant Chemicals (China) Co., Ltd. Phthalocyanine dyes Solvent Blue 67 Orasol blue 825 Produced by Titanium Sun New Chemical Materials (Shanghai) Co., Ltd. Photonic crystal pigments Blue-green T80-406 Homemade, D90≤260μm Photonic crystal pigments Gold Red T80-234 Homemade, D90≤270μm Photonic crystal pigments Orange Red T80-134 Homemade, D90≤220μm

[0050] Example 1

[0051] This embodiment provides a secondary coloring method of a photonic crystal pigment, comprising the following steps:

[0052] Step 1: 50 g of water, 48.5 g of propylene glycol methyl ether, 0.5 g of X-100, and 1 g of B-10 are mixed and stirred to dissolve in turn to form a dye bath composition;

[0053] Step 2: heating the dye bath composition to 50°C;

[0054] Step 3: Under high-speed stirring, add 10 g of T80-406 into the dye bath composition of step 2 and perform secondary coloring treatment for 20 minutes;

[0055] Step 4: After step 3 is completed, filter using a 100-mesh filter bag, wash three times with water, and dry at 60° C. for 24 hours to obtain a photonic crystal pigment with black, green, and blue colors.

[0056] Example 2

[0057] This embodiment provides a secondary coloring method of a photonic crystal pigment, comprising the following steps:

[0058] Step 1: 79.4 g of water, 20 g of ethanol, 0.1 g of X-100, and 0.5 g of Solvaperm Red G are sequentially mixed and stirred to dissolve to form a dye bath composition;

[0059] Step 2: maintaining the dye bath composition at a temperature of 25°C;

[0060] Step 3: Under high-speed stirring, add 10 g of T80-406 into the dye bath composition of step 2 and perform secondary coloring treatment for 20 minutes;

[0061] Step 4: After step 3 is completed, filter using a 100-mesh filter bag, wash three times with water, and dry at 60° C. for 24 hours to obtain photonic crystal pigments with red, green, and blue colors.

[0062] Example 3

[0063] This embodiment provides a secondary coloring method of a photonic crystal pigment, comprising the following steps:

[0064] Step 1: 50 g of water, 46.9 g of N-methylpyrrolidone, 0.1 g of X-100, 0.5 g of B-10, and 2.5 g of 3R GRAN are sequentially mixed and stirred to dissolve to form a dye bath composition;

[0065] Step 2: maintaining the dye bath composition at a temperature of 60° C.;

[0066] Step 3: Under high-speed stirring, add 40g of T80-406 into the dye bath composition of step 2 and perform secondary coloring treatment for 20 minutes;

[0067] Step 4: After completing step 3, filter using a 100-mesh filter bag, wash three times with water, and dry at 60° C. for 24 hours to obtain a photonic crystal pigment with black-orange-blue-green colors.

[0068] Example 4

[0069] This embodiment provides a secondary coloring method of a photonic crystal pigment, comprising the following steps:

[0070] Step 1: 20 g of water, 78 g of ethylene glycol, 1 g of X-100, and 1 g of 3R GRAN are sequentially mixed and stirred to dissolve to form a dye bath composition;

[0071] Step 2: heating the dye bath composition to 99°C;

[0072] Step 3: Under high-speed stirring, add 10 g of T80-234 into the dye bath composition of step 2 and perform secondary coloring treatment for 20 minutes;

[0073] Step 4: After step 3 is completed, filter using a 100-mesh filter bag, wash three times with water, and dry at 60° C. for 24 hours to obtain a photonic crystal pigment with purple-red-green colors.

[0074] Example 5

[0075] This embodiment provides a secondary coloring method of a photonic crystal pigment, comprising the following steps:

[0076] Step 1: 50 g of water, 44.9 g of N-methylpyrrolidone, 0.1 g of X-100, and 5 g of Solvaperm Red G are sequentially mixed and stirred to dissolve to form a dye bath composition;

[0077] Step 2: maintaining the dye bath composition at a temperature of 60° C.;

[0078] Step 3: Under high-speed stirring, add 40g of T80-134 into the dye bath composition of step 2 and perform secondary coloring treatment for 20 minutes;

[0079] Step 4: After step 3 is completed, filter using a 100-mesh filter bag, wash three times with water, and dry at 60° C. for 24 hours to obtain a photonic crystal pigment with orange, blue, and green colors.

[0080] Comparative Example 1

[0081] The photonic crystal pigment blue-green T80-406 was prepared by referring to the method described in Example 1 of Chinese patent application CN117534796A, wherein the nano-microspheres used polystyrene microspheres with a particle size of 240nm and a polydispersity index PDI of 0.08. The actual picture of the prepared photonic crystal pigment blue-green T80-406 is as follows Figure 4 shown.

[0082] Comparative Example 2

[0083] The photonic crystal pigment gold red T80-234 was prepared by referring to the method described in Example 1 of Chinese patent application CN117534796A, wherein the nano-microspheres used polystyrene microspheres with a particle size of 250nm and a polydispersity index PDI of 0.08. The actual picture of the prepared photonic crystal pigment gold red T80-234 is as follows Figure 5 shown.

[0084] Comparative Example 3

[0085] The photonic crystal pigment orange red T80-134 was prepared by referring to the method described in Example 1 of Chinese patent application CN117534796A, wherein the nano-microspheres used polystyrene microspheres with a particle size of 260nm and a polydispersity index PDI of 0.1. The actual picture of the prepared photonic crystal pigment orange red T80-134 is as follows Figure 6 shown.

[0086] Comparative Examples 1-3 all prepare photonic crystal pigments by referring to the method described in Example 1 in CN117534796A, wherein the nano-microspheres are all polystyrene microspheres, and photonic crystal pigments of different colors are prepared by adjusting the particle size of the microspheres.

[0087] Test evaluation:

[0088] 1. Add 1 g of the photonic crystal pigment of Example (1-5) and Comparative Example (1-3), 10 g of silica gel main agent (PDMS), and 1 g of silica gel curing agent in a container in sequence, and stir evenly; use a 250 μm film former to apply a film on a test cardboard, heat and cure at 80°C for 10 min; use the visual method to observe the color at multiple angles of 90°, 45°, and 15°.

[0089] Use Sanenchi colorimeter (model: NR60C) to test the Lab value on white cardboard;

[0090] 2. The hiding power test shall refer to GB / T1726-1979 "Determination of hiding power of paint".

[0091] Table 2 Test evaluation results

[0092] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 L 40.8 37.2 37.3 46.1 54.4 92.9 92.9 92.9 a -2.1 63.4 36.3 46.8 19.4 -0.8 0.3 0.1 b -9.1 -5.8 -55 -38.1 -71 2.7 3.1 3.7 90° viewing angle green green green Gold Red Orange Red green Gold Red Orange Red 45° viewing angle blue blue blue green green blue green green 15° viewing angle black red Purple Purple blue colorless colorless colorless <![CDATA[Hiding power g / m 2 > 80 210 320 240 120 470 530 560

[0093] Figure 1 This is a 500-fold microscope image of the black-green-blue photonic crystal pigment prepared in Example 1; Figure 2 This is a 500-fold microscope image of the photonic crystal pigment prepared in Comparative Example 1; Figure 3This is a physical picture of the photonic crystal pigment with black, green and blue colors prepared in Example 1; Figure 4 This is a physical picture of the photonic crystal pigment prepared in Comparative Example 1. Figure 1-Figure 4 As can be seen from the test results in Table 2, in the dye bath composition provided by the present invention, the dissolved dye can penetrate into the gap layer in the presence of water, solvent and surfactant, forming a more complex photonic crystal and Bragg diffraction and dye absorption color superposition, thereby realizing secondary coloring of the photonic crystal pigment; the photonic crystal pigment after secondary coloring by the dye bath composition of the present invention has brighter color and stronger hiding power. Moreover, within the preferred dosage ratio range described in the present invention, the secondary coloring effect of the photonic crystal pigment is better. For example, in Example 1, the color of the photonic crystal pigment after secondary coloring is significantly brighter, and the hiding power of the photonic crystal pigment after secondary coloring is also significantly improved (from 470g / m before secondary coloring). 2 Down to 80g / m 2 ).

[0094] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A dye bath composition for photonic crystal pigments, Features: The invention comprises water, an organic solvent, a surfactant and a solvent dye; the surfactant comprises at least one of an anionic surfactant, a cationic surfactant and a nonionic surfactant.

2. The dye bath composition for photonic crystal pigment according to claim 1, Features: The dye bath composition for photonic crystal pigments comprises the following components in parts by mass: 20-80 parts of water, 20-80 parts of organic solvent, 0.1-1 part of surfactant and 0.1-5 parts of solvent dye.

3. The dye bath composition for photonic crystal pigment according to claim 1 or 2, Features: The surfactant is at least one of an alkylphenol polyoxyethylene ether nonionic surfactant and a fluorocarbon nonionic surfactant.

4. The dye bath composition for photonic crystal pigment according to claim 1, Features: The mass ratio of the solvent dye to the surfactant is greater than 1:

1.

5. The dye bath composition for photonic crystal pigment according to claim 1, Features: The organic solvent includes at least one of ethanol, ethylene glycol, propylene glycol, glycerol, ethylene glycol methyl ether, propylene glycol methyl ether, ethylene glycol butyl ether, dimethylformamide, dimethylacetamide, and N-methylpyrrolidone.

6. The dye bath composition for photonic crystal pigment according to claim 1, Features: The solvent dye includes at least one of metal complex dyes, anthraquinone dyes, azo dyes, phthalocyanine dyes, quinoline dyes, pyrene dyes, cyanine dyes, indigo dyes, nitroso dyes, nitro dyes, sulfur dyes, aromatic methane dyes, quinone imine dyes, hydroxycopper dyes and flavone dyes.

7. A secondary coloring method for photonic crystal pigments, It is characterized in that The method comprises the following steps: controlling the temperature of the dye bath composition for photonic crystal pigments according to any one of claims 1 to 6 to 25-99° C., adding photonic crystal pigments into the dye bath composition for photonic crystal pigments for coloring treatment, and then filtering, washing and drying to complete the secondary coloring treatment of the photonic crystal pigments.

8. The coloring method according to claim 7, Features: The photonic crystal pigment is added to the dye bath composition and subjected to coloring treatment for 20-30 minutes.

9. The coloring method according to claim 7, Features: The photonic crystal pigment is a composition formed by orderly arranging nano-microspheres and filling gaps with acrylic ester polymers.

10. The coloring method according to claim 9, Features: The nano-microspheres are selected from at least one of polymer microspheres, inorganic microspheres and polymer-inorganic composite microspheres; the polymer microspheres include at least one of polystyrene microspheres and core-shell structure polymer microspheres; the inorganic microspheres include at least one of silicon dioxide, titanium dioxide, ferrosoferric oxide and zinc sulfide; The average particle size of the nano-microspheres is 100-400 nm, and the polydispersity index PDI is less than 0.15; The acrylate polymer is polymerized by heat initiation or light initiation through at least one acrylate selected from (meth)acrylate monomers and (meth)acrylate oligomers.

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