Structural color coating composition and preparation method thereof, film and preparation method thereof

Abstract

The invention discloses a structural color coating composition. The structural color coating composition is prepared from the following raw materials in parts by weight: 50 to 80 parts of nano microspheres, 10 to 30 parts of an acrylate composition, 0.5 to 1.5 parts of a photoinitiator and 0.4 to 1.5 parts of a water-based coloring agent. The water-based coloring agent is introduced into the raw materials of the coating composition, so that the angle-dependent heterochromatic effect of the structural color film can be inhibited, and the angle-dependent heterochromatic index is reduced. The water-based coloring agent with the D50 particle size smaller than or equal to 0.45 mu m is introduced, the good light transmittance of the structural color film can be kept, and the haze is low. According to the method, the angle-dependent heterochromatic effect is inhibited, meanwhile, the three-dimensional ordered arrangement of the microspheres is not influenced, and the structural color is not influenced. By adding different colors and different dosages of water-based colorants, the structural color film with coupling effects of different hues, structural colors and absorption colors can be obtained, and the color gamut of the structural color film is greatly widened.

Description

Technical Field

[0001] The present invention relates to the field of compositions of polymer compounds, and particularly to a structural color coating composition and a preparation method thereof, a thin film and a preparation method thereof. Background Art

[0002] The color of a substance includes chemical color and structural color. Structural color is achieved through the internal microstructure of the substance. When the internal microstructure is orderly arranged, diffraction or interference mainly occurs to form structural color. A refractive index difference is formed in the microstructure to obtain a structural color with angle-dependent color change, producing a dazzling effect. The structural color thin film has a clear reflection and transmission spectrum. In some application scenarios, consumers expect to obtain a color effect with high light transmittance and high color purity, but do not want to have the angle-dependent color change effect. Therefore, it is crucial to develop a structural color thin film with high light transmittance, high color purity, and suppressed angle-dependent color change effect.

[0003] Chinese Patent CN116814006A discloses a functional masterbatch and a preparation method and application thereof. The prepared functional masterbatch contains a three-dimensional micro-nano structure of a photonic crystal, which can selectively regulate light at a specific angle and specific wavelength to form a corresponding structural color, and can also obtain different colors to achieve the functions of angle-dependent color change and dynamic color change of the functional masterbatch. However, the angle-dependent color change effect is relatively high, not meeting the requirement of small color change at a low angle. Chinese Patent CN117487402A discloses a structural color ink based on polystyrene particles, a preparation method and an application method thereof. By using emulsion polymerization to prepare polystyrene microspheres, nano-scale regulation can be achieved. Only by changing the dosage of the emulsifier, the particle size of the nano-microspheres can change by 10 - 100 nm to obtain different colors, achieving the preparation of full-spectrum colors with high color saturation and bright colors. However, the prepared structural color ink still has a strong angle-dependent color change property. Summary of the Invention

[0004] In order to develop a structural color thin film with high light transmittance, high color purity, and suppressed angle-dependent color change effect, the first aspect of the present invention provides a structural color coating composition. The preparation raw materials include, by weight: 50 - 80 parts of nano-microspheres, 10 - 30 parts of acrylate composition, 0.5 - 1.5 parts of photoinitiator, and the preparation raw materials also include a water-based colorant.

[0005] During the experiment, the inventor found that adding a water-based colorant to the structural color coating composition can suppress the angle-dependent color effect of the structural color coating and has no effect on the arrangement of the structural color. The reason may be that the water-based colorant can be evenly distributed in the matrix, and the microspheres are not affected by the colorant during the arrangement process and can still form an ordered structure. When the water-based colorant enters the structural color coating, the superposition of the reflected color and the absorbed color occurs, so that at a low viewing angle, the angle-dependent color effect is suppressed, and the color change gap of the structural color coating is small.

[0006] As an embodiment, the addition amount of the water-based colorant is 0.4-1.5 parts by weight.

[0007] As an embodiment, the solubility of the water-based colorant in water at 20°C is ≥5 g / L.

[0008] As an embodiment, the water-based colorant is selected from at least one of water-based polymer dyes, water-soluble azo dyes, water-based nano-color pastes or water-soluble nano-pigments.

[0009] As an embodiment, the D50 particle size of the water-based nano-color paste and the water-soluble nano-pigment is ≤0.45 μm.

[0010] As an embodiment, the model of the water-based colorant includes at least one of TR10164, Red 3855 or Red3630.

[0011] The inventor further found that a structural color coating formed by combining a water-based colorant with a D50 <0.1 μm and the structural color coating composition has high light transmittance and high color purity. Beyond the preferred particle size range, the formed structural color coating will have a problem of fogging, which affects the quality of the structural color coating.

[0012] As an embodiment, the average particle size of the nano-microspheres is 100-400 nm, and the polydispersity index PDI is less than 0.15.

[0013] As an embodiment, the nano-microspheres include at least one of polymer microspheres, inorganic microspheres or polymer-inorganic composite microspheres.

[0014] As an embodiment, the polymer microspheres include at least one of single-material microspheres or core-shell structure polymer microspheres.

[0015] As an embodiment, the single-material microsphere is a polystyrene microsphere.

[0016] As an embodiment, the core material of the core-shell structure polymer microsphere includes at least one of organic or inorganic materials, and the shell material of the core-shell structure polymer microsphere is a polymer elastomer material.

[0017] As an embodiment, the inorganic microspheres include at least one of silica microspheres, titanium dioxide microspheres, magnetite microspheres or zinc sulfide microspheres.

[0018] As an embodiment, the acrylate composition includes an acrylate monomer and an acrylate resin, and the weight ratio of the acrylate monomer to the acrylate resin is (4.2 - 12.5):(4.2 - 12.5).

[0019] As an embodiment, the acrylate monomer includes, but is not limited to, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, n-pentyl (meth)acrylate, neopentyl (meth)acrylate, tert-pentyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, cyclohexyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, hexadecyl (meth)acrylate, octadecyl (meth)acrylate, docosyl (meth)acrylate, norbornene (meth)acrylate, norbornylmethyl (meth)acrylate, isobornyl (meth)acrylate, menthyl (meth)acrylate, octahydroindenyl (meth)acrylate, adamantyl (meth)acrylate, dimethyladamantyl (meth)acrylate, phenyl (meth)acrylate, 2-ethylphenyl (meth)acrylate, indenyl (meth)acrylate, tolyl (meth)acrylate, benzyl (meth)acrylate, acryloylmorpholine, N-hydroxyethylacrylamide, dimethylacrylamide, diethylacrylamide, isopropylacrylamide, N-vinylcaprolactam, (ethoxy)phenol acrylate, benzyl acrylate, tetrahydrofurfuryl acrylate, cyclotrimethylolpropane formal acrylate, 4-tert-butylcyclohexyl acrylate, ethoxyethoxyethyl acrylate, diethoxyphenol acrylate, 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, dipropylene glycol diacrylate, diethylene glycol diacrylate, dipropoxyneopentyl glycol diacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, triethoxytrimethylolpropane triacrylate, hexaethoxytrimethylolpropane triacrylate, nonaethoxytrimethylolpropane triacrylate, pentaethoxytrimethylolpropane triacrylate, tripropoxytrimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate or dipentaerythritol hexaacrylate.

[0020] As an embodiment, the acrylate resin includes, but is not limited to, epoxy acrylate resin, polyurethane acrylate resin, polyester acrylate resin, and silicone acrylate resin.

[0021] As an embodiment, the polyurethane acrylate resin is an aqueous polyurethane acrylate dispersion.

[0022] As an embodiment, the photoinitiator includes at least one of a benzoin alkyl ketone type photoinitiator, an acylphosphine oxide type photoinitiator, a hydrogen abstraction type photoinitiator, or an oxime ester type photoinitiator.

[0023] As an embodiment, the photoinitiator includes at least one of bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoyl phenylphosphonate, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)butan-1-one, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2,4-diethylthioxanthone, or 2-isopropylthioxanthone.

[0024] The second aspect of the present invention provides a method for preparing the above-mentioned structural color coating composition, including the following steps:

[0025] S1: Mix the acrylate composition and the photoinitiator evenly, slowly drop the mixture into the nano-microspheres, and stir evenly.

[0026] S2: Add an aqueous colorant to obtain the structural color coating composition.

[0027] The third aspect of the present invention provides a structural color film, including a plastic substrate layer and a structural color layer, and the plastic substrate layer and the structural color layer are fixedly connected; the structural color layer is prepared by curing the above-mentioned structural color coating composition.

[0028] As an embodiment, the material of the plastic substrate layer includes, but is not limited to, polyethylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol ester, polymethacrylate, polyvinyl alcohol, poly naphthalate, polycarbonate, polyurethane, acrylonitrile-butadiene-styrene copolymer, polyvinyl chloride, polyurethane elastomer, polyvinylidene fluoride, ethylene-vinyl acetate copolymer, polyvinyl butyral, or polyolefin.

[0029] The fourth aspect of the present invention provides a method for preparing a structural color film, including the following steps:

[0030] M1: Prepare a structural color coating composition;

[0031] M2: Coat the structural color coating composition onto a plastic substrate and dry it to obtain a composite film;

[0032] M3: Regularize the composite film so that the nano - microspheres achieve three - dimensional ordered arrangement;

[0033] M4: Photocure the regularized composite film to obtain a structural color film.

[0034] As an embodiment, the coating thickness of the structural color coating composition is 10 - 20 μm.

[0035] As an embodiment, the coating thickness of the structural color coating composition is 15 μm.

[0036] As an embodiment, the drying temperature in step S2 is 70 - 90 °C;

[0037] As an embodiment, the drying temperature in step S2 is 80 °C.

[0038] As an embodiment, after the regularization treatment in step M3, the nano - microspheres achieve three - dimensional ordered arrangement.

[0039] As an embodiment, the light source for photocuring is a 395 nm LED - UV light source.

[0040] As an embodiment, the cumulative light quantity for photocuring is ≥500 mJ / cm 2 .

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) For the structural color coating composition of the present invention, by introducing an aqueous colorant into the raw materials of the coating composition, the angle - dependent color effect of the structural color film can be inhibited, and the angle - dependent color index decreases.

[0043] (2) For the structural color coating composition of the present invention, by introducing an aqueous colorant with a D50 particle size ≤0.45 μm, good light transmittance of the structural color film can be maintained, and the haze is low.

[0044] (3) For the structural color coating composition of the present invention, by introducing 0.4 - 1.5 parts by weight of an aqueous colorant into the raw materials of the coating composition, while inhibiting the angle - dependent color effect, it will not affect the three - dimensional ordered arrangement of the microspheres and will not affect the structural color.

[0045] (4) The structural color coating composition of the present invention can obtain a structural color film with the coupling effect of different hue structural colors and absorption colors by adding aqueous colorants of different colors and different dosages, greatly broadening the color gamut of the structural color film.

[0046] (5) The structural color film prepared from the structural color coating composition of the present invention has excellent light transmittance and the effect of reflecting specific wavelengths, and has a low angle-dependent color difference index, with small color differences at low angles. Description of the Drawings

[0047] Figure 1 Schematic structural diagram of the structural color film prepared in Example 1;

[0048] Figure 2 Multi-angle spectrogram of the structural color film prepared in Example 1;

[0049] Figure 3 Multi-angle spectrogram of the structural color film prepared in Example 6;

[0050] Figure 4 Multi-angle spectrogram of the structural color film prepared in Comparative Example 1;

[0051] Figure 2-4 In the figure: 1. 90° spectrum; 2. 75° spectrum; 3. 60° spectrum; 4. 45° spectrum; 5. 30° spectrum;

[0052] Figure 5 Multi-angle CIE color coordinate diagram of the structural color film prepared in Example 1;

[0053] Figure 6 Multi-angle CIE color coordinate diagram of the structural color film prepared in Comparative Example 1;

[0054] Figure 7 Physical pictures of the structural color films prepared in Example 1 and Comparative Example 1 at 90°; Left: Comparative Example 1; Right: Example 1.

[0055] Figure 8 Physical pictures of the structural color films prepared in Example 1 and Comparative Example 1 at 30°; Left: Comparative Example 1; Right: Example 1. Detailed Embodiments

[0056] Example 1

[0057] A structural color coating composition, the preparation raw materials in parts by weight include: 70 parts of nano-microspheres, 25 parts of acrylate composition, 1 part of photoinitiator, and 0.5 part of aqueous colorant.

[0058] The water-based colorant is a water-based polymer dye, with a solubility in water ≥ 5 g / L at 20 °C, purchased from Zhejiang Caihua Technology Co., Ltd., with the product number TR10164.

[0059] The average particle size of the nano-microspheres is 240 nm, and the polydispersity index PDI is less than 0.15. The nano-microspheres are a PS-PMMA core-shell microsphere emulsion from Zhuhai Guangyu Technology Co., Ltd.

[0060] The acrylate composition includes 1,6-hexanediol diacrylate and a polyurethane acrylate resin, with a weight ratio of 12.5:12.5.

[0061] The polyurethane acrylate resin is a water-based polyurethane acrylate dispersion, purchased from Axalta Coating Systems China Co., Ltd., with the product number Ucecoat 7177.

[0062] The photoinitiator is ethyl 2,4,6-trimethylbenzoyl phenylphosphinate.

[0063] A preparation method of a structural color coating composition includes the following steps:

[0064] S1: Mix the acrylate composition and the photoinitiator evenly, and slowly drop the mixture into the nano-microspheres, then stir evenly;

[0065] S2: Add the water-based colorant to obtain the structural color coating composition.

[0066] A structural color film and its preparation method include the following steps:

[0067] M1: Prepare the structural color coating composition;

[0068] M2: Coat the structural color coating composition onto a plastic substrate, and dry it to obtain a composite film;

[0069] M3: Regularize the composite film;

[0070] M4: Carry out photocuring on the regularized composite film to obtain the structural color film.

[0071] The plastic substrate is a PET film with a thickness of 100 μm, purchased from Hefei Lekai Technology Industry Co., Ltd., with the model FG41S.

[0072] The coating thickness of the structural color coating composition is 15 μm.

[0073] The drying temperature in step S2 is 80 °C.

[0074] The light source for photocuring is a 395 nm LED-UV light source.

[0075] The cumulative light quantity of the photocuring is 1000 mJ / cm 2 .

[0076] The schematic structural diagram of the prepared structural color film is shown in Figure 1 , and the physical picture at 90° is shown in Figure 7 on the right, and the physical picture at 30° is shown in Figure 8 on the right.

[0077] Example 2

[0078] A structural color coating composition, the raw materials for preparation by weight include: 70 parts of nano-microspheres, 25 parts of acrylate composition, 1 part of photoinitiator, and 0.4 part of aqueous colorant.

[0079] The aqueous colorant is an aqueous nano-color paste, and at 20°C, its solubility in water is ≥5 g / L, the D50 particle size is <0.1 μm, it contains 50 wt% of pigment red 112, and it is purchased from BASF SE, Germany, with the product number Dispers Red 3855.

[0080] The average particle size of the nano-microspheres is 240 nm, and the polydispersity index PDI is less than 0.15. The nano-microspheres are PS-PMMA core-shell microsphere emulsions from Zhuhai OptoMagic Technology Co., Ltd.

[0081] The acrylate composition includes 1,6-hexanediol diacrylate and an aqueous polyurethane acrylate dispersion, and the weight ratio is 12.5:12.5.

[0082] The aqueous polyurethane acrylate dispersion is purchased from Axalta Coating Systems (China) Co., Ltd., with the product number Ucecoat7177.

[0083] The photoinitiator is ethyl 2,4,6-trimethylbenzoyl phenylphosphinate.

[0084] A preparation method of a structural color coating composition includes the following steps:

[0085] S1: Mix the acrylate composition and the photoinitiator evenly, slowly drop them into the nano-microspheres, and stir evenly;

[0086] S2: Filter Red 3855 with a 0.1 μm filter and add it to obtain the structural color coating composition.

[0087] A structural color film and its preparation method include the following steps:

[0088] M1: Prepare the structural color coating composition;

[0089] M2: Coat the structural color coating composition on a plastic substrate and dry it to obtain a composite film;

[0090] M3: Regularize the composite film;

[0091] M4: Subject the regularized composite film to photocuring to obtain a structural color film.

[0092] The plastic substrate is a PET film with a thickness of 100 μm, purchased from Hefei Lucky Film Technology Industry Co., Ltd., and the model is FG41S.

[0093] The coating thickness of the structural color coating composition is 15 μm.

[0094] The drying temperature in step S2 is 80 °C.

[0095] The light source for photocuring is a 395 nm LED-UV light source.

[0096] The cumulative light amount for photocuring is 1000 mJ / cm 2 .

[0097] Example 3

[0098] A structural color coating composition, the raw materials for preparation include, by weight: 70 parts of nano-microspheres, 25 parts of acrylate composition, 1 part of photoinitiator, 0.4 part of water-based colorant, and 5 parts of water.

[0099] The water-based colorant is a water-soluble nano-pigment, with a solubility in water ≥ 5 g / L at 20 °C, a D50 particle size < 0.1 μm, containing 50 wt% of pigment red 254, purchased from BASF SE, Germany, and the brand is Red 3630.

[0100] The average particle size of the nano-microspheres is 240 nm, and the polydispersity index PDI is less than 0.15. The nano-microspheres are a PS-PMMA core-shell microsphere emulsion from Zhuhai Guangyu Technology Co., Ltd.

[0101] The acrylate composition includes 1,6-hexanediol diacrylate and an aqueous polyurethane acrylate dispersion, with a weight ratio of 12.5:12.5.

[0102] The aqueous polyurethane acrylate dispersion is purchased from Allnex China Co., Ltd., and the brand is Ucecoat7177.

[0103] The photoinitiator is ethyl 2,4,6-trimethylbenzoyl phenylphosphinate.

[0104] A preparation method of a structural color coating composition, comprising the following steps:

[0105] S1: Mix the acrylate composition and the photoinitiator evenly, slowly drop them into the nano-microspheres, and stir evenly;

[0106] S2: Dissolve Red 3630 in 5 parts of water, filter it with a 0.1 μm filter, and then add it to obtain a structural color coating composition.

[0107] A structural color thin film and a preparation method thereof, comprising the following steps:

[0108] M1: Prepare a structural color coating composition;

[0109] M2: Coat the structural color coating composition onto a plastic substrate and dry it to obtain a composite film;

[0110] M3: Regularize the composite film;

[0111] M4: Carry out photocuring on the regularized composite film to obtain a structural color thin film.

[0112] The plastic substrate is a PET film with a thickness of 100 μm.

[0113] The coating thickness of the structural color coating composition is 15 μm.

[0114] The drying temperature in step S2 is 80 °C.

[0115] The light source for the photocuring is a 395 nm LED-UV light source.

[0116] The cumulative light amount for the photocuring is 1000 mJ / cm 2 .

[0117] Example 4

[0118] A structural color coating composition and a preparation method thereof, a thin film and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the addition amount of the acrylate composition is 24.2 parts by weight, and the acrylate composition includes 1,6-hexanediol diacrylate and an aqueous polyurethane acrylate dispersion, and the weight ratio is 20:4.2.

[0119] The addition amount of the water-based colorant is 1 part by weight.

[0120] Example 5

[0121] A structural color coating composition and a preparation method thereof, a thin film and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the addition amount of the acrylate composition is 24.8 parts by weight, and the acrylate composition includes 1,6-hexanediol diacrylate and an aqueous polyurethane acrylate dispersion, and the weight ratio is 12.3:12.5.

[0122] The addition amount of the water-based colorant is 0.25 part by weight.

[0123] Example 6

[0124] A structural color coating composition and its preparation method, a film and its preparation method. The specific implementation manner is the same as that of Example 1, except that the addition amount of the acrylate composition is 21 parts by weight. The acrylate composition includes 1,6 - hexanediol diacrylate and an aqueous polyurethane acrylate dispersion, and the weight ratio is 8.5:12.5.

[0125] The addition amount of the aqueous colorant is 1 part by weight.

[0126] Example 7

[0127] A structural color coating composition and its preparation method, a film and its preparation method. The specific implementation manner is the same as that of Example 1, except that the addition amount of the aqueous colorant is 1.5 parts by weight.

[0128] Comparative Example 1

[0129] A structural color coating composition and its preparation method, a film and its preparation method. The specific implementation manner is the same as that of Example 1, except that the addition amount of the aqueous colorant is 0 part by weight.

[0130] The physical picture of the prepared structural color film at 90° is shown in Figure 7 on the left, and the physical picture at 30° is shown in Figure 8 on the left.

[0131] Comparative Example 2

[0132] A structural color coating composition and its preparation method, a film and its preparation method. The specific implementation manner is the same as that of Example 1, except that the aqueous colorant has a solubility ≥ 5 g / L in water at 20°C, a D50 particle size < 0.5 μm, contains 50 wt% of Pigment Red 112, and is purchased from Dongguan Dissen New Materials, with the product number GT6350.

[0133] Performance Test

[0134] 1. Transmittance, haze: Use a TH - 100 haze meter to measure the transmittance and haze of the structural color films prepared in the examples and comparative examples. The results are shown in Table 1.

[0135] 2. Reflection wavelength and barrier rate: Measure the corresponding spectral data of the structural color films prepared in Example 1, 6 and Comparative Example 1 at angles of 90°, 75°, 60°, 45°, 30° respectively using a V - 5600PC visible spectrophotometer, and obtain the reflection wavelength and barrier rate. See Figure 2-4 . The results are shown in Table 2.

[0136] 3. Color coordinates and the angle - dependent color difference index:

[0137] 3.1 Color coordinates: Import the spectral data measured by the spectrophotometer at angles of 90°, 75°, 60°, 45°, and 30° into the CIE1931 calculation software to obtain the color coordinates x and y on the CIE; see the test results of Example 1 in Figure 5 , see the test results of Comparative Example 1 in Figure 6 .

[0138] 3.2 Angle-dependent color difference index: Record the color coordinates of the spectral data at a 90° angle on the X-axis and Y-axis as x 2 and y 2 , record the color coordinates of the spectral data at a 30° angle on the X-axis and Y-axis as x 1 and y 1 ; finally, obtain the value of the maximum angle-dependent color difference index according to the calculation formula.

[0139] Calculation formula: The test results are shown in Table 1.

[0140] Table 1

[0141]

[0142]

[0143] As can be seen from the results of the above examples and comparative examples, the structural color films prepared in each example of the present application have excellent light transmittance and the characteristics of reflecting specific wavelengths. In Example 1, an aqueous colorant was added, and the nano-microspheres were dispersed in a matrix with a red colorant. The reflection peak measured by the spectrum was located at 627 nm, indicating that the colorant did not affect the three-dimensional ordered arrangement of the microspheres, and a film with a mixed color phase of structural color and absorption color was obtained. Figure 2 From the spectral diagram of

[0144] Table 2

[0145]

[0146] Example 1 and Example 6 have excellent characteristics of reflecting specific wavelengths, and the blocking rates at each angle are relatively high. The blocking rates at each angle of Comparative Example 1 are not high.

Claims

1. A structural color coating composition, characterized in that: The raw materials include, by weight: 50-80 parts of nano-microspheres, 10-30 parts of acrylate composition, 0.5-1.5 parts of photoinitiator, and the raw materials also include water-based colorant.

2. The structural color coating composition according to claim 1, characterized in that: The amount of the aqueous colorant added is 0.4-1.5 parts by weight.

3. The structural color coating composition according to claim 1, characterized in that: The solubility of the aqueous colorant in water at 20° C. is ≥5 g / L.

4. The structural color coating composition according to claim 1, characterized in that: The water-based colorant includes at least one of a water-based polymer dye, a water-soluble azo dye, a water-based nano-color paste or a water-soluble nano-pigment.

5. The structural color coating composition according to claim 4, characterized in that: The D50 particle size of the water-based nano-color paste and the water-soluble nano-pigment is ≤0.45 μm.

6. The structural color coating composition according to claim 1, characterized in that: The average particle size of the nano-microspheres is 100-400 nm, and the polydispersity index PDI is less than 0.

15.

7. The structural color coating composition according to claim 1, characterized in that: The acrylic acid ester composition comprises acrylic acid ester monomer and acrylic acid ester resin, and the weight ratio of the acrylic acid ester monomer to the acrylic acid ester resin is (4.2-12.5):

1.

8. A method for preparing the structural color coating composition according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: uniformly mix the acrylate composition and the photoinitiator, slowly dropwise add the mixture into the nanospheres, and stir evenly; S2: adding an aqueous colorant to obtain a structural color coating composition.

9. A structural color film, characterized in that: It comprises a plastic substrate layer and a structural color layer, which are fixedly connected; the structural color layer is prepared by curing the structural color coating composition described in any one of embodiments 1 to 7.

10. A method for preparing the structural color film according to claim 9, characterized in that: The following steps are involved: M1: preparing a structural color coating composition; M2: coating the structural color coating composition onto a plastic substrate and drying to obtain a composite film; M3: Regularization of the composite film; M4: Photocuring the composite film after regularization to obtain a structural color film.

Images